Influence of surface oxide on mechanical properties of laser-welded hot-press-forming steel with strength of 1.8 GPa

2018 ◽  
Vol 30 (3) ◽  
pp. 032415
Author(s):  
Minjung Kang ◽  
Cheolhee Kim
Keyword(s):  
Mechanical Properties ◽  
Surface Oxide ◽  
Hot Press ◽  
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.

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.

scholarly journals Microstructure and Mechanical Properties of Laser Welded Al-Si Coated Hot-Press-Forming Steel Joints

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3294 ◽  
Author(s):  
Xi Chen ◽  
Zhenglong Lei ◽  
Yanbin Chen ◽  
Meng Jiang ◽  
Ze Tian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Laser Power ◽  
Welding Process ◽  
High Strength ◽  
Hot Press ◽  
Press Forming ◽  
Hot Press Forming ◽  
Steel Joints ◽  
Qualification Rate

High strength steel has attracted a lot of attention due to its excellent advantage of weight reduction. A thin Al-Si coating covered on the surface of hot-press-forming (HPF) steel offers functions of antioxidation and decarburization under high temperature processing conditions. In this study, the microstructure characteristic, phase, microhardness, and tensile strength of laser welded Al-Si coated HPF steel joints were investigated at different laser powers. Experimental results show that the welding process becomes unstable because of metallic vapor generated by ablation of the coating. Some of the white bright rippled Fe-Al phase was observed to be distributed in the fusion zone randomly. It is found that microhardness, tensile strength, and cupping test qualification rate decreases with the increase of the laser power. For the 1.1 kW laser power, the sound weld performs the best mechanical properties: Microhardness of 466.53 HV and tensile strength of 1349.9 MPa.

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