Ni_3Al基合金IC6与变形合金GH3030间真空钎焊接头的组织与力学性能

Microstructure and mechanical properties of vacuum brazing joint between Ni_3Al-based alloy IC6 and wrought superalloys GH3030

将两种Ni基钎料ВПР24和GHL-6-2用于IC6合金与变形高温合金GH3030之间的真空钎焊,分析接头钎缝和近缝区母材的微观组织,测试接头的900℃高温持久寿命,并对断口纵剖面微观组织进行分析。结果表明:ВПР24对近缝区母材组织没有明显的影响;GHL-6-2中降熔元素B含量较高,导致钎缝两侧近缝区母材析出大量针状硼化物相,严重影响了接头组织及性能,其900℃、22 MPa持久寿命仅73 h;而使用ВПР24的接头的900℃、22 MPa持久寿命为361 h,并最终断于母材GH3030,可见,使用ВПР24的接头钎缝处的持久性能比GH3030基体合金的更好。

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.