Research on Laser Cladding Processing for 38MnVS6 by PCA-TOPSIS Method

doi:10.3969/j.issn.1000-1093.2019.12.019

Abstract

Abstract: Preparing high performance coating on piston surface by laser cladding is of significance for prolonging the life of diesel engine. In laser cladding process, the selection of appropriate parameters is the key to improve the performance of cladding layer. Whereas the relationship between these factors is non-linear, stochastic and discrete, it is significant to optimize some of them, such as laser power, scanning speed, and powder feed rate. For the laser cladding of nickel-based alloy powder on 38MnVS6 medium carbon steel, L₉(3³) orthogonal array is designed. Taking cladding width, dilution rate and surface hardness as evaluation indicators, the weights of three parameters are obtained by the principal component analysis (PCA). The optimal combination of laser power, scanning speed, and powder feed rate is obtained by the technique for order preference by similarity to ideal solution (TOPSIS) based on Mahalanobis distance. The results show that, when the laser power is 850 W, the scanning speed is 3 mm/s, the powder feed rate is 3.13 g/min, and the coating has the best properties. The dilution rate of cladding layer is decreased by 1.13% and the average hardness of cladding layer is increased by 4.56% compared with those at the scanning speed of 3 mm/s. The range analysis shows that the laser power has the most important effect on the size and overall quality of cladding layer. Key

Key words: lasercladding, laserpower, scanningspeed, powderfeedrate, dilutionrate, principalcomponentanalysis, techniquefororderpreferencebysimilaritytoidealsolution

CLC Number:

TG665

ZHAO Yao, YU Gang, HE Xiuli, LI Haiming, LI Shaoxia. Research on Laser Cladding Processing for 38MnVS6 by PCA-TOPSIS Method[J]. Acta Armamentarii, 2019, 40(12): 2537-2544.

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第40卷
第12期2019 年12月兵工学报ACTA
ARMAMENTARIIVol.40No.12Dec.2019

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