扩径用不锈钢旋压件的组织性能研究  

Study on microstructure and properties of stainless steel spinning parts for expanding

作　　者：李娜[1] 张文文[1] 李群[1] 张胜利 郭宝峰[1] 马世成[2] 王东坡[2] LI Na;ZHANG Wen-wen;LI Qun;ZHANG Sheng-li;GUO Bao-feng;MA Shi-cheng;WANG Dong-po(School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;Aerospace Research Institute of Special Material and Processing Technology, Beijing 100074, China)

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]航天特种材料及工艺技术研究所,北京100074

出　　处：《塑性工程学报》2018年第2期211-216,共6页Journal of Plasticity Engineering

基　　金：河北省科技计划项目(152176315)

摘　　要：针对不锈钢旋压件在机械扩径时加工困难，容易断裂，危险系数高，旋压时产生的加工硬化导致进一步扩径加工的低塑性问题，通过对旋压后不锈钢材料进行不同的加热温度和保温时间条件下的再结晶退火处理，改善了其塑性，同时利用SEM分析了旋压件不锈钢材料的塑性改善微观机理。结果表明，当再结晶退火温度为1000℃时，可获得最大塑性，同时，伸长率也得到极大改善，最有助于进一步机械扩径，这主要是由于经该工艺退火后的不锈钢在变形过程中产生了明显的形变诱导塑性效应。而且，在较低温度（850℃）下退火，可获得细化的晶粒组织，从而获得高的强度。Stainless steel spinning parts were difficult to be machined and liable to crack, also has high risk factor when mechanical ex- panding. Meanwhile the work hardening caused by spinning leads to lower plasticity of further expanding. The plasticity of the stainless steel materials after spinning was improved through the reerystallization annealing treatment under different heating temperatures and hold- ing time conditions. At the same time the microscopic mechanism of plasticity improvement about stainless steel materials was analyzed by SEM. The results indicate that the best plasticity is obtained as the elongation is improved greatly, at the recrystallization annealing tem- perature of 1000 ℃, which is the most helpful for further mechanical expansion. This is mainly due to the obvious transformation induced plasticity （TRIP） occurred during the deformation process of the stainless steel after recrystallization annealing. In addition, refined grain structure and high strength can be obtained by annealing at lower temperature （850℃ ）.

关 键 词：不锈钢 旋压件 扩径 力学性能 微观形貌 TRIP效应 

分 类 号：TG156.9[金属学及工艺—热处理]