The effect of stress triaxiality on the phase transformation in transformation induced plasticity steels: Experimental investigation and modelling the transformation kinetics

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:800

Article

Polatidis, E.¹  Haidemenopoulos, G. N.²  Krizan, D.³  Aravas, N.^2,4  Panzner, T.^1,5  Smid, M.⁶  Papadioti, I.²  Casati, N.⁶  Petegem, S. Van⁶  Swygenhoven, H. Van^6,7 

[1] Paul Scherrer Inst, Lab Neutron Scattering & Imaging, CH-5232 Villigen, Switzerland

[2] Univ Thessaly, Dept Mech Engn, Volos 38334, Greece

[3] Coil Voestalpine Stahl GmbH, Business Unit, Res & Dev Dept, A-4020 Linz, Austria

[4] Kyushu Univ, Int Inst Carbon Neutral Energy Res WPI I2CNER, Nishi Ku, 744 Moto Oka, Fukuoka 8190395, Japan

[5] Swissneutronics AG, CH-5313 Klingnau, Switzerland

[6] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[7] Ecole Polytech Fed Lausanne, Neutrons & Xrays Mech Mat, IMX, CH-1015 Lausanne, Switzerland

关键词: TRIP;    Steel;    Martensite;    Kinetics;    Model;   

DOI  :  10.1016/j.msea.2020.140321

来源: Elsevier

【 摘 要 】

In situ multiaxial loading during neutron diffraction tests were undertaken on a low-alloyed Quenched and Partitioning (Q&P) Transformation Induced Plasticity (TRIP) Bainitic Ferrite (TBF) steel with dispersed austenite particles. The effect of stress triaxiality on the evolution of the deformation-induced martensite is investigated under uniaxialand equibiaxial-tension as well as tension/compression with a ratio of-1:6. It is shown that transformation is not a monotonic function of stress triaxiality; the amount of deformation-induced martensite is similar under uniaxial and equibiaxial tension but it is significantly smaller under tension/compression. The transformation kinetics are modeled using a recently developed kinetic model that accounts for the stress state and the stability and size of the austenite particles. The larger austenite particles transform first and the mean volume of the austenite particles decreases with increasing strain; the decreasing austenite particle size impedes the phase transformation as the deformation proceeds. It is concluded that stress triaxiality alone cannot account for the differences in the transformation kinetics between different loading states and that the number of potential nucleation sites depends on the stress state.

【 授权许可】

Free