Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel |
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| Affiliation: | 1. US Naval Research Laboratory, Materials Science and Technology Division, Washington, DC, USA;2. Air Force Institute of Technology, Wright-Patterson AFB, OH, USA;3. Materials Research Centre, University of Wales Swansea, UK;1. Department of Industrial Engineering, University of Trento, Trento, Via Mesiano 77, 38050 Trento, Italy;2. GKN SinterMetals, Brunico, Italy;3. 2Effe Engineering, Soiano del lago, Brescia, Italy;1. School of Mechanical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;2. Department of Materials Engineering, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;3. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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| Abstract: | In this study we have characterized the fatigue behavior of a low-alloy powder metallurgy (P/M) sintered steel, composed mainly of martensite and bainite with 10.4% porosity. After each processing step, the residual axial surface stress was measured by X-ray diffraction. Significant compressive surface stresses were generated during the machining of the fatigue specimens. A heat-treatment at 175 °C after machining had no effect on these residual stresses, but polishing the surface resulted in a 20% reduction in compressive stresses. The residual surface stresses had no apparent effect on the fatigue behavior of the sintered steel. Rather, the fatigue behavior was controlled by sub-surface defects consisting of weakly bonded particles located in regions of high porosity. |
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