Al对K4169合金铸态组织和力学性能的影响  

Effect of Al on Microstructure and Mechanical Properties of As-cast K4169 Alloy

作　　者：刘杰[1] 李亚敏[1] 刘洪军[1] 

机构地区：[1]兰州理工大学有色金属合金及加工教育部重点实验室,甘肃兰州730050

出　　处：《热加工工艺》2010年第11期37-39,43,共4页Hot Working Technology

基　　金：甘肃省自然科学基金项目(3ZS042-B25-028);兰州理工大学有色金属合金及加工教育部重点实验室开放基金(EKL07009)

摘　　要：采用手工电弧炉熔炼制备了不同Al含量的K4169高温合金。显微组织和力学性能研究表明:随着Al含量的增加,合金铸态组织的二次枝晶臂变得发达,枝晶间析出相增多,Nb、Mo、Ti和Fe元素在枝晶和枝晶间的偏析程度减轻;Al含量增加使得合金的屈服强度和硬度明显提高,当Al含量为1.25wt%时,其屈服强度和硬度达到最大值,但是Al含量增加至1.45wt%时,合金晶界上析出了大量的Laves相,反而降低了合金的屈服强度和硬度。K4169 Superalloy with different Al contents was prepared by arc melting in manual electric arc fumace. The studies of the microstmcture and mechanical properties show that with the increase of AI content, the secondary dendrite arms become well-developed, and the interdendritic precipitated phases increase. Meanwhile, the microsegregation of elements such as Nb, Mo, Ti and Fe abates. The yield strength and hardness obviously increases with the increase of Al, and reach the highest point when Al is above 1.25wt%, whereas, when the content of Al increases to 1.45wt%, the mass brittle Laves phases are formed in the grain boundaries, the yield strength and hardness decrease.

关 键 词：铸态组织 枝晶偏析 析出相 力学性能 二次枝晶臂 

分 类 号：TG146.1[一般工业技术—材料科学与工程]