周荣锋,陈华,王铁旦,张玲,蒋业华,周荣

• 1:昆明理工大学分析测试研究中心
• 2:昆明理工大学材料科学与工程学院
• 3:昆明理工大学机电工程学院

摘要(Abstract)：

借助金相显微镜、SEM、XRD、EDS对凝固过程中的30 mm×150 mm过共晶高铬铸铁试样通以电流强度为2000 A、频率为20 Hz的脉冲电流,对碳化物的形态、尺寸和种类进行分析研究。结果表明,脉冲电流作用下,高铬铸铁中碳化物尺寸显著减小,一部分杆状初生碳化物完全分解小片状,一部分初生碳化物局部溶解成2～3μm细小球状和絮状碳化物。剩余液相共晶反应获得的共晶团较常规铸态时的更加细密。脉冲电流作用下铸铁中碳化物不再为单一的M7C3型,同时出现了MC型、M7C0.45型、M23C6型等新类型的碳化物。

关键词(KeyWords)： 过共晶高铬铸铁;脉冲电流;碳化物;形貌

Abstract:

Keywords:

基金项目(Foundation): 高等学校博士学科点专项科研基金(20060674002);; 云南省中青年学术和技术带头人后备人才培养基金(2009CI024)

作者(Author): 周荣锋,陈华,王铁旦,张玲,蒋业华,周荣

DOI: 10.13289/j.issn.1009-6264.2011.07.012

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