Paper Title:
Laser Driven Substructural Modification of Austenitic Stainless Steel
  Abstract

In this paper, the technique of high energy and short pulse duration laser impact is adopted. The substructural transformation characteristics and mechanisms of the austenitic stainless steel, subjected to strain-rate of 106s-1 order and stress of 2.70GPa, are investigated. SEM observations, there exists regular arrangement of chapped and equiaxed subgrain regions within the original grains. The size of the subgrain ranges from 0.1 to 0.5um; Meanwhile, the compacted deformation twin bundles with about 1um width each twin have been examined in the regions treated. It indicates that the equiaxed subgrains, close to nanometer scale, had evolved in the surface of austenitic stainless steel, and they belong to dynamic rotational recrystallization; Although, twinning deformation is not a frequent phenomenon in terms of austenitic stainless steel at room temperature, it will play a significant role when austenitic stainless steels are submitted to high strain rate and stress. Additionally, X-ray diffraction reveals that the crystal lattice constant is up 1.12% compared to the normal one and no deformation-induced α-martensite and amorphous phase are spotted within the processed regions.

  Info
Periodical
Materials Science Forum (Volumes 471-472)
Edited by
Xing Ai, Jianfeng Li and Chuanzhen Huang
Pages
886-890
DOI
10.4028/www.scientific.net/MSF.471-472.886
Citation
M. Zhou, X.Q. Zhu, Q.X. Dai, L. Cai, "Laser Driven Substructural Modification of Austenitic Stainless Steel", Materials Science Forum, Vols. 471-472, pp. 886-890, 2004
Online since
December 2004
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Price
$32.00
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