【摘要】 采用铸渗工艺在45钢表面获得高碳铬铁铸渗层,通过改变铸渗合金粉末中Cr含量,研究了Cr含量对铸渗层组织及性能的影响。结果表明:铸渗层与基体呈良好的冶金结合,主要的碳化物有Cr₇C₃、Fe₃C、Cr₂₃C₇;并且随着Cr含量的增加,菊花状弥散分布的Cr₇C₃型碳化物明显增多,当合金粉末中铬含量为60%时,铸渗层硬度较高,此时铸渗层耐磨性能最佳,是基体的1.7倍。更多还原

【Abstract】 Cast-infiltrated layer with high chromium cast iron was prepared on surface of 45 steel by cast-infiltration process.Effect of Cr content on microstructure and mechanical properties of the high carbon ferrochrome cast-infiltrated composite layer was investigated by changing Cr content in the cast-infiltration alloy power.The results show that the cast infiltrated layer and the matrix have good metallurgical bonding.The main carbides are Cr₇C₃,Fe₃C and Cr₂₃C₇.With the increase of Cr content,the Cr₇C₃ type carbides dispersively distributed in the form of chrysanthemum obviously increases.When the Cr content in the alloying powder is 60%,hardness of the cast infiltrated layer is higher and the wear resistance is the best,which is about 1.7 times of that of the matrix.更多还原