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本文对比地研究了两种低铬-高钨系列的铸造镍基高温合金的铸态显微组织,在850～1100℃范围内热暴露1000～3000小时后的相析出规律,显微组织和微量相的变化及铝化物涂层的蜕化。 试验结果表明这些合金具有高的组织稳定性,标准成份的合金在所有热暴露条件下不析出TCP相,经1050℃/1000小时后K002和K19H合金中微量相总量只分别增加了89％和18％。 提出了下列反应:由于上述反应夺取γ中残余的碳,抑制了M_6C和M_(23)C_6的形成。 此外,在K19H的MC碳化物中含有大量Nb使MC稳定,因此减缓了下列反应;
In this paper, we compared the as-cast microstructure of two kinds of low chromium-high tungsten cast nickel-base superalloy. The phase precipitation regularity after 1000 ~ 3000h exposure at 850 ~ 1100 ℃, the microstructure and the micro-phase The change and the aluminide coating degeneration. The experimental results show that these alloys have high tissue stability, the standard composition of the alloy does not precipitate under all thermal exposure TCP phase, after 1050 ℃ / 1000 hours K002 and K19H alloy trace amount only increased by 89% and 18%. The following reactions have been proposed: Since the above reaction captures the residual carbon in γ, the formation of M_6C and M_ (23) C_6 is inhibited. In addition, the presence of a large amount of Nb in the MC carbide of K19H stabilizes the MC, thereby slowing down the following reactions;