CAJ | 학술논문

采用钴基钎料及镍基合金粉料，分别在1170℃保温10min、60min 和120min 的钎焊工艺下，对 K452镍基铸造高温合金进行真空钎焊实验，通过扫描电镜和能谱分析仪进行了接头显微组织观察与物相分析，并测试钎焊接头的高温力学性能。结果表明：在保温60min 的工艺规范下，界面实现较好的结合，钎缝内部孔洞缺陷较少，钎缝组织均匀，有利于钎焊接头性能的提高；在更长的保温时间120min 下，钎缝内部又有蚀孔缺陷形成，且较多的白色块状化合物在合金粉颗粒间聚集长大，但界面结合良好，钎焊接头性能较高，900℃抗拉强度达到400MPa，900℃／100MPa 持久寿命为141 h55min。
채용고기천료급얼기합금분료，분별재1170℃보온10min、60min 화120min 적천한공예하，대 K452얼기주조고온합금진행진공천한실험，통과소묘전경화능보분석의진행료접두현미조직관찰여물상분석，병측시천한접두적고온역학성능。결과표명：재보온60min 적공예규범하，계면실현교호적결합，천봉내부공동결함교소，천봉조직균균，유리우천한접두성능적제고；재경장적보온시간120min 하，천봉내부우유식공결함형성，차교다적백색괴상화합물재합금분과립간취집장대，단계면결합량호，천한접두성능교고，900℃항랍강도체도400MPa，900℃／100MPa 지구수명위141 h55min。
Vacuum brazing of K452 superalloy was performed with cobalt-base filler metal and nickel-base superalloy powder under bra-zing conditions of 1 170℃ /10min,1 170℃ /60min and 1 170℃ /120min respectively.The microstructure of brazed joints was analyzed by using SEM and EDS,and the high-temperature mechanical properties were also studied.The results show that the sound joints with fine microstructure and rare pores are achieved under 1 170℃ /60min brazing procedure,due to the good quality of interface.The joints braze under 1 170℃ /120min show the highest mechanical properties because of better interface quality,the average 900℃ tensile strength of 400MPa and 900℃ /100MPa stress-rupture life of 141 h /55min.But there morepoles are presented,and many white parti-cles of compound congregated and grow up between the nickel-base superalloy powder in the brazing seam.