Localized Austenitizing of the Blank to Make Tailored-Properties by Induction Heating

2014 ◽  
Vol 1063 ◽  
pp. 190-193
Author(s):  
Pei Xing Liu ◽  
Hong Liang Yi ◽  
Ya Xu ◽  
Yi Lin Wang ◽  
Yi Sheng Zhang
Keyword(s):  
Temperature Field ◽  
Ambient Temperature ◽  
Induction Heating ◽  
Thermal Conduction ◽  
Hot Stamping ◽  
High Strength ◽  
Mold Design ◽  
Austenitizing Temperature ◽  
Stamping Process ◽  
Local Areas

In this research, a novel hot stamping process to make tailored-properties is proposed. The local areas of blank are heated by induction heating. In the high strength zones, they are heated to austenitizing temperature, and in the absorption zones without heating. The temperature field of transition zone is determined by the thermal conduction between austenitizing temperature and ambient temperature. This novel process can be used for industrialization without changing mold design and stamping process.

Simulation of Die Gap Variation in Temperature Field Distribution of High Strength Steel Hot Stamping Process

2013 ◽  
Vol 652-654 ◽  
pp. 2048-2052 ◽  
Author(s):  
Shu Lai Chen ◽  
Yu Jun Cai ◽  
Guo He Li ◽  
Zhi Gang Liu
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
High Strength Steel ◽  
Thickness Distribution ◽  
Hot Stamping ◽  
High Strength ◽  
Cooling Efficiency ◽  
Temperature Field Distribution ◽  
Simulation Accuracy ◽  
Stamping Process

In the hot stamping process, die gap may affect cooling efficiency of the die and the condition of stress-strain. When other conditions are same, die gap were taken for 0.9t, t, 1.1 t, 1.2 t, t is sheetthickness. Temperature field and thickness distribution of the parts are simulated by ANSYS/LS-DYNA module, it is discovered that the distribution of temperature and thickness is uniform when the die gap is 1t and 1.1t. Finally, an experimental is designed to verify the simulation accuracy.

scholarly journals Evolution of Phase Transition and Mechanical Properties of Ultra-High Strength Hot-Stamped Steel During Quenching Process

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 138 ◽  
Author(s):  
Shuang Liu ◽  
Mujun Long ◽  
Songyuan Ai ◽  
Yan Zhao ◽  
Dengfu Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Cooling Rate ◽  
Hot Stamping ◽  
Coupled Model ◽  
High Strength ◽  
Austenitizing Temperature ◽  
Stamping Process ◽  
Quenching Process ◽  
Hot Stamping Steel

Hot stamping process is widely used in the manufacture of the high strength automotive steel, mainly including the stamping and quenching process of the hot-formed steel. In the hot stamping process, the steel is heated above the critical austenitizing temperature, and then it is rapidly stamped in the mold and the quenching phase transition occurs at the same time. The quenching operation in the hot stamping process has a significant influence on the phase transition and mechanical properties of the hot-stamping steel. A proper quenching technique is quite important to control the microstructure and properties of an ultra-high strength hot-stamping steel. In this paper, considering the factors of the austenitizing temperature, the austenitizing time and the cooling rate, a coupled model on the thermal homogenization and phase transition from austenite to martensite in quenching process was established for production of ultra-high strength hot-stamping steel. The temperature variation, the austenite decomposition and martensite formation during quenching process was simulated. At the same time, the microstructure and the properties of the ultra-high strength hot-stamping steel after quenching at different austenitizing temperature were experimental studied. The results show that under the conditions of low cooling rate, the final quenching microstructure of the ultra-high strength hot-stamping steel includes martensite, residual austenite, bainite and ferrite. With the increase of the cooling rate, bainite and ferrite gradually disappear. While austenitizing at 930 °C, the tensile strength, yield strength, elongation and strength-ductility product of the hot-stamping steel are 1770.1 MPa, 1128.2 MPa, 6.72% and 11.9 GPa%, respectively.

Emissivity Calibration and Temperature Measurement of High Strength Steel Sheet in Hot Stamping Process

2011 ◽  
Vol 148-149 ◽  
pp. 1473-1477
Author(s):  
Hong Qing Li ◽  
Yi Sheng Zhang ◽  
Liang Wang ◽  
Xiao Wei Tian ◽  
Chao Wang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Temperature Measurement ◽  
Infrared Thermography ◽  
High Strength Steel ◽  
Hot Stamping ◽  
High Strength ◽  
Calibration Method ◽  
Stamping Process ◽  
Reliability Of Measurement Results ◽  
The Impact

In order to meet the requirements of improving hot stamping process, the temperature distribution of high strength steel (HSS) sheets should be observed. However, the accurate measurement of temperature field in transfer where the temperature falls rapidly proves to be difficult due to the limitation of thermocouple. The infrared thermography could be used for accurate measurement of temperature field but the emissivity which is crucial to the accuracy and reliability of measurement results is not available. In this paper, a method to calibrate emissivity of HSS blank was developed for temperature measurement in hot stamping using infrared thermography. Experiments were performed on the emissivity calibration of the HSS Advanced 1500 in hot stamping. Emissivity dependence on temperature was investigated, so was the impact of little variation in emissivity on the temperature measurement. The validation tests were made and the results reveal that this calibration method of emissivity is accurate and feasible. This method is also appropriate for the calibration of emissivity in other temperature measurement situations.

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 Multilayered-Sheet Hot Stamping and Application in Electric-Power-Fitting Products

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 215 ◽  
Author(s):  
Bin Zhu ◽  
Zhoujie Zhu ◽  
Yongmin Jin ◽  
Kai Wang ◽  
Yilin Wang ◽  
...  
Keyword(s):  
Contact Pressure ◽  
Load Capacity ◽  
Hot Stamping ◽  
High Strength ◽  
Optimal Number ◽  
Electrical Connection ◽  
Number Of Layers ◽  
Stamping Process ◽  
New Type ◽  
High Load Capacity

Traditional electric transmission line fittings, which are always manufactured from thick metal slabs, possess the disadvantage of heavy weight. In this study, a new type of electrical-connection-fitting, clevis-clevis component made of high-strength steel is developed to reduce weight, and a new hot-stamping process for multilayered sheets is proposed to manufacture the component efficiently. First, the structure of the new clevis-clevis component is designed, and the corresponding tool is developed. Second, a flat-tool heat transfer experiment is conducted. The influence of the number of layers and contact pressure on the cooling rate of each sheet is investigated. The optimizing number of layers and contact pressure for the multilayered-sheet, hot-stamping process are obtained. The optimal number of layers is two, and the optimal contact pressure is more than 20 MPa. The final microstructure of each sheet is fully martensitic, and the strength is about 1500 MPa. Finally, U-shaped, double-layer-sheet hot stamping is implemented to produce a typical electrical-connection-fitting, clevis-clevis component. The bearing capacity of a four-layered clevis-clevis is tested through numerical and experimental methods. The new connection-fitting clevis-clevis component exhibits a high load capacity of 280 kN. Compared with that of the traditional component, the weight of the new component is reduced by 60%.

Numerical Simulation Investigation on the Temperature Field Distribution and Variations in Hot Stamping Process

2010 ◽  
Vol 44-47 ◽  
pp. 992-996
Author(s):  
Lei Zhang ◽  
Guo Qun Zhao ◽  
Hui Ping Li
Keyword(s):  
Temperature Field ◽  
Field Distribution ◽  
Hot Stamping ◽  
Water Channel ◽  
Cooling Water ◽  
Temperature History ◽  
Temperature Field Distribution ◽  
Finite Element Software ◽  
Stamping Process ◽  
Die Surface

With finite element software Abaqus, a coupled thermal mechanical simulation of hot stamping process of U-Channel part using high strength steel was performed. Through the analysis of the temperature field distribution on the die surface, the influence of contact state between die and blank on the temperature field distribution was discussed. With temperature history curve of a selected node on die corner, the heat flow on two contact boundaries (die surface and cooling water channel surface) was discussed and its effects rules on the die temperature were given.

Computer Simulation of Hot Stamping Process of DP Steel Car Bumper Chain Based on Dynaform

2012 ◽  
Vol 178-181 ◽  
pp. 2877-2880
Author(s):  
Han Wu Liu ◽  
Zhao Hui Liu ◽  
Hui Xiao Li ◽  
Shao Bo Ping
Keyword(s):  
Metal Forming ◽  
Steel Plate ◽  
Hot Stamping ◽  
High Strength ◽  
Spring Back ◽  
Temperature Field Distribution ◽  
Dp Steel ◽  
Performance Requirements ◽  
Stamping Process ◽  
Duplex Steel

Owing to the advantages of weight loss and security, duplex steel plate has been the priority for the saloon car body instead of ordinary one among a majority of engine factories. While there are undesirable phenomena because of its high strength at normal temperature, such as its formability is worsened dramatically, and failure and fracture always occur in the stamping. So hot stamping process must be adopted to make the formability available. Based on the Bumper chain of Beijing Hyundai Reina and taken DP600 high strength steel as research object, this paper analyzes the distributions of stress, strain and thickness changes during the process of sheet metal forming by using eta/DYNAFORM software, simulates the spring-back quantity after hot stamping forming, and the numerical simulation of the temperature field distribution with time during stamping process was done. The result shows that duplex steel plate can meet the performance requirements of automotive chain forming, which offers theory basis for the production of such parts.

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