A methodology and new criteria to quantify the adhesive and abrasive wear damage on a die radius using white light profilometry

Roux, Sabine Le; Boher, Christine; Penazzi, Luc; Dessain, Christine; Tavernier, B.

doi:10.1016/j.triboint.2012.02.018

Cited by 12 publications

(8 citation statements)

References 11 publications

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“…In addition, SG2 and SG3 present the same cyclical trend in both tests. It should thus be emphasized that a particularly high reproducibility is found between the two test campaigns, indicating the high reliability of the DDPS pilot [11].…”

Section: Adhesion Behavior Of Die Materialsmentioning

confidence: 86%

“…A methodology was proposed and new damage criteria, based on profilometric measurements, were defined to assess the relative amount of adhesion and abrasion on the die radius surface [11]. On each sub-angular section, three profiles were measured along the longitudinal direction of the die radius, using a white-light confocal microscope.…”

Section: Characterization Of the Wear Damagementioning

confidence: 99%

“…As the damage (especially the adhesive wear) is highly localized at the boundary between sub-angular sections 1 and 2 on the die radius, the standard deviations are not representative of the results trend. A study on the reproducibility and reliability of the damage criteria is presented and discussed in [11].…”

Section: Wear Damage and Ranking Of Die Materialsmentioning

confidence: 99%

“…The results are focused only on die-radius degradation, with the wear of the strip not being considered. A precise description of the measurement procedure and definition of the wear damage criteria is reported in [11].…”

Section: Introductionmentioning

confidence: 99%

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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

Boher

Roux

Penazzi

et al. 2012

Wear

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a b s t r a c tIn this study, the high temperature wear behavior of hot forming tool steel grades is investigated by successive sliding of a pre-alloyed Usibor1500P s strip heated at high temperature. Experimental tests are performed at high temperature on an instrumented Deep-Drawing Process Simulator (DDPS). This laboratory pilot is employed to rank different steel grades used as tool materials in the hot-stamping process. The wear damage of the tool (die radius) is characterized by profilometry and SEM observations, and three quantitative criteria are determined from 2D profile measurements to assess adhesive and abrasive wear. Under examined conditions at high temperature, a predominant transfer mechanism is observed, while abrasive wear appears as minor damage. When the surface hardness of the tool material is not great enough, the sub-surface of the die radius can exhibit a plastic shear deformation of about 10 mm in depth. This leads to emission of wear debris coming from the cumulated cyclic plastic deformation of the sub-surface. In contrast, for high surface hardness, the adhesive wear rapidly reaches an asymptotic state.

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Section: Adhesion Behavior Of Die Materialsmentioning

confidence: 86%

Section: Characterization Of the Wear Damagementioning

confidence: 99%

Section: Wear Damage and Ranking Of Die Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Boher

Roux

Penazzi

et al. 2012

Wear

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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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Tribology in metal forming at elevated temperatures

et al. 2015

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Abstract:The tribo-characteristics of metal forming at high temperatures have not yet been well understood due to the complex nature of thermal, microstructural, interaction, and process parameters. This is a review paper on the effects of temperature, coating, and lubrication to the tribological characteristics in hot forming as well as the tribometers for different metal forming processes at elevated temperatures mainly based on the experimental work. The tribological behaviors of oxides in hot forming, such as rolling and stamping, were reviewed and presented. Some commonly used surface coatings and lubricants in hot forming were given. Many types of tribometer were selected and presented and some of them provided a great potential to characterize friction and wear at elevated temperatures. Nevertheless, more testing conditions should be further investigated by developing new tribometers. Eventually, experimental results obtained from reliable tribometers could be used in theory and model developments for different forming processes and materials at high temperatures. The review also showed the great potential in further investigations and innovation in tribology.

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A methodology and new criteria to quantify the adhesive and abrasive wear damage on a die radius using white light profilometry

Cited by 12 publications

References 11 publications

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

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

Tribological performances of new steel grades for hot stamping tools

Tribology in metal forming at elevated temperatures

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