International Conference on TRIP-Aided High Strength Ferrous Alloys Editor: Prof. Bruno C. De Cooman GRIPS' Sparkling World of Steel Vol. 1: Proceedings Table of contents Table of contents De Cooman, Bruno C: 11 Preface Bleck, Wolfgang: 13 Using the TRIP effect - the dawn of a promising group of cold formable steels Low and high alloy TRIP steels. Phase transformations. Austenite stability. Strainharden- ing. Temperature sensitivity. Strength-ductility relationship. Energy absorption. Micro- structure optimization. Fundamental Materials Science of the TRIP Phenomenon Kruijver, Suzelotte; Zhao, Lie; Sietsma, Jilt; Offerman, Erik; van Dijk, Niels; Margulies, 25 Lawrence; Lauridsen, Erik; Grigull, Stephan; Poulsen, Henning; van derZwaag, Sybrand: In situ observations on the austenite stability in TRIP-steel during tensile testing TRIP steel. Synchrotron radiation. Austenite stability. Deformation. Diffraction. Carbon concentration. Austenite fraction. Crystal orientation. lung, Thierry; Drillet, Jos&e; Couturier, Audrey; Olier, Christopher: 31 Detailed study of the transformation mechanisms in ferrous TRIP aided steels TRIP. Bainite transformation. Cementite composition. Austenite stability. Size effect Furnemont, Quentin; Jacques, Pascal J.; Pardoen, Thomas; Lani, Frederic; Godet, 39 Stephane; Harlet, Philippe; Conlon, Kelly and Delannay, Francis. The macro- and micromechanics of TRIP-assisted multiphase steels, experiments and modelling TRIP-assisted multiphase steels. Multiphase microstructure. Nanohardness. Neutrons dif- fraction. Mechanical properties. Multi-scale approach. Modelling. Sugimoto, Koh-ichi; Kikuchi, Ryo; Hashimoto, Shun-ichi: 45 Development of high strength low alloy TRIP-aided steels with annealed martensite matrix Microstructure. Retained austenite. TRIP. Annealed martensite. Ductility. Formability. High strength steel Allain, Sebastien; Chateau, Jean-Philippe; Bouaziz, Olivier: 51 Constitutive model of the TWIP effect in a polycrystalline high manganese content austenitic steel Steel. TWIP. Manganese. Modelling. Nucleation law. Twinning. Mean free path. Vercammen, Steven; De Cooman, Bruno C; Akdut, Nuri; Blanpain, Bart; Wollants, Patrick: 55 Microstructural evolution and crystallographic texture formation of cold rolled aus- tenitic Fe-30Mn-3AI-3Si TWIP-steel Fe-Mn-AI-Si. Austenite. SFE. Cold rolling. Brass texture. Shear band. Wirthl, Edwin; Pichler, Andreas; Angerer, Reinhold; Stiaszny, Peter; Hauzenberger, Karl; 61 Titovets, Yuri F.; Hackl, Michael: Determination of the volume amount of retained austenite and ferrite in small specimens by magnetic measurements TRIP-steel. Retained austenite. X-Ray diffraction. Barb6, Liesbeth; De Meyer, Marijke; De Cooman, Bruno C: 65 Determination of the Mg temperature of dispersed phase TRIP-aided steels TRIP-aided steels. Mf temperature. Retained austenite. High strength steels. Martensitic transformation. Int. Conf. on TRIP-Aided High Strength Ferrous Alloys Table of contents Zhao, Lie; Tegus, Ojiyed; Bruck, Ekkes; van Dijk, Niels H.; Kruijver, Suzelotte; Sietsma, 71 Jilt; van derZwaag, Sybrand: Magnetic determination of the thermal stability of retained austenite in TRIP steel Retained austenite. Thermal stability. Martensite transformation. Thermo-magnetisation measurements. Thermodynamics. TRIP steel. Allain, Sebastien; Chateau, Jean-Philippe; Bouaziz, Olivier; Legros, Marc; Garat, Xavier: 75 Characterization of the mechanical twinning microstructure in a high manganese content austenitic steel Steel. TWIP. Microtwins. Mean free path. Twinning kinetic. Acoustic emission. Pychmintsev, Igor Y; Savrai, Roman A.; De Cooman, Bruno C: 79 Effect of stress state on the transformation behaviour and mechanical properties of TRIP-aided automotive steels CMnSi. CMnAISi. Cold rolled TRIP steel. Plasticity. High hydrostatic pressure. Transfor- mation behaviour. Microstructure. Ros-Yanez, Tanya; Houbaert, Yvan; Petrov, Roumen; Mertens, Anne: 85 Characterisation of TRIP-assisted steel by atomic force microscopy and OIM TRIP-assisted steel. Atomic force microscopy. AFM. EBSD. OIM. Magnetic force micros- copy. MFM. Multiphase steel. Metallography. Phase identification. Brux, Udo; Frommeyer, Georg; GrSssel, Oliver; Meyer, Lothar Werner; Weise, Andrea: 91 Development and characterization of high strength impact resistant Fe-Mn-(AI, Si) TRIP/TWIP steels Development of Fe-Mn-AI-Si alloys. Exploitation of TRIP effect and TWIP effect, y-e-a' phase transformation. Martensitic transformation. Twinning. Enhancement of formability by varied deformation parameters. Temperature. Strain rate. Scott, Colin; Drillet, Josee: 97 Quantitative analysis of local carbon concentrations in TRIP steels Carbon concentration. Residual austenite. TEM. CBED. PEELS. Methodology. TRIP-Aided Ferrous Alloys Takahashi, Manabu; Yoshida, Hiroshi; Hiwatashi, Shinji: 103 Properties of TRIP typehigh strength steels TRIP. Crashworthiness. Retained austenite. Martensite transformation. Stretchability. Deep drawability. Bainite transformation. Matsuda, Hiroshi; Kitano, Fusato; Hasegawa, Kohei; Urabe, Toshiaki; Hosoya,Yoshihiro: 113 Metallurgy of continuously annealed high strength TRIP steel sheet TRIP steel. Annealing conditions. Cooling conditions. Austempering conditions. Mechanical properties. Microstructure. Bainite. Retained austenite. Martensite. Carbon content. Traint, Sandra; Pichler Andreas; Hauzenberger, Karl; Stiaszny Peter; Werner, Ewald: 121 Influence of silicon, aluminium, phosphorus and copper on the phase transforma- tions of low alloyed TRIP-steels Austenite transformation behaviour. Heat treatment. Retained austenite. Jacques, Pascal J.; Harlet, Philippe; Delannay, Francis: 129 Critical assessment of the phase transformations occurring during the heat- treatment of TRIP-assisted multiphase steels TRIP-assisted multiphase steels. Hot-rolling. Mechanical properties. Multiphase micro- structures. Int. Conf. on TRIP-Aided High Strength Ferrous Alloys Table of contents Godet, Stephane; Harlet, Philippe; Delannay, Francis andJacques, Pascal J.: 135 Effect of hot-rolling conditions on the tensile properties of multiphase steels exhib- iting a TRIP effect TRIP-assisted multiphase steels. Hot-rolling. Mechanical properties. Multiphase micro- structures. Zhao, Lie; Moreno, Juan; Kruijver, Suzelotte; Sietsma, Jilt; van derZwaag, Sybrand: 141 Influence of intercritical annealing temperature on phase transformations in a high aluminium TRIP steel Intercritical annealing. Thermodynamics. Dilatometry. X-ray diffraction. TRIP steel. Barbe, Liesbeth; Tosal-Martfnez, Luc fa; De Cooman, Bruno C: 147 Effect of phosphorus on the properties of a cold rolled and intercritically annealed TRIP-aided steels High strength steels. Intercritical annealing. Retained austenite. Phosphorus. Timokhina, liana B.; Hodgson, Peter D.; Pereloma, Elena V.: 153 Effect of alloying elements on the microstructure-property relationship in ther- momechanically processed C-Mn-Si TRIP steels Thermomechanical processing. Alloying elements. Granular bainite. Acicular ferrite. Re- tained austenite. Martensite. Morphology. Stability. Mechanical properties. Strain harden- ing coefficient. Mahieu, Jan; Van Dooren, Danny; Barbe, Liesbeth; De Cooman, Bruno C: 159 Influence of Al, Si and P on the kinetics of intercritical annealing of TRIP-aided steels: thermodynamical prediction and experimental verification Transformation kinetics. Intercritical annealing. Silicon. Aluminum. Phosphorus. Kim, Sung-Joon; Lee, Chang Gil; Jeong, Woo-Chang; Park, Ikmin: 165 Microstructures and mechanical properties of the 0.15% C TRIP-aided cold-rolled steels containing Cu, Ni and Cr TRIP. Multiphase steels. Tramp elements. Retained austenite. Tensile properties. Pichler, Andreas; Traint, Sandra; Blaimschein, Martin; Sperl, Johann; Stiaszny, Peter; 171 Werner, EwaldA: Correlation between thermal treatment, retained austenite stability and mechanical properties of low-alloyed TRIP steels TRIP steel grades. Pearlite. Bainite. Martensite. Retained austenite. Overaging. Cooling rate. Transformation. Mechanical properties. Timokhina, liana B.; Hodgson, Peter D.; Pereloma, Elena V.: 181 Effect of strain and morphology of the bainitic microstructure on the retained aus- tenite stability and mechanical properties of thermomechanically processed C-Mn- Si(-Nb) TRIP steels Thermomechanical processing. Granular bainite. Acicular ferrite. Retained austenite. Martensite. Morphology. Stability. Mechanical properties. Strain hardening coefficient. Huang, Jin; Hammond, Robert P.; Conlon, Kelly; Poole, Warren J.: 187 An experimental study of the ferrite-austenite two phase region in a Fe-C-Mn-Si steel using neutron diffraction Multi-phase steel. Intercritical annealing. Neutron diffraction. Van Hecke, Patrick; Penning, Jan: 193 TRIP-effects in austempered ductile irons Steel. TRIP-effect. Ductile iron. Austempering. Strength properties Int. Conf. on TRIP-Aided High Strength Ferrous Alloys Table of contents Ohlert, Joachim; Bleck, Wolfgang; Hulka, Klaus: 199 Control of microstructure in TRIP steels by niobium Phase transformations. Niobium. Volume ratio of bainite and ferrite. Carbon enrichment. Martensite nucleation. Process control. Mechanical properties. Shi, Wen; Li, Lin; Zhou, Yuan; Fu, Ren Yu; Wei, Xi Cheng; De Cooman, Bruno C; Wol- 207 lants, Patrick; Zhu, Xiao Dong; Wang, Li: Effect of Mn content on the microstructures and mechanical properties of cold rolled O.15C-0.6Si-Mn TRIP steels TRIP steel. Microstructures. Mechanical properties. Zhou, Yuan; Shi, Wen; Wei, Xi Cheng; Li, Lin;