【摘要】 分析了传统的焊接热影响区 (HAZ)晶粒长大模型,在此基础上,介绍了适用于高强度管线钢的奥氏体晶粒长大的耦合模型。为了体现沉淀物粒子对晶粒长大的影响作用,该耦合模型通过引入一个变量 (限制晶粒尺寸 ),把晶粒长大过程和沉淀物变化过程进行充分耦合,建立了稳定沉淀物、沉淀物粗化和沉淀物溶解情况下的晶粒长大耦合方程,并且,可通过耦合模型建立的晶粒长大方程绘制晶粒长大图。更多还原

【Abstract】 In this paper,the traditional HAZ grain growth model is analyzed.Based on the model,analytical model of austenite grain growth fit to high strength pipe-steel is introduced.In order to present the important role of precipitates on grain growth,the two processes of grain growth and the precipitates varying is coupled step by step through introducing a variable(the limiting grain size)in the analytical model.The coupling equations of grain growth in presence of stable,growing and dissolving precipitates are established.By utilizing the equations,the maps of grain growth can be made.更多还原