C-Mn-Al系TRIP钢连续冷却转变及组织研究
Research on Continuous Cooling Transformation and Microstructure of C-Si-Al TRIP Steel
马 海, 张宇光, 赵爱民, 唐 荻
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作者单位：北京科技大学 冶金工程研究院, 北京 100083
中文关键字：TRIP钢； 连续冷却转变曲线(CCT曲线)； 显微组织
英文关键字：TRIP steel; continuous cooling transformation curve (CCT curve); microstructure
中文摘要：采用热膨胀仪测定了C-Mn-Al系TRIP钢在不同冷速下连续冷却转变的膨胀曲线； 并运用Thermo-Calc软件，进行了C-Mn-Al系TRIP钢相变的理论计算。结合金相组织观察，研究了其连续冷却转变产物的组织形态。结果表明，当冷速>0.5 ℃/s时，组织由许多多边形先共析铁素体、少量珠光体和无碳化物贝氏体组成；冷速>5 ℃/s时，组织为铁素体和贝氏体；冷速>10 ℃/s时，开始出现马氏体和贝氏体的混合组织。
英文摘要：The CCT curves of C-Si-Al TRIP steel were measured under different cooling speeds using thermal simulator instrument DIL805A, the phase transition point of C-Mn-Al TRIP steel was calculated using Thermo-Calc software. According to metallographic analysis, the microstructure of the sample was researched. The results show that when the cooling rate is above 0.5 ℃/s, the microstructure is made up of abundance pro-eutectoid ferrite, a little pearlite and carbon-free bainite; while the cooling rate is above 5 ℃/s, ferrite and carbon-free bainite are obtained; there are martensite and bainite in microstructure at above 10℃/s.