PHASE SELECTION OF AISI 304 STAINLESS STEEL DURING DIRECTIONAL SOLIDIFICATION
Solidification sequence of AISI 304 stainless steel influences the microstructures which determine the mechanical properties and corrosion resistance of the alloy. This paper studies phase/microstructures selection of directionally solidified AISI 304 stainless steel based on the interface response function (IRF) model to predict the primary phase during directional solidification. With the criterion of the highest interface temperature and the IRF model for single phase growth, the interface response functions of δ phase and y phase are calculated. It is found that the competitive growth between the stable phase (δ) and metastable phase (γ) exists during solidification process due to different solidification conditions. For the AISI 304 stainless steel calculated, metastable phase (γ) dendrites begin to precipitate as a primary phase when the growth rate is greater than 4.2cm/s at a given temperature gradient (G) of 400K/rnm. The influence of temperature gradient on the critical growth rate (Vc) from planar to cellular and the interface temperatures in the directionally solidified AISI 304 stainless steel is analyzed as well.
Stainless steel Directional solidification Phase selection Interface responsefunction
Junwei FU Yuansheng YANG Jianchao MA Wenhui TONG Jingjie GUO
Institute of Metal Research, Chinese Academy of Sciences Shenyang, 110016, China School of Materials Institute of Metal Research, Chinese Academy of Sciences Shenyang, 110016, China School of Materials Science and Engineering, Harbin Institute of Technology Harbin, 150001, China
国际会议
大连
英文
275-280
2007-08-19（万方平台首次上网日期，不代表论文的发表时间）