Sintering behaviors of porous 316L stainless steel fiber felt
来源期刊：中南大学学报(英文版)2015年第3期
论文作者：FENG Ping(冯萍) 刘咏 WANG Yan(王岩) 李昆 ZHAO Xiu-yun(赵秀云) 汤慧萍
文章页码：793 - 799
Key words：316L stainless steel; fiber felt; sintering; activation energy; diffusion
Abstract: Isothermal sintering experiments were performed on the 316L stainless steel fiber felts with fiber diameters of 8 μm and 20 μm. Surface morphologies of the sintered specimens were investigated by using scanning electron microscopy (SEM) and optical microscopy. The results show that the amount of the sintering necks and the relative densities of the fiber felt increase with the increasing of both the sintering temperature and the sintering time. And the activation energies estimated present a decline at high relative densities for both 8 μm and 20 μm fiber felts. Moreover, the sintering densification of the fiber felts is dominated by volume diffusion mechanism at low temperature and relative densities. As more grain boundaries are formed at higher temperature and relative density, grain boundary diffusion will also contribute to the densification of the specimen.
FENG Ping(冯萍)1, LIU Yong(刘咏)1, WANG Yan(王岩)2, LI Kun(李昆)1, ZHAO Xiu-yun(赵秀云)1, TANG Hui-ping(汤慧萍)3
(1. State Key Laboratory of Powder Metallurgy (Central South University), Changsha 410083, China;
2. School of Aeronautics and Astronautics, Central South University, Changsha 410083, China;
3. State Key Laboratory of Porous Metal Materials
(Northwest Institute for Nonferrous Metal Research), Xi’an 710016, China)
Abstract:Isothermal sintering experiments were performed on the 316L stainless steel fiber felts with fiber diameters of 8 μm and 20 μm. Surface morphologies of the sintered specimens were investigated by using scanning electron microscopy (SEM) and optical microscopy. The results show that the amount of the sintering necks and the relative densities of the fiber felt increase with the increasing of both the sintering temperature and the sintering time. And the activation energies estimated present a decline at high relative densities for both 8 μm and 20 μm fiber felts. Moreover, the sintering densification of the fiber felts is dominated by volume diffusion mechanism at low temperature and relative densities. As more grain boundaries are formed at higher temperature and relative density, grain boundary diffusion will also contribute to the densification of the specimen.
Key words:316L stainless steel; fiber felt; sintering; activation energy; diffusion
