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首页> 外文期刊>Scripta materialia >PRECIPITATION STRENGTHENING AND AGE-HARDENING IN FERRITIC Fe-Cr-Al-Ru ALLOYS
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PRECIPITATION STRENGTHENING AND AGE-HARDENING IN FERRITIC Fe-Cr-Al-Ru ALLOYS

机译：铁素体Fe-Cr-Al-Ru合金的析出强化和时效处理

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摘要

The isothermal age-hardening behaviour of ferritic Fe-20Cr-5Al and Fe-35Cr-5Al alloys with Ru additions of up to 4 wt percent was studied to establish whether a B2 RuAl-type (ordered b.c.c.) precipitate structure could be developed in the temperature range 723-1123 K. Significant strengthening was observed in alloys containing 2-4 wt percent Ru at 723K, although the ageing behaviour was more typical of '475 deg C embrittlement'. Age-hardening was observed for alloys containing 4 wt percent Ru at 923 K, associated with the development of a fine, semi-coherent plate precipitate structure, observed using TEM. However, the precipitates were found by EDS to be consistent with a Tower aluminide. No hardening was observed at 1023 K. In further experiments: (1) Decreasing the Al:Ru ratio by lowering the Al content did not effect age-hardening apart from the apparent '475 deg C embrittlement'. (2) Static oxidation tests at 1473 K showed divergent behaviour in the alloys; the rate of mass loss increased with Ru content in Fe-20Cr-5Al, but 4 wt percent Al minimised the mass loss in Fe-35Cr-5Al.
机译：研究了Ru添加量最高为4 wt％的铁素体Fe-20Cr-5Al和Fe-35Cr-5Al合金的等温时效行为，以确定是否可以在合金中形成B2 RuAl型（有序bcc）沉淀结构。温度范围为723-1123K。在723K含2-4％（重量）Ru的合金中观察到显着强化，尽管时效行为在“ 475℃脆化”中更为典型。使用TEM观察到，在923 K时，含4 wt％Ru的合金会出现时效硬化，这与精细，半连贯的板状沉淀结构的发展有关。但是，EDS发现沉淀与塔铝化物一致。在1023 K时未观察到硬化。在进一步的实验中：（1）通过降低Al含量来降低Al：Ru的比例，除了出现明显的“ 475℃脆化”之外，没有进行时效硬化。 （2）在1473 K的静态氧化试验中，合金表现出不同的行为。 Fe-20Cr-5Al中的质量损失率随Ru含量的增加而增加，但是4％的Al可使Fe-35Cr-5Al的质量损失最小。

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