Electrochemical Corrosion and Hydrogen Diffusion Behaviors of Zn and Al Coated Hot-Press Forming Steel Sheets in Chloride Containing Environments

2018 ◽  
Vol 28 (5) ◽  
pp. 286-294
Author(s):  
Jin-seong Park ◽  
Ho Jong Lee ◽  
Sung Jin Kim
Keyword(s):  
Hydrogen Diffusion ◽  
Electrochemical Corrosion ◽  
Hot Press ◽  
Steel Sheets ◽  
Press Forming ◽  
Hot Press Forming ◽  
Diffusion Behaviors

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

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

scholarly journals Study on Hot Press Forming Process of Large Curvilinear Generatrix Workpiece of Ti55 High-Temperature Titanium Alloy

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 827 ◽  
Author(s):  
Fengyong Wu ◽  
Wenchen Xu ◽  
Zhongze Yang ◽  
Bin Guo ◽  
Debin Shan
Keyword(s):  
Titanium Alloy ◽  
High Temperature ◽  
Fem Simulation ◽  
Alloy Sheet ◽  
Rolled Sheet ◽  
Strain Rates ◽  
Hot Press ◽  
Forming Process ◽  
Press Forming ◽  
Hot Press Forming

In order to manufacture complex curvilinear generatrix workpieces of high-temperature titanium alloy, the hot tensile behavior of Ti55 alloy sheet was tested and the hot press forming process was investigated using Finite Element Method (FEM) simulation and experiment. The hot tensile experiments of Ti55 rolled sheet were conducted at the temperatures of 800–900 °C with the strain rates of 0.001–0.1 s−1. According to the results of hot tensile tests and microstructure evolution, the proper hot press forming parameters were determined as the temperature of 850 °C and the strain rates of 0.001–0.01 s−1. The wrinkling mechanism in the transition region was analyzed and the initial blank sheet geometry was optimized by FE simulation of hot press forming. The two-step hot press forming process was better to produce the complex sheet workpiece of Ti55 alloy than the one-step hot forming scheme, which could restrain the wrinkling trend and ensure the microstructure and mechanical properties of the hot formed workpieces.

Fabrication of Binder-Free Green Composite Using Bamboo Fibers Extracted with a Machining Center

2010 ◽  
Vol 447-448 ◽  
pp. 760-764 ◽  
Author(s):  
Keiji Ogawa ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Mitsuaki Taniguchi ◽  
Sachiko Ogawa
Keyword(s):  
Present Report ◽  
Bamboo Fiber ◽  
Hot Press ◽  
Green Composite ◽  
Forming Process ◽  
Machining Center ◽  
Press Forming ◽  
Hot Press Forming ◽  
Binder Free ◽  
Bamboo Fibers

Bamboo grows faster than other renewable natural materials. Bamboo fiber, in particular, has attracted attention as an environmentally superior material. Therefore, we proposed a sustainable manufacturing system using bamboo. An extraction method of bamboo fibers end-milled using a machining center with in-situ measurement is proposed. Bamboo fibers with high precision shape are efficiently acquired. In the present report, we propose the fabrication of binder-free composite by a hot press forming method that only uses bamboo fibers extracted by a machining center. We experimentally demonstrated various hot press forming conditions and achieved proper forming conditions to optimize the forming process. We also made various three-dimensional shapes considering the practical applications of the formed binder-free bamboo fiber moldings.

Sign in / Sign up

Export Citation Format

Share Document