Damage development in low alloy TRIP-aided steels during air-bending |
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Authors: | D Rèche T SturelO Bouaziz A ColAF Gourgues-Lorenzon |
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Affiliation: | a MINES ParisTech, Centre des Matériaux, CNRS UMR 7633, BP 87, 91003 Evry Cedex, France b ArcelorMittal Global R&D, Voie Romaine, BP 30320, 57283 Maizières-lès-Metz Cedex, France |
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Abstract: | In order to optimize the metallurgical quality of advanced high strength steels for automotive applications, the present study aims at understanding damage mechanisms involved in air-bending of two low alloy TRansformation Induced Plasticity (TRIP)-aided steels. Air-bending tests were performed together with metallographic investigations of damage development in bent specimens. In order to assess the role of hard bands induced by chemical segregations, air-bending tests on specimens with various locations of the main hard band (with respect to the neutral fibre) were performed. Cracking initiates from the outer surface or from just below, mainly by decohesion between ferrite and secondary (martensite) phases, at hard bands located close to the outer surface. From these examinations, together with a simple kinematics analysis of bending, a quantitative relationship between cracking, local thickness of hard band and local “mesoscopic” strain is proposed. |
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Keywords: | Ultra high strength steels Air-bending Microstructure Fracture mechanisms |
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