Heterogeneous nano/ultrafine-grained medium Mn austenitic stainless steel with high strength and ductility

Niu, Gang; Wu, Huibin; Zhang, Da; Gong, Na; Tang, Di

doi:10.1016/j.msea.2018.04.022

Cited by 39 publications

(16 citation statements)

References 47 publications

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“…Medium-Mn steels (~3–11 wt.% Mn) are a new category of advanced high strength steels (AHSS) that have attracted research interest worldwide in recent years [1,2,3,4,5]. These steels have fine microstructures and contain a large fraction of metastable retained austenite, thus exhibiting excellent strength and elongation.…”

Section: Introductionmentioning

confidence: 99%

“…This allows the material to meet the processing requirement for automobile parts with complex structures [5,6,7,8]. Therefore, the amount of retained austenitein medium-Mn steels determine show extensive is the TRIP effect; that is, the transformation of retained austenite into martensite during deformation increases the strength and ductility of steel simultaneously [1,2,3,4,5,6,7,8]. Our previous workon cold-rolled medium-Mn steel revealed that the steel should contain a high fraction of retained austenite, with appropriate stability [9].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

et al. 2018

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This study investigated the microstructure and mechanical properties of hot-rolled and cold-rolled medium-Mn transformation-induced plasticity (TRIP) steel. The experimental steel, processed by quenching and tempering (Q & T) heat treatment, exhibited excellent mechanical properties for hot-rolled and Q & T steels (strength of 1050–1130 MPa and ductility of 16–34%), as well as for cold-rolled and Q & T steels (strength of 878–1373 MPa and ductility of 18–40%). The mechanical properties obtained after isothermal holding at 775 °C for one hour for cold-rolled/Q & T steel were superior to that of hot-rolled/Q & T steel. Excellent mechanical properties were attributed to the large amount of retained austenite, which produced a discontinuous TRIP effect. Additionally, the differences in mechanical properties correlated with the morphology, stability and content of retained austenite. The cold-rolled sample, quenched from 650 °C (CR 650°C) had extensive TRIP effects in the middle and late stages of the deformation, leading to better mechanical properties. The fracture modes of the hot-rolled sample, quenched from 650 °C, and the cold-rolled sample quenched from 650 °C, were ductile fractures, resulting in excellent ductility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

et al. 2018

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“…However, the strength of austenitic stainless steel is relatively low due to its intrinsic face-centered cubic structure, which limits its further application. Thus, increasing the strength of austenitic stainless steel is always the research hotspot to meet the increasing demand of the environment [2][3][4][5]. Many previous investigations [6][7][8] have proved that grain refinement is the most efficient method to improve simultaneously the mechanical properties and corrosion properties of austenitic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Maintaining microstructure ultra-refinement in the austenitic stainless steel by inducing χ phase precipitating through severe cold rolling and annealing

Guan

Guo

et al. 2022

Mater. Res. Express

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In the present study, an austenitic stainless steel (2Cr17Ni13Mo5) was processed by severe cold rolling (SCR) and subsequent annealing. The austenitic grain size was severely refined to ~100 nm after SCR due to the high strain deformation. The yield strength (YS) and ultimate tensile strength (UTS) of SCRed steel increased to 1510.5 MPa and 1660.4 MPa, respectively. Nevertheless, the ductility decreased significantly showing very low strain hardening ability. Full recrystallization was completed after annealing at 800 oC for 1h. However, the ultrafine-grained structure was maintained with the grain size of 780 nm, which is mainly attributed to the pinning effect of χ-phase precipitated at the grain boundary during the annealing. Consequently, good comprehensive mechanical properties with high strength (YS=977.6 MPa, UTS=1197.7 MPa) and good ductility (elongation=17%) were achieved after annealing. The high strength is mainly attributed to the ultrafine-grained structure maintaining, while the annihilation of dislocation contributes to the ductility improvement.

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“…Grain refining is considered to be one of the most effective and important methods to improve low temperature toughness of steels with high strength simultaneously [1][2][3][4][5]. Meanwhile, it is also nodamage to weldability of steels since there is no increase in carbon equivalent.…”

Section: Introductionmentioning

confidence: 99%

The important role of titanium microalloying in refining austenite grain of heavy‐duty H‐beam steel during rough rolling produced by a new technology

Wang

et al. 2021

Materialwissenschaft Werkst

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A new technology of austenite grain refinement, fine austenite enhanced ferrite transformation, is proposed for heavy‐duty hot‐rolled H‐beam steels in this work. Titanium microalloying is very important and necessary for the new technology. The effect of titanium on the prior austenite grain size of steels during simulated rough rolling was investigated. The results show that the prior austenite grain sizes of specimens with titanium and niobium elements are much finer than those of specimens with niobium but without titanium deformed at the same parameters. For the alloying composition of studied steels, titanium nitride particle maybe precipitated in specimens with titanium at above 1,200 °C, however, niobium carbide particles can't form in specimens without titanium at above 1,150 °C. The thermodynamically stable titanium nitride particles can impede the grain growth at high temperature for example furnace heating before rough rolling and bring the epitaxial growth of niobium carbide on pre‐existing themselves which induces a large number of titanium nitride‐niobium carbide composite precipitates. These fine precipitates can pin austenite grain boundaries effectively and ensure austenite grain refinement.

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Heterogeneous nano/ultrafine-grained medium Mn austenitic stainless steel with high strength and ductility

Cited by 39 publications

References 47 publications

Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

Microstructure and Mechanical Properties of Hot- Rolled and Cold-Rolled Medium-Mn TRIP Steels

Maintaining microstructure ultra-refinement in the austenitic stainless steel by inducing χ phase precipitating through severe cold rolling and annealing

The important role of titanium microalloying in refining austenite grain of heavy‐duty H‐beam steel during rough rolling produced by a new technology

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