Theoretical and experimental study of the contact fatigue behavior of a Mo-Cu steel produced by powder metallurgy

被引：9
|
作者：
Metinoez, Ibrahim [1 ]
Cristofolini, I. [1 ]
Pahl, W. [2 ]
DeNicolo, A. [2 ]
Marconi, P. [3 ]
Molinari, A. [1 ]
机构：
[1] Univ Trento, Dept Ind Engn, I-38050 Trento, Italy
[2] GKN SinterMet, Brunico, Italy
[3] 2Effe Engn, Brescia, Italy
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 614卷
关键词：
Contact fatigue; Sintered steels; Crack nucleation; Shot peening; SINTERED IRON; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2014.07.009
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A conservative approach to predict the contact fatigue behavior of a Powder Metallurgy steel, in the sinter-hardened condition and after shot peening, was proposed. It is based on the assumption that the contact fatigue crack nucleation is anticipated by the local plastic deformation of the material, which occurs when the maximum local stress exceeds the yield strength of the matrix. A model to predict contact fatigue crack nucleation has been proposed and validated by experiments. A local approach is used, based on the characteristics of the largest pores, which promote fatigue crack nucleation, and on the microhardness of the microstructural constituents where they are localized. Shot peening improves the contact fatigue resistance of the sinterhardened steel by 30%. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：81 / 87
页数：7
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