Study on microstructure and properties of a Fe-based SMA/PZT composite coating produced by laser cladding

被引：35

作者：

Liu, Changyu ^{[1
]}

Xu, Peng ^{[1
]}

Zheng, Deyi ^{[1
]}

Liu, Qibin ^{[1
]}

机构：

[1] Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 831卷

基金：

中国国家自然科学基金;

关键词：

Residual stress; Piezoelectric effect; Fe-based shape memory alloy; Wear resistance; Corrosion resistance; SHAPE-MEMORY ALLOYS; RESIDUAL-STRESS; MECHANICAL-PROPERTIES; HEAT DISTRIBUTION; BEHAVIOR; WEAR; PZT; CO; NANOGENERATOR; RESISTANCE;

D O I：

10.1016/j.jallcom.2020.154813

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A Fe-based SMA/PZT (shape memory alloy/lead zirconate titanate piezoelectric ceramics) composite coating was prepared on 304 stainless steel by laser cladding technology, and the coating shows fine metallurgical bonding with the substrate. The microstructure, phase composition, residual stress, microhardness, wear and corrosion resistance of the composite coating were investigated by scanning electron microscopy, X-ray diffractometer, X-ray stress analyzer, microhardness tester, friction tester and electrochemical workstation respectively. The results show that the composite coating is composed of PZT, gamma austenite and an epsilon martensite phase. The microhardness of the composite coating is more than twice as high as that of the SMA coating, and the residual compressive stress of that is more than the SMA coating because of the piezoelectric effect of PZT and the stress self-accommodation characteristic of Fe-based SMA coating. Composite coating shows excellent wear resistance. Its friction coefficient is 1/2 of the SMA coating and 1/3 of the substrate, and its volume wear is only 1/4 of the SMA coating and 1/8 of the substrate, and the corrosion resistance is also improved compared with SMA coating. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：8

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