熔盐堆用镍基合金失效机理与改性策略研究进展

王优, 陈向阳, 王煦嘉, 汤春桃, 沈朝, 曾小勤

Progress in Failure Mechanisms and Modification Strategies of Nickel-Based Alloys for Molten Salt Reactors

WANG You, CHEN Xiangyang, WANG Xujia, TANG Chuntao, SHEN Zhao, ZENG Xiaoqin

图3 625合金在700 ℃含0.5%Te的熔融FLiNaK盐中腐蚀48 h后的BSE像及元素线扫描分布曲线[23]；Ni在含Te熔融盐中腐蚀后Te沿晶界向基体内部扩散的EPMA像和元素分布图[24]；GH3535合金在700 ℃含Te的熔融FLiNaK盐中腐蚀1000 h后的截面形貌及EPMA元素面扫描分布图[26]；含Te熔盐腐蚀前后304不锈钢[27]、GH3535合金[24]的室温拉伸曲线图及形貌

Fig.3 BSE images and elemental line-scan profiles of alloy 625 after 48 h corrosion in molten FLiNaK salt containing 0.5%Te at 700 oC[23] (a), EPMA image and corresponding elemental map showing Te penetration along grain boundaries after corrosion in Te-containing molten salt[24] (b), cross-sectional morphology and EPMA elemental mappings of GH3535 alloy after 1000 h corrosion in molten FLiNaK salt containing Te at 700 oC[26] (Arrows show the carbides) (c), and room-temperature tensile curves and morphologies (insets) of 304 stainless steel[27] (w/o—without) (d1) and GH3535 alloy[24] (d2) before and after corrosion in Te-containing molten salt