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Vania Rodríguez, H.
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article
Effect of heat treatment processes on the microstructure and mechanical properties of spray-formed 440C martensitic stainless steel
Abstract
In the present work, 440C martensitic stainless steel (440C MSS) was manufactured by spray forming (SF) technology. Microstructural and mechanical properties such as strength, ductility, and toughness were evaluated after quenching and tempering-partitioning (Q-TP) and quenching-intercritical quenching-tempering (Q-IQ-T) heat treatments. The microstructural features that control the deformation and fracture behavior are discussed for the different heat treatment conditions. The experimental results showed that after austenitizing at 1050 °C the material exhibits no apparent plastic deformation before fracture. However, specimens austenitized above 1050 °C and the specimen subjected to Q-IQ-T exhibit an improvement in the tensile properties by showing an elastic-plastic transition. This improvement of ductility and strength is related to the strain-induced martensitic transformation of retained austenite formed during the Q-TP process and to a decrease in the volume fraction of martensite with increasing the austenitizing temperature. Also, it was observed that the strain-hardening rate decreases with increasing austenitizing temperature. Furthermore, the stress-strain data suggests that the Q-IQ-T heat treatment effectively improves the toughness and ductility of the steel without compromising strength. The results indicate, that the mechanical response of the SF-440C MSS can be tailored by adjusting the heat treatment parameters which will enable better design for industrial applications. This article is protected by copyright. All rights reserved.