通过试验研究了FeMnC系TWIP钢的拉伸应变硬化行为。结果表明：试验钢在拉伸过程中的应变硬化表现为阶段性多n值行为。其应变硬化机制有两种：在0.4%～3%的应变区间为位错强化阶段，10％～50%的应变区间为孪晶强化阶段。在这两个区间内n值皆为定值，而在4％～10％的应变区间n值呈不断上升趋势。
The strain hardening behaviour of FeMnC TWIP steel was investigated. It was showed there existed different n values in different phases during the tensile strain hardening of samples. There were also two strain hardening mechanisms: in the region of 0.4%3% strain, samples were strengthened by dislocation piling, but in the region of 10%50% strain, by twinning. In these two regions, the n value kept constant, However, n increased continuously in the region of 4%10%. The microstructure observation showed that the fractures of the FeMnC TWIP steel were typical ductile fracture pattern.
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