高强高韧低合金锰钢的研制

采用多元合金化思路设计了一种新型低合金高强度高韧性锰钢.研究了该钢的静态CCT曲线、显微组织、断口形貌以及热处理工艺对钢的力学性能的影响.结果表明:该钢中过冷奥氏体的稳定性高,具有高淬透性及高回火稳定性,经890～930℃淬火及200～230℃回火后获得回火板条马氏体组织,使该钢具有高的强韧性(抗拉强度Rm≥1500MPa,冲击韧性Akv≥85J)匹配;钢中适当提高锰含量,符合我国资源情况,具有较高的性价比.

Preparation of a high-strength and high-toughness low-alloy Mn steel

A new type of high-strength and high-toughness low-alloy Mn steel was designed by multi-element alloying. The static CCT diagram, microstructure, fracture morphology of the steel, as well as the effect of heat treatment on its mechanical properties, were studied. The results show that the stability of under-cooled austenite in the steel is excellent, which makes the steel have high hardenability and tempering stability. After being quenched at 890 to 930℃ and tempered at 200 to 230℃, the steel obtains tempered lath martensite which makes the steel the optimum combination of tensile strength R_m and impact toughness A_(kv) (R_m≥1500Mpa, A_(kv)≥85J). A good performance-price ratio was determined by properly increasing the content of Mn which is abundant in China.