SDC99钢淬火过程中应力和组织演变的有限元模拟

FEM simulation of the stress changing and phase transformation of the quenching process of SDC99 steel

为了研究钢铁材料在淬火过程中内部组织和应力的变化,以自主研发的SDC99钢为研究对象,考虑相变潜热的影响,采用有限元方法对偏心圆环的淬火过程进行模拟仿真,并对淬火过程中模型的温度场、应力场和组织场的变化进行分析和研究.结果表明:经实验测定淬火过程中温度场及残余应力的分布与模拟结果吻合较好,偏心圆环上最大残余应力出现在45°及315°位置;模型硬度的分布与其马氏体含量分布趋势一致,模拟的硬度值略小于实测值.

For the purpose of researching microstructure and residual stress changing process in quenching of metal material, taking a new developed steel SDC99 as the research object, FEM method is used to simulate the quenching process of eccentric circular model considering the influence of latent heat. Furthermore, the evolution of temperature field, stress field and phase field of the model during the quenching process are explored and evaluated in detail. Experimental results show that both the temperature field and the residual stress distribution obtained from numerical simulation fit well with the experimental value. The maximum residual stresses of the eccentric circular are at the locations with angles of 45° and 315°. The hardness distribution is consistent with the distribution of martensite, while the hardness value obtained from simulation is slightly less than the measured one.