高压扭转压力对304不锈钢组织及性能影响  

Influence of high-pressure torsion pressure on microstructure and mechanical property of 304 stainless steel

作　　者：田野[1] 李萍[1] 王久林[1] 薛克敏[1] 林泉[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《塑性工程学报》2016年第2期98-102,共5页Journal of Plasticity Engineering

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-13-0765);国家自然科学基金资助项目(51175138)

摘　　要：以304奥氏体不锈钢为研究对象,采用高压扭转工艺对其性能进行改进。利用金相显微镜、显微硬度计和X射线衍射仪分析压力对304奥氏体不锈钢组织和性能的影响规律。结果表明,压力越大对基体组织晶粒剪切破碎越有利,晶粒细化及强化效果越明显。高压扭转前后材料内部位错密度由3.41×1014 m-2增加到5.07×1014 m-2,亚晶尺寸由59.54nm细化到46.03nm,细化程度达22.7%。高压扭转主要通过细晶引起晶粒滑移系位错源开动的阻碍作用来实现304奥氏体不锈钢强化。High-pressure torsion（HPT）was used to improve the property of 304 stainless steel.The effects of the pressure on the microstructure and property of the 304 stainless steel were studied by optical telescope,micro hardness testing device and Xray diffractometer.The results show that the higher pressure is helpful for the grain shear fracture of the matrix organization,grain refinement and strengthening.In the HPT,the dislocation density increases from 3.41×1014 m-2to 5.07×1014 m-2,the subgrain size decreases from 59.54 nm to 46.03 nm with refinement degree reaching 22.7%.The strengthening of 304 austenitic stainless steel based on HPT is mainly caused by preventing the grain slip systems dislocation sources by refine grain.

关 键 词：304不锈钢 高压扭转 剪切变形 位错密度 

分 类 号：TB331[一般工业技术—材料科学与工程]