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通过Nb-V复合微合金化钢奥氏体连续冷却过程的热模拟试验,结合显微组织观察和显微硬度测试,综合分析了冷却速度对实验钢相变及组织的影响。结果表明,Nb-V复合微合金化低合金钢的临界淬火速度约为23℃/s;随着冷却速度的增大,相变开始温度和结束温度均有所下降,在低冷速区间会出现魏氏组织,在高冷速区间出现马氏体和贝氏体双相组织,晶粒明显细化。
Through the thermal simulation of the austenite continuous cooling process of the Nb-V composite microalloyed steel, the influence of the cooling rate on the phase transformation and microstructure of the experimental steel was analyzed based on the microstructure observation and the microhardness test. The results show that the critical quenching speed of Nb-V composite microalloyed low-alloy steel is about 23 ℃ / s. With the increase of cooling rate, the initial temperature and the end temperature of phase transformation decrease, Widmanstatten appeared in the high cooling rate appeared martensite and bainite dual-phase structure, the grain was significantly refined.