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Technical Briefs

Deformation Modes in Stainless Steel During Laser Shock Peening

[+] Author and Article Information
Xiangqun Zhu, Ming Zhou

School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China

Qixun Dai1

School of Materials Science and Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China

Gary J. Cheng2

School of Industrial Engineering, Purdue University, West Lafayette, IN 47906

1

Corresponding author.

2

Corresponding author.

J. Manuf. Sci. Eng 131(5), 054503 (Oct 01, 2009) (4 pages) doi:10.1115/1.4000099 History: Received June 27, 2008; Revised December 15, 2008; Published October 01, 2009

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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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic view of laser shock peening process

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Figure 2

Deformation twins in 304L stainless steel after laser shock peening. (a) TEM picture of deformation twins and corresponding SAED pattern on the corner, and (b) index of SAED pattern.

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Figure 3

Microbands in 304L stainless steel after laser shock peening. (a) TEM picture of microbands and corresponding SAED pattern on the corner, and (b) two types of microbands.

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Figure 4

TEM pictures of mixture of microtwins and microbands in 304L stainless steel after laser shock peening. (a) Microtwins and two microbands with 70 deg; (b) two pairs of parallel microtwin and microbands.

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Figure 5

Snap shot of dislocation multiplication and propagation in fcc metal (304L austenic stainless steel) and formation of microbands along slip planes after laser shock peening (shock pressure: 5.3 GPa, pulse width: 10 ns, stacking fault energy: 21 mJ/m2, shear modulus (G): 73 GPa, density: 8.027 g/cc, and modulus of elasticity (E): 180 GPa)

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