Low temperature deformation behaviour of ASTM A-203D nuclear structural steel

Sinha, T. K. ; Chakravartty, J. K. ; Wadekar, S. L. ; Asundi, M. K. (1984) Low temperature deformation behaviour of ASTM A-203D nuclear structural steel Journal of Materials Science, 19 (5). pp. 1446-1455. ISSN 0022-2461

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Related URL: http://dx.doi.org/10.1007/BF00563039


The steel A-203D in martensitic, tempered martensitic and ferritic-pearlitic microstructural conditions, was deformed in tension at temperatures between 77 to 300 K and at a strain rate of 6.67×10-5 sec-1. The thermal component of the flow stress and the activation parameters were measured as a function of temperature. It was observed that the microstructure did not affect either the thermal part of the flow stress (σ*) or the activation parameters (V* and ΔH) and that its effect was felt only on the athermal component (σμ) of the flow stress. Further the relations of the activation parameters with stress, strain and temperature were found to be consistent with Dorn-Rajnak theory of Peierls mechanism of plastic deformation. In addition measurements of slow-bend and impact transition were also carried out for ferritic-pearlitic structure. Based on these observations, it is shown that the impact transition temperature of this structure can be emperically correlated with the thermal activation parameters.

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