型壳温度对DZ22B合金叶片枝晶组织的影响OACSTPCD
Effect of Shell Temperature on the Dendrite Structure of DZ22B Alloy Blade
以DZ22B镍基高温合金叶片为研究对象,采用ProCAST数值模拟及试验相结合的方法对不同型壳保温温度下铸造叶片定向凝固过程中的温度场、热裂倾向及组织进行研究.结果表明:随着型壳保温温度的增加,等温线整体呈下凹趋势,处于1 540℃温度下的糊状区下凹程度明显大于其他温度,且叶片HTI结果有所增加,容易产生热裂的区域集中在叶身上部,排气边位置容易产生热裂的区域比进气边更大;相同高度位置下的叶片排气边枝晶间距均小于进气边枝晶间距;随型壳保温温度升高,一次枝晶间距和二次枝晶间距均降低,对比模拟结果与试验统计得出的一次枝晶间距和二次枝晶间距,得出一致结论,模拟与试验吻合较好.
Taking DZ22B nickel-based superalloy blade as the object,the temperature field,hot tearing tendency and microstructure of the casting blade during directional solidification at different shell holding temperatures were studied by ProCAST numerical simulation and experiment.The results show that:with the increase of the holding temperature of the shell,the isotherm is concave as a whole.The concave degree of the mushy zone at 1 540℃is significantly greater than that at other temperatures,and the HTI results of the blade increase.The area prone to hot tearing is concentrated on the upper part of the blade,and the area prone to hot tearing at the exhaust edge is larger than that at the inlet edge.The dendrite spacing of the exhaust side of the blade at the same height is less than that of the inlet side.With the increase of the holding temperature of the shell,the primary dendrite spacing and the secondary dendrite spacing decrease.Comparing the simulation results with the experimental statistics of the primary dendrite spacing and the secondary dendrite spacing,the consistent conclusion is drawn,and the simulation is in good agreement with the experiment.
钟文惠;丁鹏飞;谢维;封举宁;王鑫铭;吴煜;刘艳
中国航发南方工业有限公司,湖南株洲 412000湘潭大学材料设计及制备技术湖南省重点实验室,湖南湘潭 411105||湘潭大学材料科学与工程学院,湖南湘潭 411105
金属材料
DZ22B高温合金定向凝固枝晶组织型壳温度数值模拟
DZ22B high temperature alloydirectional solidificationdendritic structureshell temperaturenumerical simulation
《铸造》 2024 (004)
489-497 / 9
国家自然科学基金面上项目(52171016);国家自然科学基金青年项目(52201023);省教育厅项目(21C0090).
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