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长期时效期间K452和K446合金中的γ′相形貌都保持球形,尺寸不断粗化,但K446中γ′相的粗化速率总体上比K452快.初生MC的热稳定性不仅与MC本身的化学成分密切相关,而且与合金成分有关;合金中γ基体的热稳定性(即晶内二次碳化物或TCP相的析出)与初生MC的热稳定性有关;晶界粗化通过γ′沉淀及镶嵌于其中的碳化物(M_(23)C_6或M_6C)的析出和长大来实现.γ′相粗化、初生MC分解、晶界粗化以及二次碳化物或TCP相的析出等,使合金的力学性能明显下降。
The γ ’phase morphology of K452 and K446 alloy kept spherical shape and the size was continuously coarsening during the long-term aging, but the coarsening rate of γ’ phase in K446 was generally faster than that of K452.The thermal stability of primary MC was not only related to MC itself The chemical composition is closely related to the composition of the alloy. The thermal stability of the γ matrix in the alloy (that is, the precipitation of secondary carbides or TCP phases in the alloy) is related to the thermal stability of the primary MC. And the carbide (M_ (23) C_6 or M_6C) embedded in it, and the growth and growth of the γ ’phase coarsening, primary MC decomposition, grain boundary coarsening and precipitation of secondary carbides or TCP phase, The mechanical properties of the alloy decreased significantly.