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针对超级贝氏体钢中残留奥氏体组织对钢的强韧性贡献,设计了试验用钢60Mn2SiCr。通过对样品完全奥氏体化后不同温度和时间的等温处理,并通过SEM、TEM和MAUD软件分析了在超级贝氏体组织中残留奥氏体的存在、分布及数量。结果表明,残留奥氏体以薄膜状分布在贝氏体铁素体条束之间或针片内部;随等温温度的变化,其数量存在极值现象,在钢的Ms点稍上温度等温处理,可以获得残留奥氏体体积分数极大值为17.64%。此时,钢的强度为1930 MPa,伸长率7.44%,断面收缩率15.66%,具有良好的强韧性配合。
In view of the contribution of residual austenite in super bainitic steel to the toughness of steel, 60Mn2SiCr steel was designed. The existence, distribution and amount of retained austenite in super-bainite were analyzed by SEM, TEM and MAUD software after the samples were completely austenitized at different temperature and time. The results show that the retained austenite is distributed in thin film between the bainite ferrite bars or inside the needle. The extremum phenomenon exists with the change of isothermal temperature, the temperature of Ms is slightly higher than the temperature, The maximum value of retained austenite volume fraction is 17.64%. At this point, the steel strength of 1930 MPa, elongation of 7.44%, cross-sectional reduction rate of 15.66%, with good toughness with.