Inverse characterization method for mechanical properties of strain/strain-rate/temperature/temperature-history dependent steel sheets and its application for hot press forming

2015 ◽  
Vol 21 (5) ◽  
pp. 874-890 ◽  
Author(s):  
Hyunki Kim ◽  
Dongun Kim ◽  
Kanghwan Ahn ◽  
Donghoon Yoo ◽  
Hyun-Sung Son ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Temperature History ◽  
Hot Press ◽  
Steel Sheets ◽  
Press Forming ◽  
Hot Press Forming

Experimental Assessment of High Temperature Formability of Boron Steel Sheet Manufactured With a Spring Compound Bending Die

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Yang Li ◽  
Yong-Phil Jeon ◽  
Chung-Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Heating Temperature ◽  
Boron Steel ◽  
Hot Press ◽  
Forming Process ◽  
Steel Sheets ◽  
Press Forming ◽  
Bending Process ◽  
Tension Testing ◽  
Hot Press Forming

Bending behavior occurs in the hot press forming process, resulting in many cases of failure during forming. To address the problem of cracking and improve the formability and mechanical properties of boron steel sheets in the bending process, an experiment has been carried out by using a spring compound bending die. Also, a comparison has been made between the traditional U-bending die and the spring compound bending die with regard to formability. The influence of the parameters for hot press forming such as the heating temperature, punch speed, and die radii on the mechanical properties and microstructure was analyzed by tension testing and metallographic observations.

Simulation of Thermal Distortion in Hot Press Forming with Dissimilar Material TWB

2014 ◽  
Vol 1063 ◽  
pp. 330-333
Author(s):  
Hyun Ho Bok ◽  
Jong Won Choi ◽  
Myoung Gyu Lee ◽  
Frédéric Barlat ◽  
Dong Jin Kim
Keyword(s):  
Shape Change ◽  
Element Model ◽  
Boron Steel ◽  
Air Cooling ◽  
Thermal Distortion ◽  
Hot Press ◽  
Steel Sheets ◽  
Press Forming ◽  
Hot Press Forming ◽  
Micro Alloyed Steel

In order to predict the shape change in hot press forming of a TWB made with HPF1470 boron steel and HSLA340 micro-alloyed steel sheets, a coupled thermo-mechanical-metallurgical finite element model was developed to simulate the process. The simulation consisted of air cooling, forming, die-quenching and, finally, by a treatment designed to relax residual stresses. It is shown in this paper that the experimentally observed distortion in the TWB part was reasonably captured by the simulations.

Effects of untransformed ferrite on Charpy impact toughness in 1.8-GPa-grade hot-press-forming steel sheets

2017 ◽  
Vol 707 ◽  
pp. 65-72 ◽  
Author(s):  
Min Cheol Jo ◽  
Jaeyeong Park ◽  
Seok Su Sohn ◽  
Seongwoo Kim ◽  
Jinkeun Oh ◽  
...  
Keyword(s):  
Impact Toughness ◽  
Charpy Impact ◽  
Hot Press ◽  
Steel Sheets ◽  
Charpy Impact Toughness ◽  
Press Forming ◽  
Hot Press Forming

The Effect of Cooling Rate on Mechanical Properties of 22MnB5 Steel Sheet during Hot Press Forming

2011 ◽  
Vol 264-265 ◽  
pp. 241-247 ◽  
Author(s):  
Ki Young Kwon ◽  
Nak Hyun Kim ◽  
Chung Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Steel Sheet ◽  
Cooling Water ◽  
High Strength Steels ◽  
High Strength ◽  
Hydraulic Press ◽  
Boron Steel ◽  
Hot Press ◽  
Press Forming ◽  
Hot Press Forming

There has been a growing usage of high strength steels (HSS), particularly in automobile applications mainly as structural parts in view of their light weight and high strength properties. These materials are also being considered for dynamic applications. However, the multi-phase microstructure, which is at the base of the strengthening mechanisms in most of these steels, leads to unacceptably high stresses during forming and significant springback phenomena, thus making traditional sheet metal forming technologies unsuitable. To avoid the disadvantages, a new process method was introduced – Hot Press Forming. Hot press forming (HPF) process is a forming method which can provide various advantages such as excellent mechanical properties and formability, good weldability and little springback. Here, the experiment parameters which include locations of the cooling holes and the flow rate of the cooling water play an important role in the HPF process. In this paper, the Al-Si coated boron steel sheet was researched by heating it up to 930oC for 5 min and formed by a hydraulic press. In this study, microstructural evolutions and the associated mechanical properties were investigated in terms of the flow rates of the cooling water.

Aluminide Coating Formation on Hot Press Forming Steels

2010 ◽  
Vol 654-656 ◽  
pp. 326-329
Author(s):  
Dong Wei Fan ◽  
Han Soo Kim ◽  
Rho Bum Park ◽  
Bruno C. De Cooman
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
High Temperature Oxidation ◽  
Aluminide Coating ◽  
New Method ◽  
Hot Press ◽  
Temperature Oxidation ◽  
Press Forming ◽  
Coating Formation ◽  
Hot Press Forming

In the present work, the formation of an aluminide coating prior to Hot Press Forming (HPF) was investigated. It was found that the formation of Fe3Al phases could suppress coating degradation during the HPF process. This new method was studied as a way to simultaneously improve the coating ductility and achieve a good hot corrosion resistance. In this new method, the conventional type1 aluminized coating was transformed into an aluminide coating. This aluminide coating protects the steel from high temperature oxidation and enables its plastic deformation at high temperature. The effect of this new solution on the mechanical properties of HPF steel is reviewed in detail.

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