赵志刚,仇圣桃,朱荣

• 1:北京科技大学冶金与生态工程学院
• 2:钢铁研究总院连铸技术国家工程研究中心

摘要(Abstract)：

在实验室条件下采用立式连铸的方法连铸φ100 mm M2钢,在扫描电镜下观察分析其碳化物的分布、形貌、尺寸和类型,研究了析出碳化物的演变规律,并对其在液相区、固-液两相区和固相区的析出规律进行了热力学计算。结果表明:φ100 mm M2钢连铸坯碳化物呈网状分布,网状碳化物的厚度从铸坯边部的1.5μm增大到中心的30μm,增大约20倍。碳化物形貌包括:块状、片层状和棒状,其中块状碳化物为VC,而片层状和棒状碳化物为M_2C。在液相和固-液两相区δ铁素体析出过程中,各种碳化物均不具备析出的热力学条件;在固-液两相区中γ奥氏体转变过程中,W_2C在1504 K具有析出的热力学条件;当温度降到固相线以下时,碳化物的析出顺序为VC>Mo_2C>W_2C,其析出温度分别为1475 K、549 K和333 K。

关键词(KeyWords)： M2钢;连铸;碳化物;热力学计算

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 赵志刚,仇圣桃,朱荣

DOI: 10.13289/j.issn.1009-6264.2016.07.035

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