A process-performance coupled design method for hot-stamped tailor rolled blank structure

Cheng, Wei; Zhang, Huile; Fu, Shanshan; Xie, Hui; Tang, Zhixiang; Zhu, Zuqing

doi:10.1016/j.tws.2019.03.037

Cited by 22 publications

(10 citation statements)

References 54 publications

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“…Hence, the NSGA-II multi-objective optimization method is selected for further optimization. Based on the non-dominated sorting genetic algorithm (NSGA), K. Ded, and S. Agrawal optimized Pareto advance ability and proposed NSGA-II [26,27]. By calculating the whole Pareto front, the algorithm approximates the optimal solution in the solution domain.…”

Section: Procedures Of Multi-objective Optimization Based On Rsm and Nmentioning

confidence: 99%

Numerical Simulation and Multi-Objective Optimization of Partition Cooling in Hot Stamping of the Automotive B-Pillar Based on RSM and NSGA-II

Cui

Wang

et al. 2020

Metals

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In this study, the simulation and optimization of the partition cooling in the hot stamping process was carried out for an automotive B-pillar through minimizing the maximum thickening rate and the maximum thinning rate located in the rapid and slow cooling zones. The optimization was implemented by investigating the process parameters such as friction coefficient, sheet austenitizing temperature, holding time, heating zone temperature, the upper binder force and the lower binder force. The optimal Latin hypercube design (OLHD), the response surface methodology (RSM) and the non-dominated sorting genetic algorithm (NSGA-II) were combined to establish the relationship between process parameters and form quality objectives. After multi-objective optimization, the maximum thickening rate and the maximum thinning rate of the slow cooling zone and rapid cooling zone were 11.1% and 12.4%, 4.7% and 7.1%, respectively. Afterwards, the simulation was performed according to the optimized parameter combinations to analyze the temperature field, microstructure, tensile strength, hardness, thickening rate and thinning rate, and forming quality. Moreover, the hot stamping test and experimental results showed that the microstructure of the ferrite and pearlite structure was uniformly distributed in the slow cooling zone, and its tensile strength reached 680 MPa, the elongation was 11.4% and the hardness was 230.56 HV, while the lath martensite structure was obtained in the rapid cooling zone, with tensile strength of up to 1390 MPa, elongation of about 7.0% and hardness reaching 478.78 HV. The results of thickness, microstructure, tensile strength and the hardness test correspond well with the simulation results.

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Section: Procedures Of Multi-objective Optimization Based On Rsm and Nmentioning

confidence: 99%

Numerical Simulation and Multi-Objective Optimization of Partition Cooling in Hot Stamping of the Automotive B-Pillar Based on RSM and NSGA-II

Cui

Wang

et al. 2020

Metals

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“…Moreover, the low resistance force and the high formability of steel during hot forming can solve the problems of severe wearing and short life of die mold, which are common in the cold forming of high-strength steels [6]. To further improve crashworthiness and lightweight, hot-formed parts with tailored properties can be synthesized using different process control strategies, such as using a furnace with areas maintained at different temperatures and using tools with different temperatures or with different materials having different thermal conductivities [20,[37][38][39].…”

Section: Advantages and Disadvantages Of Hot Formingmentioning

confidence: 99%

Medium-Mn steels for hot forming application in the automotive industry

Luo

2021

Int J Miner Metall Mater

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Advanced high-strength steels have been widely used to improve the crashworthiness and lightweight of vehicles. Different from the popular cold stamping, hot forming of boron-alloyed manganese steels, such as 22MnB5, could produce ultra-high-strength steel parts without springback and with accurate control of dimensions. Moreover, hot-formed medium-Mn steels could have many advantages, including better mechanical properties and lower production cost, over hot-formed 22MnB5. This paper reviews the hot forming process in the automotive industry, hot-formed steel grades, and medium-Mn steel grades and their application in hot forming in depth. In particular, the adaptabilities of medium-Mn steels and the presently popular 22MnB5 into hot forming were compared thoroughly. Future research should focus on the technological issues encountered in hot forming of medium-Mn steels to promote their commercialization.

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“…Tailor rolled blank (TRB) has the advantages of continuous thickness change and the length of transition zone can be controlled artificially, and therefore, TRB of boron steel has greater application value in automotive lightweight [3]. Compared with tailorwelded blank (TWB) structure, TRB structure allows continuous thickness variation for thin and thick zones which results in a better formability and surface quality [4].…”

Section: Introductionmentioning

confidence: 99%

Hot Stamping of a TRB Part in an Electric MPV Vehicle

Chen¹,

Yang²,

Liu³

et al. 2023

Atlantis Highlights in Materials Science and Technology

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Automobile lightening is a direct and effective measure to realize energy saving and emission reduction. TRB of boron steel has greater application value in automotive lightweight. In this work, the TRB scheme of a down plate of rear stringer with thickness of 1.8 mm, 2.0 mm, 1.6 mm and 1.4 mm was designed, and the weight of the vehicle was reduced by 3 kg. Then the numerical simulation of hot stamping process of this TRB part was carried out, and finally the TRB part was hot stamped. The simulation results indicated that there were no major defects after the forming of the part and the strength and hardness reached the expected values. All the tested hardness values of the hot stamped TRB part were above 480 HV, and all the tested yield strength and tensile strength of the TRB part were above 950 MPa and 1300 MPa, respectively.

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A process-performance coupled design method for hot-stamped tailor rolled blank structure

Cited by 22 publications

References 54 publications

Numerical Simulation and Multi-Objective Optimization of Partition Cooling in Hot Stamping of the Automotive B-Pillar Based on RSM and NSGA-II

Numerical Simulation and Multi-Objective Optimization of Partition Cooling in Hot Stamping of the Automotive B-Pillar Based on RSM and NSGA-II

Medium-Mn steels for hot forming application in the automotive industry

Hot Stamping of a TRB Part in an Electric MPV Vehicle

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