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carburizing bearing steels

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001645
EISBN: 978-1-62708-232-7
... are carburized to provide the requisite surface hardness and desirable core properties. Through-hardened material such as SAE-52100 steel has been widely used in European bearing industry, while low-carbon-base carburizing steels such as SAE-8620 gained acceptance in the United States. The advantages...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001796
EISBN: 978-1-62708-241-9
... separation M50 (molybdenum alloy high-speed tool steel) UNS T11350 M50NiL (low-carbon, carburizing bearing steel) UNS K91231 Introduction Tri-lobe cylindrical bearings are often installed on main shafts in relatively small power generator gas turbines to help in combating orbital slippage...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0046371
EISBN: 978-1-62708-234-1
.... The bearing had not seized, and there was no evidence of heat discoloration in the galled areas. The inner cone, made of modified 4720 steel and carburized for wear resistance, rode on an AISI type 630 (17-4 PH) stainless steel spacer. Consequently, it was desirable to determine whether the galled spots...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0047939
EISBN: 978-1-62708-225-9
...Abstract Abstract Rough operation of the roller bearing mounted in an electric motor/gearbox assembly was observed. The bearing components made of low-alloy steel (4620 or 8620) and the cup, cone and rollers were carburized, hardened and tempered. The contact surfaces of these components (cup...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c0047059
EISBN: 978-1-62708-217-4
... acted as a stop-off during carburizing of the offset, circular thrust-bearing surface surrounding the 16-mm (0.637-in.) diam hole. The bearing surface was case hardened to a depth of 0.05 to 0.1 mm (0.002 to 0.005 in.), then austempered to obtain a minimum hardness of 600 Knoop (1-kg, or 2.2-lb, load...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001759
EISBN: 978-1-62708-241-9
... assembly. drive shaft bearing cup brittle fracture heat treatment carbon steel shallow case endurance and load testing fracture toughness SAE-AISI 1117 (11xx resulfurized steel) UNS G11170 Introduction The automobile is a typical industrial product that involves a variety of materials...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001815
EISBN: 978-1-62708-180-1
...; and loose bearings may cause excessive end play and more bending. Gear Materials A variety of cast irons, powder-metallurgy materials, nonferrous alloys, and nonmetallic materials are used in gears, but steels, because of their high strength-to-weight ratio and relatively low cost, are the most...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001741
EISBN: 978-1-62708-234-1
... was designed to handle soft lignite coals but had been used to crush hard deep-mined anthracite coals. Anthracite Crushers Lignite Loads (forces) Taper roller bearings Carburized steel Rolling-contact wear Metallographic evidence of microstructural features in the shape of ‘butterflies’ ( Fig...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0046252
EISBN: 978-1-62708-229-7
... carburization of the piping and bellows. Bellows Expansion joints Sigma phase Weld joints 321 UNS S32100 Intergranular fracture Fatigue fracture A type 321 stainless steel bellows expansion joint on a 17-cm (6 3 4 -in.) OD inlet line in a gas-turbine test facility cracked during...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006792
EISBN: 978-1-62708-295-2
..., this was the cause of the vast majority of bearing failures. Significant improvements in steel cleanliness have been made since the 1960s, which has led to a dramatic increase in RCF life; thus, this failure mode is now rare, as shown in Fig. 1 ( Ref 2 , 3 ). More recently, surface-initiated fatigue—caused...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c0048592
EISBN: 978-1-62708-218-1
..., and screw materials. The bearing caps were made of 1144 steel and had a hardness of 55 HRA. The spider was made of 8620 steel and had been carburized and hardened to 62 to 63 HRC. The screws were made of a steel containing 0.36% C, 1.09% Mn, 0.01% P, 0.17% S, 0.21% Si, 0.01% Ni, and 0.16% Cr, which...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.machtools.c0047964
EISBN: 978-1-62708-223-5
... of a production gearbox had decreased drastically from that normally encountered. The axial load on a bevel gear was taken by a thrust-type roller bearing in which a ground surface on the back of the bevel gear served as a raceway. The gear was made of 8620 steel and was carburized and case hardened to 60 HRC...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001810
EISBN: 978-1-62708-180-1
.... The bearing components were made of a low-alloy steel, such as 4620 or 8620. The cup, cone, and rollers were carburized and hardened and tempered to 59 to 64 HRC. Investigation Visual examination of the cup, cone, and rollers revealed that their contact surfaces were uniformly electrolytically etched...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c9001513
EISBN: 978-1-62708-232-7
...Abstract Abstract While in the stationary mode, capillary action at the contact line between roller and race in a steel rolling mill taper bearing caused a concentration of lubricant and moisture to occur. This lead to lines of corrosion pits at roller intervals. During subsequent operation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.steel.c0046998
EISBN: 978-1-62708-232-7
... (0.120 in.). Failure occurred where the tube passed through the refractory hearth (floor) of the furnace. Although the furnace atmosphere was neutral with respect to the work, it had a carburizing potential relative to the radiant tubes. Analysis (visual inspection, 250x spectroscopic examination...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003510
EISBN: 978-1-62708-180-1
... of dimensional variation and retained austenite content of a bearing steel (100Cr6) as a function of tempering temperature ( Ref 10 ). Tempering may also lead to dimensional variation due to relaxation of residual stresses and plastic deformation, which is due to the temperature dependence of yield strength...
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001092
EISBN: 978-1-62708-214-3
... was in contact with a series of rollers at each end while it was in service. The ends of the shaft were thus bearing surfaces. Pertinent Specifications The specified material was AISI 4320 H steel, case hardened and heat treated to at least 60 HRC to an effective depth of 1.40 to 1.65 mm (0.055 to 0.065...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006757
EISBN: 978-1-62708-295-2
... discharge and arcing through the bearing have produced blue-black oxide, indicating the local heating. The ball bearings also show local hot spots. Fig. 31 Grain-boundary and intragranular precipitation at the hot side of the hot-gas casing of a gas turbine. Material is 321 stainless steel. Etched...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003522
EISBN: 978-1-62708-180-1
... blue-black oxide, indicating the local heating. The ball bearings also show local hot spots. Fig. 31 Grain-boundary and intragranular precipitation at the hot side of the hot-gas casing of a gas turbine. Material is 321 stainless steel. Etched successively in Vilella's reagent, methanolic...
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
... under compressive stress should be beneficial. Recognition of this has resulted in development of such surface treatments as nitriding, carburizing, shot peening, surface rolling, and overstressing. When these treatments are properly applied, the surface is in a state of residual compression. However...