Effects of Phase Transformation in Hot Stamping of 22MnB5 High Strength Steel

Venturato, Giulia; Novella, Michele Francesco; Bruschi, Stefania; Ghiotti, Andrea; Shivpuri, Rajiv

doi:10.1016/j.proeng.2017.04.045

Cited by 31 publications

(26 citation statements)

References 10 publications

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“…2, the CCT diagram of 22MnB5 is shown. Studies regarding this material have concluded that the critical cooling rate to achieve a full martensite transformation is 30°C /s [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Review on additive manufacturing of tooling for hot stamping

Chantzis

Liu

Politis

et al. 2020

Int J Adv Manuf Technol

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Sustainability is a key factor in an automotive OEMs' business strategy. Vehicle electrification in particular has received increased attention, and major manufacturers have already undertaken significant investments in this area. However, in order to fully confront the sustainability challenge in the automotive industry, lightweight design in additional to alternative propulsion technologies is also required. Vehicle weight is closely correlated with fuel consumption and range for internal combustion and electrified vehicles, respectively, and therefore, weight reduction is a primary objective. Over the past decades, advanced steel and aluminium-forming technologies have seen considerable development, resulting in significant weight reduction of vehicle components. Hot stamping is one of the most established processes for advanced steel and aluminium alloys. The process offers low-forming loads and high formability as well as parts with high strength and minimal springback. However, the high temperatures of the formed materials over numerous cycles and the significant cooling required to ensure desirable component properties necessitate advanced tooling designs. Traditionally, casting and machining are used to manufacture tools; although in recent years, additive manufacturing has gained significant interest due to the design freedom offered. In this paper, a comprehensive review is performed for the state-of-the-art hot-forming tooling designs in addition to identifying the future direction of Additive Manufactured (AM) tools. Specifically, material properties of widely used tooling materials are first reviewed and selection criteria are proposed which can be used for the transition to AM tools. Moreover, key variables affecting the success of hot stamping, for example cooling rate of the component, are reviewed with the various approaches analysed by analytical and numerical techniques. Finally, a number of future directions for adopting additive manufacturing in the production of hot stamping tools are proposed, based on a thorough analysis of the literature.

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Section: Introductionmentioning

confidence: 99%

Review on additive manufacturing of tooling for hot stamping

Chantzis

Liu

Politis

et al. 2020

Int J Adv Manuf Technol

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“…The parts are formed using novel process known as the Hot Press Forming (HPF) [2]. In HPF, 22MnB5 blank is heated and kept at a temperature of 950ºC which causes a formation of homogenous austenitic microstructure within the material [3,4]. The blank microstructure before the heating took place is ferriticpearlitic microstructure.…”

Section: Introductionmentioning

confidence: 99%

Effect of initial blank temperature in hot press forming towards 22MnB5 springback failure

Lai

Yahaya

et al. 2019

JMES

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The springback failure of ultra-high strength boron steel (22MnB5) in hot press forming (HPF) process was characterized under bending and membrane conditions. Hot press forming for U–shaped parts with ultra-high strength boron steel were experimented and simulated to study the effect of initial blank temperatures on springback failure in the automotive industry. The results specify the various preheated temperature of 22MnB5 blank effect toward springback occurrences with reference to hot press forming dies design. ANSYS Workbench was used to verify finite element (FE) simulations of the processes in order to consolidate the knowledge of springback. The validated numerical simulation model were used in analyzing the stress and strain distributions along the formed part in the FE models, it was found that the springback angle was related in averaging value throughout quenching, regardless of the forming conditions. Springback failure mainly caused dimension deviation in hot press form parts due to the impact of thermal restoring moments and quenching rate of hot press forming process.

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“…Steel sheets are heated in a roll furnace to approximately 950 °C to transform the microstructure to austenite. The heated steel sheet is then rapidly transferred and hot stamped thus creating strengths between 1,500 MPa to 2,000 MPa, reaching similar behaving parts compared to non-hot stamped parts with reduced masses [8][9][10][11]. Another approach to reduce vehicle structure mass is the use of high performance FRP [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Thermal Behavior of Polymer Metal Hybrids of Hot Stamped Steel and Fiber-Reinforced Thermoplastics

Demes¹,

Künh²,

Gebken³

et al. 2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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Hot stamping constitutes a manufacturing process for both high strength and lightweight automotive structural components and is used to produce some 40 % of today's structural components in car bodies. Lightweight approaches aim at weight reduction by reducing steel thickness and applying fiber-reinforced plastics (FRP) to regain structural stiffness and strength. Inherent thermal metal processing renders hot stamping an adequate process chain for the manufacturing of hybrid metal polymer composites. Thereby, residual heat in metal parts is used to enhance adhesion between polymer and metal. In fact, the temperature of the parts after hot stamping is in the range of the processing temperatures of several technical polymers, thus providing process conditions suitable for thermal direct joining or activation of adhesion promoters. The temperature specification of the realized metal polymer composites equal specifications for vehicle bodies in the temperature range from-40 °C to + 80 °C. In this paper, the thermal behavior of polymer metal hybrids of hot stamped steel and FRP in means of deflection is investigated. Also the influence of mechanical interlocked and adhesively bonded hybrid specimens are investigated. Therefore, hybrid specimens are manufactured under realistic industrial conditions, varying the manufacturing process parameters. The specimens are tested with respect to temperature load investigating thermal expansion using optical measuring techniques.

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Effects of Phase Transformation in Hot Stamping of 22MnB5 High Strength Steel

Cited by 31 publications

References 10 publications

Review on additive manufacturing of tooling for hot stamping

Review on additive manufacturing of tooling for hot stamping

Effect of initial blank temperature in hot press forming towards 22MnB5 springback failure

Thermal Behavior of Polymer Metal Hybrids of Hot Stamped Steel and Fiber-Reinforced Thermoplastics

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