利用动力学软件Dictra中的单相扩散模型模拟计算耐蚀合金与碳钢热等静压扩散焊接结合界面附近的元素浓度分布,并根据热力学相图计算建立获得扩散反应层内微观组织与界面元素浓度分布之间的关系.计算结果表明:该模拟方法能够准确描述热等静压扩散焊接过程中的元素浓度分布规律,同时能够预测扩散反应层内的微观组织变化.在此基础上,利用这一模型计算得出温度和时间对扩散焊接过程中元素互扩散规律的影响,结合元素扩散距离与界面结合质量之间的关系,得到耐蚀合金与碳钢可以实现界面良好结合的工艺条件:1050℃/200MPa/2.5～3h,1100℃/200MPa/1h,1150℃/200MPa/0.5h等.
The elements distribution near interface during hot isostatic pressing (HIP) and diffusion bonding was simulated with DICTRA by signal phase model, and the relation between microstructure in diffusion reaction layer and elements distribution was constructed by equilibrium phase diagram calculation. The comparison between experimetal and calculated results indicated that the simulation model and equilibrium phase diagram calculation can exactly describe the elements distribution law and predict microstructure variation near interface. Morever, the influence of temperature and time on element distribution law were simulated.According to the relations between element diffusion distances and interface bonding quality, a series of proper processing parameters were obtained, including 1050℃/200MPa/2.5-3h,1100℃/200MPa/1h,1150℃/200MPa/0.5h et al.
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