时效处理对446超级铁素体不锈钢组织与力学性能的影响  

Effects of Aging Treatment on Microstructure and Mechemical Properties of 446 Super Ferrite Stainless Steel

作　　者：骆毅 李文琪 梁伟[1] 赵兴国[1] 李建春[1,2] 梁兴中 LUO Yi;LI Wenqi;LIANG Wei;ZHAO Xingguo;LI Jianchun;LIANG Xingzhong(School of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Taiyuan Iron&Steel Co.,Ltd.,Taiyuan 030003,China;Department of Engineering,University of Leicester,Leicester LE17RH,UK)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024 [2]山西太钢不锈钢股份有限公司,山西太原030003 [3]莱斯特大学工学部,英国莱斯特郡

出　　处：《热加工工艺》2020年第8期129-131,135,共4页Hot Working Technology

基　　金：山西省重点研发计划国际合作项目(201603D421026)。

摘　　要：研究了800℃时效处理对446超级铁素体不锈钢微观组织与力学性能的影响。采用扫描电镜和能谱仪分析了微观组织结构,通过拉伸试验、夏比冲击试验研究了力学性能。结果表明:466超级铁素体不锈钢对800℃时效处理敏感,此时脆性σ相极易析出。少量的σ相有利于提高材料的抗拉强度;当σ相析出形成网状结构时,使材料的抗拉强度和伸长率急剧下降,即使未形成网状结构,σ相析出也会造成材料的冲击韧性急剧下降。The effects of aging treatment at 800℃ on the microstructure and mechanical properties of 446 super ferrite stainless steel were studied.The microstructure was analyzed by scanning electron microscope and energy dispersive spectrometer.The mechanical properties were studied by tensile test and charpy impact test.The results show that,446 super-ferritic stainless steel is sensitive to aging treatment at 800℃,and the brittleσphase is easy to precipitate at this time.A small amount ofσphase can improve the tensile strength of the material.Whenσphase precipitates to form a network structure,the tensile strength and elongation of the material decrease sharply.Even if the network structure is not formed,the precipitate of σ phase results in a sharp decrease in the impact toughness of the material.

关 键 词：800℃时效处理 446不锈钢 Σ相 微观组织 力学性能 

分 类 号：TG156.92[金属学及工艺—热处理] TG142.23[金属学及工艺—金属学]