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Abstract

The aim of the present investigation was to determine the influence after quenching, of tempering within the temperature range A_s–A_f (i.e. α′ →+γ transformation range) on the fracture toughness of an austenitic–martensitic high nickel steel with additions of molybdenum, niobium, and titanium. It has been found that for the heat treatment cycle applied, the most advantageous values of fracture toughness J_Ic are obtained after tempering at ∼975 K. The increase in the J_Ic value observed after tempering above 950K results from a decrease in the proportion of martensite, due to transformation to mechanically unstable austenite, which when subjected to deformation at room temperature, transforms into martensite.

MST/1933

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Microstructure and fracture toughness of N26MT2Nb steel after selected heat treatments

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