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在Gleeble3500热模拟试验机上采用应力松弛的方法研究了Ti-Mo系高强钢在奥氏体区中的应变诱导析出行为。应力松弛结果表明,Ti含量的提高能明显增加其在奥氏体区中的析出动力学,且当Ti含量增加至0.27%时,Ti在奥氏体区中的析出存在两个鼻点温度区间,从而析出动力学更明显,更有利于纳米粒子在奥氏体的析出。对比研究了理论计算值和试验测定值,随着Ti含量的增加,无论是试验值,还是计算值,纳米粒子析出的开始温度和温度区间均有增大的趋势,且理论计算与试验测定值的误差逐渐变小。理论计算表明纳米粒子析出完成时间随着温度降低显著增加,且这种趋势相对于适当Ti含量(0.13%)来说明显小于过低Ti(0.05%)或过高Ti(0.27%)的情况。
The stress-induced precipitation behavior of Ti-Mo high strength steel in austenite region was investigated by using the stress relaxation method on a Gleeble3500 thermal simulator. The results of stress relaxation show that the increase of Ti content can obviously increase the precipitation kinetics in the austenite region. When the Ti content increases to 0.27%, the precipitation of Ti in the austenite region has two nasal temperature ranges , So the precipitation kinetics is more obvious, more conducive to the precipitation of nano-particles in the austenite. Compared with the calculated value and experimental value, with the increase of Ti content, both the experimental value and the calculated value, the starting temperature and the temperature range of the precipitation of nanoparticles tend to increase, and the theoretical calculation and experimental determination The error is getting smaller. Theoretical calculations show that the precipitation completion time of nanoparticles increases significantly with decreasing temperature, and this trend is obviously smaller than that of too low Ti (0.05%) or too high Ti (0.27%) relative to the appropriate Ti content (0.13%).