国家重点基础研究发展计划资助项目(2010CB631201)。
ZHAO Yunsong
Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials, Beijing 100095, P. R. China;State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, P. R. China采用光学显微镜和扫描电镜对铸态、固溶态和时效态的第二代镍基单晶合金DD11的显微组织进行定量表征,并测试了不同一级时效处理后的合金1100℃/140 MPa和980℃/250 MPa条件下的持久性能。结果表明:合金经过1320℃/6 h固溶处理后,(γ+γ')共晶相全部溶解,凝固偏析显著降低,合金组织均匀。一级时效温度低于1160℃时,γ'相为方形,一级时效温度高于1180℃时,γ'相为球形,γ通道显著变宽,并在通道内析出细小的γ'相。随一级时效温度提高,合金的持久寿命先增大后降低。持久性能与γ'相尺寸、体积分数及形态密切相关。
The quantitative investigation of as-cast, as solution and ageing heat-treated microstructures of a second generation Ni-based single crystal DD11 was carried out through OM and SEM. The stress rupture properties of the alloys which had been first ageing treated under 1 100℃/140 MPa and 980℃/250 MPa respectively were also tested. The results indicate that (γ+γ') eutectic is almost dissolved when DD11 is under solution treatment of 1 320℃/6 h. And the degree of solidification segregation significantly decreases, and the alloy exhibits uniform microstructure. When the first ageing treatment temperature is lower than 1 160℃, the shape of γ' phase is cubic. But the shape transforms to sphericity when the aging temperature is higher than 1 180℃, the width of γ phase channel greatly increases, and fine γ' phase precipitates in the γ phase channel. With the increase of the first ageing treatment temperature, the stress rupture live of the alloy increases first and then decreases. The stress rupture properties are closely related to the size, the volume fraction and the morphology of γ' phase.
骆宇时,赵云松,刘志远,郭会明,方向,张剑,唐定中.热处理对第二代镍基单晶合金DD11显微组织及持久性能的影响[J].重庆大学学报,2016,39(3):43-50.
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