Fe-11Mn-4Al-02C钢的应变硬化行为

采用淬火-回火的新工艺，使冷轧实验钢Fe-11Mn在700~800℃淬火后得到铁素体和奥氏体的双相组织.通过拉伸实验可得实验钢抗拉强度达到920~1150MPa，延伸率达到35%~65%.通过XRD对试样拉伸变形前后的组织进行了分析，表明实验钢在拉伸过程中发生了TRIP效应.通过分析冷轧实验钢拉伸过程中的应变硬化行为，证明了合适的铁素体数量和奥氏体晶粒尺寸使奥氏体发生TRIP效应的时机最佳，从而得到优良的力学性能.

Strain Hardening Behaviors of Fe 11Mn 4Al 02C Steels

A new quenching tempering heat treatment method was adopted for the Fe 11Mn cold rolled steels which yielded a duplex microstructure consisting of ferrite and austenite when the samples were quenched in the range of 700~800℃， leading to good combinations of tensile strength(920~1150MPa)and elongation(35%~65%). The volume fraction of austenite of the cold rolled samples before and after the tensile tests was analyzed through XRD， and it was evidenced that TRIP effects occurred during the deformation. The strain hardening behavior during the tensile tests was studied. It proved that the optimized amount of ferrite and grain size of austenite made the TRIP effects occur at the appropriate time， therefore excellent mechanical properties were obtained.