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首页> 外文期刊>Materials Science and Technology >Microstructure evolution in AISI 304 stainless steel during near rapid directional solidification
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Microstructure evolution in AISI 304 stainless steel during near rapid directional solidification

机译：AISI 304不锈钢在近乎快速的定向凝固过程中的微观组织演变

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摘要

The microstructure evolution of near rapidly directionally solidified AISI 304 stainless steel was investigated in the present paper. It is found that the microstructure consists of δ ferrite dendrites with developed sidebranches and interdendritic austenite (γ) under the temperature gradient (G) of 20 K mm-1 and growth rate (V) of 1·0 mm s-1. Coupled growth microstructures of thin lamellar ferrite and austenite begin to form at a higher growth rate of 2·0 mm s-1. The formation mechanism of the coupled microstructures is analysed based on the nucleation and constitutional undercooling criterion that the δ ferrite phase and austenite phase form alternately before the steady state growth of each phase is reached due to larger undercooling. With further increase of the growth rate up to 3·0 mm s-1, the morphology of the δ ferrite transforms from lathy to cellular.
机译：本文研究了近快速定向凝固的AISI 304不锈钢的组织演变。结果表明，在20 K mm -1 的温度梯度（G）和生长速率（V）为1·0的条件下，该组织由具有较宽支化的δ铁素体枝晶和枝状奥氏体（γ）组成。毫米s -1 。薄层状铁素体和奥氏体的耦合生长组织开始以较高的2·0 mm s -1 生长速率形成。基于成核和本构过冷准则分析了耦合微结构的形成机理，该准则认为由于过大的过冷，δ铁素体相和奥氏体相在各相达到稳态生长之前交替形成。随着生长速率的进一步提高，达到3·0 mm s -1 ，δ铁素体的形态从板条状转变为细胞状。

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  • 来源
    《Materials Science and Technology》 |2009年第8期|1013-1016|共4页
  • 作者

    Fu J.W.; Yang Y.S.; Guo J.J.; Ma J.C.; Tong W.H.;

  • 作者单位

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China, Email: ysyang@imr.ac.cn;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

    Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;

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