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在MMS-300热力模拟实验机上对一种含钛低合金超高强耐磨钢进行热模拟实验,研究了热变形奥氏体在连续冷却转变过程中的相变行为,建立了其连续冷却转变曲线(CCT曲线),观察了不同冷速下的组织变化情况,并探讨了精轧阶段变形量和变形温度对试验钢组织和性能的影响。结果表明,变形促进了先共析铁素体和珠光体的转变,缩短其孕育期,在一定程度上扩大了相变区域;采用较低(800℃)或较高(950℃)的精轧开轧温度以及较大的精轧累积变形量(50%)均能够得到较细的晶粒组织,有利于提高试验钢的强度和硬度。
On the MMS-300 thermal simulation experiment machine, a kind of titanium ultra-high strength wear-resistant steel containing titanium was simulated by thermal simulation. The transformation behavior of hot deformed austenite during continuous cooling transformation was studied. The continuous cooling transformation curve (CCT curve). The changes of microstructure under different cooling rates were observed. The effects of deformation amount and temperature on the microstructure and properties of the test steel were also discussed. The results show that the deformation promotes the transformation of proeutectoid ferrite and pearlite, shortens the incubation period and enlarges the phase transformation region to a certain extent. With the lower (800 ℃) or higher (950 ℃) finishing rolling The rolling temperature and the larger cumulative rolling deformation (50%) are able to get finer grains and improve the strength and hardness of the test steel.