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金属基复合材料WC/SS316L超音速激光沉积行为及电化学失效机理

Deposition Behavior and Electrochemical Failure Mechanism of WC/SS316L Metal Matrix Composites Prepared by Supersonic Laser Deposition

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摘要

利用超音速激光沉积技术在316L基体上制备了WC/SS316L复合沉积层, 并分析了该复合沉积层中颗粒的沉积行为、界面结合、组织结构特征以及其在电化学环境下的失效机理。研究结果表明, 由于激光辐照的软化作用, SS316L颗粒在高速撞击过程中表现出较好的塑性变形能力, 能够实现有效沉积; 在激光辐照和高速粒子塑性变形的双重作用下, 超音速激光沉积层较单一冷喷(CS)沉积层具有更好的界面结合行为。由于高速粒子塑性变形产生了加工硬化现象, 沉积层中SS316L的显微硬度较原始粉末的明显增大。在电化学腐蚀环境下, WC/SS316L界面较易发生腐蚀行为。

Abstract

WC/SS316L composite depositon layer was successfully prepared on the 316L substrates by the supersonic laser deposition (SLD) technique. The deposition behavior, interfacial bonding, microstructural characteristics and electrochemical failure mechanism of the particles in these prepared composite depostion layers are analyzed. The results show that, due to the softening effect of laser irradiation, the SS316L particles show an excellent plasticity deformation ability in the high-speed impact process and can be effectively deposited. Under the combined actions of laser irradiation and plasticity deformation of high-speed particles, the SLD layer has a better interfacial bonding behavior than the deposition layer prepared by the cold spray (CS) technique. The micro-hardness of SS316L particles in deposition layers is obviously higher than that of the original powder, which is attributed to the working-hardening produced within plasticity deformation of high-speed particles. Moreover, the WC/SS316L interface is prone to electrochemical failure.

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中图分类号:TN249;TG146.1

DOI:10.3788/cjl201845.0102001

所属栏目:激光制造

基金项目:NSFC-浙江两化融合联合基金(U1509201)、浙江省自然科学基金(LQ17E050009)、浙江省公益技术应用研究项目(2017C31048)、高等学校学科创新引智计划(110000213920168001)

收稿日期:2017-07-07

修改稿日期:2017-09-06

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金琰:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
李波:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
张欣:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
吴丽娟:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
张群莉:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
姚建华:浙江工业大学激光先进制造研究院, 浙江 杭州 310014浙江省高端激光制造装备协同创新中心, 浙江 杭州 310014
刘蓉:浙江工业大学激光先进制造研究院, 浙江 杭州 310014卡尔顿大学机械和航空工程系, 渥太华KIS 5B6, 加拿大

联系人作者:金琰(15968192866@163.com)

备注:金琰(1991-), 男,硕士研究生,主要从事激光复合表面改性技术方面的研究。

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引用该论文

Jin Yan,Li Bo,Zhang Xin,Wu Lijuan,Zhang Qunli,Yao Jianhua,Liu Rong. Deposition Behavior and Electrochemical Failure Mechanism of WC/SS316L Metal Matrix Composites Prepared by Supersonic Laser Deposition[J]. Chinese Journal of Lasers, 2018, 45(1): 0102001

金琰,李波,张欣,吴丽娟,张群莉,姚建华,刘蓉. 金属基复合材料WC/SS316L超音速激光沉积行为及电化学失效机理[J]. 中国激光, 2018, 45(1): 0102001

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