热处理对Ti微合金钢组织性能的影响

Effect of Heat Treatment Process on Microstructure and Properties of Ti-microalloyed Steel

采用OM、SEM、拉伸及冲击试验等方法,对比研究了淬火温度对Ti微合金高强钢组织和性能的影响。结果表明,热处理后钢获得板条马氏体组织,随着淬火温度的升高,奥氏体化越充分,碳化物及合金元素溶解充分,强硬度增加;当加热温度过高,碳化物聚集长大,晶粒度过大,降低强硬度;冲击功随淬火温度升高则呈现下降趋势,即韧性降低。

Effect of quenching temperature on microstructure and properties of Ti-microalloyed high strength steel was investigated by means of optical microscope, scanning electron microscope, tensile and impact test. The results illustrate that lath-shaped martensite structure was obtained after heat treatment. Along with the rise of quenching temperature, austenitizing is more sufficient and carbide and alloy elements dissolve fully, which lead to the increasing of strength and hardness. However, when heat temperature is extremely high, carbides are accumulating and growing, and grain size is too big, which cause the decrease of strength and hardness. The impact energy shows downtrend with an increasing of quenching temperature.