等通道热挤压00Cr19Ni10奥氏体不锈钢的晶粒细化机制  

Grain Refinement Mechanism of 00Cr19Ni10 Austenite Stainless Steel by Hot Equal Channel Angular Pressing

作　　者：王昌[1] 杨钢[1] 王立民[1] 高永亮[1] 钟海林[1] 

机构地区：[1]钢铁研究总院结构材料研究所,北京100081

出　　处：《特殊钢》2007年第2期10-12,共3页Special Steel

基　　金：国家863高技术研究发展计划基金资助项目(2002AA302501)

摘　　要：Φ8 mm 00Cr19Ni10不锈钢(％:0．025C、18．75Cr、10．96Ni)经700℃、挤压速度9 mm／s、8道次等通道挤压后获得150-350 nm超细晶组织。通过光学显微镜,扫描和透射电镜,X-射线衍射,分析了在等通道挤压变形过程钢的微观组织演变,提出晶粒细化的位错、孪晶和动态再结晶机制,研究发现在1-4道次以孪晶细化机制为主,5-8道次以动态再结晶细化机制为主。150 - 350 nm super fine grain structure of Ф8 mm round stainless steel 00Cr19Ni10- 0. 025C, 18.75Cr, 10.96Ni has been obtained by 8 pass equal channel angular pressing （ECAP） with extrusion speed 9 mm/s at 700 ℃. The structure evolution of steel in ECAP was analyzed by optical microscope, scanning and transmission electron microscope and X-ray diffraction method. The grain refinement mechanism - dislocation, twins and dynamic recrystallization is proposed and the research discovers that the twins is main grain refining mechanism in 1 - 4 pass and the dynamic recrystallization is main refining mechanism in 5- 8 pass.

关 键 词：等通道热挤压法 奥氏体不锈钢 晶粒细化机理 

分 类 号：TG376[金属学及工艺—金属压力加工]