Title: Influence of rare-earth La₂O₃ on the properties of laser cladding on 316L stainless steel coatings

Authors: Qilin Deng, Anning Xie, Zhijun Ge, Jianli Song

Addresses: School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai, P.R.China. ' School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai, P.R.China. ' School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai, P.R.China. ' School of Mechanical and Power Engineering, Shanghai Jiaotong University, Shanghai, P.R.China

Abstract: The ball valve is an important part of the blast furnace in Shanghai Baosteel. The damage to ball valves is mainly in the spheroids. Laser cladding is a very useful method of repairing the spheroid surface. In this paper, the influences of rare-earth La₂O₃ on the properties of laser cladding on 316L stainless steel coatings have been researched experimentally. From the researches, some results have been obtained. A certain content of rare-earth La₂O₃ can prominently fine and purify the organization of the coatings, suppress the growth of the columnar crystal and dendrite and reduce the interval of grains. Rare-earth La₂O₃ can raise the corrosion-resistant ability of the coatings. The rare-earth La₂O₃ has uniformed the performance of the coatings while improving the hardness of the coatings and the hardness distribution of the coatings tends to be even. The correct rare-earth La₂O₃ content can reduce and eliminate the micro crackles induced by laser cladding.

Keywords: laser cladding; ball valves; rare-earth La₂O₃; spheroids repairing; 316L stainless steel; stainless steel coatings; blast furnace; corrosion protection; hardness.

DOI: 10.1504/IJCAT.2007.015247

International Journal of Computer Applications in Technology, 2007 Vol.29 No.2/3/4, pp.125 - 129

Published online: 30 Sep 2007 *

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