Surface Characterization and Wear Behaviour of Laser Surface Melted AISI 316L Stainless Steel

被引：0
|
作者：
Kumar, A. [1 ]
Pityana, S. [2 ]
Majumdar, J. Dutta [1 ]
机构：
[1] Indian Inst Technol, Dept Met & Mat Engn, Kharagpur 721302, W Bengal, India
[2] CSIR, Natl Laser Ctr, ZA-0001 Pretoria, South Africa
来源：
LASERS IN ENGINEERING | 2013年 / 24卷 / 3-4期
关键词：
AISI 316L stainless steel; Nd:YAG laser; laser surface melting; microstructure; hardness; wear; CORROSION;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The present study concerns an in depth investigation of the influence of laser surface melting of AISI 316L stainless steel using Ar and N-2 as shrouding atmosphere. Laser surface melting has been carried out using a 5 kW continuous wave (CW) fibre optics delivery Nd:YAG laser with a beam diameter of 4 mm. Microstructure of the surface melted layer consists of grain refined austenite when melted in Ar shroud and iron nitrides (Fe4N) and chromium nitrides (Cr2N) dispersed in gamma-Fe matrix when melted in N-2 shroud. Lattice strain and residual stress are also reduced by laser surface melting. The average microhardness of the melt zone increases from 240 VHN (for as-received AISI 316L stainless steel) to 375 VHN and 475 VHN for laser surface melted AISI 316L stainless steel in Ar and N-2 atmosphere, respectively. Fretting wear behaviour against hardened steel ball shows a significant improvement in fretting wear resistance due to laser surface melting with a maximum improvement achieved in N-2 shroud.
引用
收藏
页码：147 / 166
页数：20
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