Abstract: Microstructure evolution and mechanical properties of a hot-rolled Fe-6Mn-3Al TRIP steel were studied by using the heat treatment process of quenching and annealing for different time (ART). The results showed with the increase of annealing time， the grain size of austenite increases and the stability decreases. Part of the austenite transforms into martensite in the cooling process. After annealing for 10min， the performance of the experimental steel is optimal. The volume fraction of austenite is 50.3%， the ultimate tensile strength is 765MPa and the total elongation is 49.1%. The content of the austenite decreases and the martensite increases after deformation. The TRIP effect is most obvious after annealing for 10 min. The volume fraction of austenite reduces from 50.3% to 11% after deformation. The transformation rate of austenite is 78%.

Key words: hot-rolled, TRIP steel, retained austenite, reverse transformation, transformation rate of austenite