关键词: 镍基合金GH4700, 固溶处理, γ’相, 晶粒尺寸, 力学性能

Abstract: The effect of solid solution treatment at 1 000 ~ 1 150 Y on structure and mechanical properties of alloy GH4700 (/% : 0. 05C, 25Cr, 20Co, 1. 65Nb, 1. 47A1, 1. 69Ti, bal Ni) has been studied. Results show that the tensile, yield strength and elongation of 4>89 mm x 15 mm GH4700 alloy tube extruded at 1 180 °C , air cooling are respectively 1 150 MPa, 780 MPa, and 36% ; as the alloy solid-solution-treaded at 1 000 ~ 1 060 ℃ with increasing temperature the γ’ phase gradually dissolves into the matrix, the grains of alloy grow obviously, the strength decreases markedly and the plasticity rapidly increases; at 1 090 ~ 1 150 °C the trend of grain growth is not appreciable, the change trend of strength and plasticity of alloy is very slow； with solid-solution-treated at 1 150 ℃，the tensile strength, yield strength and elongation of alloy GH4700 are respectively 800 MPa, 330 MPa and 65%.

Key words: GH4700 Nickel Base Alloy, Solid-Solution Treatment, ,  γ’ Phase, Grain Size, Mechanical Properties