Abstract
Mechanical properties of nuclear reactor pressure vessel materials need to be assessed for degradation while operating under an irradiated condition, but conventional destructive tensile testing is not possible in such cases. In the present paper, a methodology is suggested which relates microstructural parameters to macro-mechanical properties of 20MnMoNi55 steel. Morphological variation of 20MnMoNi55 steel has been achieved through inter-critical heat treatment based on the phase fraction of constituent phases. The inter-critical temperature range of as-received material is determined through dilatometric testing. A color etching technique has been adopted for identification of different phases present in as-received and heat treated steel specimens. Vickers hardness values of each constituent phase as obtained from micro-hardness testing is correlated and standardized with the specified color code of each phase through image analysis of colored optical micrographs. Finally macro-hardness, obtained from the standard mixture rule based on micro-hardness and volume fraction of constituent phases, is correlated with tensile properties.
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