Co-Ni-Al-Ti基高温合金的蠕变组织与性能研究  

Study on creep microstructure and properties of Co-Ni-Al-Ti based superalloys

作　　者：高秋志 杨越 孙林林 马庆爽 余黎明[3] 张竟文 李会军 GAO Qiuzhi;YANG Yue;SUN Linlin;MA Qingshuang;YU Liming;ZHANG Jingwen;LI Huijun(School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;School of Materials Science&Engineering,Tianjin University,Tianjin 300354,China;Faculty of Engineering and Information Sciences,University of Wollongong,Wollongong NSW 2522,Australia)

机构地区：[1]东北大学秦皇岛分校资源与材料学院,秦皇岛066004 [2]东北大学材料科学与工程学院,沈阳110819 [3]天津大学材料科学与工程学院,天津300354 [4]伍伦贡大学工程与信息科学学部,澳大利亚伍伦贡NSW 2522

出　　处：《有色金属材料与工程》2024年第5期1-9,32,共10页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(52171107,52201203);驻冀高校与石家庄市产学研合作项目(241791237A)。

摘　　要：对新型钴基高温合金进行成分调控,使用Ni、Ti、Cr、Mo等元素替代W以降低合金密度。对不同时效温度和蠕变温度下的2Cr合金和2Mo合金的蠕变性能进行了研究。使用JMatPro软件计算了两种合金的平衡相图,利用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射仪(X-ray diffractometer,XRD)、透射电子显微镜(transmission electron microscope,TEM)等实验设备对两种合金蠕变断裂前后的微观组织和断口进行观察。实验结果表明,经过时效处理的2Cr合金的蠕变性能优于未时效处理样品的。2Cr合金和2Mo合金在蠕变温度为700℃时表现出相对较长的蠕变寿命,在750℃时蠕变寿命急剧下降。由于2Cr合金的抗氧化性更强,使得2Cr合金相较于2Mo合金蠕变寿命的降低幅度更小。蠕变断裂以后,2Cr合金中的γ′相粗化程度更严重,2Mo合金中的γ′相更稳定。Control the composition of the novel Co-based superalloy by using elements such as Ni,Ti,Cr,Mo instead of W to reduce the alloy density.The creep properties of 2Cr and 2Mo alloys at different aging temperatures and creep temperatures were studied.The equilibrium phase diagrams of two alloys were calculated using JMatPro software,and the microstructure and fracture surface of two alloys before and after creep fracture were observed using experimental methods such as scanning electron microscope(SEM),X-ray diffractometer(XRD),transmission electron microscope(TEM).The experimental results show that the creep properties of 2Cr treated with aging is better than that of the untreated sample.2Cr and 2Mo alloys exhibit relatively long creep life at a creep temperature of 700°C,and the creep life sharply decreases at 750°C.Due to the stronger oxidation resistance of 2Cr alloy,the decrease in creep life of 2Cr alloy is smaller compared to 2Mo alloy.After creep fracture,the degree of coarsening of theγ′phase in 2Cr alloy is more severe,while theγ′phase in 2Mo alloy is more stable.

关 键 词：钴基高温合金 蠕变 微观组织 γ′相粗化 晶界 

分 类 号：TG132.3[一般工业技术—材料科学与工程]