斯松华,魏海波,罗晓宇,杨帆

• 1:安徽工业大学材料科学与工程学院

摘要(Abstract)：

利用X射线衍射仪(XRD)、光学显微镜(OM)、扫描电镜(SEM)、高温抗氧化试验以及高温热疲劳试验等研究了3种镍含量不同(0.65%、1.5%和3.05%)的高铬铸铁组织结构以及耐热性能。结果表明：3种高铬铸铁的物相均为奥氏体、马氏体和(Cr, Fe)_7C_3碳化物，镍含量的增加使得奥氏体含量增加，马氏体含量减少。高铬铸铁组织结构均由先共晶树枝晶以及枝晶间的共晶组织构成，镍含量的增加使得树枝晶粗化，共晶组织得到了细化。在高温抗氧化试验中，随着镍含量的增加，高铬铸铁的氧化增重减少，氧化层厚度减薄。3种高铬铸铁的氧化层都有内外两层，含0.65%和1.5%镍的高铬铸铁的外层主要元素是O和Fe,内层主要元素是O和Cr;含3.05%镍的高铬铸铁的外层主要元素是O和Cr,内层主要元素是O和Fe。高温热疲劳试验中，3种高铬铸铁的主裂纹均沿着V型缺口延展而出，随着镍含量的增加，主裂纹的长度减少。含3.05%镍的高铬铸铁的抗热疲劳性能比含0.65%镍的高铬铸铁提高了36%。

关键词(KeyWords)： 镍;高铬铸铁;组织结构;耐热性能

Abstract:

Keywords:

基金项目(Foundation): 安徽省高校自然科学研究重大项目(KJ2021ZD0040);; 安徽工业大学校级大学生创新创业训练计划项目(2023009Y)

作者(Author): 斯松华,魏海波,罗晓宇,杨帆

DOI: 10.13289/j.issn.1009-6264.2023-0526

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