Open AccessEffect of prior annealing on the microstructure and mechanical properties of thermo-mechanically treated TRIP steel
Author(s) -
Ludmila Kučerová,
Karolína Burdová,
Adam Stehlík,
Iveta Tichá
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1161/1/012002
Subject(s) - microstructure , materials science , annealing (glass) , ultimate tensile strength , plasticity , scanning electron microscope , metallurgy , continuous cooling transformation , trip steel , composite material , bainite , martensite
Low-carbon low-alloyed high strength steel 0.2C-1.5Al-0.5Si-2Mn-0.06Nb (in weight %) was forged into bars and annealed at 1050 °C with either 2-hour hold and furnace cooling to room temperature or with 20-min hold and controlled cooling by 1 °C/s. These various holds and coolings created two different initial microstructures, banded ferritic-pearlitic one for the long hold and bainitic-ferritic for the shorter hold and quicker cooling. Samples with those microstructures then underwent the same thermo-mechanical treatment (TMT) typical for TRIP (transformation induced plasticity) steels. Very different microstructures and mechanical properties were obtained for both initial states even after the application of the same TMT schedules. Light and scanning electron microscopy was used to characterize obtained microstructures and tensile tests were applied for the determination of mechanical properties.