蒋辉,赵爱民,裴伟,杨韶光,吴天宇

• 1:北京科技大学钢铁共性技术协同创新中心

摘要(Abstract)：

利用Linseis L78 RITA相变仪测定了低合金耐磨钢在不同冷却速率下的膨胀曲线，并结合金相、硬度检验绘制出试验钢的连续冷却转变曲线(CCT曲线),研究不同冷却速度对该钢组织转变的影响，利用VL2000DX高温激光共聚焦显微镜观察并分析了试验钢的马氏体相变过程。结果表明：试验钢的临界转变点A_(c1)为766℃,A_(c3)为825℃;当冷速为0.01～0.1℃/s时，试验钢的显微组织为粒状贝氏体；当冷速达到0.2℃/s时，组织为上贝氏体+少量马氏体。随着冷速增加到0.5℃/s,贝氏体组织几乎全部消失，取而代之的是马氏体组织，并且随着冷速的进一步增加马氏体板条更加明显。原位观察结果表明：马氏体优先在奥氏体晶界处形核，后转变的马氏体在先形成的马氏体界面上形核，两者之间具有一定位向关系。

关键词(KeyWords)： 低合金耐磨钢;CCT曲线;显微组织;马氏体相变

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 蒋辉,赵爱民,裴伟,杨韶光,吴天宇

DOI: 10.13289/j.issn.1009-6264.2022-0196

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