胀形对TC4合金环锻件残余应力及分布的影响  

Effect of Bulging Process on Residual Stress and Its Distribution of TC4 Alloy Ring Forgings

作　　者：魏志坚[1,2,3] 李金山 杨艳慧[1,3] 吕楠 王建国[1,3] Wei Zhijian;Li Jinshan;Yang Yanhui;Lv Nan;Wang Jianguo(Northwestern Polytechnical University,Xi'an 710072,China;Guizhou Anda Aviation Forging Co. Ltd,Anshun 561005,China;Defense Technologies Innovation Center of Precision Forging and Ring Rolling, Xi'an 710072,China)

机构地区：[1]西北工业大学,陕西西安710072 [2]贵州安大航空锻造有限责任公司,贵州安顺561005 [3]国防科技工业精密锻造与环轧技术创新中心,陕西西安710072

出　　处：《稀有金属材料与工程》2019年第8期2537-2543,共7页Rare Metal Materials and Engineering

基　　金：中央高校基本科研业务费专项资金（3102019ZX004)

摘　　要：对TC4合金辗轧环锻件残余应力进行了测试,分析了胀形技术对TC4合金辗轧环锻件残余应力及分布的影响。结果表明,采用绘制雷达图的方式可对环形件残余应力大小和分布均匀性进行有效表征和分析,采用胀形技术可实现辗轧环件的残余应力调控。现有辗轧及胀形工艺下,TC4合金环件表面残余应力均为残余压应力,且在–50~–150MPa范围内波动;残余应力分布雷达图存在"尖角",胀形后"尖角"趋于平缓;经胀形处理后环件残余应力均值略有降低,周向应力较轴/径向应力的降幅更加显著,内环面与上端面周向应力经胀形后应力均值降幅分别达24.8%与20.2%;经胀形处理后环件残余应力均匀性整体有所提高;仅下端面周向应力大小及分布均匀性改善效果不明显。Residual stresses in TC4 ring forgings were tested and described using radar charts. The effects of bulging process on residual stress and its distribution along circumference were analyzed. The results show that radar charts can describe effectively the values and distributions of residual stresses along circumference for the ring forgings. And the bulging process is an effective way to adjust the residual stress in the ring forgings. For the ring forgings in the present paper, the residual stresses are compressive stresses and fluctuate in the range of –50~–150 MPa. A sharp area exists in each radar chart and is weakened after bulging process;meanwhile, the average residual stress is decreased slightly. The hoop stresses are relaxed much more than the axial and radial stresses, especially on the inner face and upper end surface with the reduction rate of about 24.8% and 20.2%, respectively. The distribution uniformity of residual stress is improved after the bulging process, except for the lower end surface.

关 键 词：残余应力 TC4合金 盲孔法 胀形 

分 类 号：TG319[金属学及工艺—金属压力加工]