TiAl基合金格栅结构预制空位拉制成形研究  

Study on stretch forming of TiAl based alloy grid structure with precutting empty seams

作　　者：杨尚 蒋少松[1] 李保永[2] 于泓权 张凯锋[1] 卢振[1] YANG Shang;JIANG Shao-song;LI Bao-yong;YU Hong-quan;ZHANG Kai-feng;LU Zhen(National Key Laboratory for Precision Hot Processing of Metals,Harbin Institute of Technology,Harbin 150001,China;Beijing Hangxing Machine Manufacturing Co.,Ltd.,Beijing,100013,China;Xi′an Aerospace Engine Co.,Ltd.,Xi′an 710018,China)

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,黑龙江哈尔滨150001 [2]北京航星机器制造有限公司,北京100013 [3]西安航天发动机有限公司,陕西西安710018

出　　处：《塑性工程学报》2024年第10期93-99,共7页Journal of Plasticity Engineering

基　　金：黑龙江省自然科学基金资助项目(JQ2020E002)。

摘　　要：为解决TiAl基合金板材制备困难、成形性能差以及难以采用传统方法制造格栅结构的问题,采用预置空位拉制成形方法制造TiAl基合金格栅结构。在烧结温度1150℃、烧结压力30 MPa、保温时间2 h条件下,通过预合金粉末热压烧结工艺制备TiAl基合金。TiAl基合金板料预制空位拉制成形温度为990℃,应变速率为0.001 s^(-1)。结果表明,随着板材变形长度增加,空位形状变化为纵向菱形→正方形→横向菱形,空位沿板材分布比较均匀,与模拟结果相符;板材最大拉应变位置由空位圆角处转移到空位交叉处,最大拉应变值为0.5。当TiAl基合金预置空位板材变形长度最大达到89 mm时,变形区伸长率为112%。To solve the problems of difficult preparation and poor formability of TiAl based alloy sheet and difficult to fabricate the grid structure by traditional method,the precutting empty seam stretch forming method was used to fabricate TiAl based alloy grid structure.TiAl based alloy was prepared by hot pressing sintering of prealloyed powder under the sintering temperature of 1150℃,sintering pressure of 30 MPa and holding time of 2 h.The precutting empty seam stretch forming temperature of TiAl based alloy sheet is 990℃and the strain rate is 0.001 s^(-1).The results show that with the increase of the deformation length of the sheet,the shape of the seams is formed from the longitudinal diamond to the square to the transverse diamond,and the distribution of the seams along the sheet is relatively uniform,which is consistent with the simulation results.The maximum tensile strain position of the sheet is transferred from the corner of the seams to the intersection of the seams,and the maximum tensile strain value is 0.5.When the maximum deformation length of TiAl based alloy sheet with precutting empty seams reaches 89 mm,the elongation of deformation area is 112%.

关 键 词：TIAL基合金 格栅结构 预制空位 拉制成形 

分 类 号：TG146.2[一般工业技术—材料科学与工程]