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首页> 外文期刊>Materials Science and Technology: MST: A publication of the Institute of Metals >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 (y) 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 5 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:研究了接近快速定向凝固的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1.0 mm s〜(-1)的生长速率(V)的作用下,组织由δ铁素体枝晶和侧枝和枝状奥氏体(y)形成。 )。薄层状铁素体和奥氏体的耦合生长组织开始以较高的生长速率2.0 mm s〜(-1)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,由于较大的过冷,在各相达到稳态生长之前,铁素体5相和奥氏体相交替形成。随着生长速率进一步提高到3.0 mm s〜(-1),δ铁氧体的形态从片状转变为细胞。

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