冷轧变形对叶轮机叶片Al-6.5Si-0.8Ti-xSi合金组织及力学性能的影响  

Effect of cold rolling deformation on microstructure and mechanical properties of Al-6.5Si-0.8Ti-xSi alloy for turbine-impeller blades

作　　者：范建华 徐艳萍 韩俊召 李明[4] Fan Jianhua;Xu Yanping;Han Junzhao;Li Ming(Department of Equipment Engineering,Henan Polytechnic of Architecture,Zhengzhou 450064,China;Department of Mechanical Engineering,Henan Economic and Trade Technician College,Xinxiang 453000,China;Zhejiang Tiangong Engineering Design Co.,Ltd.,Hangzhou 310002,China;School of Mechanical Engineering,Henan University of Science and Technology,Zhengzhou 446000,China)

机构地区：[1]河南建筑职业技术学院设备工程系,河南郑州450064 [2]河南经济贸易技师学院机械工程系,河南新乡453000 [3]浙江天功工程设计有限公司,浙江杭州310002 [4]河南科技大学机械工程学院,河南郑州446000

出　　处：《锻压技术》2024年第12期106-112,共7页Forging & Stamping Technology

基　　金：NSFC-河南联合基金重点项目(U1804254)。

摘　　要：对叶轮机叶片用Al-6.5Si-0.8Ti合金进行室温拉伸实验并对其进行表征,研究不同冷轧变形量和添加Si元素对合金组织演变及力学性能的影响规律。结果表明:合金基体组织中形成了大量的网状分布形态,经过550℃+1 h热处理后,观察不到白色初生相,对固溶初生相进行回溶使其重新与基体发生融合;Al-6.5Si-0.8Ti合金的硬度为90 HV,添加Si元素的合金试样则具有更高的硬度且时效析出速度明显提升。加入Si元素后可以起到明显细化效果,通过基体位错与析出相获得强化效果。持续退火后,基体中形成高密度位错,形成了粒径尺寸接近Φ150 nm的亚晶粒。该研究有助于提高铝合金的成形质量,为后续工艺优化提供参考。The room temperature tensile test of Al-6.5Si-0.8Ti alloy for turbomachine blade was conducted and characterized to study the influence laws of different cold rolling deformation amounts and addition of Si on the microstructure evolution and mechanical properties.The results show that a large number of network distribution patterns are formed in the matrix of alloy.After heat treatment of 550℃+1 h,no white primary phase is observed,and the solid solution primary phase is redissolved for fusion with the matrix.The rardness of Al-6.5Si-0.8Ti alloy is 90 HV,while the alloy specimen adding Si element has a higher hardness and the precipitation speed increases significantly.The addition of Si element achieves the significant refinement effect,and the strengthening effect is obtained through the matrix dislocation and precipitated phases.After continuous annealing,high density dislocations are formed in the matrix,resulting in the subgrains with a particle size close toΦ150 nm.The research is helpful to improve the forming quality of aluminum alloy and provide reference for subsequent process optimization.

关 键 词：Al-Si-Ti合金 冷轧 微合金化 微观组织 力学性能 

分 类 号：TG146[一般工业技术—材料科学与工程]