纳米多晶强化K4169合金的组织和力学性能  

Microstructure and properties of K4169 superalloy with nano polycrystalline reinforcement

作　　者：李亚敏[1] 周生睿 胡伟[1] LI Ya-min;ZHOU Sheng-rui;HU Wei(State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China)

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2021年第4期1-5,共5页Journal of Lanzhou University of Technology

摘　　要：采用手工电弧炉熔炼、水冷铜模冷却制备了K4169合金.利用X射线衍射、扫描电镜、透射电镜等对铸态及标准热处理态合金的组织进行了研究,并对标准热处理态合金的力学性能进行了测试.结果表明:铸态K4169合金为非晶-纳米晶材料,晶内析出相非常细小,小于10 nm;合金经标准热处理后,γ″相和γ′相以纳米多晶的形式析出;由于纳米多晶的强化作用,合金的断裂强度σb达到了1203.91 MPa,屈服强度σ0.2为818.93 MPa,延伸率δ为16.8%,硬度则达到了112.4 HRB,合金拉伸断口特征符合韧性断裂机制.A manual electric arc furnace and water-cooled copper mould were used to prepare superalloy K4169.The microstructure of the alloy as-cast and standard heat treatment was examined by XRD,SEM,TEM,and the mechanical properties of the standard heat treated alloy were tested.The results show that as-cast K4169 alloy is amorphous-nanocrystalline material,the precipitation in grain is very fine and smaller than 10nm.Theγ″andγ′phase are precipitated as nano polycrystalline after standard heat treatment the alloy.Because of the reinforcement by nano polycrystalline,the fracture strengthσb of alloy can reach 1203.91 MPa,and the yield strengthσ0.2 is 818.93 MPa,while the elongationδis 16.8%,and the hardness reaches 112.4 HRB,and the tensile fracture characteristics conform to the ductile fracture mechanism.

关 键 词：K4169高温合金 组织 纳米多晶 力学性能 拉伸断口 

分 类 号：TG132.2[一般工业技术—材料科学与工程]