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Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001312
EISBN: 978-1-62708-170-2
... Abstract Zirconium and hafnium surfaces require cleaning and finishing prior to many processes including joining, heat treating, plating, forming, and final surface finishing. This article provides information on surface treatment processes, surface soil removal, blast cleaning, chemical...
Abstract
Zirconium and hafnium surfaces require cleaning and finishing prior to many processes including joining, heat treating, plating, forming, and final surface finishing. This article provides information on surface treatment processes, surface soil removal, blast cleaning, chemical descaling, pickling or etching, anodizing, autoclaving, polishing, buffing, vapor phase nitriding, and electroplating. It also provides several application examples.
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003247
EISBN: 978-1-62708-199-3
... removed, can obscure the true structure of the specimen being examined. In the traditional method, preparation entails grinding with 400 grit SiC abrasive, rough polishing with 9 μm diamond paste on a napless cloth and 0.3 μm Al 2 O 3 slurry on a medium-nap cloth, and final polishing with colloidal...
Abstract
This article describes the metallographic technique for nonferrous metals and special-purpose alloys. These include aluminum alloys, copper and copper alloys, lead and lead alloys, magnesium alloys, nickel and nickel alloys, magnetic alloys, tin and tin alloys, titanium and titanium alloys, refractory metals and alloys, zinc and zinc alloys, and wrought heat-resisting alloys. The preparation of specimens for metallographic technique includes operations such as sectioning, mounting, grinding, polishing, and etching of nonferrous metals and alloys. The article contains tables that list the etchants for macroscopic examination and microscopic examination of nonferrous metals and special-purpose alloys.
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003244
EISBN: 978-1-62708-199-3
.... Polishing is the final step in producing a deformation-free surface that is flat, scratch-free, and mirror-like in appearance. Such a surface is necessary for subsequent metallographic interpretation, both qualitative and quantitative. The polishing technique used should not introduce extraneous structures...
Abstract
This article describes the methods and equipments involved in the preparation of specimens for examination by light optical microscopy, scanning electron microscopy, electron microprobe analysis for microindentation hardness testing, and for quantification of microstructural parameters, either manually or by the use of image analyzers. Preparation of metallographic specimens generally requires five major operations: sectioning, mounting, grinding, chemical polishing, and etching. The article provides information on the principles of technique selection in mechanical polishing, and describes the procedures, advantages, and disadvantages of electrolytic and chemical polishing. It also provides a detailed account of procedures, precautions, and composition for preparation and handling of etchants.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001237
EISBN: 978-1-62708-170-2
... ceramic materials that are final polished with colloidal silica produce damage-free samples. In the final-polished condition, surface features such as porosity, cracks, inclusions, and other defects can be observed. In most cases, however, an etching step is used to reveal microstructural features such...
Abstract
Quantitative image analysis has expanded the capabilities of surface analysis significantly with the use of computer technology. This article provides an overview of the quantitative image analysis and optical microscopy. It describes the various steps involved in surface preparation of samples prone to abrasion damage and artifacts for quantitative image analysis.
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003245
EISBN: 978-1-62708-199-3
... retaining graphite but suffer from the limitation that they are less efficient in removing abrasion scratches. With two-stage polishing, a napless cloth is used for the rough polishing stage, while a low-nap or napless cloth is used for the final diamond polishing stage. After polishing, the specimen...
Abstract
Proper sectioning of the surface to be examined is a very important step in preparing steel specimens. The first step in preventing damage to the metallurgical structure is to minimize the amount of sectioning that is done. This article discusses the various metallographic techniques, namely mounting, grinding, polishing, and etching involved in the microstructural analysis of carbon and alloy steels, case hardening steels, cast iron, ferrous powder metallurgy alloys, wrought and cast stainless steels, tool materials, steel castings, iron-chromium-nickel heat-resistant casting alloys and different product forms of steels.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001305
EISBN: 978-1-62708-170-2
... types, such as Al 2 O 3 or SiC Grease stick To produce a rough polished finish and to remove imperfections left by hand wheel grinding. Also use as a preparatory operation for a final polish corresponding to standard No. 4 mill finish. This is the usual starting on cold-rolled sheet. Polishing No...
Abstract
Passivation; pickling, that is, acid descaling; electropolishing; and mechanical cleaning are important surface treatments for the successful performance of stainless steel used for piping, pressure vessels, tanks, and machined parts in a wide variety of applications. This article provides an overview of the various types of stainless steels and describes the commonly used cleaning methods, namely, alkaline cleaning, emulsion cleaning, solvent cleaning, vapor degreasing, ultrasonic cleaning, and acid cleaning. Finishing operations of stainless steels, such as grinding, polishing, and buffing, are reviewed. The article also explains the procedures of electrocleaning, electropolishing, electroplating, painting, surface blackening, coloring, terne coatings, and thermal spraying. It includes useful information on the surface modification of stainless steels, namely, ion implantation and laser surface processing. Surface hardening techniques, namely, nitriding, carburizing, boriding, and flame hardening, performed to improve the resistance of stainless steel alloys are also reviewed.
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006684
EISBN: 978-1-62708-213-6
... martensite can be seen in bright field, although rather faintly. Fig. 51 Microstructure of full-annealed Cu-30%Zn etched using Klemm’s I reagent and viewed using (a) bright field, (b) oblique illumination, and (c) Nomarski DIC. Excessive relief was produced during final polishing. Magnification: 15...
Abstract
The reflected light microscope is the most commonly used tool to study the microstructure of metals, composites, ceramics, minerals, and polymers. For the study of the microstructure of metals and alloys, light microscopy is employed in the reflected-light mode using either bright-field illumination, dark-field illumination, polarized light illumination, or differential interference contract, generally by the Nomarski technique. This article concentrates on how to reveal microstructure properly to enable the proper identification of the phases and constituents and, if needed, measuring the amount, size, and spacing of constituents, using the light optical microscope. The discussion covers the examination of microstructures using different illumination methods and includes a comparison between light optical images and scanning electron microscopy images of microstructure.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003214
EISBN: 978-1-62708-199-3
... surfaces from highly smooth initial surfaces. A final finish of less than 0.05 μm can be obtained if the initial surface roughness (root mean square) does not exceed 0.18 to 0.20 μm. Electropolishing was primarily developed for polishing metallurgical specimens and for polishing of irregular shapes that...
Abstract
Finishing refers to a wide variety of processes that generally involve material removal in one form or another to generate surfaces with specific geometries, tolerances, and functional or decorative characteristics. This article discusses four major finishing methods, namely, abrasive machining, electropolishing, mass finishing, and shot peening. In each case, it describes subtypes, process variations, and the associated equipment.
Book Chapter
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001309
EISBN: 978-1-62708-170-2
... Rough polishing Cloth (a) 2100 23 80-grit silicon carbide 29 None or light application of grease stick Final polishing Cloth (a) 2100 30 220-grit Al 2 O 3 49 Grease stick Spot polishing Cloth (a) 2100 46 220-grit Al 2 O 3 77 Grease stick General buffing Spiral-sewn...
Abstract
The selection of surface treatments for copper and copper alloys is generally based on application requirements for appearance and corrosion resistance. This article describes cleaning, finishing, and coating processes for copper and copper alloys. These processes include pickling and bright dipping, abrasive blast cleaning, chemical and electrochemical cleaning, mass finishing, polishing and buffing, electroless plating, immersion plating, electroplating, passivation, coloring, and organic coatings.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001232
EISBN: 978-1-62708-170-2
..., B-2, and B-3 in Fig. 6(b) are less aggressive rough grinding paths that could ensure that wheel topography is not significantly affected during rough grinding, compared to path B-0 in Fig. 6(a) . Hence, all these alternative paths can be accomplished and the part can be ground to final tolerances...
Abstract
Abrasive finishing is a method where a large number of multipoint or random cutting edges are coupled with abrasive grains as a bond or matrix material for effective removal of material at smaller chip sizes. This article provides a broad overview of the various categories of abrasive products and materials, abrasive finishing processes, and the mechanisms of delivering the abrasives to the grinding or machining zone. Abrasive finishing processes, such as grinding, honing, superfinishing, microgrinding, polishing, buffing, and lapping, are discussed. The article presents a brief discussion on abrasive jet machining and ultrasonic machining. It concludes with a discussion on the four categories of factors that affect the abrasive finishing or machining: machine tool, work material, wheel selection, and operational.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001282
EISBN: 978-1-62708-170-2
... melting points can be applied to finally machined, fully heat-treated parts without changing the properties of the part and without thermal distortion of the part. A third advantage is the ability, in most cases, to strip and recoat worn or damaged coatings without changing the properties or dimensions of...
Abstract
This article introduces thermal spray coatings and describes the various types of coating processes and coating devices, including the flame spray, electric-arc spray, plasma spray, transferred plasma arc, high-velocity oxyfuel, and detonation gun. It provides information on the surface preparation methods and finishing treatments of coated parts. The article also explains the tests to evaluate the coating quality and the effects of coating structures and mechanical properties on coated parts. It concludes with a discussion on the uses of thermal spray coatings.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003221
EISBN: 978-1-62708-199-3
... polishing prior to buffing for final finish. In some instances, polishing may be required for removal of burrs, flash, or surface imperfections. Usually, buffing with a sisal wheel prior to final buffing is sufficient. The degree and nature of cleanness required are governed by the subsequent...
Abstract
This article discusses surface engineering of nonferrous metals including aluminum and aluminum alloys, copper and copper alloys, magnesium alloys, nickel and nickel alloys, titanium and titanium alloys, zirconium and hafnium, zinc alloys, and refractory metals and alloys. It describes various techniques to improve functional surface properties and enhance the appearance of product forms. The article discusses various cleaning and finishing techniques such as abrasive blast cleaning, polishing and buffing, barrel burnishing, chemical cleaning, pickling, etching and bright dipping, electrochemical cleaning, mechanical cleaning, and mass finishing. It also examines coating processes such as plating, anodizing, chemical conversion coating, and thermal spray, and concludes with a discussion on oxidation-resistant coatings for refractory metals.
Book Chapter
Book: Fractography
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000606
EISBN: 978-1-62708-181-8
... final fracture occurred. 1.2× Fig. 166 “Cup and cone” tensile fracture of cylindrical test specimen is typical for ductile metals; in this case, annealed AISI 1035. Fracture originates near the center of the section with multiple cracks that join and spread outward. When cracks reach a region...
Abstract
This article is an atlas of fractographs that helps in understanding the causes and mechanisms of fracture of medium-carbon steels and in identifying and interpreting the morphology of fracture surfaces. The fractographs illustrate the torsional-fatigue fracture, cup and cone tensile fracture, brittle fracture, and in-service rotary bending fatigue fracture of fractured roof-truss angles, pressure-vessel shells, automotive axle shafts, broken keyed spindles, crane gears, blooming-mill spindles, automotive bolts, and crane wheels of these steels.
Book Chapter
Book: Fractography
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000611
EISBN: 978-1-62708-181-8
... at B in Fig. 704 . The equiaxed dimples visible here resulted from tension overload during final fracture, but before final shear rupture. 6500× Figures 710 and 711 show the mating segments of a fractured AISI type 501 stainless steel torque cylinder from the hub socket of an aircraft...
Abstract
This article is an atlas of fractographs that helps in understanding the causes and mechanisms of fracture of martensitic stainless steels and in identifying and interpreting the morphology of fracture surfaces. The fractographs illustrate the fracture surface, high-cycle fatigue fracture, tensile-shear fracture, intergranular crack, fatigue striations, and microvoid coalescence of conveyor-chain links, hub socket of aircraft propellers, and automotive intake valves of these steels.
Series: ASM Handbook
Volume: 10
Publisher: ASM International
Published: 15 December 2019
DOI: 10.31399/asm.hb.v10.a0006660
EISBN: 978-1-62708-213-6
... no sample preparation ( Ref 31 ). However, most samples will require some sample preparation. In most cases, standard careful metallographic sectioning and polishing techniques should produce adequate samples for EBSD. The standard preparation steps leading up to the final polishing step include...
Abstract
The electron backscatter diffraction (EBSD) technique has proven to be very useful in the measurement of crystallographic textures, orientation relationships between phases, and both plastic and elastic strains. This article focuses on backscatter diffraction in a scanning electron microscope and describes transmission Kikuchi diffraction. It begins with a discussion on the origins of EBSD and the collection of EBSD patterns. This is followed by sections providing information on EBSD spatial resolution and system operation of EBSD. Various factors pertinent to perform an EBSD experiment are then covered. The article further describes the processes involved in sample preparation that are critical to the success or usefulness of an EBSD experiment. It also discusses the applications of EBSD to bulk samples and the development of EBSD indexing methods.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001314
EISBN: 978-1-62708-170-2
... for heavy welds. The first polishing operation should be done with very fine grit to remove all surface defects and give a base upon which to build the final finish. Wheels of No. 60 to 80 grit are usually required to remove heavy oxide or deep defects. The first operation should be done dry...
Abstract
Nickel alloys can be divided into four groups: high-nickel alloys, nickel-copper alloys, nickel-chromium alloys, and nickel-iron-chromium alloys. Alloys within each composition group that has similar surface conditions are pickled in the same solutions using the same procedures. This article discusses the procedures used for pickling nickel and nickel alloys. It discusses three different surface conditions for pickling these nickel alloys: bright annealed white surface requiring removal of tarnish by flash pickling; bright annealed oxidized surface requiring removal of a layer of reduced oxide, sometimes followed by a flash pickle to brighten; and black or dark-colored surface requiring removal of adherent oxide film or scale. The article also reviews specialized pickling operations of nickel alloys and various cleaning and finishing operations, including grinding, polishing, buffing, brushing, and blasting.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001315
EISBN: 978-1-62708-170-2
... resinate A typical alkaline precleaning cycle may include a 1 to 2 min washing period followed by a 0.5 to 1 min draining period, a 0.5 to 1 min spray-rinse period, and a final 0.5 to 1 min draining period ( Ref 5 ). If a spray alkaline cleaning step does not follow the soak cleaning treatment, the...
Abstract
Zinc and zinc alloys require surface engineering prior to coating or use to improve adhesion and corrosion resistance. Die-cast zinc parts, in addition, must be trimmed and finished to remove flash and parting lines. This article covers zinc cleaning procedures as well as coating and finishing processes. It explains how to remove parting lines and presents several mechanical finishing methods, including surface polishing, brushing, controlled shot peening, and buffing. It also provides information on solvent cleaning, emulsion cleaning, aqueous detergent or alkaline cleaning), electrocleaning, acid dipping, and zinc conversion coating treatments.
Book: Surface Engineering
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001275
EISBN: 978-1-62708-170-2
... coating. In the case of the copper-aluminum alloys cited above, surface pretreatments involving either acid etching ( Ref 4 ) or final polishing in a basic silicate electrolyte ( Ref 7 ) produce a surface that contains a relatively uniform layer of copper, as detected by spatially resolved AES. The...
Abstract
This article briefly describes the basic attributes of chromate conversion coatings and the processes for applying them. It provides information on the influence of substrate microstructure on the performance of coating deposits and on the mechanism of substrate protection supplied by chromate coatings. The article also discusses the development of replacement technologies in response to environmental constraints that have developed around the use of chromium-base compounds.
Book Chapter
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003231
EISBN: 978-1-62708-199-3
... machining or final polishing, or when a surface finish of 3.20 μm (125 μin.) or coarser is allowed, an abrasive cleaning method is frequently a good choice. Generally, chemical cleaning methods have fewer degrading effects on surface finish than mechanical methods (unless the chemical used is strongly...
Abstract
Liquid-penetrant inspection is a nondestructive method used to find discontinuities that are open to the surface of solid, essentially nonporous materials. This article describes the physical principles and the process of liquid-penetrant inspection. It also describes the basic penetrant systems, such as the water-washable system, the post-emulsifiable system, and the solvent-removable system. The article provides information on the liquid-penetrant materials, emulsifiers, solvent cleaners, and developers. It details the equipment requirements, selection of penetrant system, and specifications and standards for the liquid-penetrant inspection.
Book Chapter
Book: Fractography
Series: ASM Handbook
Volume: 12
Publisher: ASM International
Published: 01 January 1987
DOI: 10.31399/asm.hb.v12.a0000603
EISBN: 978-1-62708-181-8
... ductile fracture surface of the test sample after partial fracture at room temperature). Below line is region of quasi-cleavage (the brittle fracture surface of the test sample after final fracture at low temperature). SEM, 30× (R.C. Voigt and L.M. Eldoky, University of Kansas) Fracture transition...
Abstract
This article is an atlas of fractographs that covers pearlitic and ferritic ductile irons. The fractographs display the following: brittle cleavage fracture; fatigue crack propagation; fatigue and monotonic fracture surfaces; fracture modes in slow monotonic loading and impact loading; and microcrack initiation and propagation.