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microstructural investigation

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430351
EISBN: 978-1-62708-253-2
... and post-cold working normalizing heat treatment that resulted in a heterogeneous microstructure with subangular ferrite grains and massive ferrite colonies. Thus, it was a case of tube failure attributed to faulty manufacturing practice. Case Study 36—Failure Investigation of Economizer Coil Tube...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270141
EISBN: 978-1-62708-301-0
...-defined chevron marks along the fracture surface that end in a shear lip on the convex side. Further examination using a SEM shows that the failure was due to overload. Based on these observations and the results of tensile testing and microstructural analysis, investigators concluded that a sudden impact...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430149
EISBN: 978-1-62708-253-2
... rupture, including overheating, high-temperature creep, graphitization, and dissimilar metal welds. It explains how to determine which mechanisms are in play by interpreting fracture patterns and microstructural details. It also describes the investigation of several carbon and low-alloy steel tubes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270124
EISBN: 978-1-62708-301-0
... that a considerable amount of rubbing occurred after the shaft broke. SEM fractography revealed deformation marks and elongated dimples, typical of shear overloads, along with other details. Based on their analysis, investigators concluded that the cardan shaft failed under torsional overload. They also cited a need...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430204
EISBN: 978-1-62708-253-2
...-pearlite structure with microfissures preferentially on pearlite colonies, 200× The investigation revealed that there was considerable degradation of pearlite per SEM and microstructural analysis. This pearlite degradation was due to depletion of carbon from the material, which could possibly...
Image
Published: 01 January 2015
Fig. 15.9 Tensile strength as a function of wire diameter for patented and drawn wires in steels with pearlitic microstructures. Source: Ref 15.30 . References to the investigations noted are given in Ref 15.30 . More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2002
DOI: 10.31399/asm.tb.stg2.t61280357
EISBN: 978-1-62708-267-9
.... A cast nickel-base superalloy containing over 10% W and normal carbon contents displayed no μ or α-tungsten. When the carbon content was lowered without testing or microstructural investigation, property values in production heats began to decline, and excess creep strain was noticed in service...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130241
EISBN: 978-1-62708-284-6
... strength ( R 0.2 ) was determined in conditions of shear bending ( R g0.2 ). For the metallurgical investigations pertaining to surface hardnesses, hardness traverses, layer thickness, and microstructure, the Neophot 30 metallograph and the Zwick microhardness tester were used. Investigation...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270045
EISBN: 978-1-62708-301-0
... in the investigation of two in-flight bombings. aircraft accidents explosive sabotage failure analysis DAMAGE BY EXPLOSIVE SABOTAGE continues to be a serious and increasing threat to structures all over the world. This is particularly true for international targets such as passenger aircraft. As the speed...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270087
EISBN: 978-1-62708-301-0
... of crack initiation could not be established, material defects, improper root loading, and high operating temperatures were ruled out. This chapter describes how investigators came to their conclusions and what they learned through visual and SEM examination and qualitative elemental analysis. It includes...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410315
EISBN: 978-1-62708-265-5
... as a function of wire diameter for patented and drawn pearlitic hypereutectoid steel wires. Source: Ref 15.29 Fig. 15.9 Tensile strength as a function of wire diameter for patented and drawn wires in steels with pearlitic microstructures. Source: Ref 15.30 . References to the investigations noted...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430325
EISBN: 978-1-62708-253-2
... micrograph showing blunt crack tips. Propagation of some of these cracks through the thickness of the tube gives rise to final fracture. Fig. 6.136 (a) SEM image with fatigue striations on the fracture surface of a stainless steel tube, 1000×. (b) Microstructure indicating transgranular cracks...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430290
EISBN: 978-1-62708-253-2
... to penetrate the metal from the gap between fins and external surface of the tube, 200×; (b) microstructure at the OD indicating general form of corrosion as metal dissolution and scale formation on external surface, 200× Investigation established that the failure was largely due to acidic corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.9781627082532
EISBN: 978-1-62708-253-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270191
EISBN: 978-1-62708-301-0
... martensite, compared with a region farther away, which showed well-tempered martensite. The hardness pro les Metallurgical investigations were carried out on six fractured and the corresponding microstructures of the blades are given in blade roots and six fractured airfoil sections from the 19th-stage Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270095
EISBN: 978-1-62708-301-0
... indicating a directional thrust. In addition to their examination, investigators also conducted metallographic studies and hardness tests, which indicated that the balls and inner rings reached temperatures above 825 °C (1520 °F). Based on their findings, investigators concluded that the bearings failed due...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.tb.cub.t66910475
EISBN: 978-1-62708-250-1
... Abstract This chapter discusses the techniques applicable to the diagnosis of corrosion failures, including visual and microscopic examination of corroded surfaces and microstructure; chemical analysis of the metal, corrosion products, and bulk environment; nondestructive evaluation methods...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.tb.tm.t52320001
EISBN: 978-1-62708-357-7
... is recognized as a material , with attributes defined by its microstructure . In the former case, on the other hand, carbon is recognized as matter , and absolutely perfect single crystals are the ideal objects for study because the principal purpose of investigation is the fundamental essence...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430314
EISBN: 978-1-62708-253-2
... be minimized. Case Study 29—Failure Investigation of Low-Temperature Reheater Tube of Middle Bank Coil Background Details The low-temperature reheater (LTRH) tube of a middle bank coil of a coal-fired boiler failed by way of a longitudinal opening after 10 months of service. The MOC of the tube...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.horfi.t51180151
EISBN: 978-1-62708-256-3
... of manufacture of the part under investigation. It can reveal the heat treatment and possible deficiencies in heat treatment such as decarburization at the surface. Microstructural inspection can also reveal possible overheating through coarsening of carbides of superalloys and solution and precipitation...