Design of Structure, Composition and Heat Treatment Process for High Strength Steel

Hsu, T.Y.; Xu, Zu Yao

doi:10.4028/0-87849-462-6.2283

Cited by 10 publications

(10 citation statements)

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“…The addition of Si can suppress the precipitation of brittle cementite (Fe 3 C) [9]. The addition of Nb can promote the formation of stable carbides and refine grains effectively [2]. The M s and M f temperature of this high carbon steel were respectively determined as 209°C and 75°C by JMatPro simulation software.…”

Section: Methodsmentioning

confidence: 99%

“…However, Q&P process excludes the precipitation of carbides and precipitation strengthening. For the sake, Hsu proposed the quenching-partitioning-tempering (Q-P-T) process in 2007 [2]. Since Q-P-T process absorbs the core idea of Q&P process: the determination of T q based on 'constrained carbon paraequilibrium' (CCE) theory of Q&P process [1], Q-P-T steels can also obtain considerable carbon-enriched retained austenite by the partitioning of carbon, meanwhile, during partitioning /tempering dispersive carbides precipitate from martensitic matrix.…”

Section: Introductionmentioning

confidence: 99%

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Approach and mechanism of toughness enhancement for a high carbon Q-P-T steel

Qin

Liu

Zhang

et al. 2019

Heat Treatment and Surface Engineering

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Based on the previous study of Cr-containing Fe-0.63C-1.52Mn-1.49Si-0.62Cr-0.036Nb high carbon steel, although normalization process as a pretreatment of quenching-partitioningtempering (Q-P-T) was performed in this high carbon steel to raise the ductility, its impact toughness only is 7.4 J/cm 2 . Microstructural characterization reveals that strain-induced twintype martensite transformed from considerable chunky retained austenite destroys toughness. Therefore, a novel Cr-free Fe-0.67C-1.52Mn-1.49Si-0.038Nb (wt.%) high carbon steel was designed and normalization process as pretreatment of Q-P-T process was still employed so that the volume fraction of retained austenite evidently decreases from 21% to 10%. This high carbon steel not only keeps high tensile strength (1660 MPa) and elongation (29.0%), but also exhibits high impact toughness of 33.2 J/cm 2 . The high impact toughness is attributed to the elimination of chunky retained austenite accompanying dispersive and fine retained austenite with high mechanical stability, which effectively reduces the formation of brittle strain-induced twin-type martensite during deformation. KEYWORDSHigh carbon martensitic steel; mechanical stability of retained austenite; impact toughness; quenchingpartitioning-tempering (Q-P-T) process; normalization process

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Approach and mechanism of toughness enhancement for a high carbon Q-P-T steel

Qin

Liu

Zhang

et al. 2019

Heat Treatment and Surface Engineering

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“…In order to emphasize the addition of carbide-forming elements such as Nb to explore the effect of grain refining and precipitation strengthening on the strength of Q-P steel, Hsu further proposed the quenching-partitioning-tempering (Q-P-T) process (Hsu, 2007). Zhong et al (Zhong et al, 2009) have conducted a Q-P-T treatment to a Fe-0.2C-1.5Mn-1.5Si-0.05Nb-0.13Mo steel and a good combination of strength (1500MPa) and elongation (15%) was obtained, showing the beneficial effect of the Q-P-T process.…”

Section: Introductionmentioning

confidence: 99%

Effect of a quenching–long partitioning treatment on the microstructure and mechanical properties of a 0.2C% bainitic steel

Huang

Liu

Huang

et al. 2015

Journal of Materials Processing Technology

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“…The addition of Mn and Cr elements is to stabilize the austenite [9]. Besides, quenching-partitioning-tempering (Q-P-T) process proposed by Hsu [10] in 2007 was used to treat the above high carbon steels. Since Q-P-T process absorbs the core idea of quenching and partitioning (Q&P) process proposed by Speer et al in 2003 [11]: the determination of T q based on 'constrained carbon paraequilibrium' (CCE) theory of Q&P process [11], Q-P-T steels can also obtain considerable carbon-enriched retained austenite by the partitioning of carbon.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al replacing Si on mechanical properties of high carbon Q–P–T martensitic steels

Zhang

Qin

Liu

et al. 2019

Heat Treatment and Surface Engineering

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2019) Effect of Al replacing Si on mechanical properties of high carbon Q-P-T martensitic steels, Heat Treatment and Surface Engineering, 1:1-2, 17-22, ABSTRACT Fe-0.67C-1.55Mn-1.99Al-0.60Cr-0.038Nb (Fe-2Al) and Fe-0.63C-1.52Mn-1.49Si-0.62Cr-0.036Nb (wt.%) (Fe-1.5Si) were designed and both subjected to novel quenchingpartitioning-tempering (Q-P-T) process, and the effect of 2 wt.% Al replacing 1.5 wt.% Si on mechanical properties was studied. The Fe-2Al Q-P-T martensitic steel exhibited a tensile strength of 1640 MPa and elongation of 21.1% accompanied with product of strength and elongation (PSE) of 43.65 GPa %, which is superior to the third generation advanced high strength of 30 GPa %. While the tensile strength of Fe-1.5Si Q-P-T martensitic steel is 1.950 GPa, and the total elongation only is 12.4%, whose PSE is less than 30 GPa %. High ductility of Fe-2Al Q-P-T martensitic steel origins from that the dislocation absorption by retained austenite effect and high mechanical stability of retained austenite due to the addition of Al, which avoids the formation of more brittle strain -induced twin-type martensite from retained austenite transformation. The lower strength of Fe-2Al Q-P-T steel than Fe-1.5Si Q-P-T steel is attributed to lower elastic modulus of former steel after Q-P-T process.

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Design of Structure, Composition and Heat Treatment Process for High Strength Steel

Cited by 10 publications

References 0 publications

Approach and mechanism of toughness enhancement for a high carbon Q-P-T steel

Approach and mechanism of toughness enhancement for a high carbon Q-P-T steel

Effect of a quenching–long partitioning treatment on the microstructure and mechanical properties of a 0.2C% bainitic steel

Effect of Al replacing Si on mechanical properties of high carbon Q–P–T martensitic steels

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