超高强度23Co14Ni12Cr3MoE钢的热变形行为研究

Hot Deformation Behavior of 23Co14Ni12Cr3MoE Ultra-High Strength Steel

利用Gleeble-3800热力模拟试验机,在1123～1423K温度范围,应变速率0.5～10s-1条件下,对二次硬化超高强度23Co14Ni12Cr3MoE钢进行了高温轴向压缩试验,测得了钢的高温流变曲线,并观察了变形后的显微组织。实验结果表明,该钢流变应力和峰值应变随着变形温度的升高和应变速率的降低而减小;在真应变为0.8,应变速率为0.5～10s-1的条件下,随着变形速率的提高,其发生完全动态再结晶的温度也逐渐升高。当变形速率为10s-1时,其变形温度高于1373K,才会发生完全动态再结晶。23Co14Ni12Cr3MoE钢的热变形激活能(Q)为421.6kJ/mol。本次研究还确立了钢的热变形方程。

The hot compression deformation behaviors of secondary hardening ultra-high strength 23Co14Ni12Cr3MoE steel with high strength and toughness were investigated by use of Gleeble-3800 simulator at the temperature range of 1123K to 1423K and at the strain rate of 0.5~10s-1.The corresponding flow curves were determined and hot deformed microstructures were observed.The results show that the flow stress and peak strain increase with increasing strain rate or decreasing deformation temperature.At true strain 0.8 and the strain rate of 0.5~10s-1,the temperature of full dynamic recrystallization increase with the strain rate rising.When the strain rate is 10s-1,the deformation temperature is beyond 1373K,the full dynamic recrystallization is occurred.The hot deformation activation energy Q of steel is 421.6kJ/mol,and the hot deformation equation is derived based on the experiments.