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K417G高溫合金大間隙釬焊的組織演變與性能的研究
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1.華南理工大學(xué) 國家金屬材料近凈成形工程技術(shù)研究中心;2.東莞市精研粉體科技有限公司

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廣東省產(chǎn)學(xué)研重大專項(2014B010129002)；廣東省自然科學(xué)基金重點項目(2018B030311051)；東莞市引進創(chuàng)新科研團隊計劃(201536000200027)


Microstructural evolution and mechanical properties of wide gap brazing of K417G superalloy.
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1.National Engineering Research Center of Near-net-shape Forming for Metallic Materials,South China University of Technology;2.Dongguan Hyper Tech Co Ltd

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    摘要:

    采用低熔點的含硼鎳基合金粉末與高熔點鎳基合金粉末的混合粉末作為釬料，在真空熱壓爐中對K417G鎳基高溫合金進行大間隙釬焊連接。研究了釬料成分對接頭顯微組織演變規(guī)律的影響，分析了接頭的強化機制。結(jié)果表明，提高釬料中高熔點合金粉的含量，可有效減少焊縫中硼化物的形成量，提高焊縫組織均勻性。當(dāng)釬料中高熔點合金粉含量為95 wt.%時，硼元素擴散均勻，獲得彌散分布的顆粒狀的M3B2 型硼化物，接頭的室溫和600 °C抗拉強度為971 MPa和934 MPa，達(dá)到了母材的強度。此外，原位析出于接頭界面處的細(xì)小彌散碳硼化物M23(C,B)6與基體的共格關(guān)系是實現(xiàn)高質(zhì)量大間隙釬焊連接的重要因素。

    Abstract:

    In recent years, with the development of industrial production, the repair and bonding of wide gaps has always been a key technology. In this study, a gap (width of 20 mm) was bonded by wide gap brazing technology. The K417G superalloy was used as the base metal, and a mixture of low-melting powder (LMP) and high-melting powder (HMP) was used as the filler metal. In this research, K417G superalloy was brazed by different contents of LMP + HMP mixed powder. The microstructure evolution and mechanical properties of joint was analyzed. With increasing the ratio of HMP in the filler metal, the borides in the joint was decreased and the uniformity of composition and microstructure of joint was improved. When the ratio of HMP in the filler metal increased to 95 wt.%, B can be uniformly diffused into the HMP and brittle borides at the interface were significantly reduced. The tensile strength of the joint at room temperature and 600 °C was 971 MPa and 934 MPa, reaching the strength of base metal. In addition, the fine particles of M23(C, B)6 carbon-boride are coherently precipitated in-situ in the joint and uniformly dispersed, facilitating excellent repair.

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程準(zhǔn),李小強,屈盛官,朱德智,李暉云. K417G高溫合金大間隙釬焊的組織演變與性能的研究[J].稀有金屬材料與工程,2021,50(9):3262~3269.[Cheng Zhun, Li Xiaoqiang, Qu Shengguan, Zhu Dezhi, Li huiyun. Microstructural evolution and mechanical properties of wide gap brazing of K417G superalloy.[J]. Rare Metal Materials and Engineering,2021,50(9):3262~3269.]
DOI：10.12442/j. issn.1002-185X.20200762

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  • 收稿日期:2020-09-29
  • 最后修改日期:2020-11-23
  • 錄用日期:2020-12-14
  • 在線發(fā)布日期: 2021-09-27
  • 出版日期: 2021-09-24