固溶及时效热处理对冷拉态GH600合金组织和力学性能的影响

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Abstract： The effects of three diferent heat treatment processes （solution treatment，aging treatment， solution + aging treatment）on the microstructure and mechanical properties of cold-drawn GH6oO alloy were investigated by OM， SEM， microhardnesstest， double shear test and microcomputercontrolled electronic universal testing machine. The results show that thecold-drawn GH6oO aloy has the bestcomprehensive properties after aging treatment. After being held at 718°C for16h （air cooling），the hardness，tensile strength and shear strength of the alloy reach 173HV， （204号 727.3MPa and 563MPa .This is due to the fact that after aging treatment，a large number of dispersed γ′ phase and carbides are precipitated from the matrix ofcold-drawn GH6oO alloy.These precipitated phases are nailed to the grain boundaries，which hinders the grain growth and thus improves the mechanical properties ofcold-drawn GH600 alloy.

Keywords： GH6Oo alloy; cold-pull state; heat treatment; mechanical property

1 序言

高温合金由于其在高温下可以保持良好的力学性能和抗蠕变性能，因此被广泛应用于航空发动机涡轮叶片、工业燃气轮机和燃烧室等部位的连接结构中[1-4]。（剩余8213字）