A thermomagnetic study of the martensite-austenite phase transition in the maraging 350 steel

Abstract

A thermomagnetic analysis of the maraging 350 steel quenched from 1000°C and cold rolled with completely martensitic structure is presented. In fast heating and cooling rate (10°Cmin−1) tests the start (As) and final (Af) temperatures of the martensite (M) to austenite (γ) transformation were determined as 690 and 800°C, respectively. The martensite start (Ms) and final (Mf) temperatures were 175°C and 130°C, respectively. In low heating rate tests, the austenite formation may happen above 510°C, which is associated with precipitation reactions. Both γ→M and M→γ may progress isothermally. The kinetics of these reactions at selected temperatures were also investigated by thermomagnetic analysis.