Reactive gas shielding during laser surface alloying for production of hard coatings

被引：28
作者：
Babu, SS
Kelly, SM
Murugananth, M
Martukanitz, RP
机构：
[1] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA
[2] Penn State Univ, Appl Res Lab, University Pk, PA 16802 USA
[3] Nanyang Technol Univ, Sch Mat Engn, Singapore, Singapore
来源：
SURFACE & COATINGS TECHNOLOGY | 2006年 / 200卷 / 08期
关键词：
hardness testing; laser melting; iron alloys; reactive gas shielding;
D O I：
10.1016/j.surfcoat.2005.02.160
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The effects of nitrogen addition to shielding gas during laser surface alloying with a mixture of 80 wt.% 431-type stainless steel and 20 wt.% titanium carbide powders were investigated. Microstructural characterization of the laser deposits indicated that titanium carbide melted and re-precipitated as fine carbides from the liquid melt during cooling. With 100% nitrogen shielding and the same powder mixtures, a deposition with increased hardness was obtained. The microstructural evolution in the deposit was calculated with equilibrium thermodynamic calculations. Published by Elsevier B.V.
引用
收藏
页码：2663 / 2671
页数：9
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