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Effect of phosphorus on the stress rupture properties of IN706 superalloy

机译：磷对IN706超合金应力破裂性能的影响

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摘要

The effect of phosphorus (P) and the form it exists on the stress rupture properties of IN706 superalloy has been investigated by testing alloys with four different P contents and heat treated under two schemes. The results showed that a maximum stress rupture life was obtained when 0.008 wt% P was added for the alloy subjected to the phosphide precipitation promotion heat treatment; whilst the stress rupture life of the alloy was continuously increased when the P content was ranged from 0.002 wt% to 0.017 wt% for the alloy subjected to the phosphide precipitation suppression heat treatment. The beneficial effect of P when the phosphide precipitation was suppressed was attributed to its segregation at the grain boundaries, leading to grain boundary strengthening and improvement in inter granular oxidation resistance. However, this beneficial effect was weakened when needle-shaped s phase precipitated at the grain boundaries combined with the decreased P grain boundary segregation. Additionally, no obvious effect of P on the stress rupture ductility of IN706 alloy was identified.
机译：通过测试具有四种不同P含量的合金并在两种方案下进行热处理，研究了磷（P）和其存在于In706超合金的应力破裂性能的影响。结果表明，当向磷化物沉淀促进热处理的合金加入0.008wt％P时，获得最大应力破裂寿命;当P含量为0.002wt％至0.017wt％时，合金的应力破裂寿命不断增加，而对于对磷化物沉淀抑制抑制热处理的合金。抑制磷化物沉淀时P的有益作用归因于其在晶界处的偏析，导致粒度抗氧化抗性的晶界强化和改善。然而，当在晶界在晶界沉淀的针状S相与降低的p晶界偏析结合时，这种有益效果被削弱。另外，鉴定了P对IM706合金的应力破裂延性的明显效果。

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