Effect of hot deformation on microstructure, hardness and precipitation kinetics in a C350 maraging steel modified by titanium addition

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Abstract

Maraging steels are alloys with a good balance between strength and fracture toughness. These properties are obtained by quenching and aging treatments, where the precipitation of intermetallic compounds is promoted in a martensitic matrix. In this context, this paper aims to evaluate the effect of hot deformation on microstructure, kinetics and formation of reverted austenite in a C350 maraging steel modified by titanium addition, in order to improve the mechanical properties without addition of alloying elements. The following characterization techniques were used: optical microscopy (OM), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD), Vickers microhardness and Dilatometry. The results showed that the deformation promoted a refinement of martensitic packages and blocks, proportional to the reduction of height and a preferred alignment towards the center of the sample. In the aging treatment, the deformation accelerated the kinetics of precipitation and formation of reverted austenite. It was also verified a reduction of the volumetric variation produced by reactions and a reduction of precipitation temperature and formation of reverted austenite in the greater deformation.

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de Oliveira Freitas, G. H., & de Oliveira, C. A. S. (2018). Effect of hot deformation on microstructure, hardness and precipitation kinetics in a C350 maraging steel modified by titanium addition. Materials Research, 21(6). https://doi.org/10.1590/1980-5373-MR-2018-0120

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