简介概要

Effect of Post-weld Heat Treatment on the Microstructure and Corrosion Resistance of Deposited Metal of a HighChromium Nickel-Based Alloy

来源期刊:Acta Metallurgica Sinica2016年第12期

论文作者:Xin-Jie Di Xiao-Qian Liu Cui-Xin Chen Bao-Sen Wang Xiao-Jiang Guo

文章页码:1136 - 1143

摘    要:The evolution of Cr23C6 carbides in the deposited metal(DM) of a high-chromium nickel-based alloy was investigated after the post-weld heat treatment(PWHT) at 650,750,850,and 950 ℃,respectively.With the increase in temperature,the morphology of the Cr23C6 carbides at the grain boundaries was transformed from the continuous lamellarlike to the semi-continuous rod-like and then to the discontinuous granular.Besides,the needle-like Cr23C6 carbides precipitated from γ matrix after PWHT at 850 ℃.The coarsening kinetics of the needle-like Cr23C6 carbides obeyed the Lifshitz-Slyozov-Wagner law with the growth speed of 4.93 μm3/h in length and 5.56 × 10-3 μm3/h in width.Moreover,the ratio of the carbide length to width increased rapidly at first and then flattened as the holding time increased to 850 ℃.The results of electrochemical corrosion experiment indicated that the needled-like Cr23C6 carbides impaired the corrosion resistance of DM due to the formation of chromium depletion around the carbides.

详情信息展示

Effect of Post-weld Heat Treatment on the Microstructure and Corrosion Resistance of Deposited Metal of a HighChromium Nickel-Based Alloy

Xin-Jie Di1,Xiao-Qian Liu1,Cui-Xin Chen2,Bao-Sen Wang3,Xiao-Jiang Guo4

1. School of Materials Science and Engineering,Tianjin University2. School of Materials Science and Engineering,Hebei University of Technology3. Baosteel Research Institute,Baoshan Iron & Steel Co.,Ltd.4. National Engineering Laboratory of Transportation Safety of Oil & Gas Pipeline

摘 要:The evolution of Cr23C6 carbides in the deposited metal(DM) of a high-chromium nickel-based alloy was investigated after the post-weld heat treatment(PWHT) at 650,750,850,and 950 ℃,respectively.With the increase in temperature,the morphology of the Cr23C6 carbides at the grain boundaries was transformed from the continuous lamellarlike to the semi-continuous rod-like and then to the discontinuous granular.Besides,the needle-like Cr23C6 carbides precipitated from γ matrix after PWHT at 850 ℃.The coarsening kinetics of the needle-like Cr23C6 carbides obeyed the Lifshitz-Slyozov-Wagner law with the growth speed of 4.93 μm3/h in length and 5.56 × 10-3 μm3/h in width.Moreover,the ratio of the carbide length to width increased rapidly at first and then flattened as the holding time increased to 850 ℃.The results of electrochemical corrosion experiment indicated that the needled-like Cr23C6 carbides impaired the corrosion resistance of DM due to the formation of chromium depletion around the carbides.

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