热处理对RAFM钢挤压管组织和力学性能的影响  

Effects of heat treatment on microstructure and mechanical properties of RAFM steel extruded tube

作　　者：曹萍 王国波 陈登武 苏诚 Cao Ping;Wang Guobo;Chen Dengwu;Su Cheng(Zhejiang Jiuli Hi-Tech Metals Co.,Ltd.,Huzhou Zhejiang 313008,China;Zhejiang Jiuli Metal Materials Research Institute Co.,Ltd.,Huzhou Zhejiang 313008,China;Zhejiang Jiaxiang Precision Machinery Technology Co.,Ltd.,Huzhou Zhejiang 313008,China)

机构地区：[1]浙江久立特材科技股份有限公司,浙江湖州313008 [2]浙江久立金属材料研究院有限公司,浙江湖州313008 [3]浙江嘉翔精密机械技术有限公司,浙江湖州313008

出　　处：《金属热处理》2025年第4期207-212,共6页Heat Treatment of Metals

摘　　要：对经双真空熔炼结合多道次热锻再热挤压成形的∅57 mm×6 mm规格RAFM钢挤压管材进行780~1200℃热处理,研究了不同热处理温度下挤压管的组织和力学性能。研究表明,在780~1200℃热处理时,RAFM钢挤压管的组织随热处理温度升高的演变为:回火板条马氏体组织(780~900℃)、马氏体基体+铁素体+细小弥散分布碳化物组织(950~1000℃)和板条马氏体组织(1050~1200℃)。RAFM钢挤压管的室温抗拉强度、屈服强度和硬度随热处理温度的升高呈先下降再上升的趋势,伸长率则呈先上升再下降的趋势。经850℃热处理后,RAFM钢挤压管获得相对优异的室温伸长率及相对较低的强度,便于后续的生产加工。Heat treatment between 780-1200℃for RAFM steel extruded tube with size of∅57 mm×6 mm obtained by double vacuum melting combined with multi-pass hot forging and re-hot extrusion was carried out,and the microstructure and mechanical properties of the extruded tube at different heat treatment temperatures were studied.The results show that after heat treatment between 780-1200℃,the microstructure evolution of the RAFM steel extruded tube with increasing temperature is as follows:tempered lath martensite(780-900℃),martensite matrix+ferrite+fine dispersed carbides(950-1000℃)and lath martensite(1050-1200℃).The tensile strength,yield strength and hardness of the RAFM steel extruded tube at room temperature decreases first and then increases with the increase of heat treatment temperature,while the elongation increases first and then decreases.After heat treatment at 850℃,the RAFM steel extruded tube obtains relatively excellent room temperature elongation and relatively low strength,which is convenient for subsequent production and processing.

关 键 词：RAFM钢 组织演变 力学性能 硬度 

分 类 号：TG156[金属学及工艺—热处理]