热处理对Fe-Cr-B铸钢组织和耐铝液腐蚀性能的影响  

Effect of Heat Treatment on Microstructure and Corrosion Resistance in Molten Aluminum of Fe-Cr-B Cast Steel

作　　者：陈维平[1] 刘路生[1] 张先满[2] 刘健[1] 

机构地区：[1]华南理工大学广东省金属新材料制备与成形重点实验室,广东广州510640 [2]海南大学机电工程学院,海南海口570228

出　　处：《铸造》2017年第1期58-63,共6页Foundry

基　　金：国家自然科学基金资助项目(51271080)

摘　　要：研究了不同去稳处理工艺对Fe-Cr-B铸钢显微组织及其耐铝液腐蚀性能的影响。结果表明:Fe-Cr-B铸钢凝固组织由网状M_2B型共晶硼化物和α-(Fe,Cr)基体组成;去稳处理后共晶硼化物连续性随温度升高而降低,且在900~1 050℃温度范围内处理时基体中析出细小弥散的M_(23)(C,B)_6和M_7(C,B)_3二次硼碳化物,其数量随着温度的升高逐渐减少。在900℃保温1.0 h时Fe-Cr-B铸钢获得最佳的耐铝液腐蚀性能;在750℃铝液腐蚀8.0 h条件下,经900℃和1 000℃保温1.0 h处理后的铸钢的腐蚀速率较铸态下分别降低了约25.1%和16.7%;Fe-Cr-B铸钢的耐铝液腐蚀性能受共晶硼化物及基体的耐铝液腐蚀性能的共同影响。The effects of different destabilization heat treatment processes on microstructure and corrosion resistance in molten aluminum of Fe-Cr-B cast steel were investigated. The results show that the solidified microstructure of Fe-Cr-B cast steel is composed of netlike eutectic M2B-type boride and a matrix of α-（Fe,Cr）. After destabilization, the morphology of eutectic boride becomes less continuous distribution with the increasing destabilization temperature. Moreover, fine dispersed M23（C,B）6 and MT（C,B）3 secondary borocarbides precipitate within the matrix when destabilized at 900-1 050 ℃, and the amount ofborocarbides decreases as the increasing of temperature. The optimum corrosion resistance in molten aluminum of Fe-Cr-B cast steel is obtained when destabilized at 900 ℃ for 1.0 h. Compared with the solidified cast steel, the corrosion rates of cast steels which are destabilized at 900 ℃ and 1 000 ℃ for 1.0 h are reduced about 25.1% and 16.7% respectively after immersed in molten aluminum at 750 ℃ for 8.0 h. Both the corrosion resistance of eutectic boride and the matrix can affect the corrosion resistance of Fe-Cr-B cast steel in molten aluminum.

关 键 词：Fe—Cr-B铸钢 去稳处理 显微组织 硼化物 铝液 腐蚀 

分 类 号：TG260[金属学及工艺—铸造] TG162.9