GH4169合金与FGH96合金惯性摩擦焊接头组织和力学性能

Microstructure and properties of GH4169 nickel-based superalloy and FGH96 nickel-based powder metallurgy superalloy inertial friction welding joint

关键词:  惯性摩擦焊  GH4169合金  FGH96合金  航空发动机  热端部件

Key words:  inertial friction welding  GH4169  FGH96  aircraft engine  aero-engine hot component

摘要:

在主轴转速为650 r/min、转动惯量为340 kg·m²、焊接压力为450 MPa焊接参数下，实现GH4169与FGH96异质材料惯性摩擦焊接，并对焊后热处理的接头进行显微组织与力学性能分析.在焊接热-力耦合作用下，焊接接头不同区域的金相组织发生变化，晶粒出现不同程度的细化、变形，基体强化相出现不同程度的溶解、变形.焊接接头显微硬度呈"山峰"状分布特征，焊接接头室温抗拉强度平均值为1 366 MPa，高温抗拉强度平均值为1 176.7 MPa，在650℃，641 MPa条件下的平均持久寿命为215 h，焊接接头具有良好的综合力学性能.

Abstract:

Under the welding parameters that spindle speed was 650 r/min, moment of inertia was 340 kg·m² and welding pressure was 450 MPa, GH4169 and FGH96 was welded by inertial friction welding. Under the action of welding pressure and welding heat cycle, the microstructure of different parts of the welded joint changed, the grains appeared to be refined and deformed to different extents, and the matrix strengthening phase dissolved and deformed to different degrees of dissolution and deformation. Affected by the heat-force coupling effect of the welding, the microhardness of the welded joint was characterized by a "mountain peak" distribution. Mechanical properties of welded joints were tested and analyzed:the average tensile strength of welded joints was 1 366 MPa, and the average tensile strength of high temperature was 1 176.7 MPa. The average long-lasting life was 215 hours at 650℃ and 641 MPa. The welded joint had good comprehensive mechanical properties.