一种低碳含钒超高强高锰TRIP钢组织性能的研究

Microstructure and mechanical properties of a low-carbon V-containing high-manganese high strength TRIP steel

为获得具有优异强塑性匹配的高锰TRIP钢,对固溶处理的低碳含钒高锰钢采用不同压下率的冷轧及600℃低温退火处理,利用微观分析和性能测试手段对其微观组织演变和力学性能进行了研究。结果表明,冷轧压下率对低温退火后的低碳含钒高锰钢微观组织和力学性能有重要影响。随着冷轧压下率的增加,该钢低温退火后的晶粒尺寸减小,奥氏体含量增加,马氏体含量减少,其抗拉强度和屈服强度也随之提高。当冷轧压下率为50%时,该钢低温退火后可获得高强度以及低屈强比,其强塑积可达39.6 GPa·%,主要强化方式为细晶强化、析出强化以及γ→ε-M和ε-M→α′-M相变强化。

To obtain high manganese transformation-induced plasticity(TRIP) steel with excellent strong product of strength and elongation, a low-carbon V-containing high-manganese steel was treated by low-temperature annealing at 600 ℃ which had been cold rolled with various rolling reduction ratios after solution-treated. The microstructure and mechanical properties of the experimental steel were studied by means of microscopic analysis and tensile test. The study show that cold rolling reduction ration strongly affects the microstructure and properties of the experimental steel after low-temperature annealing. Increasing the cold rolling reduction ratio, the grain size of the experimental steel will decrease, while the austenite content increase and the martensite content decrease, the tensile strength and yield strength will also increase. When the cold rolling reduction ratio is 50%, the high strength and low yield ratio of the experimental steel are obtained after annealing, and the product of strength and elongation reach 39.6 GPa·%. Its main strengthening mechanisms are grain refinement, γ→ε-M and ε-M →α′-M’ phase transformation and precipitation hardening.