Effect of ausforming and cooling condition on the orientation relationship in martensite and bainite of low carbon steels

Zolotorevsky, Nikolay Y.; Panpurin, S. N.; Zisman, A. A.; Петров, С. Н.

doi:10.1016/j.matchar.2015.07.023

Cited by 25 publications

(13 citation statements)

References 29 publications

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“…Furthermore, the ratio of martensite to bainite (M/B) increased with higher cooling rates. These were consistent with the processes controlling phase transformations Zolotorevsky et al, 2015).…”

Section: Ebsd Quantitative Analysissupporting

confidence: 87%

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Wang

Hua

Kong

et al. 2016

Microsc. Res. Tech.

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In the present work, ultra-high-strength steels with multiphase microstructures containing martensite and bainite were prepared by controlling the cooling rate. A new approach was proposed for quantitatively statistical phase analysis using electron backscatter diffraction (EBSD) based on the band contrast which correlates to the quality and intensity of the diffraction patterns. This approach takes advantage of the inherently greater lattice imperfections of martensite, such as dislocations and low-angle grain boundaries, relative to that of bainite. These can reduce the intensity and quality of the EBSD patterns of martensite, which decrease the band contrast. Thus, combined with morphological observations, Gaussian two-peak fitting was employed to analyze the band contrast profile and confirm the ranges of band contrast for the two phases. The volume fractions of bainite and martensite in different samples were determined successfully. In addition, the results show that increased cooling rates improve the proportion of martensite and the ratio of martensite to bainite. Microsc. Res. Tech. 79:814-819, 2016. © 2016 Wiley Periodicals, Inc.

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Section: Ebsd Quantitative Analysissupporting

confidence: 87%

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Wang

Hua

Kong

et al. 2016

Microsc. Res. Tech.

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Section: Short Commentarymentioning

confidence: 95%

“…The effect mechanism of the rolling process parameters on the microstructure evolution and mechanical properties of bearing rings is also established [14,15]. Thirdly, some studies reported how the heat treatment process effects the microstructure evolution and mechanical properties of bearing rings [16,17].The above research results could hardly provide the optimal rolling technical route to realize the cooperative control of the geometric accuracy and microstructure performance of bearing rings. Further experimental and theoretical studies and numerical calculation may be needed for establishing the quantitative correlation mechanism of rolling technical route with geometric formation, fine crystalline microstructure and high toughness of bearing rings.…”

mentioning

confidence: 99%

Grain Refinement-Plastic Deformation -Texture of Bearing Ring Blank in Cold Ring Rolling

Deng¹,

Mao²,

Shi³

2017

Adv Automob Eng

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Ring rolling is a process for creating seamless ring-shaped components using specialized equipment and forming process because of its technological superiorities of high quality, high efficiency and low consuming in energies and materials [1]. According to the international trend of cooperative control of the geometric accuracy and microstructure performance in ring rolling, rolling forming criteria such as biting-in condition, plastic penetrating condition, and plastic deformation were considered comprehensively to manufacture the bearing rings [2,3]. The evolution rules of grain refinement, plastic damage, and texture of bearing ring in ring rolling compatible with the rolling forming criteria are required for the cooperative control of the geometric accuracy and microstructure performance [4,5].To realize the cooperative control of the geometric accuracy and microstructure performance of the bearing ring, several rules of the bearing ring formation need to be revealed. Firstly, the constitutive equation of the material used for the bearing ring manufacture is crucial to study the deformation and microstructure evolution of bearings. At present, the high temperature flow stress strain relation, austenite grain growth behaviour, volume fraction and grain size of the recrystallization are still the most important research points for the constitutive equation of the material.The mechanical conditions of rolling forming and the rules of geometric formation of bearing rings are also important and widely studied such as ring rolling theory [6,7], rolling forming process [8], process tooling [9], and forming equipment [10]. Moreover, many studies revealed the evolution rules of grain refinement, content and stability of retained austenite, and micro texture of bearing rings in ring rolling [11][12][13]. The effect mechanism of the rolling process parameters on the microstructure evolution and mechanical properties of bearing rings is also established [14,15]. Thirdly, some studies reported how the heat treatment process effects the microstructure evolution and mechanical properties of bearing rings [16,17].The above research results could hardly provide the optimal rolling technical route to realize the cooperative control of the geometric accuracy and microstructure performance of bearing rings. Further experimental and theoretical studies and numerical calculation may be needed for establishing the quantitative correlation mechanism of rolling technical route with geometric formation, fine crystalline microstructure and high toughness of bearing rings.Further, it is important to form the cooperative control mechanism of ring rolling process and heat treatment process to obtain the fine crystalline microstructure and high toughness of bearing rings. Future studies should be carried on along the above ideas to solve the optimal ring rolling-heat treatment route realizing the cooperative control of the geometric accuracy and microstructure performance of bearing rings.

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“…The results of the reconstruction are highly sensitive to the selection of an appropriate OR [7]. It has been proven that the average OR of steels is influenced by their chemical composition and cooling condition during phase transformation [12]. Consequently, the OR should be first determined for the material.…”

Section: Precise Solution Of the Ormentioning

confidence: 99%

An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

Wang

Jin

et al. 2019

Crystals

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The microstructure of austenite at high temperatures, which cannot be reserved at room temperatures, determines the properties of its transformed phase in low-alloy steels. Consequently, an accurate method is herein developed to reconstruct local orientations of the parent austenite (γ) phase from electron backscatter diffraction maps of the martensite (α ) microstructure. The orientation map of α is cropped into a grid of data squares as the reconstruction unit. The cropped square is then divided into the square inherited from only one γ grain and the square inherited from more than one γ grain. The local orientations around parent γ grain boundaries are more accurately determined using a newly proposed reconstruction criterion. Furthermore, the solution spaces for the orientation relationship and the parent γ orientation are refined, which simultaneously improves the calculation accuracy and efficiency of reconstruction procedure. The validated reconstruction method is applied to obtain local orientations of the deformed γ microstructure accurately.

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Effect of ausforming and cooling condition on the orientation relationship in martensite and bainite of low carbon steels

Cited by 25 publications

References 29 publications

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Quantitative analysis of martensite and bainite microstructures using electron backscatter diffraction

Grain Refinement-Plastic Deformation -Texture of Bearing Ring Blank in Cold Ring Rolling

An Accurate Method for Crystallographic Reconstruction of Parent Austenite from Inherited Martensite in a Low-Alloy Steel

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