潘睿,任瑞铭,陈春焕,陈煜达,赵秀娟

• 1:大连交通大学材料科学与工程学院
• 2:大连交通大学辽宁省轨道交通关键材料重点实验室

摘要(Abstract)：

用扫描电镜(SEM)对长期运行后的U71Mn钢轨踏面马氏体白层组织进行了分析。结果得出,曲线段钢轨踏面白层较直线段白层厚度深,硬度更高。随距表面距离增加,曲线段钢轨踏面白层内原奥氏体晶粒分别呈等轴状、长条状和非常细小的等轴状,原奥氏体晶粒内的马氏体形态随深度的增加,由以片状马氏体为主逐渐转变为以板条状为主的混合马氏体;而直线段钢轨踏面白层内原奥氏体晶粒均为长条状,且长轴方向平行于踏面,原奥氏体晶粒内为以板条状马氏体为主的混合马氏体。结合分析结果和可能的运行情况,作者认为,出现上述结果的主要原因是在钢轨使用过程中,由于蠕滑等原因造成表面温度急剧升高,超过了奥氏体的形成温度,使得组织中的碳化物发生不同程度的溶解,形成的奥氏体晶粒形状和大小,以及随后的快速冷却过程中得到的马氏体形态也与这种快速冷热循环有关。

关键词(KeyWords)： 钢轨;马氏体白层;摩擦磨损

Abstract:

Keywords:

基金项目(Foundation): 国家重点基础研究发展(“973”)规划(2015CB654802)

作者(Author): 潘睿,任瑞铭,陈春焕,陈煜达,赵秀娟

DOI: 10.13289/j.issn.1009-6264.2016.07.027

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