摘要
采用ProCAST对ZL102(L)/6061(S)液-固双铝合金复合铸件的铸造过程进行了仿真模拟,研究了充型和凝固过程中铸型内部的温度分布对凝固组织及双金属结合界面的影响,并采用真空压力铸造实验进行验证。模拟结果表明,ZL102铝液与固体6061铝管的双金属复合界面上构建出从底部至顶部温度逐渐升高,冷却速率逐渐增大的温度梯度场。验证实验发现,双金属复合铸件沿温度梯度方向存在宏观界面移动和Al、Si元素的扩散迁移,由此优化得到了具有良好结合界面的工艺参数,即铝液填充完成时初始温度637℃,冷却速率13℃/min至580℃保温2h.采用优化后的工艺参数制备出的双金属复合铸件在全区域内无明显的孔洞、夹杂等铸造缺陷。本研究揭示了液态金属浇注后的初始温度和冷却速率是调控固液双金属复合铸造界面结合质量的关键参数,为优化该工艺的界面性能提供了系统的工艺优化策略与理论依据。
The casting process of ZL102(L)/6061(S)liquid-solid bimetallic aluminum alloy composite castings was simu⁃lated using ProCAST.The effects of temperature distribution within the mold on the solidification structure and bimetallic bonding interface during filling and solidification were investigated and validated through vacuum pressure casting experiments.Simulation results indicate that a temperature gradient field,characterized by a gradual increase in temperature and cooling rate from the bot⁃tom to the top,forms at the bimetallic composite interface between the ZL102 and the 6061 tube.Experimental validation revealed macroscopic interface movement and diffusion of Al and Si elements along the temperature gradient.The optimal process param⁃eters for achieving a well-bonded interface were determined:an initial aluminum melt temperature of 637℃during filling,fol⁃lowed by a controlled cooling rate of 13℃/min down to 580℃,maintained for 2 h.Bimetallic composite castings fabricated using the optimized process parameters exhibited no significant casting defects,such as voids or inclusions,across the entire sample.
作者
赵宁宁
杨威
楼玉民
鲍听
王培生
岳建岭
杨锋
ZHAO Ning-ning;YANG Wei;LOU Yu-min;BAO Ting;WANG Pei-sheng;YUE Jian-ling;YANG Feng(Zhejiang Energy Technology Research Institute Co.,Ltd.,Hangzhou Zhejiang 311121,China;Key Laboratory of Energy Conservation&Pollutant Control Technology for Thermal Power of Zhejiang Province,Hangzhou Zhejiang 311121,China;Powder Metallurgy Research Institute,Central South University,Changsha Hunan 410083,China;Zhuzhou CRRC Intelligent Equipment Co.,Ltd.,Zhuzhou Hunan)
出处
《铸造设备与工艺》
2025年第2期32-37,共6页
Foundry Equipment & Technology
基金
燃气轮机热端部件新型热障涂层材料开发与应用(31901023007)
湖南省自然科学基金项目(2023JJ30690)。
作者简介
赵宁宁(1970年-),男,江苏苏州人,高级工程师,主要研究方向为电站高温高压部件长期运行后的蠕变与失效预防措施;通讯作者:杨威(1996年-),男,河南周口人,博士研究生,主要从事先进金属基复合材料研究工作。
