【作者】 杨英； 燕青芝； 马荣； 杨亚峰； 黎兴刚； 葛昌纯；

【Author】 YANG Ying,YAN Qing-zhi,MA Rong,YANG Ya-feng, LI Xing-gang,GE Chang-chun (School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China)

【机构】 北京科技大学材料科学与工程学院；

【摘要】 针对超临界水堆堆内构件工况要求和未来商用聚变堆结构材料要求设计了CNS系列铁素体马氏体钢和Mod-AL-6XN钢,并根据设计成分进行了不同批次和规模的熔炼,研究了相应的冷热加工工艺,热处理工艺及组织和性能的关系,进行了厚板、薄板和薄壁无缝钢管的制备,初步掌握了几种钢的各种截面型材的制备工艺及性能控制方法。CNS-Ⅰ、CNS-Ⅱ和Mod-CNS-Ⅱ钢室温抗拉强度分别达到680MPa、800MPa和917MPa,延伸率分别达到24.5%、22.5%和20%;600℃时三种钢的抗拉强度分别达到365MPa、423MPa和482MPa,延伸率分别达到23.5%、22%和31%;三种钢的韧脆转变温度分别为-90℃、-25℃和-55℃。Mod-AL-6XN钢的室温和500℃的抗拉强度同AL-6XN接近为745MPa和565MPa,延伸率分别达到了53.3%和60.4%。对CNS系列钢和Mod-AL-6XN钢进行了不同条件下超临界水腐蚀性能测试,结果表明奥氏体钢的耐超临界水腐蚀性能要远高于铁素体马氏体钢,随钢中Cr含量增加铁素体马氏体钢的耐超临界水腐蚀性能增加。超临界水腐蚀后,在两类钢表面均形成了两层的氧化膜,其中氧化膜外层富Fe贫Cr为磁铁矿Fe₃O₄相,氧化膜内层富Cr贫Fe为尖晶石结构的FeCr₂O₄相。更多还原

【Abstract】 CNS series ferritic/martensitic（F/M） steel and Mod-AL-6XN steel was developed aim at critical water cooled reactor in-core components and structure materials for future commercial fusion reactor and different scales and batches of these steel were fabricated.The cold and hot deformation processes,heat treatment parameters and the relationship of microstructure and properties were invested intensively.At last,thick plate,sheet and seamless steel tube were fabricated. The tensile strength of CNS-Ⅰ,CNS-Ⅱand Mod-CNS-Ⅱsteel at room temperature were 680MPa,800MPa and 917MPa,respectively,and the total elongation of these steels were 24.5%,22.5%and 20%respectively.At 600℃the tensile strength of these steels were 365MPa,423MPa and 482MPa,respectively,and the total elongation were 23.5%,22%and 31%,respectively.The ductile to brittle transition temperature（DBTT） of these steel were -90℃,-25℃and - 55℃,respectively.The tensile strength of Mod-AL-6XN and AL-6XN were 745MPa and 565MPa at room temperature and 500℃,the total elongation of Mod-AL-6XN were 53.3%and 60.4%,respectively. At last,CSN series steel and Mod-AL-6XN steel were tested at supercritical water at different conditions to evaluating the corrosion behavior of these steels.The results show that the austensitic steel has better corrosion resistance than F/M steels and increasing in weight percent of Cr in F/M steel can improve their corrosion resistance.After the corrosion tests a two layer oxide scale were identified on all steels.Fe was enriched in the outer oxide layer and depleted in the inner oxide layer and the distribution of Cr was opposed to Fe.The outer oxide layer was mainly composed of Fe₃O₄,and the inner oxide layer was mainly FeCr₂O₄.更多还原