Effect of Surface Decarburization on Corrosion Behavior of GH3535 Alloy in Molten Fluoride Salts

作     者：Juan Hou Fen-Fen Han Xiang-Xi Ye Bin Leng Min Liu Yan-Ling Lu Xing-Tai Zhou 

作者机构：Center for Thorium Molten Salts Reactor System Shanghai Institute of Applied Physics Chinese Academy of Sciences 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2019年第32卷第3期

页      面：401-412页

核心收录：

学科分类：082703[工学-核技术及应用] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 08[工学] 0807[工学-动力工程及工程热物理] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 0802[工学-机械工程] 0703[理学-化学] 0811[工学-控制科学与工程] 

基　　金：supported financially by the National Natural Science Foundation of China (Nos. 51601214, 51674237 and 11705264) the National Key Research and Development Program (No. 2017YFA0402803) 

主　　题：Molten salt Corrosion Ni-based superalloys Decarburization 

摘      要：Corrosion test of a Ni–16Mo–7Cr alloy with a decarburized layer was conducted in FLiNaK salt at 700 °C. A detailed microstructure study was performed to investigate the corrosion behavior and mechanisms. The results show that the Ferich layers were formed on the corroded alloys with and without decarburization. The surface decarburization had little influence on the corrosion resistance of the alloy, whereas it caused more M_2C carbide formation beneath the corrosion layer. That is attributed to the higher concentration of C gradient near the alloy surface, which was resulted from the increase in C content liberated from graphite crucible wall during the corrosion process.