作　　者： ; ; ; ; ;

机构地区： 长春工业大学材料科学与工程学院

出　　处： 《焊接学报》 2005年第9期1-4,共4页

摘　　要： 应用有限元方法建立了超级钢焊接温度场的数学模型,对5 mm厚、400 MPa超级钢等离子弧焊接温度场和热循环进行了模拟和分析;利用模拟得到的热影响区热循环曲线,根据晶粒长大动力学原理对热影响区晶粒尺寸进行预测。预测结果表明,焊接接头热影响区宽度约为6.5 mm;焊接接头热影响区晶粒明显长大,最大晶粒尺寸约为180μm;焊接接头热影响区晶粒随冷却速度的加快而细化,但细化程度有限。 The welding temperature field of the ultrafine grain steel was computer simulated in this paper, and the thermal cycle curve was obtained. The grain size in HAZ was predicted based on the thermal cycle curve. The outcome of the prediction was in accordance with the outcome of the experiment. The heat affected zone (HAZ) is one of the main areas which affect the properties of welds. It is essential meaningful to complete the prediction of grain size by computer using proper methods and that can provide a new and important foundation for optimizing welding parameters and improving the quality of welds. The result showed that: (1) The width of the HAZ was about 6. 5 mm; (2) The grain size in HAZ increased obviously and the largest was 180 μm; (3) The higher the cooling speed was, the more refined the grain was, but the refined extent was relatively limited, not obvious.

关 键 词： 超级钢 热循环曲线 焊接热影响区 晶粒尺寸

领　　域： [金属学及工艺]