Enhancing the Mechanical Properties of a Hot Rolled High-Strength Steel Produced by Ultra-Fast Cooling and Q&amp;P Process

Wu, Teng; Wu, Run; Liu, Bin; Liang, Wen; Duan, Ke

doi:10.3390/met9090958

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…During further rapid cooling below the martensite start temperature, the deformed austenite transformed into martensite. Due to the effect of deformation in austenite and the very high cooling rate, martensite is formed with very fine martensite blocks and a large amount of retained austenite [31][32][33][34][35][36][37]. Other researchers [38,39] have also reported that the ratio of martensite to austenite depends a lot on laser power, scan speed, hatching pitch, and layer thickness.…”

Section: Resultsmentioning

confidence: 99%

Change in Microstructure and Hardness of Additively Manufactured Aisi H13 Steel by Heat Treatment and Nitriding Processes

Trinh,

Nguyen,

Pham

et al. 2023

Acta Metall Slovaca

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AISI H13 steel samples were additively manufactured using a laser powder bed fusion (LPBF) system. The effect of annealing tem-perature, quenching & tempering, and nitriding were determined. The microstructure and properties of the samples were investigated using optical microscopy, scanning electron microscopy, electron backscattered diffraction, electron probe micro-analysis, X-ray diffraction, roughness measurement, and a hardness tester. The results show that the as-built AISI H13 steel sample had a roughness on the surface and pores inside. The microstructure consisted of martensite and retained austenite. The average hardness was 460 HV, and the porosity was 0.086 %. The annealing process helped homogenize the microstructure, increase the density, and reduce the porosity and hardness of the LPBF-manufactured sample. The quenching process helped increase the hardness of the steel to the maximum of 787 HV, then the tempering process reduced the hardness to 572 HV. Heat treatment and nitriding processes tended to increase the martensite block size, reduce the retained austenitic content, and precipitate the V-Mo-rich carbide in the LPBF-manufactured AISI H13 steel. After nitriding was conducted, the nitriding case depth was 87 um, and the surface hardness increased up to higher than 1020 HV due to the formation of CrN and Fe3-4N.

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Section: Resultsmentioning

confidence: 99%

Change in Microstructure and Hardness of Additively Manufactured Aisi H13 Steel by Heat Treatment and Nitriding Processes

Trinh,

Nguyen,

Pham

et al. 2023

Acta Metall Slovaca

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“…It was demonstrated that the DQ&P process refined retained austenite, promoting the TRIP effect and toughness of the grade, in comparison to the alloy without Q&P treatment. The process proposed by Kantanen et al in [5] was designed for the industrial hot strip production of Fe-0.3C-2.0Mn-0.6Si-1.1Al-2.2Cr and Fe-03C-1.9Mn-1.0Si-1.0Cr (wt.%) steels. The positive effect of DQ&P on the volume fraction of retained austenite, tensile mechanical behaviour, and impact toughness was shown.…”

Section: Contributionsmentioning

confidence: 99%

Advanced High-Strength Steels by Quenching and Partitioning

Sabirov

Santofimia

Petrov

2021

Metals

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“…The process of steel quenching is one of the physically most complicated engineering processes which involves many physical processes, such as microstructure transformations, heat exchange, heat transfer and heat conduction, generation of distortion and residual stresses and crack formation [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Microstructure Constituents’ Hardness after the Isothermal Decomposition of Austenite

Hanza

Smoljan

Štic

et al. 2021

Metals

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An increase in technical requirements related to the prediction of mechanical properties of steel engineering components requires a deep understanding of relations which exist between microstructure, chemical composition and mechanical properties. This paper is dedicated to the research of the relation between steel hardness with the microstructure, chemical composition and temperature of isothermal decomposition of austenite. When setting the equations for predicting the hardness of microstructure constituents, it was assumed that: (1) The pearlite hardness depends on the carbon content in a steel and on the undercooling below the critical temperature, (2) the martensite hardness depends primarily on its carbon content, (3) the hardness of bainite can be between that of untempered martensite and pearlite in the same steel. The equations for estimation of microstructure constituents’ hardness after the isothermal decomposition of austenite have been proposed. By the comparison of predicted hardness using a mathematical model with experimental results, it can be concluded that hardness of considered low-alloy steels could be successfully predicted by the proposed model.

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Enhancing the Mechanical Properties of a Hot Rolled High-Strength Steel Produced by Ultra-Fast Cooling and Q&P Process

Cited by 9 publications

References 34 publications

Change in Microstructure and Hardness of Additively Manufactured Aisi H13 Steel by Heat Treatment and Nitriding Processes

Change in Microstructure and Hardness of Additively Manufactured Aisi H13 Steel by Heat Treatment and Nitriding Processes

Advanced High-Strength Steels by Quenching and Partitioning

Prediction of Microstructure Constituents’ Hardness after the Isothermal Decomposition of Austenite

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