摘要
采用光学显微镜、扫描电镜、矩形单轴蠕变测试、X射线衍射研究了三种不同B含量的9Cr铁素体耐热钢正火回火后的组织特征和蠕变性能。结果表明:9Cr铁素体耐热钢的显微结构为回火马氏体;随着硼含量的增加,马氏体板条逐渐细化,M_(23)C_(6)的密度增大,平均粒径变小;随硼含量的增加,9Cr铁素体耐热钢的最小蠕变率降低,加速蠕变延缓,断裂时间增长,但伸长率降低。硼元素能有效降低M_(23)C_(6)碳化物的Orowan成熟速率,细化马氏体板条,提高9Cr铁素体耐热钢的蠕变强度。
The microstructure and creep properties of 9 Cr ferritic heat resistant steels containing different content of boron after normalizing and tempering were studied by optical microscopy,scanning electron microscopy,X-ray diffraction and rectangular uniaxial creep testing.The results show that the microstructure of 9 Cr ferritic heat resistant steel is tempered martensite.As the boron content increases,the martensite lath gradually refines,the density of M_(23)C_(6)increases and the particle size becomes smaller.With the increase of boron content,the minimum creep rate decreases,the onset time of accelerated creep becomes slower and the rupture time increases,whereas,the elongation decreases.Boron is beneficial to the refinement of the tempered martensite lath structure.Boron could effectively decrease the rate of Orowan ripening of M_(23)C_(6)carbides and improve the creep strength of 9 Cr ferritic heat resistant steel.
作者
胡福勇
申俊杰
赵庆权
肖功业
HU Fuyong;SHEN Junjie;ZHAO Qingquan;XIAO Gongye(Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control,Tianjin University of Technology,Tianjin 300384,China;National Demonstration Center for Experimental Mechanical and Electrical Engineering Education,Tianjin University of Technology,Tianjin 300384,China;Tianjin Pipe(Group)Corporation,Tianjin 300384,China)
出处
《热加工工艺》
北大核心
2021年第18期51-55,共5页
Hot Working Technology
基金
国家自然科学基金项目(51605330,11602169)
天津市自然科学基金项目(18JCYBJC88700)。
作者简介
胡福勇(1995-),男,山东菏泽人,硕士研究生,主要研究方向:9%铬耐热钢高温蠕变性能,电话:17694883834,E-mail:yongye673411728@163.com;通讯作者:申俊杰(1983-),男,山西原平人,副教授,博士,主要研究方向:高铬耐热钢在高温低应力下的蠕变性能,电话:13516233995,E-mail:sjj1982428@sina.com。
