一种铸造镍基高温合金的显微组织和冲击性能  

Microstructure and impact property of a cast nickel-base superalloy

作　　者：周丽[1] 逯红果 马中钢 刘洪平 殷凤仕[3] 李道乾 ZHOU Li;LU Hongguo;MA Zhonggang;LIU Hongping;YIN Fengshi;LI Daoqian(School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255049,China;Shandong Ruitai New Material Technology Company Limited,Zibo 256100,China;School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学化学化工学院,山东淄博255049 [2]山东瑞泰新材料科技有限公司,山东淄博256100 [3]山东理工大学机械工程学院,山东淄博255049

出　　处：《山东理工大学学报（自然科学版）》2021年第6期24-26,共3页Journal of Shandong University of Technology:Natural Science Edition

基　　金：国家重点研发计划项目(2018YFB1106600);山东省重点研发计划项目(2019JZZY010332);淄博市“双十”计划项目(2019SS090001)。

摘　　要：通过金相显微镜、扫描电镜研究了试验K4648合金的显微组织及其冲击断口形貌,并分析了试验合金冲击吸收功偏低的原因。结果表明:试验K4648合金试棒经过1 180℃×4 h空冷+900℃×16 h空冷热处理后,显微组织由γ基体和在γ基体上析出的捆编织针状α-Cr相和细小颗粒状M23C6型碳化物以及分布在晶界和枝晶间的初生链状分布的较大尺寸α-Cr相组成。初生链状α-Cr相是造成试验K4648合金冲击吸收功偏低的主要原因。The microstructure and impact properties of a test cast nickel-base superalloy K4648 was studied by metallographic microscope and scanning electron microscope, and the cause of the low impact absorbed energy for the test alloy was analysed. The results show that after heat treatment of 1 180 ℃×4 h air cooling + 900 ℃×16 h air cooling, the microstructure of the test alloy consisted of the γ matrix, the bundle knitting acicular α-Cr phase and fine granular M23C6 carbide precipitated from the γ matrix as well as the primary large-size α-Cr phase which was distributed in a chain along grain boundaries and dendrites. It is the primary chain-like large-size α-Cr phase that causes the low impact absorbed energy for the test alloy.

关 键 词：镍基高温合金 K4648 Α-CR相 冲击吸收功 

分 类 号：TG156.1[金属学及工艺—热处理]