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micropitting

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Published: 01 January 2015
Fig. 21.39 Cracking along 30 and 80 degree bands and formation of micropitting in a carburized steel subjected to contact fatigue testing. Light micrograph, nital etch. Courtesy of T. Ochi, Nippon Steel Company. More
Image
Published: 01 September 2005
Fig. 4 Pitted gear teeth. Note micropitting at the pitch line, scattered macropits, and one area of gross pitting near the left end. More
Image
Published: 01 September 2005
Fig. 13 Gear with micropitting (frosting) failure. Source: Ref 4 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130177
EISBN: 978-1-62708-284-6
..., dimensional stability, and generation of quenching and grinding cracks. They also include insufficient case hardness and improper core hardness, influence of surface carbon content and grain size, internal oxidation, structure of carbides, and inclusion of noncarbide. Details on micropitting, macropitting...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250257
EISBN: 978-1-62708-345-4
... failure analysis. contact fatigue failure analysis fatigue failure gears macropitting micropitting rolling-contact fatigue scuffing spalling stress rupture subcase fatigue thermal fatigue wear GEARS can fail in many different ways, and except for an increase in noise level...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
... fatigue (>1000 cycles to failure) Pitting Initial Superficial Destructive Spalling Micropitting Frosting Gray staining Peeling Subcase fatigue (case crushing) Plowing Adhesion Normal Running-in Mild Moderate Severe Excessive...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
... almost never occurs before 10,000 contacts. Pitting is a fatigue failure where small cracks form in the tooth surface and then grow to the point where small, round bits of metal break out of the tooth surface ( Fig. 4 ). Fig. 4 Pitted gear teeth. Note micropitting at the pitch line, scattered...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250311
EISBN: 978-1-62708-345-4
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390241
EISBN: 978-1-62708-459-8
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410499
EISBN: 978-1-62708-265-5
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630189
EISBN: 978-1-62708-270-9
... Characteristics of contact stress fatigue Characteristic Surface pitting Subsurface pitting Subcase fatigue Location of origin Surface, often at “micropits” Short distance below surface, usually at a nonmetallic inclusion Near case-core boundary in case-hardened parts Initial size Small Small...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2011
DOI: 10.31399/asm.tb.mnm2.t53060385
EISBN: 978-1-62708-261-7
.... Not etched. Original magnification: 60× The type of damage in conventional bearing steels from contact fatigue involves micropitting, macropitting, and spalling ( Fig. 16.10 ). In hybrid ceramics coatings and overlay coatings, the damage typically involves delamination ( Fig. 16.11 ). Factors...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390039
EISBN: 978-1-62708-459-8
... , irrespective of whether the crack originated at the surface or below it. Small-scale surface fatigue is described as micropitting , and is most likely due to fatigue of asperities, although it can be due to chemical effects or electrical arcs as well. When these pits allow escape of the lubricant, a much more...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.9781627084598
EISBN: 978-1-62708-459-8
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2012
DOI: 10.31399/asm.tb.ffub.t53610461
EISBN: 978-1-62708-303-4
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770199
EISBN: 978-1-62708-337-9
... ), taking the onset of gray staining (micropitting) as the failure criterion, determined that initial surface roughness has an effect on surface durability ( Fig. 8.17 ). The tangential load for surface-hardened gear teeth with a surface roughness (R max ) of ~1 μm is about ten times that of teeth where R...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 1999
DOI: 10.31399/asm.tb.cmp.t66770135
EISBN: 978-1-62708-337-9
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390064
EISBN: 978-1-62708-459-8
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 30 September 2023
DOI: 10.31399/asm.tb.stmflw.t59390173
EISBN: 978-1-62708-459-8