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碳钢表面激光熔覆铝青铜涂层的组织及铜渗透现象

Microstructure and Copper Contamination Phenomenon of Laser Cladded Aluminum Bronze Coatings on Carbon Steel Surface

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摘要

为了提高海洋用钢的表面性能,采用激光熔覆技术在Q235钢板表面熔覆了QAl-7铝青铜合金,并对其组织以及熔合线处的铜渗透现象进行了研究。研究结果表明,铝青铜熔覆层在凝固过程中会发生液相分离以及过饱和脱溶现象,其组织主要由富铜相(Cu3Al、Cu9Al4)以及富铁相(AlFe3、AlFe)构成。熔池中的铜液沿着基体钢奥氏体晶界润湿扩展,在热影响区形成铜渗透现象。铜渗透深度与熔合区的宽度有关,熔合区越宽,铜渗透越深。通过控制激光熔覆工艺参数减少熔合区的宽度进而控制渗透深度,从而抑制铜渗透裂纹的产生。

Abstract

The QAl-7 aluminum bronze powder is cladded on the Q235 carbon steel surface by laser cladding technique in order to improve the surface performances of marine steels. Microstructure and copper contamination phenomenon near the fusion line are also studied. The research results show that the aluminum bronze coating undergoes liquid-phase separation and decomposition of oversaturated solid solution. The microstructure mainly consists of copper-rich phase (Cu3Al, Cu9Al4) and iron-rich phase (AlFe3, AlFe). The liquid copper alloy in the molten pool wets and extends along the austenite grain boundary of the substrates. There occurs the copper contamination phenomenon in the heat-affected zone. The contamination depth of copper alloy is related to the width of fusion zone. The fusion zone is wider, the copper contamination is deeper. Thus, the depth of copper contamination can be controlled just via the reduction of the width of fusion zone by controlling laser parameters. The copper contamination cracks are further suppressed.

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中图分类号:TG17

DOI:10.3788/lop56.051401

所属栏目:激光器与激光光学

基金项目:工信部绿色制造项目

收稿日期:2018-08-07

修改稿日期:2018-09-07

网络出版日期:2018-09-12

作者单位    点击查看

黄湘湘:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240
冯凯:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240
何利杰:中国人民解放军92730部队, 海南 三亚 572000
龚剑:中国人民解放军92730部队, 海南 三亚 572000
陈江:上海大陆激光科技有限公司, 上海 201306
李铸国:上海交通大学上海市激光制造与材料改性重点实验室, 上海 200240

联系人作者:李铸国(lizg@sjtu.edu.cn)

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引用该论文

Huang Xiangxiang,Feng Kai,He Lijie,Gong Jian,Chen Jiang,Li Zhuguo. Microstructure and Copper Contamination Phenomenon of Laser Cladded Aluminum Bronze Coatings on Carbon Steel Surface[J]. Laser & Optoelectronics Progress, 2019, 56(5): 051401

黄湘湘,冯凯,何利杰,龚剑,陈江,李铸国. 碳钢表面激光熔覆铝青铜涂层的组织及铜渗透现象[J]. 激光与光电子学进展, 2019, 56(5): 051401

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