Journal ArticleDOI
Impact of Reversed Austenite on the Impact Toughness of the High-Strength Steel of Low Carbon Medium Manganese
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TLDR
In this article, the relationship between the volume fraction of austenite and the Charpy impact toughness in a medium-Mn steel in terms of microstructural evolution with impact temperature was elucidated.Abstract:
We elucidate the relationship between the volume fraction of austenite and the Charpy impact toughness in a medium-Mn steel in terms of microstructural evolution with impact temperature. Different from retained austenite in the matrix after direct quenching, sub-micron lath-shaped morphology-reversed austenite in medium-Mn steel was produced by intercritical annealing. We found that reversed austenite steadily affected the fracture mode; only ductile fractures and dimples decreased with decreasing impact temperature. After the impact fracture test, the content of reversed austenite in the matrix increased slightly with a decreasing impact temperature due to the stability of the austenite grains caused by recrystallization of α′ martensite. Reversed austenite slightly decreased during the impact process with a decreasing impact temperature.read more
Citations
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New insights into the corrosion behaviour of medium manganese steel exposed to a NaCl solution spray
TL;DR: In this article, a medium manganese steel with an appropriate concentration of chromium and other anti-corrosion elements was studied with the aim of further characterizing the corrosion feature (via corrosion kinetics, XRD, SEM, EPMA and XPS) exposed to a NaCl solution spray.
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Effect of intercritical annealing temperature on multiphase microstructure evolution in ultra-low carbon medium manganese steel
TL;DR: In this article, the effect of intercritical annealing temperature (IAT) on the multiphase microstructure evolution of 0.02C-7Mn steel was investigated using scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), X-ray diffraction and transmission electron microscope (TEM), as well as Thermo-Calc and Dictra software simulations.
Journal ArticleDOI
Effect of Nb microalloying on microstructure evolution and mechanical properties in low carbon medium manganese steel
TL;DR: In this article, the effect of Nb microalloying on microstructure evolution and mechanical properties of 0.02C-7Mn steel was investigated, and the results showed that the micro-structure was fully quenched martensite after subjected to reheating and quenching (RQ) process.
Journal ArticleDOI
Different roles of reversed austenite, athermal martensite and tempered martensite on low-temperature toughness in ultra-low carbon medium Mn steel
Danqi Zhang,Gang Liu,Xinjun Sun +2 more
TL;DR: In this paper, the impact energy of 0.02C-7Mn steel strongly depended on the grain boundary (GB) wetting transition, and athermal α/α GBs were not wetted when the tempering temperature (TT) was blow Ac1, but Mn segregation embrittled the GBs resulting in the intergranular fracture mode.
Journal ArticleDOI
Elevation of Impact Toughness of Medium-Manganese Trip-Steel 0.2% C – 6% Mn – 3% Al Due to Evolution of Microstructure Under Heat Treatment
TL;DR: In this article, the possibility of raising the impact toughness of medium-manganese TRIP-steel Fe 0.2% C -6% Mn -3% Al by application of a novel heat treatment involving quenching from the intercritical temperature range and subsequent tempering is investigated.
References
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Journal ArticleDOI
Effects of Volume Fraction and Stability of Retained Austenite on Ductility of TRIP-aided Dual-phase Steels
TL;DR: In this article, the effects of silicon and manganese contents on volume fraction and stability of retained Austenite particles in TRIP-aided dual-phase steels were investigated.
Journal ArticleDOI
Ultrafine-grained microstructures and mechanical properties of alloy steels
TL;DR: In this article, a variety of alloy steels with grain sizes in the range 0.3 to 1.1 μ were obtained in manganese and nickel steels by annealing 1 to 400 hr at temperatures between 450° and 650°C (840° to 1200°F).
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Current opinion in medium manganese steel
Young Kook Lee,Jeongho Han +1 more
TL;DR: In this paper, a review summarises the important results of previous studies about the effects of both intercritical annealing conditions and alloying elements on the microstructure and tensile properties of medium Mn steels.
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The effects of the initial martensite microstructure on the microstructure and tensile properties of intercritically annealed Fe–9Mn–0.05C steel
TL;DR: In this article, the effects of the initial microstructure of martensite on the microstructural evolution during intercritical annealing and the tensile properties of annealed specimens were investigated for Fe-9Mn-0.05C (wt.%) steel.
Journal ArticleDOI
Enhanced ductility and toughness in an ultrahigh-strength Mn-Si-Cr-C steel: The great potential of ultrafine filmy retained austenite
TL;DR: In this article, the formation process of the bainitic microstructure as well as martensite and retained austenite was revealed by conducting dilatometry, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction and transmission electron microscope (TEM).