The Influence of Thermomechanical Controlled Processing on Bainite Formation in Low Carbon High Strength Steel

Thermomechanical controlled processing is a very important way to control the microstructure and mechanical properties in low carbon, high strength steel. This is especially true in the case of bainite formation, where the complexity of the austenite-bainite transformation makes the control of the processing important. In this study, a low carbon, high manganese steel containing niobium was investigated to better understand the roles of austenite conditioning and cooling rates on the bainitic phase transformation. Specimens were compared with and without deformation, and followed by seven different cooling rates ranging between 0.5°C/s and 40°C/s. The CCT curves showed that the transformation behaviors and temperatures are very different. The different bainitic microstructures which varied with austenite deformation and cooling rates will be discussed.

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The influence of austenitization temperature on microstructural developments, mechanical properties, fracture mode and wear mechanism of Hadfield high manganese steel

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2020.12.003 ◽

2021 ◽

Vol 10 ◽

pp. 819-831

Author(s):

H.R. Jafarian ◽

M. Sabzi ◽

S.H. Mousavi Anijdan ◽

A.R. Eivani ◽

N. Park

Keyword(s):

Mechanical Properties ◽

Fracture Mode ◽

Wear Mechanism ◽

Manganese Steel ◽

High Manganese ◽

High Manganese Steel ◽

Austenitization Temperature

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A Study on Fiber Laser Welding of High-Manganese Steel for Cryogenic Tanks

Processes ◽

10.3390/pr8121536 ◽

2020 ◽

Vol 8 (12) ◽

pp. 1536

Author(s):

Jaewoong Kim ◽

Jisun Kim ◽

Changmin Pyo

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Yield Strength ◽

Laser Welding ◽

Base Material ◽

Manganese Steel ◽

High Manganese ◽

Fiber Laser Welding ◽

High Manganese Steel ◽

Welding Part

As the environmental regulations on ship emissions by the International Maritime Organization (IMO) become stricter, the demand for a ship powered by liquefied natural gas (LNG) is rapidly increasing worldwide. Compared to other materials, high-manganese steel has the advantages of superior impact toughness at cryogenic temperatures, a low thermal expansion coefficient, and a low-cost base material and welding rod. However, there is a limitation that the mechanical properties of a filler material are worse than those of a base material that has excellent mechanical properties. To solve these shortcomings, a basic study was performed to apply fiber laser welding with little welding deformation and no filler material to high-manganese steel. The relationship between laser welding parameters and penetration shapes was confirmed through cross-section observation and analysis by performing a bead on plate (BOP) test by changing laser power and welding speed, which are the main parameters of laser welding. In addition, the welding performance was evaluated through mechanical property tests (yield strength, tensile strength, hardness, cryogenic impact strength) of a welding part after performing the high-manganese steel laser butt welding experiment. As a result, it was confirmed that the yield strength of a high-manganese steel laser welding part was 97.5% of that of a base metal, and its tensile strength was 93.5% of that of a base metal.

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Anisotropic mechanical properties and deformation behavior of low-carbon high-strength steel component fabricated by wire and arc additive manufacturing

Materials Science and Engineering A ◽

10.1016/j.msea.2020.139514 ◽

2020 ◽

Vol 787 ◽

pp. 139514

Author(s):

Laibo Sun ◽

Fengchun Jiang ◽

Ruisheng Huang ◽

Ding Yuan ◽

Chunhuan Guo ◽

...

Keyword(s):

Mechanical Properties ◽

Additive Manufacturing ◽

High Strength Steel ◽

Deformation Behavior ◽

High Strength ◽

Low Carbon ◽

Steel Component ◽

Anisotropic Mechanical Properties

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Investigations on metallurgical and mechanical properties of resistant spot welded dissimilar joints between a high manganese steel and a low alloyed steel grade

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/882/1/012008 ◽

2020 ◽

Vol 882 ◽

pp. 012008

Author(s):

C Frohwein ◽

M Otto ◽

M Ecke ◽

S Jüttner ◽

T Halle

Keyword(s):

Mechanical Properties ◽

Steel Grade ◽

Alloyed Steel ◽

Manganese Steel ◽

High Manganese ◽

High Manganese Steel ◽

Dissimilar Joints ◽

Low Alloyed Steel ◽

Spot Welded

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Mechanical Properties of High-Manganese Austenitic TWIP-Type Steel

Materials Science Forum ◽

10.4028/www.scientific.net/msf.783-786.27 ◽

2014 ◽

Vol 783-786 ◽

pp. 27-32 ◽

Cited By ~ 3

Author(s):

Leszek Adam Dobrzański ◽

Wojciech Borek ◽

Janusz Mazurkiewicz

Keyword(s):

Mechanical Properties ◽

Plastic Deformation ◽

High Strength ◽

Deformation Energy ◽

Mechanical Twinning ◽

Austenitic Steels ◽

Manganese Steel ◽

Cold Plastic Deformation ◽

High Plasticity ◽

High Manganese

Taking into consideration increased quantity of accessories used in modern cars, decreasing car’s weight can be achieved solely by optimization of sections of sheets used for bearing and reinforcing elements as well as for body panelling parts of a car. Application of sheets with lower thickness requires using sheets with higher mechanical properties, however keeping adequate formability. The goal of structural elements such as frontal frame side members, bumpers and the others is to take over the energy of an impact. Therefore, steels that are used for these parts should be characterized by high value of UTS and UEl, proving the ability of energy absorption. Among the wide variety of recently developed steels, high-manganese austenitic steels with low stacking faulty energy are particularly promising, especially when mechanical twinning occurs. Beneficial combination of high strength and ductile properties of these steels depends on structural processes taking place during cold plastic deformation, which are a derivative of SFE of austenite, dependent, in turn on the chemical composition of steel and deformation temperature. High-manganese austenitic steels in effect of application of proper heat treatment or thermo-mechanical treatment can be characterized by different structure assuring the advantageous connection of strength and plasticity properties. Proper determinant of these properties can be plastic deformation energy supply determined by integral over surface of cold plastic deformation curve. Obtaining of high strength properties with retaining the high plasticity has significant influence for the development of high-manganese steel groups and their significance for the development of materials engineering.

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