【摘要】 采用扫描电镜、能谱仪和X射线衍射仪等分析手段,结合硬度测定和摩擦磨损实验,研究了一类基于Laves相强化的FeMo-Cr-Ni耐磨合金的成分及热处理工艺与组织性能之间的关系。结果表明,铸态合金为Laves+α-Fe(Mo,Cr,Ni)两相组织,主要呈魏氏体组织和枝晶组织两种类型,均匀化退火处理后魏氏体组织特征完全消失,随着Mo和Ni元素含量增加,沿Laves相边界逐渐析出χ相,淬火处理后,χ相析出量增加;铸态合金磨损机制为粘着磨损,退火态合金磨损机制为磨粒磨损;实验中Fe Mo25Cr14Ni10合金具有优异的组织与性能。更多还原

【Abstract】 Microstructure and properties of newly developed Fe-Mo-Cr-Ni wear resistance alloys based on Laves phase strengthened were investigated by means of scan electron microscope, energy disperse spectroscopy and X-ray diffractometer coupled with hardness measurement and wear experiments. The results indicate that as-cast alloys which consist of Laves phase and solid solution phase α-Fe( Mo,Cr,Ni) show characteristic widmanstatten microstructure and bulky dendrites. The character of widmanstatten microstructure disappeared after homogenization annealing,and χ phase precipitated along the boundaries of Laves phase as the increase of Mo and Ni content. The amount of the χ phase increases further after quenched. The wearing mechanism of as-cast alloys is adhesive wear,while for annealing alloys it is abrasive wear. The Fe Mo25Cr14Ni10 alloy exhibits the best microstructure and properties.更多还原