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首页> 外文期刊>Physica, B. Condensed Matter >Beyond Ni-base superalloys: Influence of Cr addition on Co-Re base alloys strengthened by nano-sized TaC precipitates
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Beyond Ni-base superalloys: Influence of Cr addition on Co-Re base alloys strengthened by nano-sized TaC precipitates

机译：除了Ni-Base高温合金之外：Cr加入Cr加入通过纳米TAC沉淀加强的共重基础合金的影响

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摘要

The high-temperature Co-Re alloy [1], a promising candidate for gas turbine applications, has a complex microstructure containing various kinds of precipitates in different size scales. The nano-sized fine spherical TaC ( 100 nm) precipitates are the most important for strengthening of the alloy. In this contribution the influence of Cr addition (5 at.% and 15 at.%) on the strengthening TaC precipitates in Co-Re-Ta-C alloy with a C/Ta ratio of 0.9 is studied. The Cr content is important for the oxidation resistance of the alloy, but it also influences the size and volume fraction of TaC precipitates and consequently the possible formation of the Cr-rich Cr2Re3 (sigma phase) and Cr23C6 precipitates. In addition, Cr influences the temperature of the allotropic phase transformation of the Co matrix phase. It was found that additions of 5 at.% or 15 at.% Cr in the alloy does not result in the formation of Cr2Re3 and Cr23C6 phases. Further, the addition of such smaller amounts of Cr does not retain the Co gamma (fcc) phase (stable or metastable) at room temperature after cooling from high temperatures. Only the e (hcp) phase is present at low temperatures. The TaC precipitates are slightly influenced in size and volume fraction with 5 at.% and 15 at.% Cr.
机译：高温Co-Re合金[1]是一种燃气轮机应用的有希望的候选者，具有含有不同大小尺度的各种沉淀物的复杂微观结构。纳米尺寸的细球形TAC（＆ 100nm）沉淀物是强化合金最重要的。在这种贡献中，研究了Cr添加（5at。％和15.％）对C / Ta比的加强TAC沉淀物对C / TA比的加强TAC沉淀物的影响。 Cr含量对于合金的抗氧化性是重要的，但它也影响TAC沉淀物的尺寸和体积分数，从而影响CR富含Cr的Cr2Re3（Sigma相）和Cr23C6沉淀物的可能形成。此外，CR影响CO基质相的同种异性相变温度。结果发现，添加量为5at。％或15。％Cr在合金中不会导致Cr2Re3和Cr23C6相的形成。此外，在从高温冷却后，添加如此较少量的CR不会在室温下保留COγ（FCC）相（稳定或稳定的）。在低温下仅存在E（HCP）阶段。 TAC沉淀物的尺寸和体积分数略微影响，5at％和15.％Cr。

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