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通过Gleeble-3500热模拟试验机,结合热膨胀法、金相法及硬度法,研究了低碳硅锰钢连续冷却过程中组织形貌特征及形成机理。结果表明:在连续冷却过程中,冷速在0.5~10℃/s,出现呈块状或条状的铁素体;在0.5~30℃/s冷速,粒状组织、粒状贝氏体逐渐演变为板条贝氏体铁素体;在30~40℃/s,显微组织主要是板条马氏体及少量贝氏体,板条贝氏体铁素体显深褐色,板条马氏体显浅棕色。随连续冷却速度升高,试验用钢的显微硬度也随之升高。
By means of Gleeble-3500 thermal simulation tester, combined with thermal expansion method, metallography method and hardness method, the morphology and formation mechanism of low carbon Si-Mn steel during continuous cooling were studied. The results show that in the continuous cooling process, the cooling rate is 0.5 ~ 10 ℃ / s, and the massive or strip ferrite appears. At the cooling rate of 0.5 ~ 30 ℃ / s, the granular structure and granular bainite gradually evolve Is lath bainitic ferrite; at 30-40 ℃ / s, the microstructure is mainly lath martensite and a small amount of bainite, lath bainitic ferrite is dark brown, Body was light brown. As the continuous cooling rate increases, the microhardness of the test steel also increases.