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bainite

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Published: 01 December 2019
Fig. 19 The onset of bainite shows up as a deep etching structure in axle 2 (nital etch) More
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Published: 01 December 2019
Fig. 3 ( a , b ) Optical micrograph of failed socket showing bainite phase ( a ) as compared with that of a better quality unfailed socket showing martensite phase ( b ) at the same magnification (Etchant: 2% Nital) More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0090959
EISBN: 978-1-62708-222-8
... Abstract Mower blades manufactured from grade 1566 high-manganese carbon steel failed a standard 90 deg test. The blades had been austempered and reportedly fractured in a brittle manner during testing. The austempering treatment was intended to produce a bainitic microstructure...
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Published: 01 January 2002
Fig. 26 Debonding at the interface of a carbide particle and the matrix in a bainitic 4150 steel. Loading direction indicated. Source: Ref 42 More
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Published: 01 January 2002
Fig. 10 Debonding associated with a MnS inclusion in a bainitic microstructure. Loading direction indicated. Source: Ref 30 More
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Published: 01 December 1993
Fig. 4 Micrograph showing the bainitic microstructure of the turbine disk. Picral etch. 315× More
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Published: 15 January 2021
Fig. 27 Debonding at the interface of a carbide particle and the matrix in a bainitic 4150 steel. Loading direction indicated. Source: Ref 18 More
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Published: 15 January 2021
Fig. 10 Debonding associated with a MnS inclusion in a bainitic microstructure. Loading direction indicated. Source: Ref 30 More
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Published: 01 June 2019
Fig. 5 Upper bainitic structure with aligned grains of unresolved pearlite (black). 100 × More
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Published: 01 June 2019
Fig. 2 Coarse bainitic structure of steel in condition as received, etched with Nital. 200 × More
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Published: 01 December 2019
Fig. 5 Manganese sulfide inclusions ( arrows ) present in a hardened, bainitic microstructure More
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Published: 01 January 2002
Fig. 31 Radial marks on tensile test specimen of Society of Automotive Engineers (SAE) 4150 steel isothermally transformed to bainite, quenched to room temperature, and then tempered. (a) Lower bainite, isothermally transformed at 300 °C (570 °F) for 1 h, tempered at 600 °C (1110 °F) for 48 h More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0047830
EISBN: 978-1-62708-235-8
... was identified around one of the folds and a fatigue crack initiated in the fold and propagated across the cheek. Properties representative of 4140 steel, quenched and tempered to a hardness of 20 to 22 HRC, were observed. Tempered bainite was revealed in the general microstructure. As a corrective measure...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.homegoods.c0048674
EISBN: 978-1-62708-222-8
... hydrogen. It was revealed that fasteners treated in this manner were brittle due to hydrogen embrittlement as the baking process was found to not be able to remove all the nascent hydrogen which had induced during acid cleaning and electroplating. The heat treatment cycle was modified to produce a bainitic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.matlhand.c9001196
EISBN: 978-1-62708-224-2
..., 200x micrographs, chemical analysis, and metallographic examination) supported the conclusion that the primary cause of the failure was the brittleness (lack of impact toughness) of the steel. The coarse bainitic microstructure was inadequate for the service application. The microstructure resulted...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001159
EISBN: 978-1-62708-232-7
... coarse-grained and acicular, and the microstructure of the welding seam had become predominantly martensitic as a result of the mixing of the weld metal with the fused pipe material. The chrome steel pipe had become partially transformed to martensite or bainite at the transition to the weld. Thus...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048289
EISBN: 978-1-62708-234-1
.... The microstructure near the rupture edge was revealed by metallographic examination to consist of ferrite and acicular martensite or bainite. The microstructure and the observed lack of cold work indicated a temperature above the transformation temperature of 727 deg C had been reached. Swelling of the tubes...
Image
Published: 15 January 2021
Fig. 31 Radial marks on tensile test specimen of SAE 4150 alloy steel isothermally transformed to bainite, quenched to room temperature, and tempered. (a) Lower bainite, isothermally transformed at 300 °C (570 °F) for 1 h, tempered at 600 °C (1110 °F) for 48 h. (b) Lower bainite, isothermally More
Image
Published: 30 August 2021
Fig. 14 Microstructure of failed reheater tube. (a) At away location showing equiaxed grains of ferrite with partially degraded pearlite/bainite. (b) At rupture showing degraded bainite along the grain boundaries of elongated ferrite and within the grains. Original magnification: 400× More
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001811
EISBN: 978-1-62708-241-9
... to be homogenous and had no banded structure. However, x-ray diffraction analysis confirmed the presence of up to 6% retained austenite which likely caused the tube to buckle during the 910 °C heat treating procedure. tube buckling retained austenite bainitic steel distortion x-ray diffraction analysis...