Rapid tempering of a medium-carbon martensitic steel: In-depth exploration of the microstructure – mechanical property evolution

Javaheri, Vahid; Pallaspuro, Sakari; Sadeghpour, Saeed; Ghosh, Sumit; Sainio, Johannes; Latypova, Renata; Kömi, Jukka

doi:10.1016/j.matdes.2023.112059

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…However, precipitation of cementite leads to almost full dissolution of the transition carbides. Partitioning at 500 • C with a duration of up to 100 s could be considered rapid tempering since no extensive precipitation of cementite occurs [50,51]. It should be noted that cementite particles were not observed in the microstructure after partitioning at 500 • C for 20 s (Figure 6b).…”

Section: Microstructure After Qandp Processingmentioning

confidence: 99%

Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment

Tkachev,

Borisov,

Borisova

et al. 2023

Crystals

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The effect of quenching and partitioning (Q&P) processing on strength, ductility and fracture toughness is considered in a 0.33% C-1.8% Si-1.44 Mn-0.58% Cr steel. The steel was fully austenitized at 900 °C and quenched to 210 °C for 30 s. Partitioning at 350 °C for 600 s produces a martensitic matrix with transition carbides, bainitic ferrite and film-like retained austenite (RA) that is stable against transformation to strain-induced martensite under tension. This processing provided the highest strength and fracture toughness but the lowest ductility and product of strength and elongation (PSE), σB·δ (MPa·%). Partitioning at 500 °C produced RA with a relatively low carbon content and low volume fraction of carbides. The steel after this Q&P processing exhibits the highest ductility and PSE but low YS and Charpy V-notch (CVN) impact toughness. High ductility and PSE correlate with the ability of RA to transform into strain-induced martensite, while high strength and impact toughness are associated with the high-volume fraction of transition carbides in the carbon-depleted martensitic matrix and a lack of transformation of RA to strain-induced martensite. The highest CVN impact energy was attained in the steel exhibiting transgranular quasi-cleavage fracture with the lowest effective grain size for brittle fracture. No correlation between strength, ductility and fracture toughness is observed in Q&P steels if these materials have distinct structural constituents.

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Section: Microstructure After Qandp Processingmentioning

confidence: 99%

Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment

Tkachev,

Borisov,

Borisova

et al. 2023

Crystals

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“…Almost no boundary carbides precipitate in these steels up to ~450 • C [20,29]. No cementite appears due to the decomposition of RA occurring at T ≤ 400 • C [20,29], that is, in contrast with steels with Si ≤ 0.5 wt.% [3,6,7,10,14,19,31]. In addition, the volume fraction of RA after water quenching in these steels is negligible (~1%).…”

Section: Introductionmentioning

confidence: 96%

Quench and Tempered Embrittlement of Ultra-High-Strength Steels with Transition Carbides

Mishnev

Borisova

Kniaziuk

et al. 2023

Metals

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The effect of tempering after water quenching on the strength and fracture toughness of two steels with chemical compositions of 0.34%C-1.77%Si-1.35Mn-0.56%Cr-0.2%Mo-0.04%Nb-0.03Ti-0.002B and 0.44%C-1.81%Si-1.33%Mn-0.82%Cr-0.28%Mo was examined. The last steel exhibits quenching embrittlement in an as-quenched condition. At a tempering temperature of 280 °C, the precipitation of transition η–Fe2C carbides in martensitic matrix leads to increasing fracture toughness and eliminates quench embrittlement in the steel with 0.44 wt.%C. Tempered martensite embrittlement at 400 °C appears as decreased values of the Charpy V-notch impact energy, ductility and the product of strength and elongation, σB´δ (MPa´%) and is attributed to increased effective grain size for fracture, mainly. The precipitation of boundary cementite takes place at tempering at 500 °C and provides increased ductility and fracture toughness despite a decohesion along carbide/ferrite interfaces. The low severity of TME in Si-rich low-alloy medium carbon steels is attributed to the suppression of boundary cementite precipitation at tempering temperatures ≤400 °C.

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Rapid annealing of an ultralow carbon steel: in-depth exploration of the microstructure-mechanical properties evolution

Yuan,

Ren,

Tang

et al. 2023

Journal of Materials Research and Technology

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Rapid tempering of a medium-carbon martensitic steel: In-depth exploration of the microstructure – mechanical property evolution

Cited by 6 publications

References 44 publications

Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment

Relationships between Strength, Ductility and Fracture Toughness in a 0.33C Steel after Quenching and Partitioning (Q&P) Treatment

Quench and Tempered Embrittlement of Ultra-High-Strength Steels with Transition Carbides

Rapid annealing of an ultralow carbon steel: in-depth exploration of the microstructure-mechanical properties evolution

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