Effects of Laser Processing Parameters on Grain Boundary Character Distribution and Corrosion Resistance of Austenite Stainless Steel

Abstract:

In order to modify grain boundary character distribution (GBCD) and to improve intergranualr corrosion (IGC) resistance of 304 stainless steel, laser surface remelting experiments were conducted on 304 stainless steel using a 2kW CW Nd: YAG laser, and the effects of laser processing parameters on GBCD and corrosion resistance were investigated in detail under the optimal annealing condition (1220K 28h). The experimental results showed that combination of laser surface remelting and the following annealing treatment could change the GBCD remarkably and improve the IGC resistance of 304 stainless steel. However, there are no obvious effects of laser processing parameters on the final depth of the processed zone, although the depth of the molten pool increases with the increase of the laser output power or the decrease of the scanning velocity, and the subsequent GBCD and corrosion resistance.

• Periodical: Materials Science Forum (Volumes 561-565)
• Pages: 2473-2476
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.561-565.2473
• Online since: October 2007
• Authors: Sen Yang, Hiroyuki Kokawa, Zhan Jie Wang
• Keywords: Austenite Stainless Steel, Grain Boundary Engineering, Laser Surface Remelting

References

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[4] S. Yang, Z.J. Wang, H. Kokawa and Y.S. Sat: J Mater Sci. 42(2007), p.847 Fig. 5 Corrosion rate vs duration time under various laser processing parameters.