真空釬焊接頭的組織與力學(xué)性能
(1. 北京航空航天大學(xué) 材料科學(xué)與工程學(xué)院，北京 100191；
2. 北京航空材料研究院，北京 100095)
摘 要: 將兩種Ni基釬料ВПР24和GHL-6-2用于IC6合金與變形高溫合金GH3030之間的真空釬焊，分析接頭釬縫和近縫區(qū)母材的微觀(guān)組織，測(cè)試接頭的900 ℃高溫持久壽命，并對(duì)斷口縱剖面微觀(guān)組織進(jìn)行分析。結(jié)果表明：ВПР24對(duì)近縫區(qū)母材組織沒(méi)有明顯的影響；GHL-6-2中降熔元素B含量較高，導(dǎo)致釬縫兩側(cè)近縫區(qū)母材析出大量針狀硼化物相，嚴(yán)重影響了接頭組織及性能，其900 ℃、22 MPa持久壽命僅73 h；而使用ВПР24的接頭的900 ℃、22 MPa持久壽命為361 h，并最終斷于母材GH3030，可見(jiàn)，使用ВПР24的接頭釬縫處的持久性能比GH3030基體合金的更好。
關(guān)鍵字: IC6合金；GH3030；真空釬焊；接頭；組織；持久壽命
（1. School of Materials Science and Engineering, Beihang University, Beijing 100191, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China）
Abstract:Two Ni-based filler metals ВПР24 and GHL-6-2 used to produce Ni-based superalloys blades and vanes were used on vacuum barzing between alloy IC6 and wrought superalloys GH3030. The microstructures of bonding seam and base metal nearby were observed, and endurance life at 900 ℃ was tested. The results show that ВПР24 has no significant effect on the microstructure of the base metal near the bonding seam. Due to a high borocic content in GHL-6-2, much acerose borides bring a bad effect on the properties of the joint precipitate in the base metal next to the bonding seam. The 900 ℃, 22 MPa stress rupture life of joint using GHL-6-2 is 73 h while that of the joint using ВПР24 is 361 h. The joint using ВПР24 finally breaks in the base metal GH3030. This indicates that the endurance of the joint is better than that of the base metal GH3030.
Key words: alloy IC6; GH3030; vacuum brazing; joints; microstructure; endurance life
