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以建筑用6CrW2MoVSi钢为对象,研究了其在不同热处理条件下组织及硬度的变化规律。结果表明,经退火及淬火后,试验钢中组织细小均匀;在820℃退火后钢中碳化物尺寸约为0.6μm;经950℃淬火后,钢组织主要由板条马氏体和少量针状马氏体组成,其中针状马氏体尺寸小于2.5μm;随着淬火温度的升高,试验钢的淬火硬度上升;高温淬火后,试验钢在回火过程中出现两个回火沉淀硬化区;由不同温度下平衡相的含量变化可知,钢热处理时的非平衡相组成与其平衡态相比温度滞后,且高温处理可促进钢中相的平衡。
Taking 6CrW2MoVSi steel for construction as object, the change rules of its microstructure and hardness under different heat treatment conditions were studied. The results show that after annealed and quenched, the microstructure of the test steel is fine and uniform. The size of the carbide in the steel annealed at 820 ℃ is about 0.6μm. After quenching at 950 ℃, the microstructure of the steel mainly consists of lath martensite and a few acicular Martensite, needle acicular martensite size less than 2.5μm; with the quenching temperature increases, the quenched hardness of the test steel increases; high temperature quenching, the test steel in the tempering process two tempering precipitation hardening zone The change of the content of the equilibrium phase at different temperatures shows that the non-equilibrium phase composition during the heat treatment of the steel lags behind the equilibrium state, and the high-temperature treatment can promote the balance of the phases in the steel.