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VACUUM ›› 2020, Vol. 57 ›› Issue (1): 88-93.doi: 10.13385/j.cnki.vacuum.2020.01.16

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Study on Surface Hardness of Plasma Cladding Layer for High Chromium Iron-Based Alloy

YANG Bo, LAI You-bin, WANG Dong-yang, LI Xiang, WU Hai-long, SUN Ming-han,YUAN Ren-yue, SUN Shi-jie   

  1. College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
  • Received:2019-09-10 Online:2020-01-25 Published:2020-03-17

Abstract: In order to investigate the effect of process parameters on the surface microhardness of plasma cladding coatings of high chromium iron-based alloy, a single hard coating of high chromium iron-based alloy coated on Q235 steel was studied, and the quadratic regression orthogonal rotation combination test was carried out. Variance and response surface analysis of test data were performed by using the Design-Expert 8.0.6 analysis software. The mathematical model of various factors and microhardness of coating surface were established, and the influence of working current, powder feeding speed and scanning speed on microhardness of coating surface was explored. According to the extremum theory of multivariate functions, the optimal parameter combination was determined and verified by experiment. The optimal parameter combination obtained by the test were working current of 105A, power feeding speed of 14r/min, scanning speed of 80mm/min, under the conditions, the surface microhardness of the coating reached 1075.03HV, which is about 7. 49 times that of the substrate material. The results may provide a theoretical basis for improving the surface properties of high chromium iron-based hard coatings.

Key words: plasma cladding, microhardness, quadratic regression orthogonal rotational combination test, response surface analysis, optimization test

CLC Number: 

  • TG455
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