Toward Unraveling the Importance of Deformed Microstructure before TRIP Heat Treatment in Transformation-Induced Plasticity Steels

Abstract

The importance of deformed microstructure before transformation‐induced plasticity (TRIP) heat treatment in transformation‐induced plasticity steels was taken into account. The heavily cold‐rolled sheet was annealed at 650 °C for enough time to replace the deformed microstructure with a recrystallized one. It was revealed that the tensile strength, ductility, strain‐hardening capability, and TRIP effect are significantly impaired by the annealing of cold‐rolled sheets. This was explained based on the distribution of the retained austenite phase, strength of ferritic matrix, and the deformation‐induced martensitic transformation.

Refinement of Banded Structure via Thermal Cycling and Its Effects on Mechanical Properties of Dual Phase Steel

“…The present work aims to systematically study the microstructural refinement of DP steel during thermal cycling. The initial full annealed sheets having distinct banded structure were considered in this work, which makes it easier to study the refinement of microstructure by consideration of band spacing.…”

Tailoring the Mechanical Properties of Copper‐Added Transformation‐Induced Plasticity‐Aided Multiphase Steel by Thermomechanical Processing

“…This reveals that by tailoring the thermomechanical processing history and addition of copper, it is possible to improve the strength‐ductility synergy of the TRIP steels, which is an important requirement for the application of these steels. The addition of Cu brings another advantage, which is the precipitation strengthening during aging at subcritical temperatures [ 13 ] that can be used for further strengthening.…”

“…[4][5][6] While the response of Si-TRIP steels, Al-Si TRIP steels, metastable austenitic stainless steels, and high-Mn TRIP/TWIP steels have intensively been studied so far, [5][6][7][8][9][10][11][12] the Cu-bearing TRIP steels have received less attention. [13][14][15][16][17][18][19] Copper is added to steel to enhance its corrosion resistance [20] and to increase its strength through precipitation hardening in concentrations greater than 0.75%. [21][22][23][24][25][26][27] Copper is also an austenite stabilizer and has a beneficial effect on the formation of retained austenite resulting in the improvement of strength-ductility synergy.…”