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作 者:马丁 郎利辉[1] 肖毅 孟凡迪 李世越 MA Ding;LANG Lihui;XIAO Yi;MENG Fandi;LI Shiyue(School of Mechanical Engineering and Automation,Beihang University,Beijing 100083,China)
机构地区:[1]北京航空航天大学机械工程及自动化学院,北京100083
出 处:《粉末冶金材料科学与工程》2020年第3期185-190,共6页Materials Science and Engineering of Powder Metallurgy
摘 要:采用陶瓷模具控形,在高温高压柔性介质加载下制备GH4169异形超细曲面,曲面厚度为0.6 mm。利用扫描电镜观察和分析异形曲面横截面的致密化程度,结果表明,截面两端处最致密,中部中心处次之,中部边缘处致密度化程度最低。同时采用经过单拉实验修正后的Shima-Oyane本构方程进行数值模拟,得到异形曲面中性面的致密度、等效柯西应力与位移矢量三者的分布云图,并从节点位移角度阐述GH4169粉末在刚性模具中的致密化行为。结果表明,热等静压过程中,异形曲面沿厚度方向向内收缩,两端的位移最大,致密度最高,中部的中心位置次之,中部边缘处致密度最低。模拟结果与实验结果一致。The ceramic mold was used to control the shape and the GH4169 ultra-fine irregular curved surface was prepared under the high temperature and high pressure flexible medium,the thickness of the curved surface was 0.5 mm.The densification degree of the irregular curved surface was observed and analyzed by SEM.The results show that the densification degree of the curved surface is the densest at both ends,followed by the middle center,and the lowest at the middle edge.At the same time,the Shima-Oyane constitutive equation modified by the uniaxial tension experiment was used to simulate the numerical simulation.The distribution nephogram of density,equivalent Cauchy stress and displacement vector of the neutral surface of the irregular curved surface were obtained.The densification behavior of GH4169 powder in the rigid mold was described from the point of node displacement.The results show that in the process of hot isostatic pressing,the irregular surface shrinks inward along the thickness direction.The displacement of the two ends is the largest,and the density is the highest.The center position in the middle is lower,and the edge in the middle is the lowest.The simulation results are consistent with the experimental results.
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