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continuous transverse grain boundaries

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Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001821
EISBN: 978-1-62708-241-9
... large grain structure continuous transverse grain boundaries microstructural analysis ultimate tensile strength A202B (chromium-manganese-silicon alloy steel) Background Failure Investigation of Excess Flow Valves on Stationary Tank BLEVE of Truck-Mounted Tank Discussion of BLEVE...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001171
EISBN: 978-1-62708-219-8
... a continuous path of the sensitized zone at the grain boundaries. It should prevent a continuous penetration path for the corrosive medium 8 . Such a treatment has a limited commercial application. A cold work of the steel before the sensitization The cold work promotes, in fact, the chromium carbide...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001836
EISBN: 978-1-62708-241-9
... to the copper diffusion at the grain boundary during HIB operation at ~980 °C. The copper being a low melting point metal weakens the austenite grains which get disintegrated in the form of transverse cracks due to hot shortness and tensile forces at the bend extrados portion. These small cracks got opened up...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001450
EISBN: 978-1-62708-231-0
.... In the region of the fracture the grain boundaries were delineated as a near-continuous network of cavities and films of oxide. It was evident that the failure of the rivets in service was attributable to intergranular weakness in the material due to gassing. Boilers Gases Arsenical tough-pitch copper...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047756
EISBN: 978-1-62708-235-8
... during torch debrazing or rebrazing were recommended to minimize molten braze metal penetration. Alloying Grain boundaries Waspaloy UNS N07001 Fatigue fracture The inner ring of a spray-manifold assembly fabricated from Waspaloy (AMS 5586) fractured transversely through the manifold tubing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001687
EISBN: 978-1-62708-220-4
... ) to occur by the formation, growth and coalescence of cavities along grain boundaries. These voids increasingly form at the interface between the continuous grain boundary and the matrix during the steady state creep period and at the onset of the tertiary creep, the voids are found to easily joint together...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001837
EISBN: 978-1-62708-241-9
... ) fusion boundary, ( c ) coarse grained HAZ, ( d ) fine grained HAZ, ( e ) intercritical HAZ and ( f ) base metal (magnification 200×) Fig. 8 Optical micrographs of transverse face of cracked specimen showing ( a ) weld zone, ( b ) coarse grained HAZ, ( c ) fine grained HAZ, ( d ) HAZ, ( e ) base...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001665
EISBN: 978-1-62708-231-0
.... It was concluded that some copper was accidentally left in the mold when the casting was poured. Liquid copper, carrying with it oxygen in solution, penetrated the austenite grain boundaries as the steel cooled. The oxygen reacted with the steel producing a network of scale outlining the austenite grain structure...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001304
EISBN: 978-1-62708-215-0
... grain-boundary martensite. The two-pass weld also showed a coarse-grained heat-affected zone (HAZ), with the type 405 stainless steel suggesting a probable drop in ductility in this region. Fig. 8 Representative transverse sections of diffuser exit subassembly (a) Fracture in Corten. (b) Fracture...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006760
EISBN: 978-1-62708-295-2
... stainless steel etched with electrolytic potassium hydroxide During exposure to high temperatures, brittle oxides can form either as a continuous layer on the surface or preferentially along the grain boundaries, where it is called intergranular oxidation ( Fig. 27 ). Fig. 27 (a) Continuous...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.bldgs.c9001715
EISBN: 978-1-62708-219-8
... the pipe during fabrication. Splits often linked together to form transverse cracks in the wire. Figure 6 , shows crack branching near the tip of a large split. The small crack segments, present at the grain boundaries and between pearlite colonies, were a common feature in most samples. In Figure 7...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0047140
EISBN: 978-1-62708-234-1
.... The sleeve cracked from keyway to keyway. Dimensions given in inches. (b) Micrograph of a transverse section through the sleeve showing a continuous network of massive carbide particles at grain boundaries. Etched with a mixture of 2 parts HNO 3 , 2 parts acetic acid, and 3 Examination Conclusion...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001833
EISBN: 978-1-62708-241-9
... of intergranular surface cracks and causes the formation of (Cr,Fe) 23 C 6 carbides along the grain boundaries. Although the mechanical properties of the steam chest material continued to conform to materials specifications and the material remained suitable for continued service, the steam chest may as well...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001778
EISBN: 978-1-62708-241-9
... exhibiting its propagation along the grain boundaries, 1000× Electron probe microanalysis of the transverse sections of all the failed wire samples were also carried out to find existence of any grain-boundary segregation or existence of any harmful trace elements. The analysis showed absence of any...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003553
EISBN: 978-1-62708-180-1
... or incipient cracking. Breaking of a film ahead of an advancing crack permits crack propagation to continue in the metal. Rapid local breaking of the film without particles of film filling the exposed crack is required for rapid crack propagation. Intergranular cracking occurs when grain-boundary regions...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001175
EISBN: 978-1-62708-231-0
... passivity of certain parts of the microstructure, here the grain faces, and a high concentration of corrosion-current at the grain boundaries 2 . These conditions can be encountered in such harmless electrolytes like boiler feed water, when there is a concentration increase or differential aeration...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001775
EISBN: 978-1-62708-241-9
... grain boundaries Fig. 7 The intergranular mode of crack propagation in the alloy Fig. 8 Intergranular propagation and branching of the crack Fig. 9 Transverse section of the tube wall, adjacent to one of the main cracks Energy dispersive analysis by X-ray was focused...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003507
EISBN: 978-1-62708-180-1
... result from postforming processes Process Possible defects Electroplating Hydrogen embrittlement, galvanic corrosion Heat treatment Excessive grain growth, burning of grain boundaries, brittle structure, carburization, decarburization, quench cracks Electrolytic cleaning Pitting...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003544
EISBN: 978-1-62708-180-1
..., followed by the development of cracks at persistent slip bands or at grain boundaries. Subsequently, fatigue cracks propagate by a series of opening and closing motions at the tip of the crack that produce, within the grains, striations that are parallel to the crack front. The process of fatigue...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006825
EISBN: 978-1-62708-329-4
... of pearlite into ferrite and spheroidal carbides ( Fig. 8a ), which weakens the tube material. If continued overheating persists, it can cause formation of voids along grain boundaries ( Fig. 8b ) and eventual grain separation, resulting in stress-rupture failure of the tube. At very high heat fluxes, DNB...