Brazing of casted K465 nickel-based superalloy and the related applications for repair

LI Sisi; JING Yongjuan; CHENG Yaoyong; PEI Chong; MAO Wei

doi:10.7512/j.issn.1001-2303.2020.11.07

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Brazing of casted K465 nickel-based superalloy and the related applications for repair
Vol. 50, Issue 11, Pages: 37-42(2020)
DOI： 10.7512/j.issn.1001-2303.2020.11.07

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LI Sisi, JING Yongjuan, CHENG Yaoyong, et al. Brazing of casted K465 nickel-based superalloy and the related applications for repair. [J]. 50(11):37-42(2020)
DOI：

LI Sisi, JING Yongjuan, CHENG Yaoyong, et al. Brazing of casted K465 nickel-based superalloy and the related applications for repair. [J]. 50(11):37-42(2020) DOI： 10.7512/j.issn.1001-2303.2020.11.07.

摘要

介绍了目前4种K465镍基铸造高温合金钎焊技术及其在修复中的应用。对于常规钎焊间隙,采用Co45NiCrWB、BNi82CrSiB、BNi57NbCoWCrAlSiMo和BNi73CrSiB-40Ni钎料皆适合钎焊K465高温合金,其中Co45NiCrWB钎料的钎焊接头性能最好;采用真空电弧钎焊方法和B-Ni65CoCrWBMoAlNb钎料,可实现K465合金与耐磨合金B-2合金的连接,钎焊缝连续、致密、无裂纹等未焊合缺陷,叶片组织未见晶粒长大现象;采用FGH95镍基合金粉为预填高熔点粉末的方法可实现0.5 mm大间隙的K465合金钎焊;真空电子束钎焊作为一种高质量、高效率、精确控制的制造技术,对各种精密、复杂部件连接制造具有非常重要的意义。

Abstract

In this study,the brazing of casted K465 nickelbased superalloy with four different brazing methods and related brazing repair applications were introduced. For normal gap brazing,Co45NiCrWB,BNi82CrSiB,BNi57NbCoWCrAlSiMo and BNi73CrSiB-40Ni filler alloys were all suitable for the brazing of K465 superalloy,and the joint brazed with Co45NiCrWB filler alloy exhibited highest joint strength. The joining of K465 superalloy and B-2 wear-resistant alloy could be realized by vacuum arc brazing with B-Ni65CoCrWBMoAlNb filler alloy. Sound joints without cracks and coarse grains were obtained. Furthermore,the joining of K465 superalloy with the large brazing gap of 0.5 mm was studied by adding the mixed powders of FGH95 nickel-base alloy and brazing filler alloy. Additionally,due to its high quality, high efficiency and precise control characteristics,vacuum electron beam brazing technology could be widely applied in the joining of components with complex structures.