本文研究了沉淀强化型Fe—Ni—Co基低膨胀Incoloy 907合金在不同热处理条件下的组织结构变化及其力学性能的影响。结果表明,弥散分布的γ’相为合金中的主要强化相,当γ’相呈细小均匀弥散分布时,合金具有良好的综合力学性能;合金在较高温度时效或过时效时,析出针状ε相,此时合金性能恶化。
Effect of microstructure on the mechanical properties of a precipitation strengthening Fe--Ni--Co based low expansion alloy, Incoloy 907, has been investigated under different heat treatments. the dispersed γ phase is found to be the principal strengthening phase in the alloy. The microstructure of the alloy with even dispersed fine γ' phase seems to have the best match of its mechanical properties. However, it will be worsened if the alloy aged at some higher temperature or overaged to precipitate needle--like ε phase.
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