Advanced Materials for Emerging Applications (Innovations, Improvements, Inclusion and Impact)

Nitrogen Additions to Type 316L Stainless Steel to Enhance its High Temperature Performance for Structural Applications in Fast Reactors

Author(s): M. Vasudevan*, V. Karthik, A. Nagesha and G. V. Prasad Reddy

Pp: 80-111 (32)

DOI: 10.2174/9789815196771124010007

* (Excluding Mailing and Handling)


The high-temperature performance of the nitrogen added 316L stainless steels including the high-temperature mechanical properties, workability and weldability have been investigated in detail by systematic studies with nitrogen contents in the range of 0.07-0.22wt.%. Strength and creep resistance were found to increase with increasing nitrogen content at room and elevated temperatures. However, resistance to creep-fatigue damage, fracture toughness, resistance to fatigue crack growth, workability, and weldability were found to degrade beyond 0.14wt% of nitrogen content at service temperature. Therefore, the maximum nitrogen content in 316L stainless steel is recommended to be 0.14wt% for better high-temperature performance in structural applications of fast reactors.

Keywords: Creep, Creep-fatigue interaction, Dynamic materials model, Fracture toughness, Fatigue crack growth, Fractographs, Hot cracking, Nitrogen alloying, Tensile properties, Workability, Weldability, 316LN Stainless Steel.

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