scholarly journals Evaluation of Mechanical Properties and Microstructures of Molybdenum and Niobium Microalloyed Thermomechanically Rolled High-Strength Press Hardening Steel

JOM ◽  
2019 ◽  
Vol 71 (7) ◽  
pp. 2405-2412
Author(s):  
Jaakko Hannula ◽  
David A. Porter ◽  
Antti Kaijalainen ◽  
Jukka Kömi
Keyword(s):  
Mechanical Properties ◽  
High Strength ◽  
Press Hardening ◽  
Press Hardening Steel

Effects of Austenitizing Temperature on Microstructure and Properties of Hot-Formed Steel

2014 ◽  
Vol 1063 ◽  
pp. 88-92 ◽  
Author(s):  
He Long Cai ◽  
Peng Ju Du ◽  
Hong Liang Yi ◽  
Di Wu
Keyword(s):  
Mechanical Properties ◽  
Hot Stamping ◽  
High Strength ◽  
Hardened Steel ◽  
Austenitizing Temperature ◽  
Austenitization Temperature ◽  
Press Hardening ◽  
Automotive Structures ◽  
Body In White ◽  
Press Hardening Steel

Press hardening steel is the best solution for application of extremely high strength steel in automotive structures in order to reduce the weight of body-in-white. Effect of austenitizing temperature on the grain coarsening of a press hardening steel has been investigated by using dilatometer at first. The mechanical properties of press-hardened steel austenitized at temperature between 850 to 950oC by using a pilot hot stamping line have been investigated. The strength, especially the ultimate tensile strength, was improved by the grain refinement with lower austenitization temperature.

Influence of vanadium on the hydrogen embrittlement of aluminized ultra-high strength press hardening steel

2018 ◽  
Vol 735 ◽  
pp. 448-455 ◽  
Author(s):  
Lawrence Cho ◽  
Eun Jung Seo ◽  
Dimas H. Sulistiyo ◽  
Kyoung Rae Jo ◽  
Seong Woo Kim ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
High Strength ◽  
Press Hardening ◽  
Press Hardening Steel

scholarly journals Characterization of Phase Transformations During Graded Thermo-Mechanical Processing of Press-Hardening Sheet Steel 22MnB5

2020 ◽  
Vol 51 (11) ◽  
pp. 5628-5638
Author(s):  
A. Reitz ◽  
O. Grydin ◽  
M. Schaper
Keyword(s):  
Phase Transformations ◽  
Sheet Steel ◽  
Steel Specimen ◽  
High Strength ◽  
High Energy ◽  
Mechanical Processing ◽  
Press Hardening ◽  
Flat Steel ◽  
High Energy Absorption ◽  
Press Hardening Steel

Abstract Safety-relevant components in automobiles require materials that combine high strength with sufficient residual ductility and high-energy absorption. A graded thermo-mechanical treatment of the press-hardening steel 22MnB5 with graded microstructure can provide a material with such properties. Different austenitization temperatures, cooling and forming conditions within a sheet part lead to the development of microstructures with mixed phase compositions. To determine the resulting phase contents in such graded processed parts, a large number of dilatometric tests are usually required. With a non-contact characterization method, it is possible to detect local phase transformations on an inhomogeneously treated flat steel specimen. For press-hardening steel after heat treatment and thermo-mechanical processing, correlations between austenitization temperature, hot deformation strain, microstructure, and hardness are established.

Hydrogen absorption and embrittlement of ultra-high strength aluminized press hardening steel

2018 ◽  
Vol 734 ◽  
pp. 416-426 ◽  
Author(s):  
Lawrence Cho ◽  
Dimas H. Sulistiyo ◽  
Eun Jung Seo ◽  
Kyoung Rae Jo ◽  
Seong Woo Kim ◽  
...  
Keyword(s):  
Hydrogen Absorption ◽  
High Strength ◽  
Press Hardening ◽  
Press Hardening Steel

Development of Niobium Alloyed Press Hardening Steel with Improved Properties for Crash Performance

2014 ◽  
Vol 1063 ◽  
pp. 7-20 ◽  
Author(s):  
Bian Jian ◽  
Li Wang ◽  
Hardy Mohrbacher ◽  
Hong Zhou Lu ◽  
Wen Jun Wang
Keyword(s):  
Transition Temperature ◽  
High Strength ◽  
Press Hardening ◽  
Brittle Transition ◽  
Delayed Cracking ◽  
Nb Microalloying ◽  
Brittle Transition Temperature ◽  
Ductile To Brittle Transition ◽  
Conventional Press ◽  
Press Hardening Steel

Press hardening steel has become a much used material in car body manufacturing due to its excellent safety and lightweight potential. In some recent car models press hardening steel has reached already a weight share of more than 20% in the body structure while it is estimated that it could reach even around 40% in the future. However conventional press hardening steel based on the alloying concept 22MnB5 was designed originally not for automotive application. In spite of the high strength level, press hardening steel has generally low toughness due to the relatively high carbon content and its martensitic microstructure. Particularly important is the ductile-to-brittle transition temperature at low temperature, which might lead to unexpected failure in cold climate regions. Furthermore, hydrogen embrittlement is a major concern in press hardening steel as previous results indicated that only a few ppm of hydrogen could induce delayed cracking. Generally it is important that impact energy should be absorbed by the material to avoid unexpected disintegration of the structure. This material capability is usually characterized by the toughness. All these characteristics have not yet been systematically investigated in press hardening steel. Consequently, no attempts have been made to optimize conventional press hardening steel for obtaining better toughness, lower ductile-to-brittle transition temperature and reduced sensitivity to hydrogen induced cracking.A generally proven approach of improving the resistance against brittle failure in high strength steel is the refinement of microstructure, which can be efficiently achieved by Nb microalloying. This paper will introduce modified alloy designs for press hardening steel and explain fundamentally the metallurgical effects of Nb microalloying on the improvement of crack propagation resistance, bendability and delayed cracking behavior induced by hydrogen penetration in press hardening steel. The results reveal better toughness, improved bending behavior and increased resistance against hydrogen embrittlement.

The effect of laser welding on microstructure and mechanical properties in heavy-gage press hardening steel alloys

2021 ◽  
pp. 141341
Author(s):  
Diego Tolotti de Almeida ◽  
Thomas Gabriel Rossauro Clarke ◽  
João Henrique Corrêa de Souza ◽  
William Haupt ◽  
Milton Sergio Fernandes de Lima ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Laser Welding ◽  
Steel Alloys ◽  
Press Hardening ◽  
Microstructure And Mechanical Properties ◽  
Press Hardening Steel

Thermo-Mechanical Hardening of Ultra High-Strength Steels

2013 ◽  
Vol 549 ◽  
pp. 133-140
Author(s):  
Werner Homberg ◽  
Tim Rostek
Keyword(s):  
Mechanical Properties ◽  
State Of The Art ◽  
High Strength Steels ◽  
High Strength ◽  
Heat Treatments ◽  
Press Hardening ◽  
Martensitic Microstructure ◽  
Ultra High Strength Steels

nnovative ultra high-strength steels have excellent mechanical properties which commonly relate to the materials martensitic microstructure. As thermal heat treatments are state-of-the-art for obtaining the desired microstructure, innovative thermo-mechanical treatments are likely to give rise to even better material qualities. This article highlights various aspects of innovative thermo-mechanical hardening strategies for the processing of ultra high-strength steels, involving both press hardening and friction spinning operations.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Sign in / Sign up

Export Citation Format

Share Document