The mechanical properties after tempering and intercritical annealing of medium manganese steels with 4 wt% Mn for forging applications are presented. After subsequent air cooling, heat treatments were performed, specifically from 250 450 °C between 600 675 °C. Tensile properties, Charpy V-notch impact toughness, hardness determined compared microstructural features characterized by metallograp...

Abstract The steels with excellent strength and ductility are expected to be achieved by tailoring the microstructural features. In this work, laminate dual-phase (DP) high martensite content (laminate HMDP steels) were produced a combination of warm rolling intercritical annealing. Influence strain annealing temperature on evolution mechanical properties systematically studied. was significant...

Recent studies on TRIP-assisted multiphase steels have emphasised the drastic importance of the bainitic transformation in the optimisation of properties. Bainitic ageing is necessary for the stabilisation of austenite with respect to the martensitic transformation. This metastable retained austenite can still transform to martensite when plastically deformed (TRIP effect). The present work dea...

In this study, we used 0.2C-1.7Si-1.9Mn wt% cold-rolled sheet as the experimental material to prepare Q&P sample with blocky microstructures and QQ&P lath-shaped through processes, respectively. The partitioning behavior of carbon manganese in two samples after intercritical annealing were studied. During annealing, occurred, resulting contents being significantly higher than those ferr...

Medium-Mn automotive sheet steels require optimized heat-treatment processes to obtain benefits caused by strain-induced martensitic transformation of retained austenite (RA) during metal forming or crash events. The intercritical annealing (IA) approach at different temperatures in a range 640 °C 800 is proposed the study for 5Mn hot-rolled medium-Mn steel. experiments were performed terms dil...

The standard heat treatment of PH 13-8 Mo maraging steels consists solution annealing and subsequent aging. Herein, it is investigated how an additional intercritical step prior to aging affects the microstructure, and, consequently, mechanical properties a steel. In situ techniques by means high-temperature electron backscatter diffraction X-ray are applied study microstructural changes during...