Time–temperature-sensitization diagrams and critical cooling rates of different nitrogen containing austenitic stainless steels

Nitrogen-alloyed 316L stainless steel is being used as structural material for high temperature fast breeder reactor components with a design life of 40 years. With a view to increase the design life to 60 years and beyond, high nitrogen stainless steels are being considered for certain critical com...

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Bibliographic Details
Published in:Journal of nuclear materials 2010-04, Vol.399 (1), p.62-67
Main Authors: Parvathavarthini, N., Dayal, R.K.
Format: Article
Language:English
Subjects:
Applied sciences
Austenitic stainless steel
Austenitic stainless steels
Controled nuclear fusion plants
Cooling rate
Critical cooling rates
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Fuels
Heat resistant steels
Heat treatment
Installations for energy generation and conversion: thermal and electrical energy
Nuclear engineering
Nuclear fuels
Nuclear power generation
Nuclear reactor components
Nuclear reactors
Sensitization
Stainless steels
TTS diagrams
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Summary:Nitrogen-alloyed 316L stainless steel is being used as structural material for high temperature fast breeder reactor components with a design life of 40 years. With a view to increase the design life to 60 years 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 823–1023 K for various durations ranging from 1 h to 500 h. 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.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2010.01.003