Study on microstructure and properties of laser welding joint of CP-Ti

HUANG Zhongbao; WANG Pengfei; SHANG Libao; CHEN Yongliang; LIU Dengbang

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Study on microstructure and properties of laser welding joint of CP-Ti
Vol. 48, Issue 12, Pages: 13-16(2018)
DOI：

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HUANG Zhongbao, WANG Pengfei, SHANG Libao, et al. Study on microstructure and properties of laser welding joint of CP-Ti. [J]. 48(12):13-16(2018)
DOI：

HUANG Zhongbao, WANG Pengfei, SHANG Libao, et al. Study on microstructure and properties of laser welding joint of CP-Ti. [J]. 48(12):13-16(2018) DOI：

摘要

采用光学显微镜等观察和测试CP-Ti激光焊接头组织和硬度,对比接头在酸性、中性和碱性环境中的耐腐蚀性能。结果表明:接头各区域组织均为α相,其中焊缝中的α晶呈针状、锯齿状和板条状3种形貌,在热影响区则为锯齿状。硬度测试表明,焊缝为接头硬度值最高区域,显微硬度达到210 HV,热影响区次之,约为165 HV。接头在酸性环境中的耐蚀性最差,表现为其电流密度、腐蚀速率均高于碱性和中性环境中的。

Abstract

The microstructure and hardness of laser welding joint of CP-Ti are investigated with some technologies,and the corrosion resistance of joint in acid,neutral and alkaline solutions are also studied. The results show that the microstructure of joint consists of αphase,and the α grains in welds have three kinds of appearance,which are acicular,serrated and lath shaped and α grains in heat affected zone（HAZ）are serrated. The hardness test shows that the weld is the area with the maximum joint microhardness of 210 HV,and the microhardness of HAZ is about 165 HV,which is lower than that of weld. The corrosion resistance of joints in acid solution is the worst, the current density and corrosion rate in acid solution are higher than those in neutral and alkaline solutions.