文献类型：期刊文献

英文题名：Porosity, mechanical properties, residual stresses of supersonic plasma-sprayed Ni-based alloy coatings prepared at different powder feed rates

作者：Zhang, X. C.[1,2];Xu, B. S.[3];Wu, Y. X.[2];Xuan, F. Z.[1];Tu, S. T.[1]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200030, Peoples R China;[3]Natl Key Lab Remfg, Beijing 100072, Peoples R China

年份：2008

卷号：254

期号：13

起止页码：3879

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20081511200196);WOS:【SCI-EXPANDED(收录号:WOS:000255344500023)】；

语种：英文

外文关键词：Ni-based alloy coating; powder feed rate; porosity; mechanical properties; residual stress

摘要：The aim of this paper was to investigate the effect of powder feed rate (PFR) on the microstructure and mechanical properties of the supersonic plasma-sprayed Ni-Cr-B-Si-C coatings. The microstructure, porosity and mechanical properties of the coatings and the residual stresses at the coating surfaces were experimentally determined. Results showed that the variations of porosity, elastic moduli and micro-hardness of the coatings followed Weibull distribution. From the statistical trend, the porosity of the coating increased with increasing PFR. However, the elastic modulus and the micro-hardness of the coating decreased and reached local minima and then increased with increasing PFR. Elastic modulus could be generally considered to be an increasing function of micro-hardness. The mean value of the elastic modulus of the coating calculated from Weibull plot was almost proportional to the square root of the mean value of the micro-hardness of the coating. Moreover, with increasing PFR, the residual stress at the coating surface, which was mainly governed by the elastic modulus of the coating, decreased to a local minimum and then increased. (C) 2008 Elsevier B.V. All rights reserved.