Time–temperature-sensitization diagrams and critical cooling rates of different nitrogen containing austenitic stainless steels
Time–temperature-sensitization diagrams and critical cooling rates of different nitrogen containing austenitic stainless steels
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DOI：
10.1016/j.jnucmat.2010.01.003
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发表时间：
2010-04
影响因子：
3.1
通讯作者：
N. Parvathavarthini;R. Dayal
中科院分区：
文献类型：
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作者：
N. Parvathavarthini;R. Dayal
高温快堆部件结构材料采用含氮316L不锈钢，设计寿命为40年。为了将设计寿命提高到60年或更长时间，正在考虑将高氮不锈钢用于某些可能在高温下使用的关键部件。由于碳和氮对敏化动力学有重要影响，本文研究了含(I)0.07%N和0.035%C、(II)0.120%N和0.030%C、(III)0.150%N和0.025%C以及(IV)0.22%N和0.035%C四个炉次的316L不锈钢的敏化行为。这些不锈钢在823-1023K的温度范围内进行了1h至500h的热处理。利用ASTM标准的A262标准A和E试验，构建了时间-温度-敏化图，并根据这些图计算了不存在敏化风险的临界冷却速度。所建立的数据可用于快速堆预制件热处理时最佳热处理参数的选择。
Nitrogen-alloyed 316L stainless steel is being used as structural material for high temperature fast breeder reactor components with a design life of 40years. With a view to increase the design life to 60years and beyond, high nitrogen stainless steels are being considered for certain critical components which may be used at high temperatures. Since carbon and nitrogen have major influence on the sensitization kinetics, investigations were carried out to establish the sensitization behaviour of four heats of 316L SS containing (i) 0.07%N and 0.035%C, (ii) 0.120%N and 0.030%C, (iii) 0.150%N and 0.025%C and (iv) 0.22%N and 0.035%C. These stainless steels were subjected to heat treatments in the temperature range of 823–1023K for various durations ranging from 1h to 500h. Using ASTM standard A262 Practice A and E tests, time–temperature-sensitization diagrams were constructed and from these diagrams, critical cooling rate above which there is no risk of sensitization was calculated. The data established in this work can be used to select optimum heat treatment parameters during heat treatments of fabricated components for fast reactors.