团球γ+(Fe,Mn)_3C/γ体钢基自生复合材料的组织与性能

Structure and Properties of In-situ Granular γ+(Fe,Mn)_3C Eutectics Reinforce Austenite Steel Matrix Composites

采用 Ca- Si合金变质处理钢液 ,通过影响钢液中 C、Mn等合金元素的偏析和相的生成 ,控制钢液凝固组织 ,在铸态下获得团球状共晶体增强奥氏体钢基自生复合材料 (EAMC) .该材料利用硬质相团球状 γ+(Fe,Mn) 3 C共晶体强化高韧性奥氏体基体 ,充分发挥基体、增强相的特性和两者的强韧性耦合 ,获得了优异的力学性能和耐磨性 .试验表明 ,在中、低载干磨损条件下 ,EAMC具有比奥氏体中锰钢优异的耐磨性能 .

A new type of in-situ granular γ+(Fe,Mn)3C binary eutectics reinforced austenite steel matrix composites (abbreviated in-situ EAMC) was prepared with Ca-Si agent modifying to control the solidification structure of steel in the as-cast state. The eutectic formed among the initial austenite dendrites results from the non-equilibrium solidification because the modifier enhances the segregation of C and Mn. In-situ EAMC has remarkable mechanical properties and wear resistance because the γ+(Fe,Mn)3C binary eutectic can strengthen the steel matrix greatly, and the latter can protect the former efficiently. The wear tests show that in-situ EAMC has better dry wear resistance than austenite medium Mn steel under low and medium loads.