Effect of heat treatment on corrosion resistance of 1Cr18Ni9Ti and 2Cr13 steel plate welded joint

doi:10.13251/j.issn.0254-6051.2021.03.002

Abstract

Abstract: 1Cr18Ni9Ti and 2Cr13 steel plates were welded by TIG welding with adding welding materials, and post-weld heat treatment was carried out. The welded joint microstructure before and after heat treatment was observed and analyzed by means of SEM. The AC impedance and polarization curves of the welded joint were measured by simulated immersion test. The results show that the welded joint of 1Cr18Ni9Ti and 2Cr13 steel plate before heat treatment is a typical columnar crystal, and the structure is composed of lath martensite+ austenite+ second phase. The microstructure of welded joints after heat treatment is composed of tempered sorbite+ austenite+ second phase. Both the corrosion resistance order of welded joints before or after heat treatment from strong to weak is as follows: austenite base material>heat affected zone near austenite side>welded joint zone>heat affected zone near martensite side>martensite base material. In contrast, the corrosion resistance of martensite base material in the welded joint after heat treatment increases slightly, while the other areas decreases.

Key words: 1Cr18Ni9Ti steel, 2Cr13 steel, welded joint, post-weld heat treatment, corrosion resistance

CLC Number:

TG441.8

Wang Yufeng, Zhao Yongtao, Ma Honghao, Ren Huiping. Effect of heat treatment on corrosion resistance of 1Cr18Ni9Ti and 2Cr13 steel plate welded joint[J]. Heat Treatment of Metals, 2021, 46(3): 7-11.

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