Microplasticity behavior of multiphase high-strength nanobainitic steel based on a modified law of mixtures

Yang, Zhinan; Liu, C.B.; Zhang, C.Y.; Fang, Q.W.; Li, Y.G.; El-Fallah, G. M. A. M.; Ooi, S. W.; Zhang, F.C.

doi:10.1016/j.msea.2021.141848

Cited by 14 publications

(5 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the above calculations, the trend of theoretical strength agrees with the experimental trend under different cold rolling reductions. However, the strength values experimentally determined were higher than the theoretical values since the strengthening of the small amount of martensite (transformed from filmy retained austenite) were not considered in the calculations [36]. Thus, the strength increment can be mainly attributed to the two strengthening mechanisms.…”

Section: Strength Analysismentioning

confidence: 79%

“…In general, grain refinement can simultaneously improve the strength and elongation of steels, suggesting that microstructure refinement may also play a similar role [24,30,34,35]. During the rolling process, the amount of MA decreased with increasing rolling reduction ratio, which may be attributed to the partial transformation of austenite into martensite under the action of stress [36,37]. The width of the laths decreases with the cold rolling reduction ratio increasing (Figure 4).…”

Section: Effect Of Microstructure Evolution On Mechanical Propertiesmentioning

confidence: 95%

See 1 more Smart Citation

The Role of Cold Rolling Reduction on the Microstructure and Mechanical Properties of Ultra-Low Carbon Bainitic Steel

Wang

et al. 2022

Materials

View full text Add to dashboard Cite

The present study investigates the microstructure and mechanical properties of ultra-low carbon bainitic steel (UCBS) under different cold rolling reductions. When the rolling reduction ratios were increased to 80%, the microstructure was refined, and the lath width of the bainite decreased from 601 nm to 252 nm. The ultimate tensile strength and yield strength increased from 812 MPa and 683 MPa to 1195 MPa and 1150 MPa, respectively, whereas the elongation decreased from 15.9% to 7.9%. In addition, the dislocation density increased from 8.3 × 1013 m−2 to 4.87 × 1014 m−2 and a stronger γ-fiber texture was obtained at the 80% cold rolling reduction ratio. The local stress distribution and kernel average misorientation were not uniform and became more severe with increased rolling reduction ratios. The strength increment of UCBS was primarily due to boundary strengthening and dislocation strengthening. The theoretical strength increment agreed well with the experimental measurements, which can be helpful for the design and production of UCBS for broad engineering applications.

show abstract

Section: Strength Analysismentioning

confidence: 79%

Section: Effect Of Microstructure Evolution On Mechanical Propertiesmentioning

confidence: 95%

The Role of Cold Rolling Reduction on the Microstructure and Mechanical Properties of Ultra-Low Carbon Bainitic Steel

Wang

et al. 2022

Materials

View full text Add to dashboard Cite

show abstract

“…The austenite lattice parameter a γ was obtained by the Nelson-Riley extrapolation method, [66] and the carbon concentration of RA can be estimated by Equation (8) according to the relationship between α γ and x C : [67] α γ ¼ 3.556 þ 0.0453x C þ 0.00095x Mn (8) where a γ is the austenite lattice parameter (Å), x C and x Mn are the concentrations of carbon and manganese in austenite (wt%), respectively. Since Si alloying has a negligible effect on austenite lattice parameter in austenitic steel, [68,69] Si was not considered for the calculation.…”

Section: Methodsmentioning

confidence: 99%

“…[5] The stability of RA is determined by its carbon content, grain size, morphology, and the constraining effect of the surrounding phases. [6][7][8][9][10][11][12] During the isothermal bainitic transformation process, carbon atoms diffuse from the bainitic ferrite (BF) into the surrounding untransformed austenite. In general, two types of enriched austenite morphologies are observed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Microstructure and Mechanical Properties of a High‐Carbon Bainitic Steel Treated by Long‐Time Bainitic Austempering and Short‐Time Austempering Plus Tempering Processes

Wang,

Gao,

Gui

et al. 2024

steel research int.

View full text Add to dashboard Cite

Herein, the microstructure and mechanical properties of a high‐carbon bainitic steel treated by long‐time bainitic austempering and short‐time austempering plus tempering processes are compared. The multiphase microstructures are characterized by dilatometry, X‐ray diffraction, scanning electron microscopy, and transmission electron microscopy to correlate with mechanical properties. Results show that although long‐time austempering treatment can reduce the volume fraction of brittle martensite, no significant improvement is observed in fracture damage resistance. Besides, the cementite is prone to precipitation from the austenite at the later period of the long‐time austempering process. The cementite precipitation in austenite decreases the carbon content in retained austenite (RA) and consequently reduces the mechanical stability of RA. In contrast, the cementite has not been able to precipitate from austenite after short‐time austempering treatment, whereas the martensite is softened and the stability of RA is improved during subsequent tempering. Therefore, excellent mechanical properties are obtained in the samples treated by short‐time austempering plus tempering process: ultimate tensile strength, 1489 MPa, yield strength, 1014 MPa, total elongation, 33.2%, and the product of strength and elongation (PSE) of 48.4 GPa%, where PSE is increased by 27% compared with the sample after long‐time bainitic austempering.

show abstract

Microstructure analysis and quantitative strengthening evaluation of medium carbon bainitic multiphase steel

Sun

Wang

et al. 2022

J Mater Sci

View full text Add to dashboard Cite

Microplasticity behavior of multiphase high-strength nanobainitic steel based on a modified law of mixtures

Cited by 14 publications

References 57 publications

The Role of Cold Rolling Reduction on the Microstructure and Mechanical Properties of Ultra-Low Carbon Bainitic Steel

The Role of Cold Rolling Reduction on the Microstructure and Mechanical Properties of Ultra-Low Carbon Bainitic Steel

Comparison of Microstructure and Mechanical Properties of a High‐Carbon Bainitic Steel Treated by Long‐Time Bainitic Austempering and Short‐Time Austempering Plus Tempering Processes

Microstructure analysis and quantitative strengthening evaluation of medium carbon bainitic multiphase steel

Contact Info

Product

Resources

About