Study on microstructure and properties of TIG welded joint for C-276 alloy

SHANG Libao; HUANG Zhongbao; XU Hong

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Study on microstructure and properties of TIG welded joint for C-276 alloy
Vol. 48, Issue 5, Pages: 105-108(2018)
DOI：

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SHANG Libao, HUANG Zhongbao, XU Hong. Study on microstructure and properties of TIG welded joint for C-276 alloy. [J]. 48(5):105-108(2018)
DOI：

SHANG Libao, HUANG Zhongbao, XU Hong. Study on microstructure and properties of TIG welded joint for C-276 alloy. [J]. 48(5):105-108(2018) DOI：

摘要

采用光学显微镜等方法观察C-276合金TIG焊接头显微组织并测试显微硬度,采用电化学技术比较焊缝与母材在酸性和中性环境下的腐蚀性能。结果表明:焊缝为单一奥氏体组织,其形貌为柱状和等轴状;影响区由长大的奥氏体和块状、条状的金属间化合物组成。硬度测试发现,焊缝显微硬度最低,约为260 HV。电化学测试发现,酸性环境中焊缝的耐蚀性弱于母材的,表现为其腐蚀电流密度和腐蚀速率均高于母材;而中性环境中,焊缝的耐蚀性与母材相似。

Abstract

The microstructure characteristics and properties of TIG welded joint of C-276 alloy are studied by OM and other technologies,the corrosion resistance of the weld and base metal in acid and neutral solutions are also investigated. The results show that the microstructure of weld is austenite, and its appearance is columnar and equiaxed. The microstructure of HAZ consists of coarsen austenite and blocky and strip intermetallic compounds. The hardness test shows that the weld microhardness is minimum and about 260 HV. The electrochemical testing indicates that the corrosion resistance of the weld in an acidic environment is weaker than that of the base metal,and the corrosion current density and corrosion rate of the weld are higher than that of the base metal. However, in a neutral environment,the corrosion resistance of the weld is similar to that of the base metal.