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采用一种新方法——高温应力法配合电镜萃取复型观察,来跟踪添加不同微量Ti的15MnVN钢在不同固溶处理温度,不同形变速率和不同冷却条件下的析出强化效果.结果表明,采用高温应力法检测沉淀相析出是比较灵敏的,在峰值应力附近观察到了大量的析出。15MnVN钢的峰值应力在650℃左右,微Ti钢中的峰值应力在750℃左右。0.027％Ti钢在3℃/s,15MnVN钢、0.013％Ti和0.039％Ti铜在2℃/s冷速下分别具有最大的沉淀强化效果。
A new method, high temperature stress combined with SEM observation, was used to trace the precipitation hardening effect of 15MnVN steel with different Ti additions at different solution treatment temperature, different deformation rate and different cooling conditions.The results showed that the use of Precipitation phase precipitation is sensitive to high temperature stress, with a large amount of precipitation observed near the peak stress. The peak stress of 15MnVN steel is about 650 ℃ and the peak stress of micro-Ti steel is about 750 ℃. 0.027% Ti steels have the greatest precipitation strengthening effect at 3 ℃ / s, 15MnVN steel, 0.013% Ti and 0.039% Ti copper at 2 ℃ / s.