Enhanced thermal fatigue resistance of 20Mn2SiCrMo bainitic steel by microstructure stabilization design

Tian, Yu; Tan, Zhunli; Li, Xianjun; Liu, Yanru; Wang, Rui; Lv, Bo; Zhang, Min

doi:10.1016/j.ijfatigue.2022.106885

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…The austenite lattice parameter

a_{\gamma}

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

\left(\alpha\right)_{\gamma}

and x C : [ 67 ]

\left(\alpha\right)_{\gamma} = 3.556 &amp;#x00026;amp;amp;amp;amp;amp;amp;plus; 0.0453 x_{\text{C}} &amp;#x00026;amp;amp;amp;amp;amp;amp;plus; 0.00095 x_{\text{Mn}}

where

a_{\gamma}

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%

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.

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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.

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“…The austenite lattice parameter

a_{\gamma}

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

\left(\alpha\right)_{\gamma}

and x C : [ 67 ]

\left(\alpha\right)_{\gamma} = 3.556 &amp;#x00026;amp;amp;amp;amp;amp;amp;plus; 0.0453 x_{\text{C}} &amp;#x00026;amp;amp;amp;amp;amp;amp;plus; 0.00095 x_{\text{Mn}}

where

a_{\gamma}

Section: Methodsmentioning

confidence: 99%

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

show abstract

Section: Introductionmentioning

confidence: 99%

“…Thus, it is necessary to study the effects of key factors such as heat treatments, microstructure evolution, and thermal stabilities of the steel for related steel properties on thermal fatigue properties. [11] At present, the research on improving thermal fatigue performance and service life mainly focus on optimizing alloy elements and surface treatments including surface coating, vapor deposition, and laser surface strengthening that seek to prolong die service life. It is found [12][13][14] that the segregation of elements on grain boundaries can be reduced to a certain extent as well as the strength of grain boundaries can be increased by adjusting DOI: 10.1002/srin.202200834…”

Section: Introductionmentioning

confidence: 99%

A Novel Heat Treatment Strategy Based on Quenching and Carbides Preprecipitation and Subsequent Critical Quenching to Improve the Thermal Fatigue Performance of AISI H13 Tool Steel

Zhang

Tang

Yue

et al. 2023

steel research int.

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The effects of conventional quenching and based on quenching and carbides preprecipitation and subsequent critical quenching (QPQ) processes on the microstructure evolution, thermal stability and thermal fatigue are studied for H13 tool steel. The results show that the QPQ treatment is beneficial to precipitate smaller and more uniformly distributed carbides during the tempering. According to the analysis of microstructure and mechanical properties, it is found that the tempering after QPQ treatment can refine the grain size of the steel by about 60% and can increase the impact toughness by 34.8%. Moreover, it is also found that the activation energy required by the QPQ treatment is higher than that of the conventional quenched samples for long‐time tempering, which is mainly related to the coarsening and accumulation of carbides. According to the statistical analysis results of average thermal fatigue crack length, crack density, and surface hardness, the improvement of thermal fatigue performance of the QPQ treatment after tempering is mainly attributed to the uniform fine carbide and grain refinement, which passivates the crack tip and improves the service life to a certain extent.

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Microstructure stability in wheel steel: A case of thermal-accumulated damage capacity in pearlite and low-carbon bainite

Tian,

Tan,

Zhang

et al. 2023

Engineering Failure Analysis

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Enhanced thermal fatigue resistance of 20Mn2SiCrMo bainitic steel by microstructure stabilization design

Cited by 7 publications

References 27 publications

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

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

A Novel Heat Treatment Strategy Based on Quenching and Carbides Preprecipitation and Subsequent Critical Quenching to Improve the Thermal Fatigue Performance of AISI H13 Tool Steel

Microstructure stability in wheel steel: A case of thermal-accumulated damage capacity in pearlite and low-carbon bainite

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