Benefits of Intercritical Annealing in Quenching and Partitioning Steel

Wang, X.; Liu, L.; Liu, R. D.; Huang, Mingxin

doi:10.1007/s11661-018-4559-6

Cited by 28 publications

(8 citation statements)

References 12 publications

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“…To elucidate the effect of microstructural constituents associated with its morphological characteristics on low cycle fatigue (LCF) behaviour of 20MnMoNi55 steel, a series of inter-critical heat treatment procedures 7 were established to introduce fractional variation of martensitic islands in a ferrite matrix. The major constituent phases of 20MnMoNi55 steel are basically bainite and a little amount of retained austenite in the ferrite matrix.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Basu

Acharyya

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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The effect of varying microstructural parameters on the cyclic behaviour of dual-phase steels was studied on the basis of experimental and micromechanical finite-element simulated results. The initial bainitic morphology of as-received 20MnMoNi55 steel was transformed into ferrite and martensite through proper inter-critical heat treatment procedures. Strain-controlled low cycle fatigue tests were conducted at room temperature with different strain amplitudes at a specific strain rate of 10−3/s. The cyclic stress–strain curve, obtained through joining the peak stresses of hysteresis loops corresponding to different strain amplitude, shows an increase in strain hardening with an increase in volume fraction of martensite. Whereas the rate of cyclic softening, considering the decrease in stress amplitude with respect to elapsed cycles, increases with increasing strain amplitude. Inclusive of all affecting microstructural parameters, an original microstructure-based representative volume element associated with a crystal plasticity-based material model was adopted for conducting micromechanical finite-element simulation. In addition to several parameters associated with a crystal plasticity model, consideration of initial geometrically necessary dislocation density in constituent phases resulted in the accurate prediction of a hysteresis loop at low strain amplitude as compared with the experimental results. A variation of stress triaxiality built up in ferrite matrix with martensite fraction along with deformation inhomogeneity between ferrite and martensite was also observed through a strain partitioning phenomenon obtained from finite-element simulated results.

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Section: Introductionmentioning

confidence: 99%

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Basu

Acharyya

Sahoo

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Proposed by Speer et al [5], the Q&P steel has a high elongation and an excellent strength-ductility balance. In particular, the intercritical annealed Q&P steel, which obtains better comprehensive properties, has realized industrial production [6].…”

Section: Introductionmentioning

confidence: 99%

Quasi-Situ Characterization of Deformation in Low-Carbon Steel with Equiaxed and Lamellar Microstructure Treated by the Quenching and Partitioning Process

Gao

Chen

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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The relationship between microstructure morphology and mechanical properties of the low-carbon steel (Fe-0.20C-2.59Mn-2.13Si) treated by different intercritical annealed quenching and partitioning (Q&P) processes was investigated through interrupted tensile tests plus quasi-situ electron backscatter diffraction measurements. Results show that size and distribution of retained austenite (RA) directly affect the sequence of deformation induced martensitic transformation. As strain increases, the equiaxed RA grains wrapped by ferrite transform first, followed by the equiaxed and film-like RA grains adjacent to martensite. Compared with traditional intercritical annealed Q&P steel with equiaxed structure, the steel with quenching pretreatment contains uniform lamellar structure and the relatively film-like type of RA, leading to the higher yield strength, tensile strength, and elongation, as well as the steady increase in dislocation density upon straining.

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“…The soft ferrite matrix of the medium Mn steel produced by the IA process is responsible for the low yield strength, while the steel after IA-Q&P process can possess extra martensite, which can increase the yield strength (Cho et al, 2016;De Cooman et al, 2016). Although the medium Mn steel produced by the IA-Q&P process exhibits better ductility than that fabricated by the single Q&P process owing to the optimal mechanical stability of retained austenite, the former has lower yield strength due to the existence of ferrite phase (Wang X. et al, 2018). The mechanical properties of the IA-Q&P steel can be tuned by changing the IA temperature, quenching temperature, and annealing duration.…”

Section: Introductionmentioning

confidence: 99%

On the Variants of Thermal Process in Developing Strong and Ductile Medium Mn Steel

Pan

2020

Front. Mater.

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In this contribution, we investigate the influence of three heat treatments, including intercritical annealing (IA), quenching and partitioning (Q&P), and combination of IA and Q&P (IA-Q&P), on microstructure and mechanical properties of the medium Mn steel. The steel treated by the IA process has the largest volume fraction of austenite, which is responsible for the longest elongation and largest energy absorption with the operation of both transformation-induced plasticity (TRIP) effect and twinning-induced plasticity (TWIP) effects. The medium Mn steel produced by IA-Q&P treatment has a mixture microstructure with retained austenite, ferrite, and lath martensite. The existence of martensite in the IA-Q&P steel makes the higher yield strength than that of the IA steel. The better uniform elongation of the IA-Q&P steel than that of the Q&P steel is ascribed to the larger volume fraction of retained austenite and higher mechanical stability of austenite. The Q&P steel has the highest yield stress due to its martensite matrix. It is expected that the tensile properties of medium Mn steel can be tuned by different thermal processes (IA, Q&P, and IA-Q&P) to facilitate its broad automotive applications.

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Benefits of Intercritical Annealing in Quenching and Partitioning Steel

Cited by 28 publications

References 12 publications

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Effect of microstructural constituents and morphological characteristics on low cycle fatigue behaviour of inter-critically annealed 20MnMoNi55 steel

Quasi-Situ Characterization of Deformation in Low-Carbon Steel with Equiaxed and Lamellar Microstructure Treated by the Quenching and Partitioning Process

On the Variants of Thermal Process in Developing Strong and Ductile Medium Mn Steel

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