电感应再加热对低合金钢热轧组织影响的模拟

利用热模拟试验机Gleeble1500D研究了低合金钢变形后，冷却至一定温度进行电感应再加热后微观组织的变化情况.在不同冷却温度，以及淬火和正火两种热处理方式下，研究了再加热过程对微观组织的影响.结果表明:变形后再加热过程对淬火试样组织影响较大；冷却温度处于两相区时，电感应再加热过程能改善温度分布均匀性，影响铁素体相变过程和碳氮化物的析出行为，促进晶粒长大，能够有效地控制和改善淬火热处理钢材的微观组织和性能.

Simulation on Effect of Electric Induction Reheating on Microstructure of Hot Rolled Low Alloy Steel

The thermal simulator Gleeble 1500D was used to investigate the microstructure evolution of hot rolled low alloy steel during cooling and reheating. The effect of reheating process on microstructure was studied in the conditions of different cooling temperature， quenching and normalizing heat treatments， respectively. The results showed that the effect of the reheating process after rolling on the quenched steel sample is more remarkable than on normalized sample. When the deformed steel is cooled to two phase region， the reheating process improves the uniformity of temperature distribution， affects the phase transformation of ferrite and precipitation of carbonitrides， prompts the growth of grains， and effectively improves and controls the microstructure and mechanical properties of the quenched steels.