工程科学学报，第40卷，第5期：571-578,2018年5月 Chinese Joural of Engineering,Vol.40,No.5:571-578,May 2018 DOI:10.13374/j.issn2095-9389.2018.05.007;http://journals.ustb.edu.cn 热处理对四代核电用镍基合金薄壁管组织与性能的影响 李郑周12)，佴启亮23)四，莫少华2)，王宝顺23)，王曼23)，董建新 1)北京科技大学材料科学与工程学院，北京1000832)浙江久立特材科技股份有限公司，湖州313028 3)浙江省核电用高性能管材成形工程技术研究中心，湖州313028 ☒通信作者，E-mail:naiqiliang(@126.cowm 摘要利用热力学计算软件MatPro分析了钍基熔盐堆用Ni-Cr-Mo系高温合金GHB535相析出的热力学及动力学特征， 研究了不同热处理制度对冷轧态GH3535合金无缝管的晶粒尺寸及其均匀性、碳化物析出特征，硬度、拉伸性能等的影响规 律，观察了不同热处理制度下合金拉伸断口的微观形貌.分析了GH3535合金的拉伸断裂机制.结果表明：在900~1500℃之 间，GH3535合金的平衡析出相为富Mo的MC型碳化物，MC相在固液两相区时便已经开始形成，M。C相析出所对应的鼻尖 温度为1200℃：固溶温度低于1200℃时，合金晶粒尺寸缓慢长大，当固溶温度提高到1230℃，晶粒出现快速长大，平均晶粒尺 寸达到160m:1180℃保温10mim,合金晶粒尺寸的均匀性较好.随着固溶温度升高，合金强度降低、延伸率增加，GH3535合 金的拉伸断裂机制为微孔聚集型. 关键词GH3535合金；热力学计算；热处理制度；微观组织：力学性能 分类号TG142.71 Effect of heat treatment on the microstructure and properties of nickel-based superalloy thin-wall pipe for the fourth-generation nuclear reactor Zheng-ahom2,NAQi--liang2),M0Sha-hua》,WANG Bao--shn2》,WANG Mani23》,D0 NG Jiar-in》 1)School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Zhejiang Jiuli Hi-tech Metals Co.,Ltd.,Huzhou 313028,China 3)Engineering Research Center of High Performance Nuclear Power Pipe Forming of Zhejiang Province,Huzhou 313028,China Corresponding author,E-mail:naiqiliang@jiuli.com ABSTRACT In recent years,the development of next-generation nuclear reactors with enhanced requirements for the safe and relia- ble production of nuclear energy has been attracting increasing attention.The thorium molten salt reactor (TMSR)has been regarded as the most promising prospective next-generation nuclear reactor because of its high security,desirable online refueling properties,mini- mization of nuclear waste,nuclear non-proliferation,etc.The structural materials for molten salt reactors should exhibit high tempera- ture resistance and good corrosion and neutron irradiation resistance.The Ni-Cr-Mo-based superalloy GH3535 is the preferred material for TMSR applications because of its superior corrosion resistance and good mechanical properties.The Mo content of GH3535 is 15% -18%(mass fraction),which leads to the precipitation of a large amount of Mo-enriched MC carbides in the matrix.Numerous studies have shown that the precipitation of these carbides directly affects the grain size and mechanical properties of GH3535 alloy.In this study,the effects of heat treatment on the grain size,carbide distribution,and mechanical properties of GH3535 alloy were investi- gated by cold-rolled-pipe tests.To provide the experimental and theoretical basis for applying heat treatment to control the properties of GH3535 alloy,the thermodynamic and kinetics characteristics of GH3535 were calculated using the JMatPro simulation software.The influence of heat treatments on the size and homogeneity of grains,the precipitation character of carbides,and the mechanical proper- ties of the alloy were investigated.The results show that the equilibrium precipitate of the GH3535 at temperatures between 900C and 收稿日期：2017-10-26工程科学学报,第 40 卷,第 5 期:571鄄鄄578,2018 年 5 月 Chinese Journal of Engineering, Vol. 40, No. 5: 571鄄鄄578, May 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 05. 007; http: / / journals. ustb. edu. cn 热处理对四代核电用镍基合金薄壁管组织与性能的影响 李郑周1,2) , 佴启亮2,3) 苣 , 莫少华2) , 王宝顺2,3) , 王 曼2,3) , 董建新1) 1) 北京科技大学材料科学与工程学院, 北京 100083 2) 浙江久立特材科技股份有限公司, 湖州 313028 3) 浙江省核电用高性能管材成形工程技术研究中心, 湖州 313028 苣 通信作者, E鄄mail: naiqiliang@ 126. com 摘 要 利用热力学计算软件 JMatPro 分析了钍基熔盐堆用 Ni鄄鄄Cr鄄鄄Mo 系高温合金 GH3535 相析出的热力学及动力学特征, 研究了不同热处理制度对冷轧态 GH3535 合金无缝管的晶粒尺寸及其均匀性、碳化物析出特征、硬度、拉伸性能等的影响规 律,观察了不同热处理制度下合金拉伸断口的微观形貌,分析了 GH3535 合金的拉伸断裂机制. 结果表明:在 900 ~ 1500 益 之 间,GH3535 合金的平衡析出相为富 Mo 的 M6C 型碳化物,M6C 相在固液两相区时便已经开始形成,M6C 相析出所对应的鼻尖 温度为 1200 益 ;固溶温度低于 1200 益时,合金晶粒尺寸缓慢长大,当固溶温度提高到 1230 益 ,晶粒出现快速长大,平均晶粒尺 寸达到 160 滋m;1180 益保温 10 min,合金晶粒尺寸的均匀性较好. 随着固溶温度升高,合金强度降低、延伸率增加,GH3535 合 金的拉伸断裂机制为微孔聚集型. 关键词 GH3535 合金; 热力学计算; 热处理制度; 微观组织; 力学性能 分类号 TG142郾 71 收稿日期: 2017鄄鄄10鄄鄄26 Effect of heat treatment on the microstructure and properties of nickel鄄based superalloy thin鄄wall pipe for the fourth鄄generation nuclear reactor LI Zheng鄄zhou 1,2) , NAI Qi鄄liang 2,3) 苣 , MO Shao鄄hua 2) , WANG Bao鄄shun 2,3) , WANG Man 2,3) , DONG Jian鄄xin 1) 1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China 2) Zhejiang Jiuli Hi鄄tech Metals Co. , Ltd. , Huzhou 313028, China 3) Engineering Research Center of High Performance Nuclear Power Pipe Forming of Zhejiang Province, Huzhou 313028, China 苣 Corresponding author, E鄄mail: naiqiliang@ jiuli. com ABSTRACT In recent years, the development of next鄄generation nuclear reactors with enhanced requirements for the safe and relia鄄 ble production of nuclear energy has been attracting increasing attention. The thorium molten salt reactor (TMSR) has been regarded as the most promising prospective next鄄generation nuclear reactor because of its high security, desirable online refueling properties, mini鄄 mization of nuclear waste, nuclear non鄄proliferation, etc. The structural materials for molten salt reactors should exhibit high tempera鄄 ture resistance and good corrosion and neutron irradiation resistance. The Ni鄄鄄Cr鄄鄄Mo鄄based superalloy GH3535 is the preferred material for TMSR applications because of its superior corrosion resistance and good mechanical properties. The Mo content of GH3535 is 15% ~ 18% (mass fraction), which leads to the precipitation of a large amount of Mo鄄enriched M6 C carbides in the matrix. Numerous studies have shown that the precipitation of these carbides directly affects the grain size and mechanical properties of GH3535 alloy. In this study, the effects of heat treatment on the grain size, carbide distribution, and mechanical properties of GH3535 alloy were investi鄄 gated by cold鄄rolled鄄pipe tests. To provide the experimental and theoretical basis for applying heat treatment to control the properties of GH3535 alloy, the thermodynamic and kinetics characteristics of GH3535 were calculated using the JMatPro simulation software. The influence of heat treatments on the size and homogeneity of grains, the precipitation character of carbides, and the mechanical proper鄄 ties of the alloy were investigated. The results show that the equilibrium precipitate of the GH3535 at temperatures between 900 益 and