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首页> 外文期刊>Metallurgical and Materials Transactions A >Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates
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Improved Creep Behavior of a High Nitrogen Nb-Stabilized 15Cr-15Ni Austenitic Stainless Steel Strengthened by Multiple Nanoprecipitates

机译：多种纳米沉淀物强化的高氮固氮15Cr-15Ni奥氏体不锈钢的蠕变行为的改善

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摘要

Austenitic stainless steels are expected to be a major material for boiler tubes and steam turbines in future ultra-supercritical (USC) fossil power plants. It is of great interest to maximize the creep strength of the materials without increasing the cost. Precipitation strengthening was found to be the best and cheapest way for increasing the creep strength of such steels. This study is concerned with improving creep properties of a high nitrogen Nb-stabilized 15Cr-15Ni austenitic alloy through introducing a high number of nanosized particles into the austenitic matrix. The addition of around 4 wt pct Mn and 0.236 wt pct N into the 15Cr-15Ni-0.46Si-0.7Nb-1.25Mo-3Cu-Al-B-C matrix in combination with a special multicycled aging-quenching heat treatment resulted in the fine dispersion of abundant quantities of thermally stable (Nb,Cr,Fe)(C,N) precipitates with sizes of 10 to 20 nm. Apart from the carbonitrides, it was found that a high number of coherent copper precipitates with size 40 to 60 nm exist in the microstructure. Results of creep tests at 973 K and 1023 K (700 °C and 750 °C) showed that the creep properties of the investigated steel are superior compared to that of the commercial NF709 alloy. The improved creep properties are attributed to the improved morphology and thermal stability of the carbonitrides as well as to the presence of the coherent copper precipitates inside the austenitic matrix.
机译：在未来的超超临界（USC）化石电厂中，奥氏体不锈钢有望成为锅炉管和蒸汽轮机的主要材料。在不增加成本的情况下最大化材料的蠕变强度是非常令人感兴趣的。发现沉淀强化是增加这种钢的蠕变强度的最佳和最便宜的方法。这项研究与通过向奥氏体基体中引入大量纳米尺寸颗粒来改善高氮Nb稳定化的15Cr-15Ni奥氏体合金的蠕变性能有关。向15Cr-15Ni-0.46Si-0.7Nb-1.25Mo-3Cu-Al-BC基体中添加约4 wt％的Mn和0.236 wt％的N并结合特殊的多循环时效淬火热处理可得到良好的分散性大量热稳定的（Nb，Cr，Fe）（C，N）沉淀物尺寸为10至20 nm。除碳氮化物外，还发现在微观结构中存在大量尺寸为40至60 nm的连贯铜沉淀。在973 K和1023 K（700°C和750°C）下的蠕变测试结果表明，与商用NF709合金相比，所研究的钢的蠕变性能优异。改善的蠕变性能归因于碳氮化物的形态和热稳定性的改善，以及奥氏体基体内部相干铜沉淀的存在。

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