High strength-toughness combination of a low-carbon medium-manganese steel plate with laminated microstructure and retained austenite

A ultra low carbon high strength steel heavy plate (60∼80mm thick) was produced with TMCP at Xiangtan Steel. The steel has a good combination of high strength (σb∼600MPa) and impact toughness (∼300J). The microstructural features were analyzed by optical microscopy and scanning electron microscopy (SEM). Results showed that microstructures consisted of a large amount of acicular ferrite and a small amount of polygonal ferrite. A very few amount of retained austenite was also observed in the microstructures. The formation of fine acicular ferrite resulted in the high strength of the steel plate. The good impact toughness of the steel plate is mainly attributed to the formation of acicular ferrite and a very few amount of retained austenite.

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Microstructure and Mechanical Properties of Medium Manganese Steel Plate with High Strength and Toughness

Materials Science Forum ◽

10.4028/www.scientific.net/msf.879.2293 ◽

2016 ◽

Vol 879 ◽

pp. 2293-2299

Author(s):

Ying Zou ◽

Yun Bo Xu ◽

Zhi Ping Hu ◽

Xiao Long Yang ◽

Xiao Dong Tan ◽

...

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Retained Austenite ◽

Annealing Temperature ◽

Steel Plate ◽

Volume Fraction ◽

Manganese Steel ◽

Uniaxial Tensile ◽

Medium Manganese Steel ◽

Strength And Toughness

An intercritical annealing process was applied to a medium manganese steel plate (Fe-0.01C-5.3Mn-1.53Si) after the thermo-mechanical controlled processing (TMCP) and ultrafast cooling (UFC). The microstructures were observed by scanning electron microscopy (SEM) equipped with electron backscatter diffraction (EBSD), electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM). The retained austenite was measured by XRD and mechanical properties were measured by uniaxial tensile and impact tests. The influence of different annealing temperature was compared and the relationship between microstructures and mechanical properties was investigated. Results showed that the microstructures of the medium manganese steel plate were characterized by ultrafine grained lath-like ferrite and retained austenite and the excellent mechanical properties could be obtained at the annealing temperature of 640°C for 5 h. The volume fraction of the retained austenite reached up to 21%, which could significantly increase the elongation compared with the traditional steel plate. The mechanical property results revealed that the steel possessed adequate ultimate tensile strength of 865MPa and excellent impact energy of 121J (-20°C). The outstanding combination of strength and toughness indicates that the steel has a bright application prospect.

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Hydrogen embrittlement behavior of high strength low carbon medium manganese steel under different heat treatments

International Journal of Hydrogen Energy ◽

10.1016/j.ijhydene.2019.10.103 ◽

2019 ◽

Vol 44 (60) ◽

pp. 32292-32306 ◽

Cited By ~ 9

Author(s):

Yu Du ◽

Xiuhua Gao ◽

Liangyun Lan ◽

Xiangyu Qi ◽

Hongyan Wu ◽

...

Keyword(s):

Hydrogen Embrittlement ◽

High Strength ◽

Heat Treatments ◽

Manganese Steel ◽

Low Carbon ◽

Medium Manganese Steel

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Adjustment of Mechanical Properties of Medium Manganese Steel Produced by Laser Powder Bed Fusion with a Subsequent Heat Treatment

Materials ◽

10.3390/ma14113081 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3081

Author(s):

Lena Heemann ◽

Farhad Mostaghimi ◽

Bernd Schob ◽

Frank Schubert ◽

Lothar Kroll ◽

...

Keyword(s):

Mechanical Properties ◽

Retained Austenite ◽

Intercritical Annealing ◽

High Strength ◽

Manganese Steel ◽

Manganese Concentration ◽

Powder Bed Fusion ◽

Laser Powder Bed Fusion ◽

Powder Bed ◽

Medium Manganese Steel

Medium manganese steels can exhibit both high strength and ductility due to transformation-induced plasticity (TRIP), caused by metastable retained austenite, which in turn can be adjusted by intercritical annealing. This study addresses the laser additive processability and mechanical properties of the third-generation advanced high strength steels (AHSS) on the basis of medium manganese steel using Laser Powder Bed Fusion (LPBF). For the investigations, an alloy with a manganese concentration of 5 wt.% was gas atomized and processed by LPBF. Intercritical annealing was subsequently performed at different temperatures (630 and 770 °C) and three annealing times (3, 10 and 60 min) to adjust the stability of the retained austenite. Higher annealing temperatures lead to lower yield strength but an increase in tensile strength due to a stronger work-hardening. The maximum elongation at fracture was approximately in the middle of the examined temperature field. The microstructure and properties of the alloy were further investigated by scanning electron microscopy (SEM), hardness measurements, X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and element mapping.

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ASTM A710

Alloy Digest ◽

10.31399/asm.ad.sa0446 ◽

1990 ◽

Vol 39 (4) ◽

Keyword(s):

Fracture Toughness ◽

Tensile Properties ◽

Precipitation Hardening ◽

Steel Plate ◽

High Strength ◽

Heat Treating ◽

Low Carbon ◽

Bethlehem Steel Corporation ◽

Strength Alloy ◽

Carbon Precipitation

Abstract ASTM A710 is a low-carbon, precipitation hardening high-strength alloy steel plate. It is well suited to critical applications. This datasheet provides information on composition and tensile properties as well as fracture toughness. It also includes information on heat treating and joining. Filing Code: SA-446. Producer or source: Bethlehem Steel Corporation.

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BETHSTAR 60

Alloy Digest ◽

10.31399/asm.ad.sa0421 ◽

1986 ◽

Vol 35 (8) ◽

Keyword(s):

Fracture Toughness ◽

Yield Strength ◽

Steel Plate ◽

High Stress ◽

High Strength ◽

Heat Treating ◽

Low Carbon ◽

Bethlehem Steel Corporation ◽

Low Sulfur ◽

Minimum Yield

Abstract BethStar 60 steel plate is a high-strength product with a 60,000 psi minimum yield strength. It contains low carbon and low sulfur and has outstanding toughness, weldability and formability. It provides the design engineer with a an economical high-strength low-alloy (HSLA) grade that can be fabricated readily. Applications include weight-sensitive components subject to high stress such as frames for large off-highway haulers. This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-421. Producer or source: Bethlehem Steel Corporation.

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