摘要
建立了单晶高温合金叶片定向凝固过程的微观组织演变模型,对不同工艺条件下的DD10合金单晶叶片的凝固过程进行了模拟,得到了抽拉速率和加热区温度对糊状区形貌、纵向温度梯度、冷却速率和微观组织的影响。结果表明:随着抽拉速率的增大,液/固界面的位置向下移动,糊状区宽度逐渐增大,冷却速率和纵向温度梯度逐渐增大,同时叶片上杂晶数目逐渐增多。加热区温度对液固界面位置、冷却速率、纵向温度梯度的影响与抽拉速率有相同的影响规律,而对糊状区宽度的影响则相反。模拟结果表明,浇注温度1520℃、上下加热区温度分别为1480和1500℃、变速抽拉速率为3-2-3 mm/min时可形成完整的单晶。
The microstructural evolution model of single crystal superalloy blades during directional solidifica-tion was established,and the solidification process of single crystal blades of DD10 alloy under different process con-ditions was simulated.The effects of drawing rate and heating zone temperature on the morphology of paste zone,longitudinal temperature gradient,cooling rate and microstructure were obtained.The results show that with the increase of drawing rate,the position of liquid/solid interface moves downward,the width of paste zone increases gradually,the cooling rate and longitudinal temperature gradient increase gradually,and the number of impurity crystals on the blade increases gradually.The effect of heating zone temperature on the position of liquid-solid in-terface,cooling rate and longitudinal temperature gradient is the same as that of drawing rate,but the effect on the width of paste zone is opposite.The results show that complete single crystals are formed when the pouring temper-ature is 1520℃,the temperature of upper and lower heating zone is 1480℃and 1500℃respectively,and the drawing rate is 3-2-3mm/min.
作者
王泽凯
徐宁
王超南
刘华
曹江海
李继伟
Wang Zekai;Xu Ning;Wang Caonan;Liu Hua;Chao Jianghai;Li Jiwei(Western Titanium Industry Co.,Ltd.,Xi'an 710201,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819 China;Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)
出处
《特钢技术》
2025年第3期17-21,共5页
Special Steel Technology
关键词
单晶叶片
定向凝固
抽拉速率
加热区温度
数值模拟
single crystal blade
directional solidification
drawing rate
heating zone temperature
numerical simulation
