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基于对以铁素体为基体,其上弥散分布颗粒状渗碳体的碳钢球化体(包括球状珠光体,回火屈氏体和回火索氏体等)在扫描激光束作用下组织转变过程及机理的探讨,建立了简明的相变硬化数理模型,并结合热学分析,用数值方法定量地计算了硬化层尺寸,以及热影响区内各组成相的体积分数,碳浓度和硬度分布.理论值与三种碳钢(20钢,T8钢和 T10钢)实际处理结果进行了比较,二者符合得较好.本文报道理论模拟方面的结果,理论与实验的比较分析将另文报道.
Based on the ferrite as a matrix, on which the diffuse distribution of granular cementite carbon steel spheroid (including spherical pearlite, temper and tempered martensite, etc.) under the action of the scanning laser beam tissue The transformation process and mechanism were discussed. A mathematical model of phase transformation hardening was established. Combined with thermal analysis, the size of hardened layer and the volume fraction, carbon concentration and hardness distribution of each phase in the HAZ were quantitatively calculated by numerical method .The theoretical value is compared with the actual treatment results of the three types of carbon steel (20 steel, T8 steel and T10 steel), the two are in good agreement.This paper reports the theoretical simulation results, the comparative analysis of theory and experiment will be reported separately .