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bainite
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in Failure Analysis of Induction Hardened Automotive Axles
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 19 The onset of bainite shows up as a deep etching structure in axle 2 (nital etch)
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Image
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)
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Book Chapter
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...
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, but investigation (visual inspection, 2% nital etched 8.9x/196x images) showed that the typical core microstructure contained alternating bands of martensite and bainite. The conclusion was that the nonuniform microstructure was likely responsible for the atypical brittle behavior of the blades, and the observed structure suggests that the austempering heat treatment was performed too close to the nominal martensite start temperature. Recommendations included raising the austempering salt-bath temperature 56 deg C (100 deg F) to account for localized compositional variation.
Image
Published: 01 June 2019
Fig. 5 Upper bainitic structure with aligned grains of unresolved pearlite (black). 100 ×
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in Fracture of a Lifting Fork Arm
> ASM Failure Analysis Case Histories: Material Handling Equipment
Published: 01 June 2019
Fig. 2 Coarse bainitic structure of steel in condition as received, etched with Nital. 200 ×
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in The Effects of Sulfide Inclusions on Mechanical Properties and Failures of Steel Components
> Handbook of Case Histories in Failure Analysis
Published: 01 December 2019
Fig. 5 Manganese sulfide inclusions ( arrows ) present in a hardened, bainitic microstructure
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Published: 01 December 1993
Fig. 4 Micrograph showing the bainitic microstructure of the turbine disk. Picral etch. 315×
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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...
Abstract
A recuperator used for preheating the combustion air for a rolling mill furnace failed after a relatively short service time because of leakage of the pipes in the colder part. The 6 % chrome steel pipes used for the warmer part connected by means of welding with austenitic electrodes to the unalloyed mild steel pipe of larger diam. Visual inspection showed corrosion and deep, trench-like erosion over the entire circumference of the seam on the side of the thicker mild steel pipe. Examination using the V2-A solution for picral etch showed the microstructure of the unalloyed pipe had become 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, the failure occurred due to typical contact corrosion wherein the alloyed welding seam represented the less noble electrode. The martensitic structure may have contributed to the failure as well. Due to the typical nature of the failure, no recommendations were made.
Book Chapter
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...
Abstract
Fasteners, made in high-production progressive dies from 0.7 mm thick cold-rolled 1060 steel, were used to secure plastic fabric or webbing to the aluminum framework of outdoor furniture. It was found that approximately 30% of the fasteners cracked and fractured as they were compressed to clamp onto the framework prior to springback. The heat treatment cycle of the fasteners consisted of austenitizing, quenching, tempering to obtain a tempered martensite microstructure, acid cleaning, zinc electroplating, coating with a clear dichromate and thereafter baking to remove the nascent 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 structure and the method of plating the fastener with zinc was changed from electroplating to a mechanical deposition process to thus avoid hydrogen embrittlement.
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...
Abstract
The center portions of two adjacent low-carbon steel boiler tubes (made to ASME SA-192 specifications) ruptured during a start-up period after seven months in service. It was indicated by reports that there had been sufficient water in the boiler two hours before start-up. 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 was disclosed by the wall thickness and OD of the tubing. The tubes were concluded to have failed due to rapid overheating.
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...
Abstract
A forged alloy steel arm of a lifting fork with an approximate cross section of 150 x 240 mm (5.92 x 9.45 in.) fractured after only a short service life on a lift truck. The fracture surface had the appearance of a fracture originating from a surface crack. Analysis (visual inspection, 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 from either improper heat treatment or no heat treatment after the forging operation. The surface cracks in the lifting-fork arm acted as starter notches (stress raisers), assisting in the initiation of fracture. No recommendations were made.
Book Chapter
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...
Abstract
Textile-machine crankshafts forged from 4140 steel fractured transversely on one cheek during one to three years of service. The cause of failure for two forgings (one complete fractured forging and second a section that contained the shorter shaft fracture cheek) was determined. Indication of fatigue failure was revealed by visual examination of the fracture surfaces. Rough grooves from hot trimming of the flash were visible on the surface of the cheeks. The outer face of one cheek of the throw on the forging contained shallow surface folds. Slightly decarburized forged surface 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, the forgings were normalized, hardened and tempered to 28 to 32 HRC before being machined to increase fatigue strength and extremely rough surfaces were removed by careful grinding.
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
... was studied at 4 KHz. Figure 6 demonstrates the change in eddy current response at different locations of the tube. The impedance values are plotted around the circumference of the tube, whereas, each curve has been taken along the tube axis. 28Cr3SiNiWMoV steel is a bainitic steel which during furnace...
Abstract
A deformed steel tube was received for failure analysis after buckling during a heat-treat operation. The tube was subjected to various metallurgical tests as well as nondestructive testing to confirm the presence of residual stresses. The microstructure of the tube was found 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.
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in Working Roll with Shell-Shaped Fractures
> ASM Failure Analysis Case Histories: Steelmaking and Thermal Processing Equipment
Published: 01 June 2019
Fig. 7 Microstructure of roll. Transverse section, etch: Picral, 500× Transition zone (martensite with bainite).
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in Effect of Strain Rate on the Failure Mode of a Rear Axle
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1992
Fig. 9 Microstructure of the axle core, composed of ferrite and pearlite (and perhaps bainite). 2% nital etch. 450×.
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in Metallurgical Analysis of Steam Turbine Rotor Disc
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
Fig. 3 The typical bulk microstructure observed in the disc is shown at two different magnifications. The microstructure consists of tempered martensite and bainite.
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in Corrosion Fatigue and Subsequent Rupture of a Yankee Dryer Roll on a Modified Paper Machine
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1992
Fig. 7 Micrograph of the same area shown in Fig. 6 after etching in nital. Matrix microstructure is bainite with scattered carbides. 64×.
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Image
Published: 01 December 1993
Fig. 5 Microstructure at fracture surface. Arrow A indicates region of tempered martensite. Arrow B indicates mixture of tempered martensite and bainite. Nital etch. 64×
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Published: 01 December 2019
Fig. 9 Sample 3 (area near the fracture/severe oxidation): inner wall on the side of exposure to the hot gas flux. Microstructure: martensite, bainite, and ferrite with carbide precipitation
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in Creep Failure of a Superheater Tube Promoted by Graphitization
> Handbook of Case Histories in Failure Analysis
Published: 01 December 1993
Fig. 4 Microstructure in the remote rings of (a) Tube 3 and (b) Tube 4. The microstructures consist of ferrite and bainite, and the dark spots are graphite. Nital etchant. (a) 308×. (b) 616×.
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