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首页> 外文期刊>ISIJ international >Effects of Cobalt Addition on the Precipitation Evolution and Tensile/creep Behavior of Fe-15Cr-25Ni-2.5Al-NbWCu Alumina-forming Austenitic Steel at 700°C
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Effects of Cobalt Addition on the Precipitation Evolution and Tensile/creep Behavior of Fe-15Cr-25Ni-2.5Al-NbWCu Alumina-forming Austenitic Steel at 700°C

机译：钴添加对700°C时Fe-15cr-25Ni-2.5Al-NBWCu铝铝铝铝沉淀速度和拉伸/蠕变行为的影响

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摘要

The effects of Co on the precipitation evolution and tensile/creep properties of the alumina-forming austenitic (AFA) stainless steel at 700°C were systematically investigated. Two investigated steels based on the Fe-15Cr-25Ni-2.5Al (in mass%) AFA steel were prepared; one is added 2.5 mass% W sorely, and the other is added 2.5 mass% W and 5 mass% Co together. After aging treatment, secondary NbC was precipitated in both steels and dispersed within the matrix. However, after adding Co to AFA steels, nanoscale L1_(2) Ni–Al–Cu phase was not observed, and the amount of Laves and the δ -ferrite phase decreased with the same aging time, indicating that addition of Co improved microstructure stability. The tensile strength of AFA specimens with added Co did not significantly decrease, especially with a long-term aging treatment, compared to samples without added Co. However, introducing Co greatly improved the toughness of AFA steels. Also, the results of the creep fracture tests show that adding Co improved the creep life of AFA steels. The reason for this enhancement is that the formation of detrimental secondary phases at the grain boundary was greatly suppressed, after adding Co to AFA steels.
机译：有系统研究了CO对700℃下氧化铝形成奥氏体（AFA）不锈钢的沉淀蒸馏和拉伸/蠕变性能的影响。制备了基于Fe-15cr-25ni-2.5Al（质量％）AFA钢的两种研究钢;加入2.5质量％W加入2.5质量％，另一种是加入2.5质量％的W和5质量％的CO。在老化处理后，次级NBC在两个钢中沉淀并分散在基质内。然而，在向AFA钢添加到AFA钢之后，未观察到纳米级L1_（2）Ni-Al-Cu相，并且熔炉的量和δ- - 异丙菌素相随着相同的老化时间而降低，表明加入CO改善的微观结构稳定性。然而，与没有添加的样品的样品相比，AFA标本的拉伸强度没有显着降低，特别是在长期老化处理中，引入CO大大提高了AFA钢的韧性。此外，蠕变骨折试验的结果表明，添加CO改善了AFA钢的蠕变寿命。这种增强的原因是在向AFA钢加入到AFA钢后，大大抑制了晶界的有害二次相的形成。

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