Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel

J. J. Williams; X. Deng; Nikhilesh Chawla

doi:10.1016/j.ijfatigue.2007.01.008

Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel

J. J. Williams, X. Deng, Nikhilesh Chawla

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

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.

Original language	English (US)
Pages (from-to)	1978-1984
Number of pages	7
Journal	International Journal of Fatigue
Volume	29
Issue number	9-11
DOIs	https://doi.org/10.1016/j.ijfatigue.2007.01.008
State	Published - Sep 2007

Keywords

Fatigue
Machining
Powder metallurgy
Residual stress
Steel

ASJC Scopus subject areas

Modeling and Simulation
General Materials Science
Mechanics of Materials
Mechanical Engineering
Industrial and Manufacturing Engineering

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10.1016/j.ijfatigue.2007.01.008

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title = "Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel",

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.",

keywords = "Fatigue, Machining, Powder metallurgy, Residual stress, Steel",

author = "Williams, {J. J.} and X. Deng and Nikhilesh Chawla",

note = "Funding Information: The authors gratefully acknowledge Hoeganaes Corporation (Dr. K.S. Narasimhan) for providing the samples and financial support of this research.",

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AU - Williams, J. J.

AU - Deng, X.

AU - Chawla, Nikhilesh

N1 - Funding Information: The authors gratefully acknowledge Hoeganaes Corporation (Dr. K.S. Narasimhan) for providing the samples and financial support of this research.

PY - 2007/9

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N2 - 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.

AB - 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.

KW - Fatigue

KW - Machining

KW - Powder metallurgy

KW - Residual stress

KW - Steel

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Effect of residual surface stress on the fatigue behavior of a low-alloy powder metallurgy steel

Abstract

Keywords

ASJC Scopus subject areas

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