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Pitting (wear)

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Image
Published: 01 September 2005
Fig. 45 Pitting and wear pattern on a carburized AMS 6263 steel impeller drive gear. Original magnification approximately 2.3× More
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
... is one of the most effective surface compounds in preventing fretting wear and possible fatigue fracture. Contact-Stress Fatigue Fatigue, in conjunction with wear, can produce cavities, or pits, in either of the two surfaces that contact each other primarily by rolling and/or sliding action...
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630189
EISBN: 978-1-62708-270-9
... of causing gross fractures of parts, only fragments of the surface are removed, at least initially. These fragments, when lost, result in pits or cavities in the surfaces. This type of pitting wear, or contact stress fatigue, frequently is the limiting factor in the component’s load-carrying ability...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250019
EISBN: 978-1-62708-345-4
.... , “Some Factors Influencing the Pitting, Micropitting (Frosted Areas) and Slow Speed Wear of Surface-Hardened Gears,” Paper No. 80-C2/DET-89, American Society of Mechanical Engineers , 1980 , p 1 – 7 11. Shipley E.E. , “Failure Analysis of Coarse-Pitch, Hardened, and Ground Gears,” Paper...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2005
DOI: 10.31399/asm.tb.gmpm.t51250293
EISBN: 978-1-62708-345-4
...Failure modes of gears Table 1 Failure modes of gears Failure mode Type of failure Fatigue Tooth bending, surface contact (pitting or spalling), rolling contact, thermal fatigue Impact Tooth bending, tooth shear, tooth chipping, case crushing, torsional shear Wear Abrasive...
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 mode Type of failure Fatigue Tooth bending, surface contact (pitting or spalling), rolling contact, thermal fatigue Impact Tooth bending, tooth shear, tooth chipping, case crushing, torsional shear Wear Abrasive, adhesive Stress rupture Internal, external List of contact...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420085
EISBN: 978-1-62708-452-9
... Abstract This chapter presents a detailed discussion on the three most frequent gear failure modes. These include tooth bending fatigue, tooth bending impact, and abrasive tooth wear. Tooth bending fatigue includes surface contact fatigue (pitting), rolling contact fatigue, contact fatigue...
Image
Published: 30 November 2013
needed to cause subsurface pitting is shown by the plastic deformation at the sides of the wear track formed by the mating roller, which was 5 in. in diameter More
Image
Published: 01 November 2012
needed to cause subsurface pitting is shown by the plastic deformation at the sides of the wear track formed by the mating roller, which was 125 mm (5 in.) in diameter. Source: Ref 7 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2005
DOI: 10.31399/asm.tb.faesmch.t51270175
EISBN: 978-1-62708-301-0
... units. On disassembly, the plungers in the cylinders were found seized. The damage is attributed to cavitation erosive wear, with corrosion adding to the problem. Background Hydraulic pumps in one type of aircraft failed during service. The damage was severe and hydraulic testing was not possible...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 June 1985
DOI: 10.31399/asm.tb.sagf.t63420185
EISBN: 978-1-62708-452-9
.... Physical Appearance All the teeth were intact and showed very little wear. One side showed a line of fine pits, mostly full-length, very low on the profile. They increased in intensity toward the open end of the teeth, as indicated by heavy pitting and spalling. The opposite sides of the teeth also...
Image
Published: 30 September 2023
Figure 4.7: Illustration of the mechanism of fatigue wear. (a) Original surface subject to periodic loading; (b) accumulation of damage near the surface due to the loading; (c) coalescence of damage and propagation to the surface; (d) development of a wear particle (pitting or spalling). More
Image
Published: 01 March 2001
, and pitting from impressed particles. Damage is almost always more severe than low-stress abrasion. (c) Gouging abrasion where material removal is caused by the action of repetitive compressive loading of hard materials such as rocks against a softer surface, usually a metal. (d) Polishing wear where material More
Series: ASM Technical Books
Publisher: ASM International
Published: 30 November 2013
DOI: 10.31399/asm.tb.uhcf3.t53630211
EISBN: 978-1-62708-270-9
... Abstract This chapter outlines the major types of corrosion, their interactions, their complicating effects on fracture and wear, and some possible prevention methods. The types of corrosion considered in the chapter are galvanic corrosion, uniform corrosion, pitting corrosion, crevice...
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
...%. Contact stress, 400 ksi. Load, 3000 lb. Test No. Specimen No. Test duration R a (a) λ (b) Wear (c) , in. Wear rate (d) Comments 10 6 cycles h Specimen Load roller 1.173 14.7 13.5 3.8 3 10–9/LR 1 1.603 20.2 8.5 ... 0.58 0.0002 12 Surface origin pitting...
Image
Published: 01 December 2003
in fiber-matrix adhesion, and wear thinning of longitudinal fiber. (e) Deep cracks initiating and propagating from fiber to fiber with pits formed due to graphite extraction and fiber consumption, back-transfer of molten polymer from the disc to the pin surface (patches in the left portion More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2015
DOI: 10.31399/asm.tb.cpi2.t55030117
EISBN: 978-1-62708-282-2
... fretting corrosion fretting fatigue cavitation water drop impingement corrosion fatigue MECHANICALLY ASSISTED DEGRADATION of metals is defined as any type of degradation that involves both a corrosion mechanism and a wear or fatigue mechanism. This article discusses five such forms of degradation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350095
EISBN: 978-1-62708-315-7
.... Zinc phosphate coatings can be applied by spray, immersion, or a combination of the two. Coatings can be used for any of the following applications of phosphating: base for paint or oil; aid to cold forming, tube drawing, and wire drawing; increasing wear resistance; or rustproofing. Spray coatings...
Image
Published: 01 June 1985
profile. (e) Lead pattern of loaded side of two random teeth of same gear; result due to abrasive wear. (f) True lead, tooth crowned 0.006 in. per side, which seems abnormally high. More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130111
EISBN: 978-1-62708-284-6
... Abstract This chapter briefly outlines some of the basic aspects of failure analysis, describing some of the basic steps and major concerns in conducting a failure analysis. A brief review of failure types from fracture, distortion, wear-assisted failure, and environmentally assisted failure...