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以铁基合金粉(G302)和石墨粉(C)为原料,利用氩弧熔覆技术在Q235钢表面原位合成了碳化铬增强铁基复合涂层并对涂层的组织和性能进行了表征。结果表明:涂层和基体结合良好,冶金反应比较充分;当粉末配比为G302∶C=50∶3时,涂层主要由(Cr,Fe)_7C_3、(Cr,Fe,Ni)相组成;随着石墨粉比例的增加,碳化物含量增加,当粉末配比为G302∶C=50∶4和G302∶C=50∶5时,涂层中出现了(Cr,Fe)_(23)C_6相,当G302∶C=50∶5时,初生碳化物呈现U型和刀状形态。涂层中碳化物增强相从底部到顶部不断增多,呈现梯度分布的特征。试样显微硬度从母材到涂层表面呈现梯度增长,粉末配比为G302∶C=50∶5时,涂层显微硬度可达950 HV0.1。
An iron-based alloy powder (G302) and graphite powder (C) were used as raw materials, and the chromium carbide reinforced iron-based composite coating was synthesized in-situ on Q235 steel by argon arc cladding technique. The microstructure and properties of the coating were characterized . The results show that the coating is well bonded with the matrix and the metallurgical reaction is sufficient. When the powder ratio is G302:C = 50: 3, the coating mainly consists of (Cr, Fe) _7C_3, (Cr, Fe, Ni) With the increase of the proportion of graphite powder, the content of carbides increases. When the ratio of powders is G302:C = 50: 4 and G302:C = 50: 5, (Cr, Fe) _ (23) C_6 When G302:C = 50: 5, primary carbides show U-shape and knife-like morphology. Carbide reinforcement phase in the coating from bottom to top increasing, showing the gradient distribution characteristics. The microhardness of the sample shows a gradient increase from the base metal to the coating surface. When the powder ratio is G302:C = 50: 5, the microhardness of the coating can reach 950 HV0.1.