THE EVALUATION OF DENSIFIED LAYER FORMATION MECHANISMS AND THICKNESS DURING DRY SLIDING WEAR OF POROUS POWDER METALLURGY PARTS

被引：0
|
作者：
Amini, Shaahin [1 ]
Hazeli, Kavan [2 ]
机构：
[1] Univ Calif Riverside, Dept Mech Engn, Riverside, CA 92521 USA
[2] Iran Test & Res Auto Co ITRAC, Tehran, Iran
来源：
TMS 2009 138TH ANNUAL MEETING & EXHIBITION - SUPPLEMENTAL PROCEEDINGS, VOL 3: GENERAL PAPER SELECTIONS | 2009年
关键词：
Powder Metallurgy; Porosity; Hertzian Contact; Subsurface Stresses; Densified Layer;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
When a porous powder metallurgy part is worn by a counterbody, intense shear stresses are exerted on the surface and subsurface owing to the both normal load and tangential load (i.e. friction). Hence, the pores near the surface are closed owing to intense plastic deformation in this area and a hardened densified layer is formed. This densified layer has the thickness in which applied stresses are more than the yield stress of the matrix. In this research a porous Distaloy AE material which is a partially alloyed steel powder was worn by AISI 52100 steel in a reciprocating manner. Then subsurface stresses derived from normal and tangential load were calculated. The thickness of densified layer was obtained by comparing these stresses with yield stress of the matrix. The results compare with the metallographic photos and the differences are discussed.
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页码：347 / +
页数：2
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