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Title: Improvement of fatigue behavior of mechanically surface treated materials by annealing

Abstract

The positive effects of mechanical surface optimization methods for fatigue lifetime and strength are generally attributed to the formation of compressive residual stresses and strain hardening in near surface layers. This work concentrates on the cyclic deformation behavior of three different commercial, widely used alloys (steels SAE 1045 and AISI 304, magnesium wrought alloy AZ31) subjected to thermal treatment after mechanical surface optimization. In the case of SAE 1045 fatigue lifetime as well as fatigue endurance strength were shown to be affected positively by different heat treatments in spite of residual macro and micro stress relaxation. Macroscopically according to Manson-Coffin`s law this improvement can be explained by the reduction of plastic strain amplitude. Microscopically, strain ageing can be identified as the responsible process. For all three materials, optimum heat treatment temperatures and times are suggested, derived from hysteresis measurements and cyclic lifetimes. Finally, it will be shown that further surface optimization can be achieved by simultaneously applying mechanical and thermal treatments (thermomechanical rolling or peening).

Authors:
;  [1]
  1. Univ. Gh Kassel (Germany). Inst. of Materials Technology
Publication Date:
OSTI Identifier:
691362
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 41; Journal Issue: 8; Other Information: PBD: 10 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; FATIGUE; ANNEALING; CARBON STEELS; STAINLESS STEEL-304; MAGNESIUM BASE ALLOYS; SURFACE TREATMENTS; TEMPERATURE DEPENDENCE; STRAIN AGING

Citation Formats

Altenberger, I., and Scholtes, B. Improvement of fatigue behavior of mechanically surface treated materials by annealing. United States: N. p., 1999. Web. doi:10.1016/S1359-6462(99)00222-5.
Altenberger, I., & Scholtes, B. Improvement of fatigue behavior of mechanically surface treated materials by annealing. United States. doi:10.1016/S1359-6462(99)00222-5.
Altenberger, I., and Scholtes, B. Fri . "Improvement of fatigue behavior of mechanically surface treated materials by annealing". United States. doi:10.1016/S1359-6462(99)00222-5.
@article{osti_691362,
title = {Improvement of fatigue behavior of mechanically surface treated materials by annealing},
author = {Altenberger, I. and Scholtes, B.},
abstractNote = {The positive effects of mechanical surface optimization methods for fatigue lifetime and strength are generally attributed to the formation of compressive residual stresses and strain hardening in near surface layers. This work concentrates on the cyclic deformation behavior of three different commercial, widely used alloys (steels SAE 1045 and AISI 304, magnesium wrought alloy AZ31) subjected to thermal treatment after mechanical surface optimization. In the case of SAE 1045 fatigue lifetime as well as fatigue endurance strength were shown to be affected positively by different heat treatments in spite of residual macro and micro stress relaxation. Macroscopically according to Manson-Coffin`s law this improvement can be explained by the reduction of plastic strain amplitude. Microscopically, strain ageing can be identified as the responsible process. For all three materials, optimum heat treatment temperatures and times are suggested, derived from hysteresis measurements and cyclic lifetimes. Finally, it will be shown that further surface optimization can be achieved by simultaneously applying mechanical and thermal treatments (thermomechanical rolling or peening).},
doi = {10.1016/S1359-6462(99)00222-5},
journal = {Scripta Materialia},
number = 8,
volume = 41,
place = {United States},
year = {1999},
month = {9}
}