冷形变对AISI316L奥氏体不锈钢低温渗氮行为影响的研究  

Effect of Cold Deformation on Nitriding Behavior of AISI316L Austenitic Stainless Steel at Low Temperature

作　　者：曹驰[1,2] 路永宽[1] 陈志林 李亚敏 牟鑫斌[2] 罗丽萍 CAO Chi;LU Yongkuan;CHEN Zhilin;LI Yamin;MOU Xinbin;LUO Liping(School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Wenzhou Pump and Valve Engineering Research Institute,of Lanzhou University of Technology,Wenzhou 325105,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学温州泵阀工程研究院,浙江温州325105

出　　处：《热加工工艺》2022年第22期111-115,共5页Hot Working Technology

基　　金：甘肃省科技计划资助项目(20YF8GA058)。

摘　　要：将AISI316L奥氏体不锈钢分别进行拉伸率为10%、30%、50%的室温形变后进行380℃的离子渗氮处理,并通过与仅渗氮试样进行显微组织、耐蚀性等的对比分析,讨论不同形变量对奥氏体不锈钢低温离子渗氮行为的影响。结果表明:形变能促进低温渗氮过程中氮原子在基体中的扩散速率,能够大幅度增加渗层厚度及硬度,但会使渗层耐蚀性有所下降;随着形变量增加,渗层厚度先增后减,30%拉伸率为最佳形变量;在形变量达到50%时,氮化物与柯氏气团的出现,减弱了室温形变对渗氮进程的促进作用。The AISI316L austenitic stainless steel was deformed at room temperature with tensile rate of 10%, 30% and 50%, respectively, and then ion nitrided at 380 ℃. The microstructure and corrosion resistance of nitriding samples were compared and analyzed, and the effects of different deformation on the low temperature ion nitriding behavior of austenitic stainless steel were discussed. The results show that the deformation can promote the diffusion rate of nitrogen atoms in the matrix during low temperature nitriding, it can greatly increase the thickness and hardness of the nitrided layer at the same time.However, it will reduce the corrosion resistance of the nitrided layer with the increase of deformation, the thickness of infiltration layer increases first and then decreases, and 30% tensile rate is the best deformation rate. When the deformation reaches 50%, the appearance of nitride and cottrell atmosphere weakens the promotion of deformation at room temperature to nitriding process.

关 键 词：奥氏体不锈钢 低温离子渗氮 室温形变 

分 类 号：TG156.82[金属学及工艺—热处理]