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Creep properties and design curves for nitrogen enhanced grade of 316LN stainless steel

机译：316LN氮增强钢的蠕变性能和设计曲线

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摘要

316L(N) stainless steel (SS) containing 0.02-0.03 wt-% carbon and 0.06-0.08 wt-% nitrogen is the principal material for the high temperature structural components of the prototype fast breeder reactor in India. In order to increase the economic competitiveness of sodium cooled fast reactors (SFRs), there is a strong desire to increase the design life from the current level of 40 years to at least 60 years for the future reactors. As a part of the efforts to develop materials with superior mechanical properties suitable for longer design life, the influence of nitrogen at concentrations higher than 0.07 wt-%, on the high temperature mechanical properties of type 316L(N) SS is being studied. Four heats of 316L(N) SS, containing 0.07, 0.11, 0.14 and 0.22 wt-% nitrogen have been evaluated extensively in terms of their tensile, creep, low cycle fatigue and creep fatigue interaction properties. Based on these studies, the nitrogen content has been optimised at 0.14 wt-%. This nitrogen enhanced grade of steel (NE316LN SS) was found to have significantly better tensile, creep, low cycle fatigue and creep-fatigue properties as compared to the PFBR grade of 316L(N) SS. This paper presents the influence of nitrogen on the creep deformation, damage and fracture behaviour of NE316LN SS. Design of high temperature SFR components is made on the basis of RCC-MR design code. The creep properties of NE316LN SS have been analysed in terms of the procedures for generation of the design code. Time-dependent design curves have been generated.
机译：在印度，原型L型快速增殖反应堆的高温结构组件的主要材料是316L（N）含0.02-0.03 wt％的碳和0.06-0.08 wt％的氮的不锈钢（SS）。为了提高钠冷快堆的经济竞争力，强烈希望将未来反应堆的设计寿命从目前的40年提高到至少60年。作为开发适用于更长设计寿命的具有优异机械性能的材料的努力的一部分，正在研究浓度高于0.07 wt％的氮对316L（N）SS型高温机械性能的影响。含0.07、0.11、0.14和0.22 wt％氮的316L（N）SS的四炉热已通过拉伸，蠕变，低周疲劳和蠕变疲劳相互作用特性得到了广泛评估。根据这些研究，氮含量已优化为0.14 wt％。与316L（N）SS的PFBR级相比，发现这种氮增强级的钢（NE316LN SS）具有明显更好的拉伸，蠕变，低周疲劳和蠕变疲劳性能。本文介绍了氮对NE316LN SS蠕变变形，损伤和断裂行为的影响。高温SFR组件的设计是根据RCC-MR设计规范进行的。 NE316LN SS的蠕变特性已根据生成设计规范的程序进行了分析。随时间变化的设计曲线已生成。

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