在多晶铸造高温合金中加入铼并观察其铸态组织, 发现在(γ+γ') 共晶附近有μ相和类树枝晶 γ' 相析出, 测定合金中各种相的形成顺序和共晶反应偏析, 分析了初生μ相和类树枝晶γ'相的形成机理, 研究了Re在多晶铸造高温合金凝固过程中的作用和对合金凝固组织的影响.
The solidification behavior and as-cast microstructure feature of a nickel-base Recontaining superalloy for conventional casting have been investigated. The results show that because of the adding of Re, the (γ+γ') eutectic temperature, MC carbide formation temperature and γ' precipitating temperature are increased, and the eutectic reaction segregation as well as solidification segregation is enhanced. There is a eutectic reaction segregation region around eutectic caused by eutectic forming. The pseudo-dendritic γ' precipitates form, resulting from latent heat of eutectic reaction and impact of Re in γ' precipitating temperature together.
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