Investigation of Deformation Mechanisms in Deep-Drawn and Tensile-Strained Austenitic Mn-Based Twinning Induced Plasticity (TWIP) Steel

Abstract

The effect of strain on the deformation mechanisms in an austenitic Mn-based twinning induced plasticity (TWIP) steel is investigated using magnetic measurements, XRD, positron beam Doppler spectroscopy, and finite element method simulations. The experimental observations reveal the formation of a 0 -martensite at specific degrees of deformation, despite the high stacking fault energy (SFE) of the material (52 mJ/m 2 ). The observed fraction a 0 -martensite is consistent with the estimated fraction of intersected shear bands acting as preferred nucleation sites for a 0 -martensite formation as a function of accumulated equivalent strain.

Microstructural evolution and deformation behavior of twinning-induced plasticity (TWIP) steel during wire drawing

“…Nevertheless, there have been, to our knowledge, very few studies [8,10,11] on application of TWIP steels for wire products while there are numerous studies on TWIP steels for sheet products [7,[12][13][14][15][16][17][18][19][20][21]. One of the issues related to wire drawing of TWIP steel is whether its high formability can be translated as high drawability.…”

Diffusion Analyses Using GDOES Technique of the 22MnB5 Press Hardened Steel with Al-Si and Zn-Ni Coatings

“…It is a strategic product to help the automakers satisfying safety needs and fuel reduction requirements by means of the lightweight design concept, a current trend for new vehicles [1]. Press hardened steels (PHS) are boron-manganese steels classified as ultra high strength steel [2]. They are usually used in hot stamping process achieving at the end of the process tensile strength of up to 1500 MPa [3,4].…”

“…The hot stamping consists in heating a blank at total austenitization temperatures, around 900 °C by 10 minutes, and transfer the blank into the press tooling for forming and fast cooling to fully martensitic transformation. At the beginning of the process the steel has around 600 MPa of tensile strength due to the microstructure, which comprises ferrite and perlite; at the end it increases up to 1500 MPa as consequence of martensitic transformation [2][3][4][5][6].…”