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利用铸渗-热处理法将纯铬板与H7300进行原位反应制备了(Fe,Cr)_7C_3/Fe表面梯度复合材料。应用XRD、SEM和ML-100对1185℃保温不同时间所得的(Fe,Cr)_7C_3/Fe表面梯度复合材料的物相、显微组织和相对耐磨性进行了分析。结果表明:1185℃保温1h后生成的表面梯度复合材料的主要物相组成为(Fe,Cr)_7C_3、α-Fe、(Fe,Cr)_3C及未反应Cr,1185℃保温3 h后主要物相组成变为(Fe,Cr)_7C_3、α-Fe、(Fe,Cr)_3C以及(Fe,Cr)_(23)C_6;表面梯度复合材料表面显微组织由表面至基体呈梯度分布;在5 N载荷120目SiO_2两体磨料磨损下,(Fe,Cr)_7C_3/Fe表面梯度复合材料相对耐磨性有了明显提高,而陶瓷区的相对耐磨性最高,约为HT300的7倍。
The (Fe, Cr) _7C_3 / Fe surface gradient composites were prepared by in-situ reaction of pure chromium plate with H7300 by infiltration infiltration-heat treatment. The phase, microstructure and relative wear resistance of (Fe, Cr) _7C_3 / Fe surface gradient composites obtained at different temperatures of 1185 ℃ were analyzed by XRD, SEM and ML-100. The results show that the main phase composition of the surface graded composites formed after 1 h incubation at 1185 ℃ is (Fe, Cr) _7C_3, α-Fe, (Fe, Cr) _3C and unreacted Cr, (Fe, Cr) _7C_3, α-Fe, (Fe, Cr) _3C and (Fe, Cr) _ (23) C_6. The surface microstructure of the gradient composites was graded from the surface to the matrix. The relative wear resistance of (Fe, Cr) _7C_3 / Fe surface graded composites increased obviously with 5 N load 120 SiO_2 abrasive wear, while the relative wear resistance of ceramic area was the highest, about 7 times higher than that of HT300.