In order to study the deformation mechanisms during ultrahigh strain rate deformation of face centered cubic metals, laser shock peening of a 304L stainless steel is systematically investigated. Two deformation modes—microtwins and microbands—and their interrelationship during high strain rate deformation are discussed in detail. Transmission electron microscopy and selected area electron diffraction are employed to study the deformation modes. It is found that twinning takes place even when the shock pressure is much less than the critical twinning stress in stainless steels. Theoretical critical twinning stress is not the only criteria to decide the deformation modes of twinning or slip. The formation of twinning and slip can be affected by the factors such as loading profile, loading stress/strain rate, stacking fault energy, grain sizes, and cell substructures. Factors that influence twin-slip transition in shock loading are discussed. The formation of dislocation structure is compared with those predicted using 3D dislocation dynamic simulation.
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October 2009
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Deformation Modes in Stainless Steel During Laser Shock Peening
Xiangqun Zhu,
Xiangqun Zhu
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
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Ming Zhou,
Ming Zhou
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
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Qixun Dai,
Qixun Dai
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
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Gary J. Cheng
Gary J. Cheng
School of Industrial Engineering,
Purdue University
, West Lafayette, IN 47906
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Xiangqun Zhu
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
Ming Zhou
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
Qixun Dai
School of Materials Science and Engineering,
Jiangsu University
, Zhenjiang, Jiangsu 212013, China
Gary J. Cheng
School of Industrial Engineering,
Purdue University
, West Lafayette, IN 47906J. Manuf. Sci. Eng. Oct 2009, 131(5): 054503 (4 pages)
Published Online: October 1, 2009
Article history
Received:
June 27, 2008
Revised:
December 15, 2008
Published:
October 1, 2009
Citation
Zhu, X., Zhou, M., Dai, Q., and Cheng, G. J. (October 1, 2009). "Deformation Modes in Stainless Steel During Laser Shock Peening." ASME. J. Manuf. Sci. Eng. October 2009; 131(5): 054503. https://doi.org/10.1115/1.4000099
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