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austenitic grain size

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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
... the precipitation (including reduction of carbon content, appropriate heat treatment, cold work of steel, reduction of austenitic grain size and stabilizing elements) were described. The presence of microcracks due to highly localized heat concentrations with consequent thermal expansion and considerable shrinkages...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.rail.c9001531
EISBN: 978-1-62708-231-0
..., and ductility are mainly determined by the carbon content of wheel steels. The fatigue crack growth resistance is insensitive to composition and microstructure, while the fatigue crack initiation life increases with the decrease of austenite grain size and pearlite colony size. The dynamic fracture toughness...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046210
EISBN: 978-1-62708-235-8
... AFNOR 38CD4 (similar to AISI type 4140H) and was in the quenched-and-tempered condition, with a yield strength of about 760 MPa (110 ksi). It was treated to have compressive surface stresses, and the prior-austenite grain size was ASTM 8. Analysis (visual inspection, stress analyses, and macrographs...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001787
EISBN: 978-1-62708-241-9
... to be that of 18CrNi3Mo steel. Investigators also found evidence of inclusions and prior austenite grain size, although it was determined that neither played a role in the failure. Rather, according to test data, the failure occurred because of stress concentration (due to geometric discontinuities along the tooth...
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Published: 30 August 2021
Fig. 9 Austenite grain growth in a fine-grained 0.5% C hypoeutectoid steel (aluminum deoxidized). 0.43C-0.23Si-0.75Mn (wt%). (a) Austenitized for 1 h at 850 °C, cooled at 300 °C/h. Austenite grain size: ASTM No. 7, 180 HV. Picral. 100x. (b) Austenitized for 1 h at 900°C, cooled at 300 °C/h More
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Published: 01 June 2019
Fig. 5 Influence of austenite grain side d γ and pearlite colony size d ρ on fatigue crack initiation life N i More
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Published: 01 January 2002
Fig. 83 Relationship between austenitization processing parameters and grain size for a grain-refined and non-grain-refined AISI 1060 steel. (a) Effect of austenitization temperature and 2 h soaking time. (b) Effect of austenitizing time. Source: Ref 30 More
Image
Published: 01 December 1993
Fig. 13 Microstructure of a vendor B bolt. Structure consists almost entirely of tempered martensite. Prior austenite grain size ASTM 4 and 5. Vilelia etch, 67× More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006816
EISBN: 978-1-62708-329-4
... between austenitic grain size and quench cracking Quench sensitivity Cracking and distortion increase as carbon equivalent (C eq ) is increased. Alloy is crack sensitive if C eq > 0.52, where: C eq = C + Mn 5 + Mo 5 + Cr 10 + Ni 10...
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
... revealing fine details of the matrix structure as well as the crack morphology. Fig. 10 Optical micrographs showing typical lath martensitic structure with grain boundary decohesion at prior austenite grain boundaries (magnification 1000×) In addition to micro-examination, the ASTM grain size...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001800
EISBN: 978-1-62708-241-9
... into the wire, indicating the OD was indeed the fracture origin ( Fig. 2 ). Detailed examination of the origins revealed intergranular fracture between equiaxed, presumably prior austenite, grains that exhibited decreasing grain size inward from the surface ( Fig. 3 ). Fig. 2 SEM image showing...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0045988
EISBN: 978-1-62708-235-8
... specs, but hardness and grain size were different. Reheat treatment of full-width specimens showed that coarse grain size (ASTM 2 to 3) was responsible for the brittle fracture, and excessively high temperature during austenitizing caused the large grain size in the failed strap. The fact...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001026
EISBN: 978-1-62708-214-3
... (such as might exist in a tightly closed crack) and is caused by selective removal and/or redeposition of metal by gas phase reactions with the atmosphere ( Ref 4 , 5 ). Finally, the flakes were similar in size to the apparent as-cast grain structure and were much larger than the austenite grain size produced...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001819
EISBN: 978-1-62708-241-9
.... Figure 2 shows the microstructure of the duplex stainless steel, with austenite delineated in a ferritic matrix, which is in accordance to the NACE/ISO standard [ 1 ]. No σ phase was found through optical microscopy. In Fig. 2 (a) (transverse section image), the average size of the austenitic grains...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001158
EISBN: 978-1-62708-225-9
... by means of shot peening ( Fig. 8 ). The heat treated structure was normal. The austenitic grain size was smaller than group 8 according to Steel-Iron-Test Standard 1510. The surface was decarburized to a depth of approximately 0.03 mm ( Fig. 9 ), lowering the surface hardness (HV 0.1) from 560 to 450 kp...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c9001571
EISBN: 978-1-62708-229-7
... changes. In the base metal, they observed that the prior-austenite grain size begins to coarsen at 1000°C. Fig. 2 Interface microstructure of as-fabricated Midland-1 specimen (Murakami's reagent). Based on these observations, it was concluded [ 5 , 6 ] that specimen F-10 experienced 1040...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001717
EISBN: 978-1-62708-217-4
... that a large austenite grain size is beneficial to toughness when direct rapid quenches from the annealing range is employed 3 . However, this condition is detrimental upon air cooling (as required for this alloy) or intermediate holding 5 . Effect of Grain Size on Resistance to Stress Corrosion Cracking...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003540
EISBN: 978-1-62708-180-1
... by gas carburizing, but several studies have documented bending fatigue crack initiation by IG fracture even in the absence of surface oxidation ( Ref 16 ). It may also be facilitated by the rather large prior austenite grain size resulting from the carburizing cycle. Not only do the fatigue cracks...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001069
EISBN: 978-1-62708-214-3
..., with no significant differences between the affected and unaffected segments. The cladding hardnesses in both segments were similar, 88 to 91 HRB. The hardness of the carbon steel was 82 HRB. Both segments exhibited a nickel-rich intermediate bond layer, 25 mm thick. The austenitic grain size was finer next...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006777
EISBN: 978-1-62708-295-2
... even in the absence of surface oxidation ( Ref 21 ). It may also be facilitated by the rather large prior-austenite grain size resulting from the carburizing cycle. Not only do the fatigue cracks initiate by IG cracking, but the unstable crack also propagates largely by IG fracture until it reaches...