Fabrication of Hadfield-Cored Multi-layer Steel Sheet by Roll-Bonding with 1.8-GPa-Strength-Grade Hot-Press-Forming Steel

2018 ◽  
Vol 24 (3) ◽  
pp. 489-495 ◽  
Author(s):  
Kwang-Geun Chin ◽  
Chung-Yun Kang ◽  
Jaeyeong Park ◽  
Sunghak Lee
Keyword(s):  
Steel Sheet ◽  
Hot Press ◽  
Roll Bonding ◽  
Strength Grade ◽  
Press Forming ◽  
Hot Press Forming ◽  
Layer Steel

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

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.

Mechanical Property Degradation of Laser Welded Boron Steel Sheet in Hot Press Forming

2012 ◽  
Vol 13 (1) ◽  
pp. 447-450 ◽  
Author(s):  
Daeyong Kim ◽  
Ji Hoon Kim ◽  
M. G. Lee ◽  
Young Il Kim
Keyword(s):  
Mechanical Property ◽  
Steel Sheet ◽  
Boron Steel ◽  
Hot Press ◽  
Press Forming ◽  
Hot Press Forming

Resistance Heating Characteristics of High-Strength Steel Sheet Blank for Hot Press Forming

2007 ◽  
Vol 340-341 ◽  
pp. 749-754 ◽  
Author(s):  
Seijiro Maki ◽  
Yuuki Tanaka ◽  
Kenichiro Mori
Keyword(s):  
High Strength Steel ◽  
Steel Sheet ◽  
High Strength ◽  
Single Pair ◽  
Resistance Heating ◽  
Hot Press ◽  
Press Forming ◽  
Hot Press Forming ◽  
Blank Shape ◽  
Material Utilization

Resistance heating performance in some shaped blanks of high-strength steel sheet is examined by experiment and FE simulation, and the feasibility and effectiveness of the application of resistance heating to the hot press forming of high-strength steel sheet are discussed. The followings are made clear through this study. (1) A uniformly distributed current density is essential to uniform blank heating. (2) For a certain shaped blank, no matter how the electrodes are disposed, uniform blank heating is difficult. (3) A blank shape suitable for uniform heating by a single pair of parallel electrodes is restricted to a rectangle.(4) In case a uniformly heated blank is required, two-piece simultaneous forming with point-symmetric die layout is recommended from the viewpoint of material utilization.

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.

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