第三代镍基单晶高温合金大间隙钎焊接头的微观组织和力学性能  

Microstructure and mechanical properties of wide gap brazing joint of the third-generation nickel-based single crystal superalloy

作　　者：李可馨 侯星宇[2] 王诗洋 孙元[2] 陈立佳[1] 程陆凡[2] 王振江[2] 李寒松 汤广全 LI Kexin;HOU Xingyu;WANG Shiyang;SUN Yuan;CHEN Lijia;CHENG Lufan;WANG Zhenjiang;LI Hansong;TANG Guangquan(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China;Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai 200241,China;Liaoning Zhongke Boyan Technology Co.,Ltd.,Shenyang 113122,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016 [3]中国航发商用航空发动机有限责任公司,上海200241 [4]辽宁中科博研科技有限公司,沈阳113122

出　　处：《航空材料学报》2021年第5期78-85,共8页Journal of Aeronautical Materials

基　　金：国家自然科学基金青年项目(51801206);国家科技重大专项项目.(J2019-VI-0018-0133)。

摘　　要：采用混合粉末钎料钎焊第三代含铼单晶高温合金,其中混合粉末钎料是利用球磨混粉方法将一种镍基粉末钎料和母材成分相同的高温合金粉混合制成。利用SEM和EPMA分析镍基钎料与高温合金粉配比对接头微观组织的影响,并对四种钎料的钎焊接头进行高温持久性能测试。结果表明:采用镍基钎料的焊缝和混合粉末钎料的焊缝中均存在γ-Ni、γ′、γ+γ′共晶、CrB、Ni3B以及M_(3)B_(2)型硼化物,但混合粉末钎料的残留为熔化的球型高温合金;保持焊缝间隙不变,提高混合粉末钎料中高温合金粉末的配比,可以抑制焊缝中M_(3)B_(2)型硼化物和低熔点相的析出,且硼化物的分布变得更均匀,尺寸变得更小,提高了焊缝成分和组织的均匀性;3种接头的高温持久性能均优于纯钎料接头,当提升合金粉的比例由0%至50%时,接头的持久寿命由15 min提升至34 h,但当合金粉比例增加至60%时,接头中产生大量孔洞缺陷,导致持久寿命下降至4 h。In this study,the third-generation rhenium containing single crystal superalloy was brazed by mixed powder filler,in which the mixed powder filler was consisted of nickel-based powder filler and the superalloy powder with the same composition of the base metal.SEM and EPMA were used to analyze the influence of the proportion of the third-generation single crystal superalloy powder in the mixed filler on the microstructure of the joint,and the high temperature stress rupture properties of the brazed joint with four kinds of solder were tested.The result indicates that the microstructures and phase compositions of the Ni-based powder filler and mixed powder filler are both consisted of γ-Ni,γ′,CrB,Ni3B and M_(3)B_(2) type boride,but the residue of the mixed powder filler is molten ball-type superalloy.With the thickness of brazing gap constant and increasing the ratio of the third-generation single crystal superalloy powder in the mixed filler,the precipitation of M_(3)B_(2) type boride and low-melting point phases in the joint can be inhibited,and the distribution of borides becomes more uniform and the size becomes smaller,thus improving the uniformity of the composition and microstructure of the joint.When the proportion of alloy powder increased from 0%to 50%,the endurance life of the joint increased from 15 min to 34 hours.However,when the proportion of alloy powder increased to 60%,there are a lot of void defects in the joint,resulting in the endurance life of the joint decreased to 4 hours.

关 键 词：混合粉末钎料 大间隙钎焊 单晶高温合金 微观组织 

分 类 号：TG454[金属学及工艺—焊接]