Metallurgical and mechanical analysis from thixoforging steel shape

Becker, Eric; Bigot, Régis; Langlois, Laurent; Favier, Véronique; Pierret, Jean-Christophe; Cezard, Pierre

doi:10.1007/s12289-008-0221-y

Cited by 8 publications

(5 citation statements)

References 4 publications

(6 reference statements)

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“…The C38 steel slug, of 30mm diameter and 45mm height, is heated uniformly at a temperature of 1420 °C with an inductive furnace [5-6.10]. The filing tool at room temperature (30 ° C) moves at a constant speed of 50 mm/s during the entire forming with a specific device mounted on a high speed hydraulic press [5][6]10,11] (extrusion test "50CL85").…”

Section: Thixoextrusion Experimentsmentioning

confidence: 99%

“…Instrumented extrusion experiments used to determine the key parameters influencing the thixoforging [5,6] (the speed of the tool, the temperature of the billet and the tool temperature) helped to highlight the great influence of heat exchange between tool and workpiece on the result even if the forming time is extremely short (less than 0.5 s). Compared to other models for metal alloys at semi-solid state [7], a multi-scale "micro-macro" model considering the two-phase nature of the semi-solid and taking into account the microstructures evolution, the behavior of both phases and has been developed and implemented in Forge® to simulate the steel thixoforging at semi-solid state [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Thermomechanical Modelling and Simulation of C38 Thixoextrusion Steel

Becker

Langlois

Favier

et al. 2014

SSP

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The present paper focuses the modelling and the simulation of a direct thixoextrusion test achieved on C38 semi-solid steel. Many parameters related to thermal, mechanical, material features are involved but are currently unknown. Consequently to validate the modelling and the simulation, it is important to get various experimental informations during the test and to correlate them with simulated results. In a previous paper (Becker et al, 2008), the force-displacement curve, the temperature within the die, the macro and micro structure obtained for different process parameters during thixoextrusion of C38 were investigated. In this work, those results are correlated to those obtained by simulations of the processing. The simulations were performed using the commercial software Forge®. The thermal modelling is based on the heat equation and the thermal boundary conditions involving the heat losses, the thermal conduction within the semi-solid slug and the die and the plastic dissipation as heat source. The latent heat associated to the liquid-solid phase transformation is not considered here. The constitutive equation of the material is given by a multi-scale modelling based on micromechanics and homogenization techniques, labelled as micro-macro modelling (Favier et al, 2009). Friction is modelled using the usual modified Tresca equation. The parameters of the model are determined (i) using literature results and (ii) to match various experimental measurements obtained during the test and described in Becker et al (2008) such as the die temperature during the test and the load-displacement curve. Comparisons between experimental and simulated reveal the presence of complex temperature field and the presence of zones having very low viscosities. These zones contribute actively to the semi-solid material flow.

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Section: Thixoextrusion Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermomechanical Modelling and Simulation of C38 Thixoextrusion Steel

Becker

Langlois

Favier

et al. 2014

SSP

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“…The load is mainly driven by the liquid content and the forming parameters which were the same for all the grades. But it also depends on the thermal exchanges with the tool [8,9] which are higher if the material is hotter because the tool is kept to a constant temperature. This explains why the load was a bit higher for the C38 steel that must be heated up to a higher temperature.…”

Section: Figure 6: Inclusions and Pores Observed In The Partsmentioning

confidence: 99%

Influence of the chemical composition on the Thixoformability of steels

et al. 2009

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This work deals with the qualification of a variety of steels for their shaping by the thixoforging process. This technology requires setting up a globular microstructure inside the material during reheating to a temperature between the solidus and liquidus. As the evolution of the liquid fraction is strongly connected to the steel composition, it is useful to understand how low carbon steel could be alloyed and still thixoformable. The most critical parameter for this is the carbon content. In this study, a theoretical analysis of the phase evolution during the reheating has been performed on the MT Data software to investigate the influence of alloying elements. These first results have been confirmed by Differential Thermal Analysis and by inductive heating experiments on steel slugs. Finally, some parts have been shaped using a thixoforming tool mounted on a hydraulic press. Micrographs of reheated slugs as well as of actual parts are also presented in this paper.

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“…Since 1998 the subject has gained a great enthusiasm, the study of steel thixoforming has then become an important topic within the SSM research areas. Several research teams, mainly in Europe and Asia, have been involved in the development of this process (Kapranos, Kirkwood and Atkinson in the UK [8][9][10][11][12][13][14][15], Kopp, Hirt, Püttgen, and Modigell in Germany [16][17][18][19][20][21][22][23][24][25], Bigot, Favier in France [26][27][28][29][30], Rassili in Belgium [31][32][33][34][35], Omar in Malysia [36], Li in China [37]).…”

Section: Introductionmentioning

confidence: 99%

A Review on Thixoforming of High Melting Point Alloys

Rassili

2016

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This template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. Please make the page settings of your word processor to A4 format (21 x 29,7 cm or 8 x 11 inches); with the margins: bottom 1.5 cm (0.59 in) and top 2.5 cm (0.98 in), right/left margins must be 2 cm (0.78 in). We shall be able to publish your paper in electronic form on our web page http://www.scientific.net, if the paper format and the margins are correct. Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.

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Metallurgical and mechanical analysis from thixoforging steel shape

Cited by 8 publications

References 4 publications

Thermomechanical Modelling and Simulation of C38 Thixoextrusion Steel

Thermomechanical Modelling and Simulation of C38 Thixoextrusion Steel

Influence of the chemical composition on the Thixoformability of steels

A Review on Thixoforming of High Melting Point Alloys

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