1-20 of 107 Search Results for

etch-attack polishing

Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001683
EISBN: 978-1-62708-234-1
...). The corrosion occurred at welds and consisted of large subsurface void formations with pinhole penetrations of the surfaces. Corrosive attack initiated in the heat affected zones of the welds, usually immediately adjacent to fusion lines. Stepwise grinding, polishing, and etching through the affected areas...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001163
EISBN: 978-1-62708-234-1
... out of the pitted areas. Alternatively polishing and etching micro-sections for viewing at high magnification made crack detail more visible. Optical and scanning electron micrographs showed cracking in austenitic cast steel and cast iron due to both internal tensile and critical residual stresses...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001162
EISBN: 978-1-62708-220-4
... such as electrolytic and hand polishing and the vibration method resulted in poor edge and crack edge definition due to material thickness. Etching experiments involved a grain surface attack and hence produced a rather strong surface relief from which the grain boundary cracks could again not clearly...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c9001250
EISBN: 978-1-62708-223-5
... with 2% nital). 200 × Figure 4 illustrates the structure of a longitudinal microsection through the fracture surface in the vicinity of the cross. The structure on the left side of the picture is finely acicular and was strongly attacked by the etching reagent. Adjacent to this and extending...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... tube produced by erosion-corrosion. The tube surface is clean, the attack having occurred due to brine flowing through it at 70 °C (158 °F) with turbulent flow and an excessive level of dissolved oxygen. Oblique lighting of fracture surfaces for macroscopic examination can be used to advantage...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... ceramic materials) attacks the matrix grains of the ceramic and not the grain-boundary phase ( Fig. 29 ) ( Ref 12 ). Plasma etching is carried out inside a special plasma-etching apparatus, which provides a gaseous mixture of CF 4 and O 2 . A radio-frequency generator emits high-frequency electromagnetic...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001371
EISBN: 978-1-62708-215-0
... contributor to the failure. Fig. 6 Optical micrograph of the typical shaft microstructure, which consisted of tempered lath martensite. Longitudinal view. Etched in Vilella's reagent. 142× Crack Origin/Paths The as-polished microstructure of sample B ( Fig. 7 ), shows intergranular attack...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001704
EISBN: 978-1-62708-218-1
... through typical pitted area, interior tank face is at top Electrolytic oxalic acid etch — original magnification was 4× Fig. 7 Detail of corrosion, showing preferential attack of delta ferrite Same etch as Fig. 6 — original magnification was 50× Similar metallographic examinations were...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001174
EISBN: 978-1-62708-220-4
... be verified most reliably. Fig. 6 Initial cracks in the attacked zone. Etch: nital. 10 × Fig. 7 Structure at the edge of the longitudinal boring in Fig. 5 , showing hydrogen attack. Etch: picral. 100 × Fig. 8 Structure at the edge of the longitudinal boring in Fig. 5 , showing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001409
EISBN: 978-1-62708-229-7
... on the bore, extending from one-half to two-thirds through the tube wall thickness. Fig. 1 Condenser tube affected by dezincification. (×5) The porous nature of the affected portion of the tube is illustrated in Fig. 2 , which shows a section in the “as polished” condition; after etching...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001234
EISBN: 978-1-62708-232-7
... Unetched polished section taken through the point marked in Fig. 2 . 20× The symmetrical location on each side of the point of insertion of the narrower pipe and the localised sharp delineation of the attack indicate erosion due to the formation of turbulence, Turbulence can cause localised rupture...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001410
EISBN: 978-1-62708-220-4
... of the fractures. The microstructure of the unaffected screwed portion of the elbow is depicted in Fig. 3 , and that of the corroded region is shown in Fig. 4 . The attack had selectively removed the dark-etching beta constituent, this being replaced by a deposit of spongy copper. Fig. 2 Dezincified...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001034
EISBN: 978-1-62708-214-3
... Higher-magnification view of edge of pit in the weld area, reflecting preferential interdendritic attack along with the absence of surface etching orother attack on the metal immediately adjacentto the pit. 450×. No evidence of grain-boundary attack or other attack of the base metal immediately...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001224
EISBN: 978-1-62708-232-7
... the sections after the usual etching with V2A-Beize which only attacks the austenitic matrix, were first etched electrolytically in a 1:10 dilution of saturated ammonia water at a terminal voltage of 1.5 V. This served to dissolve the chromium carbide and color it by means of a brown precipitate. Immediately...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001282
EISBN: 978-1-62708-215-0
... Metallography Both components were attacked by corrosion after the surface treatment, though in different forms. Component A, which was in a sensitized condition, underwent intergranular attack. The cooling rate of 120 °C/h (216 °F/h) after the postmachining annealing treatment was not adequate to prevent...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001373
EISBN: 978-1-62708-215-0
... was observed in both valves. In the first valve, the maximum depth of attack was 1.4 mm (0.057 in.) ( Fig. 9 ). Samples from the second valve showed only minute traces of dezincification ( Fig. 10 ). Fig. 9 Dezincification on the inner surface in the neck of the first valve. Etched with NH 4 OH/H 2 O 2...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.design.c0091538
EISBN: 978-1-62708-233-4
... confirmed by microscopic examination of polished-and-etched specimens taken from the cracked regions of several of the retainers. When observed at a magnification of 250×, each of the specimens examined showed an intergranular crack pattern and a microstructure closely resembling that shown in Fig. 1(b...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001390
EISBN: 978-1-62708-215-0
... heaters were polished to diamond finish and etched. Optical microscopic examination revealed a “step structure,” indicating that the material was not sensitized. Crack Origins/Paths Optical microscopic examination of a cracked portion revealed underdeposit attack; that is, corrosion of the sheath...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001085
EISBN: 978-1-62708-214-3
... Crack Origins/Paths The machined section that contained the crack was further cut perpendicular to the long axis of the crack, mounted in epoxy, metallurgically ground and polished, and then etched. Figure 10 is a low-magnification view of the structure revealed by etching. The crack appeared...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001323
EISBN: 978-1-62708-215-0
... The gouging (arrow) observed after the heavy internal deposit was removed by bead blasting from U-bend T2. Fig. 3 Close-up of the hole in tube 4T. Approximately 0.95×. Transverse ring sections were cut from both ends of tubes T2 and T4. Each section was ground, polished, etched, and examined...