Heat Treatment Design for a QP Steel: Effect of Partitioning Temperature

Carpio, Marcel; Calvo, Jessica; García, Omar; Pedraza, Juan Pablo; Cabrera, J.M.

doi:10.3390/met11071136

Cited by 20 publications

(6 citation statements)

References 46 publications

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“…The lack of the proportional dependence between the PSE and CVN impact energy was observed in Q&P steels with C ≤ 0.3 wt.% that exhibit PSE values ranging from 1.0 × 10 4 to 2.7 × 10 4 MPa•% with YS ranging from 1050 to 1250 MPa and CVN impact energy ranging from 60 to 110 J [21,[25][26][27][28]. Film-like RA dominates in these Q&P steels [5,[27][28][29]. Kai Yang et al [28] showed that the combination of the ductility, PSE and Charpy V-notch (CVN) impact absorbed energy mainly depends on the stability of the film-like RA during tensile or impact tests [30].…”

Section: Introductionmentioning

confidence: 86%

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: Introductionmentioning

confidence: 86%

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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“…When the yielding is discontinuous, stretch marks (Lüder's bands) could develop during the forming operations and compromise the surface quality of the final component. The grades belonging to AHSS class of steels are typically characterised by a continuous yielding behaviour [5,[10][11][12][13] and the investigation on the yielding behaviour of AHSS is rather limited in the literature. The current work is an extension of the work published recently by the current authors [14].…”

Section: Introductionmentioning

confidence: 99%

Yield point phenomenon in low-alloyed TRIP-aided steel: Role of retained austenite

Ranjan

Beladi

Hodgson

et al. 2023

Materials Science and Technology

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Multiphase TRIP-aided steels are generally characterised by a continuous yielding behaviour. The processing route involving a deformation step in the intercritical (ferrite + austenite) region showed an undesirable discontinuous yielding. This is attributed to the formation of fresh dislocations in the soft ferrite matrix that trap the diffusing carbon and form Cottrell atmospheres. The discontinuous yielding disappears when fresh mobile dislocations are introduced through transformation of the retained austenite to martensite.

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“…[20,31] Therefore the selection of PT and t p can generate very different sets of tensile properties. [13,25,32] Speer et al first proposed the carbon-constrained equilibrium (CCE) theoretical model that was implemented to design the first guess optimal partitioning temperature. [1,33] The CCE model is based on three hypotheses: only carbon diffusion is considered; carbon entirely diffuses from martensite to austenite without forming carbides, and a fixed interface is present.…”

Section: Introductionmentioning

confidence: 99%

“…[ 20,31 ] Therefore the selection of PT and t p can generate very different sets of tensile properties. [ 13,25,32 ]…”

Section: Introductionmentioning

confidence: 99%

Influence of Quenching and Partitioning on the Mechanical Properties of Low‐Silicon 33MnCrB5 Boron Steel

Barella,

Belfi,

Gruttadauria

et al. 2023

steel research int.

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Quenching and partitioning (QP) is a heat treatment that is designed to enhance both the mechanical properties and ductility of low‐ and medium‐carbon steels. This treatment is performed on steels with a tailored chemical composition. Herein, QP treatments are designed and performed on commercial low‐silicon 33MnCrB5 boron steel. Different temperatures (evaluated using thermodynamic simulations) and times are tested. Scanning electron microscopy investigations are conducted to observe the microstructure, whereas X‐ray diffraction and electron backscattered diffraction analyses are performed to assess the presence and amount of retained austenite (RA). Tensile tests are performed to investigate the mechanical properties. The designed treatments introduce a fraction of up to 4.6% of RA in the final microstructure. Tensile tests show that the QP samples are characterized by high ultimate tensile strength (1633–1756 MPa) with an increased elongation at break with respect to the reference quenching and tempering condition (16–18% versus 9%). Hardening coefficients are linked to martensite tempering in the initial stages of plastic deformation, whereas at higher strains, they are mostly influenced by RA presence. The proposed treatments are successfully performed on 33MnCrB5 grade, leading to a set of tensile properties that are not exploitable with traditional treatments.

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Heat Treatment Design for a QP Steel: Effect of Partitioning Temperature

Cited by 20 publications

References 46 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

Yield point phenomenon in low-alloyed TRIP-aided steel: Role of retained austenite

Influence of Quenching and Partitioning on the Mechanical Properties of Low‐Silicon 33MnCrB5 Boron Steel

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