Microstructure and properties of a Ti doped Fe-based SMA coating produced by laser cladding

被引：19
作者：
Liu, Changyu [1 ]
Xu, Peng [1 ,2 ,3 ]
Zha, Gangqiang [2 ]
Ouyang, Zhi [3 ]
机构：
[1] Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China
[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, MIIT Key Lab Radiat Detect Mat & Devices, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[3] Zhejiang Minglei Tools Ind Co Ltd, Ningbo 315192, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2021年 / 14卷
关键词：
Laser cladding; Shape memory alloy; Strengthening; Microstructure; Wear resistance; IN-SITU SYNTHESIS; RESIDUAL-STRESS; MECHANICAL-PROPERTIES; WEAR BEHAVIOR; ALLOY; STEEL; CO; RECOVERY;
D O I：
10.1016/j.jmrt.2021.07.138
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To improve the microhardness and wear resistance of Fe-based shape memory alloy (SMA), a Ti doped Fe-based SMA coating was prepared on 304 stainless steel by laser cladding. The phase transition temperature, microstructure, phase composition, microhardness, wear and corrosion resistance of the coating were investigated by differential scanning calorimeter, scanning electron microscopy, X-ray diffractometer, microhardness tester, friction tester and electrochemical workstation respectively. The epsilon -> gamma phase transition temperature As and A(f) of the composite coating are 467 and 475 degrees C, respectively. Furthermore, it has a shape recovery rate of 30.98% at a deformation of 8.4%. The coating has stress self-accommodation characteristics and shape memory effect. There are TiC, gamma-austenite and epsilon martensite phase in the SMA thorn Ti coating. The average microhardness of the SMA thorn Ti coating is 1/3 higher than that of the SMA coating, and up to 1/2 compared to the substrate. The friction coefficient of the SMA thorn Ti coating is 1/3 smaller than that of the SMA coating, and 1/2 compared to the substrate. Corrosion resistance of the SMA thorn Ti coating has been improved. (C) 2021 The Author(s). Published by Elsevier B.V.
引用
收藏
页码：2441 / 2450
页数：10
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