Microstructure evolution and densification behavior of TiC/316L composite powders during cold/warm die compaction and solid-state sintering: 3D particulate scale numerical modelling and experimental validation

材料科学 烧结 压实 微观结构 复合数 复合材料 粉末冶金 晶粒生长 粒子(生态学) 变形(气象学) 冶金 压力(语言学) 语言学 海洋学 哲学 地质学
作者
Defeng Wang,Xiaohan Liu,Meng Li,Jiale Lv,Xizhong An,Quan Qian,Haitao Fu,Hao Zhang,Xiaohong Yang,Qingchuan Zou
出处
期刊:Advanced Powder Technology [Elsevier BV]
卷期号:33 (8): 103667-103667 被引量:3
标识
DOI:10.1016/j.apt.2022.103667
摘要

To identify the microstructure evolution and densification behavior of TiC/316L composites in powder metallurgy (PM) process, 3D particulate scale numerical simulations were conducted to reproduce the cold/warm compaction and solid-state sintering of TiC/316L composite powders with corresponding physical experiments being carried out for model validation. The effects of compaction parameters and sintering temperature on the densification behavior of TiC/316L composite powders were systemically investigated. The particle deformation and morphology, stress/strain and microstructure evolutions, and grain size distribution in the whole process were characterized and compared to further illustrate the densification behavior and the underlying dynamics/mechanisms. The results show that compared with the cold compaction, the warm compaction can not only achieve higher relative density, smaller and more uniform equivalent stress, and weaker spring back effect, but also improve the friction condition among powder particles. The plastic deformation of 316L particles is the main densification mechanism during compaction. In the solid-state sintering of TiC/316L compacts, the densification is mainly indicated by shrinkage and vanishing of large residual pores along with the growth of the sintering necks, accompanied by the particle movement and growth along the boundary regions. Meanwhile, the particle displacement and grain size distribution are more uniform in the warm compacted TiC/316L component. Moreover, the equivalent (von Mises) stress in 316L particles is smaller than that in TiC particles.
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