EFFECT OF IRON ON THE MICROSTRUCTURE, PROPERTIES AND PRECIPITATE KINETIC OF SIGMS PHASE IN A CAST NICKEL-BASE SUPERALLOY
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摘要: 本文采用不同的熱處理制度,著重研究了鐵（0～25%）對Ni—Cr—Mo—A—Ti型鎳基合金σ相析出動力學以及對合金性能的影響。研究結果表明:在鎳基鑄造合金中,σ相的形成與鐵含量有密切關系,鐵可以明顯改變合金元素在γ—γ'中的分配關系,并提高合金的平均電子空位數,從而促進σ相析出;隨著鐵含量的增加,合金的持久強度降低,但對拉伸性能影響較小。Abstract: The effect of iron（0-25%）on the sigma phase preciptate kinetic and properties of a Ni-Cr-Mo-Al-Ti alloy by different heat treatment has been investigated. It was shown that sigma phase formation is related to iron content. Iron as alloying element could change the partitioning ratios of alloying elememts between γ-γ’ phases and increase average electron vacancy number Nv, and thus promote sigma phase to precipitate. Stress rupture strength of alloy is decreased in increase of iron content, but its effect on tensile properties is little.
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