Understanding and Avoiding Intergranular Fracture Characteristics of Hadfield/Hot-Press-Forming Multi-Layer Steel Sheets

2019 ◽  
Vol 50 (9) ◽  
pp. 4085-4097 ◽  
Author(s):  
Min Cheol Jo ◽  
Jaeyeong Park ◽  
Gyeongbae Park ◽  
Hyeok Jae Jeong ◽  
Taejin Song ◽  
...  
Keyword(s):  
Intergranular Fracture ◽  
Hot Press ◽  
Fracture Characteristics ◽  
Steel Sheets ◽  
Press Forming ◽  
Hot Press Forming ◽  
Layer Steel

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.

Ultra-high strength and excellent ductility in multi-layer steel sheet of austenitic hadfield and martensitic hot-press-forming steels

2019 ◽  
Vol 759 ◽  
pp. 320-328 ◽  
Author(s):  
Jaeyeong Park ◽  
Min Cheol Jo ◽  
Taejin Song ◽  
Hyoung Seop Kim ◽  
Seok Su Sohn ◽  
...  
Keyword(s):  
Steel Sheet ◽  
High Strength ◽  
Hot Press ◽  
Press Forming ◽  
Hot Press Forming ◽  
Layer Steel

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
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