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通过实验室模拟实际生产中的加热过程及单道次压缩热模拟试验,结合组织观察分析方法,回火硬度法研究了一种Nb-V-Ti微合金高强管线钢加热温度与奥氏体组织,合金元素溶解及析出的关系,并对不同温度加热后奥氏体的动态再结晶行为及其组织进行了研究。试验结果表明,随加热温度的升高,奥氏体晶粒尺寸逐渐增大,在1 200℃以上易出现粗大晶粒,加热温度过高形成的粗大奥氏体晶粒延缓了再结晶行为,容易造成混晶现象。
Through the laboratory simulation of heating process and single pass compression heat simulation experiment, combined with the microstructure observation and analysis method, the tempering hardness method was used to study the heating temperature and austenite structure of a Nb-V-Ti microalloyed high-strength pipeline steel , The dissolution and precipitation of alloying elements, and the dynamic recrystallization behavior of austenite and its microstructure after heating at different temperatures were studied. The experimental results show that with the increase of heating temperature, the grain size of austenite gradually increases, coarse grains appear easily above 1200 ℃, and the recrystallization slows down due to the coarse austenite grains formed by the heating temperature too high. Easy to cause mixed crystal phenomenon.