论文部分内容阅读
本文系统地研究了钽在镍基铸造高温合金K9中的作用。钽不仅能提高合金的高温瞬时强度和持久、蠕变性能,而且还明显地改善高温瞬时和持久的塑性。相分析结果表明:合金中～80％的钽进入γ’相,～15％形成富钽的MC碳化物,其余进入γ固溶体。钽不仅增强了γ’相的强化效果,而且还复合以良好的固溶强化。同时还增加了合金的长期稳定性,钽还提高抗冷热疲劳及抗海洋性燃气腐蚀性能。
This paper systematically studied the role of tantalum in the production of nickel-base superalloy K9. Tantalum not only improves the high temperature instantaneous strength and long-term creep properties of the alloy but also significantly improves high temperature transient and long-lasting ductility. Phase analysis results show that ~ 80% of tantalum in the alloy enters the γ ’phase, ~ 15% forms the tantalum-rich MC carbide and the rest enters the γ solid solution. Tantalum not only enhances the strengthening effect of γ ’phase, but also compound with good solid solution strengthening. At the same time also increased the long-term stability of the alloy, tantalum also improve anti-thermal fatigue and anti-marine gas corrosion.