摘要
采用有限元模拟技术研究TC4合金内筋筒形件在热等静压(HIP)过程中的致密化行为,通过响应面技术获得优化的HIP工艺参数,并开展优化工艺条件下的HIP实验;分别对HIP制备TC4合金内筋筒形件的不同部位开展致密度、力学性能测试以及微观组织和断口形貌表征。结果表明:TC4合金内筋筒形件的外表面优先致密,筒壁和筒底芯部的致密度最高,HIP压力对致密化的影响高于保温保压时间对致密化的影响;HIP制件筒壁和筒底的组织致密均匀、室温拉伸性能接近,筒壁室温拉伸性能均略优。350℃时,筒壁和筒底的拉伸性能差值进一步缩小,抗拉强度保持率达到近70%。室温和350℃拉伸变形试样均以韧性断裂为主的断裂特征。
The densification behavior of TC4 alloy inner ribbed cylindrical parts during hot isostatic pressing(HIP)was studied by using finite element simulation technology.The optimized HIP process parameters were obtained through response surface methodology.HIP experiments were conducted under the optimized process.The density and mechanical properties tests were conducted on different sampling positions of the TC4 alloy inner ribbed cylindrical parts prepared by the HIP.The microstructure and fracture morphology were also characterized.The results show that the outer surface of TC4 alloy inner ribbed cylindrical parts is preferentially densified,with the highest density at the center of the cylinder wall and bottom.The contribution of HIP pressure to densification is more significant than that of insulation and pressure holding time.The microstructures of the wall and bottom of the HIPed product are dense and uniform,with similar room temperature tensile properties.The room temperature tensile properties of the wall are slightly better.At temperature of 350℃,the difference in tensile properties of cylinder wall and bottom is further narrowed and the retention rate of tensile strength reaches nearly 70%.The tensile deformation specimens both at room temperature and 350℃exhibit fracture characteristics dominated by ductile fracture.
作者
徐博
董添添
邓太庆
易卓勋
徐岩
贾建波
XU Bo;DONG Tiantian;DENG Taiqing;YI Zhuoxun;XU Yan;JIA Jianbo(Key Laboratory of Advanced Forging&Stamping Technology and Science,Ministry of Education of China,Yanshan University,Qinhuangdao 066004,China;National-Local Joint Engineering Research Center for Advanced Manufacturing,Forming Technology and Equipment,Yanshan University,Qinhuangdao 066004,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China;Beijing Spacecrafts,China Academy of Space Technology,Beijing 100094,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2024年第7期2257-2272,共16页
The Chinese Journal of Nonferrous Metals
基金
河北省自然科学基金资助项目(E2020203073)
河北省教育厅科学研究资助项目(QN2021146)。
关键词
TC4合金内筋筒形件
热等静压
致密化
微观组织
力学性能
TC4 alloy inner ribbed cylindrical parts
hot isostatic pressing
densification
microstructure
mechanical property
