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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Cr_7C_3、Fe_3C、Cr_(23)C_7;并且随着Cr含量的增加,菊花状弥散分布的Cr_7C_3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。
Casting infiltration process was used to obtain high-carbon ferrochrome cast-infiltrated layer on the surface of 45 steel. The effect of Cr content on the microstructure and properties of infiltrated infiltrated layer was studied by changing the Cr content in the infiltrated alloy powder. The results show that there is a good metallurgical bond between the infiltration and infiltration layer and the matrix, and the main carbides are Cr_7C_3, Fe_3C and Cr_ (23) C_7. With the increase of Cr content, the chrysanthemum distributed Cr_7C_3 carbides obviously increase. When the chromium content in the alloy powder is 60%, the hardness of the casting infiltration layer is high, and the wear resistance of the casting infiltration layer is the best at this time, being 1.7 times that of the matrix.