Abstract
The intercritical annealing and isothermal bainitic processing response was studied for three Nb and V microalloyed Transformation-Induced Plasticity (TRIP)-assisted 980 MPa grade steels. Their mechanical and microstructural properties were compared to industrially produced TRIP 800 steel. Depending on the isothermal holding temperature and microalloying, the experimental steels reached properties comparable to the reference steel. The retained austenite content did not show direct correlation to elongation properties. Niobium was found to be more effective microalloying element than vanadium in increasing the elongation properties, which were investigated by measuring true fracture strain from tensile test specimens.
Highlights
Aluminium and silicon alloyed, low-carbon Transformation-Induced Plasticity (TRIP) steels have interested researchers for many decades [1,2,3,4,5,6]
A was studied in dilatometry tests in an earlier study by Nyyssönen et al [37], but the JMatPro®
The intercritical annealing response of four TRIP-assisted Si + Al alloyed steels was investigated in this study
Summary
Low-carbon Transformation-Induced Plasticity (TRIP) steels have interested researchers for many decades [1,2,3,4,5,6]. During the straining and eventual plastic deformation of the steel, the retained austenite induces the TRIP effect: transformation of austenite into martensite which significantly increases both strength and ductility of steel due to the strain hardening [8]. Current TRIP-assisted steels typically contain 5–15% retained austenite and other phases and microstructural constituents in varying amounts [14]
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