利用光学显微镜(OM)、扫描电镜(SEM)等研究了Ti含量对700 MPa级汽车大梁钢奥氏体晶粒长大和析出相的影响.结果表明,添加Ti后的实验钢中主要析出相由单一NbC转变为(Nb,Ti)C和Ti(C,N),随着Ti含量的增加,奥氏体晶粒得到有效细化.Thermo-calc热力学计算表明,钢中的(Nb,Ti) (C,N)和Ti(C,N)析出相析出温度比NbC明显提高,因而能够在更高温度下稳定存在并对晶界迁移起到抑制作用.用Beck方程对奥氏体晶粒的长大行为进行了描述,并给出了晶粒长大的数学模型.随着Ti含量的增加,Beck方程的时间指数n呈现降低趋势,但晶界生长的扩散激活能反而升高.Ti的碳氮化物对晶界的钉扎和拖曳效应是晶界迁移扩散激活能升高的主要原因.
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