Experimental investigation of the tribological behavior and wear mechanisms of tool steel grades in hot stamping of a high-strength boron steel

Boher, Christine; Roux, Sabine Le; Penazzi, Luc; Dessain, Christine

doi:10.1016/j.wear.2012.07.001

Cited by 73 publications

(36 citation statements)

References 12 publications

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“…They explained the observed behavior with the diffusion phenomena of Fe and Al which are strongly influenced by the temperature. Several investigations like [15] and [16] measured increased adhesive wear due to increased contact pressure, which would contradict to the results of the current study. However, it has to be pointed out that the referenced studies observed the increased adhesive wear at the die radius.…”

Section: Discussioncontrasting

confidence: 99%

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Schwingenschlögl

Weldi

Merklein

2017

J. Phys.: Conf. Ser.

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Abstract. Current challenges like increasing safety standards and reducing fuel consumption motivate lightweight construction in modern car bodies. Besides using lightweight workpiece materials like aluminum, hot stamping has been established as a key technology for producing safety relevant components. Producing hot stamped parts out of ultra-high strength steels offers the possibility to improve the crash performance. At the same time the weight of car structure is reduced by using thinner sheet thicknesses. In order to avoid oxide scale formation and ensure corrosion protection, AlSi coatings are commonly deposited on the sheet surfaces used for direct hot stamping. This workpiece coating has a critical impact on the tribological conditions within the forming process and, as a consequence, influences the quality of hot stamped parts as well as tool wear. AlSi coatings have been identified as major reason for adhesive wear, which represents the main wear mechanism in hot stamping. Within this study, the influence of the process parameters on adhesive wear are investigated in dependency of workpiece and tool temperatures, drawing velocities and contact pressures. The tribological behavior is analyzed based on strip drawing experiments under direct hot stamping conditions. The experiments are performed with AlSi coated 22MnB5 in contact with the hot working tool steel 1.2367. For analyzing the amount of adhesion on the friction jaws, the surfaces are characterized by optical measurements. The experiments indicate that higher workpiece temperatures cause severe adhesive wear on the tool surface, while an increase of drawing velocity or contact pressure led to reduced adhesion. The measured friction coefficients decreased with rising amount of adhesion and remained at a constant level after a certain adhesive layer was built up on the tool surface.

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Section: Discussioncontrasting

confidence: 99%

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Schwingenschlögl

Weldi

Merklein

2017

J. Phys.: Conf. Ser.

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“…Since hot stamping tools are subjected to high temperatures, the wear of tool steels and the prevailing wear mechanisms have been studied in detail [2,3]. Several authors have also studied wear behaviour in friction processes using specific tribological tests, in order to characterize different tool steel grades, with and without coatings, at elevated temperatures [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Wear and Friction Evaluation of Different Tool Steels for Hot Stamping

Muro

Artola

Gorriño

et al. 2018

Advances in Materials Science and Engineering

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e aim of this work is to investigate the durability of tool steels for hot stamping by comparing the wear resistance of three hot work tool steels. Friction and wear behaviours of different tool steels sliding against a 22MnB5 uncoated steel at elevated temperatures were investigated using a high-temperature version of the Optimol SRV reciprocating friction and wear tester at temperatures of 40 and 200°C. Our results show that friction decreased with increasing temperature, whereas wear of the tool steel increased with temperature for the second and the third tested tool steels. e slightly better wear behaviour of steel specimen 1 comes from the hardness of the carbides in the martensitic microstructure, which are rich in vanadium.

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“…Conversely, fewer investigations have been focused on the development of new tool steels grades capable to improve the wear resistance and the thermal properties that are required for the in-die quenching during forming. Using a laboratory pilot plant based on a deep drawing process simulator at elevated temperatures, C. Boher [11] and S. Le Roux [12] investigated commercial tool steels with different chemical compositions observing a material transfer mechanism due to the adhesion of the strip-coating particles during the hot-strip sliding. Unfortunately, the most common materials used to manufacture dies and tools are not designed for such purposes yet, and start to be a critical limit to speed up the processes.…”

Section: Introductionmentioning

confidence: 99%

Tribological performances of new steel grades for hot stamping tools

Medea

Venturato

Ghiotti

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. In the last years, the use of High Strength Steels (HSS) as structural parts in car bodyin-white manufacturing has rapidly increased thanks to their favourable strength-to-weight ratio and stiffness, which allow a reduction of the fuel consumption to accommodate the new restricted regulations for CO2 emissions control. The survey of the technical and scientific literature shows a large interest in the development of different coatings for the blanks from the traditional Al-Si up to new Zn-based coatings and on the analysis of hard PVD, CVD coatings and plasma nitriding applied on the tools. By contrast, fewer investigations have been focused on the development and test of new tools steels grades capable to improve the wear resistance and the thermal properties that are required for the in-die quenching during forming. On this base, the paper deals with the analysis and comparison the tribological performances in terms of wear, friction and heat transfer of new tool steel grades for high-temperature applications, characterized by a higher thermal conductivity than the commonly used tools. Testing equipment, procedures as well as measurements analyses to evaluate the friction coefficient, the wear and heat transfer phenomena are presented. Emphasis is given on the physical simulation techniques that were specifically developed to reproduce the thermal and mechanical cycles on the metal sheets and dies as in the industrial practice. The reference industrial process is the direct hot stamping of the 22MnB5 HSS coated with the common Al-Si coating for automotive applications. IntroductionThe increasing demand for fuel-efficient vehicles, improved safety, and crashworthiness [1], has led automotive industry to introduce new alloys in car manufacturing, characterized by a high stiffness and strength-to-weight ratio. To meet the need to form these new materials, hot stamping has been widely applied in the automotive industry [2] to produce car body-in-white parts with a high strength-to-weight ratio, which allows a reduction of the fuel consumption [3] and preserves the passengers' safety. Despite the advantages that the hot stamping leads in terms of (i) shorter process chain, especially in the case of direct hot stamping, (ii) increase of mechanical properties just after the deformation process and without the need of additional heat treatments, (iii) reduction of the total weight of the vehicles thanks to thinner components maintaining the frame stiffness, (iv) high shape precision [4], (v) absence of lubricants that are often hazardous for the environment and require expensive cleaning operations [5], friction and wear become particularly critical for the sheet sliding in the dies cavities and their service life [6] and the heating phase, with the subsequent inevitable contact with air during transport and forming, causes the oxidation and decarburization of the metal sheets [7]. For these reasons, the 22MnB5 steel sheets that

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Experimental investigation of the tribological behavior and wear mechanisms of tool steel grades in hot stamping of a high-strength boron steel

Cited by 73 publications

References 12 publications

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Investigation of the influence of process parameters on adhesive wear under hot stamping conditions

Wear and Friction Evaluation of Different Tool Steels for Hot Stamping

Tribological performances of new steel grades for hot stamping tools

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