scholarly journals Study on Phase Transformation in Hot Stamping Process of USIBOR® 1500 High-Strength Steel

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1119 ◽  
Author(s):  
Pengyun Zhang ◽  
Le Zhu ◽  
Chenyang Xi ◽  
Junting Luo
Keyword(s):  
Phase Transformation ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Transformation Kinetics ◽  
Martensite Content ◽  
Cct Curve ◽  
Stamping Process ◽  
Quenching Process ◽  
Kinetics Of

Based on the Kirkaldy-Venugopalan model, a theoretical model for the phase transformation of USIBOR® 1500 high strength steel was established, and a graph of the phase transformation kinetics of ferrite, pearlite, and bainite were plotted using the software MATLAB. Meanwhile, with the use of the software DYNAFORM, the thermal stamping process of an automobile collision avoidance beam was simulated. The phase transformation law of USIBOR® 1500 high-strength steel during hot stamping was studied through a simulation of the phase transformation during the pressure holding quenching process. In combination with the continuous cooling transformation (CCT) curve, the cooling rate of quenching must be greater than 27 °C/s to ensure maximum martensite content in the final parts, and the final martensite content increases as the initial temperature of the sheet rises.

scholarly journals Thermomechanical-Phase Transformation Simulation of High-Strength Steel in Hot Stamping

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Wenhua Wu ◽  
Ping Hu ◽  
Guozhe Shen
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Phase Transformation ◽  
High Strength Steel ◽  
Hot Stamping ◽  
Constitutive Models ◽  
High Strength ◽  
Simulation Software ◽  
Transmission Model ◽  
Stamping Process

The thermomechanical-phase transformation coupled relationship of high-strength steel has important significance in forming the mechanism and numerical simulation of hot stamping. In this study a new numerical simulation module of hot stamping is proposed, which considers thermomechanical-transformation multifield coupled nonlinear and large deformation analysis. In terms of the general shell finite element and 3D tetrahedral finite element analysis methods related to temperature, a coupled heat transmission model for contact interfaces between blank and tools is proposed. Meanwhile, during the hot stamping process, the phase transformation latent heat is introduced into the analysis of temperature field. Next the thermomechanical-transformation coupled constitutive models of the hot stamping are considered. Static explicit finite element formulae are adopted and implemented to perform the full numerical simulations of the hot stamping process. The hot stamping process of typical U-shaped and B-pillar steel is simulated using the KMAS software, and a strong agreement comparison between temperature, equivalent stress, and fraction of martensite simulation and experimental results indicates the validity and efficiency of the hot stamping multifield coupled constitutive models and numerical simulation software KMAS. The temperature simulated results also provide the basic guide for the optimization designs of cooling channels in tools.

scholarly journals Modelling kinetics of phase transformation for the indirect hot stamping process to focus on car body parts with tailored properties

2016 ◽  
Vol 228 ◽  
pp. 59-67 ◽  
Author(s):  
Paul Hippchen ◽  
Arnulf Lipp ◽  
Hannes Grass ◽  
Philipp Craighero ◽  
Michael Fleischer ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Hot Stamping ◽  
Body Parts ◽  
Car Body ◽  
Stamping Process ◽  
Kinetics Of

Hybrid quenching method of hot stamping for automotive tubular beams

2015 ◽  
Vol 231 (9) ◽  
pp. 1599-1610 ◽  
Author(s):  
Jong-Kyu Park ◽  
Yang-Su Kim ◽  
Chang Hee Suh ◽  
Young-Suk Kim
Keyword(s):  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Torsion Beam ◽  
Stamping Process ◽  
Die Quenching ◽  
Ultra High Strength Steel ◽  
Quenching Method ◽  
Torsion Beam Axle ◽  
Beam Axle

Recently, tubular-type coupled torsion beam axle, which is a component of the automotive rear suspension systems, has been developed by using ultra-high strength steel. It is manufactured by hot stamping process to enhance the strength and reduce springback. The hot stamping process is classified as a direct method and an indirect method according to forming sequence and quenching method, so-called die quenching or water quenching. Each of these methods has limitations in the aspect of dimensional accuracy and strength. Hybrid quenching is a new quenching method which sprays water to the tube directly in addition to die quenching. In this study, direct hot stamping with hybrid quenching was applied to produce an automotive tubular coupled torsion beam axle of ultra-high strength steel. This study proposes a simulation method of hybrid quenching for tubular beam and the hybrid quenching method was evaluated experimentally. Finally, the proposed hybrid quenching method has been found very effective in reducing the cooling time and thermal deformation.

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

2017 ◽  
Vol 183 ◽  
pp. 316-321 ◽  
Author(s):  
Giulia Venturato ◽  
Michele Novella ◽  
Stefania Bruschi ◽  
Andrea Ghiotti ◽  
Rajiv Shivpuri
Keyword(s):  
Phase Transformation ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength

GPU Accelerated Finite Element Simulation for Ultra-High Strength Steel Quenching

2013 ◽  
Vol 842 ◽  
pp. 337-340
Author(s):  
Chao Wang ◽  
Bin Zhu ◽  
Liang Wang ◽  
Yi Lin Wang ◽  
Yi Sheng Zhang
Keyword(s):  
Finite Element ◽  
Latent Heat ◽  
High Strength Steel ◽  
Thermal Contact ◽  
Hot Stamping ◽  
High Strength ◽  
Heat Processing ◽  
Processing Unit ◽  
Ultra High Strength Steel ◽  
Quenching Process

During the hot stamping of ultra-high strength steel (UHSS), the quenching effect of the mold on the sheet plays an important role to achieve the transition from austenite to martensite. Thus a finite element model for the quenching process of UHSS is established in this paper. The key points of the model include contact thermal conduction and the latent heat processing of phase transforming. Finite element program has been developed to calculate the temperature field of the UHSS quenching process, and temperature measurement device was used to get the temperature-time curve of the mold and the sheet to validate the calculation results. It can be concluded that the latent heat and thermal contact resistance have a critical influence on the temperature filed of the sheet during the hot stamping process. Finally, the parallel computation technology based on GPU(Graphics processing unit) was adopted to accelerate the calculation.

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