Isothermal Phase Transformations in a Low Carbon Steel During Single and Two-Step Partitioning

Cerda, Felipe Manuel Castro; Hernández, Edgar; Ros-Yanez, T.; Petrov, Roumen

doi:10.1007/s11661-020-05643-1

Cited by 6 publications

(7 citation statements)

References 24 publications

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“…black arrows in Figure 2a,d) in which no precipitation is observed. This observation has been previously reported and discussed elsewhere, [ 28 ] and it is suggested that the growth of carbides at the α M / γ interface during the isothermal holding could explain the rim of fresh martensite formed during the final cooling.…”

Section: Discussionsupporting

confidence: 86%

“…The present findings are consistent with the results of a previous study. [ 28 ] It is interesting to compare the former discussion with the results of the simulation study by Dai et al, [ 19 ] whereby NPLE conditions deliver carbon contents in austenite almost independent of QT. Although not discussed by Dai et al, [ 19 ] NPLE conditions are likely to establish during diffusional growth of bainitic ferrite.…”

Section: Discussionmentioning

confidence: 91%

“…The data analysis was carried out according to the same methodology of a previous study. [ 28 ] The temperature variation of phase fractions was calculated by applying the lever rule to the dilatometric curves. The microstructural evolution of the samples was characterized via scanning electron microscopy (SEM).…”

Section: Discussionmentioning

confidence: 99%

“…The methodology for calculating the carbon content of austenite according to the three constrained equilibrium models (CCE, CCEθ, and BCEθ), and the carbon content of austenite in equilibrium with bainite according to the diffusional and displacive paradigms (WB S and T 0 ’, respectively) is described in detail in a previous work. [ 28 ]…”

Section: Discussionmentioning

confidence: 99%

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Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S

Cerda

Goulas

Hernández

et al. 2023

steel research int.

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Isothermal heat treatments below the martensite start temperature are carried out in a 0.25C-1.4Mn-1.4Si-0.32Mo steel (in wt%). The microstructural observation reveals a combination of tempered lath and plate martensite, accompanied by bainite and retained austenite. The temperature variation of the austenitic carbon content under different constrained equilibrium models is calculated and compared with experimental measurements. Neither of the existing models seems to predict the behavior of the measured austenitic carbon content in the temperature range studied. The results suggest that the diffusional formation of bainite governs the carbon content of austenite at temperatures nearby the M S .

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Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S

Cerda

Goulas

Hernández

et al. 2023

steel research int.

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“…[8,9] The cold-rolled Q&P that conducted on cold-rolled sheets has two separate parts to tailor microstructure and mechanical properties. [10][11][12] Parthiban et al [13] reported a combination of TMCP and Q&P process to obtain excellent performance. Chen et al [14] conducted thermomechanical simulations, combined a deformation-induced ferrite transformation and Q&P process, and finally achieved an improved ductility.…”

Section: Introductionmentioning

confidence: 99%

A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment

Wang

Zhang

et al. 2023

steel research int.

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The present work is aimed at a process to obtain a hot‐galvanized quenching and partitioning (Q&P) steel with excellent yield–ductility synergy by prior treatment. For this purpose, the cold‐rolled sheets with ferrite–pearlite structure are applied to “quenching (Q),” “quenching and tempering (Q&T),” “quenching and austempering (QAT),” and “quenching and austempering followed by tempering (QAT&T)” before the continuous galvanizing line (CGL)‐compatible Q&P treatment. Compared with Q&P sample, Q + Q&P, Q&T + Q&P, QAT + Q&P, and QAT&T + Q&P samples can obtain more homogeneous filmy/lath retained austenite (RA) with an increased C concentration, which can provide the transformation‐induced plasticity (TRIP) effect and improve elongation significantly. The maximum austenite reverse transformation rates are obtained in Q&T and QAT&T samples because of the increased nucleation sites, such as grain boundaries and cementite particles. QAT&T + Q&P sample has the longest plateau region before break and obtains the attractive mechanical properties with a yield strength of 694 MPa, tensile strength of 927 MPa, total elongation of 31.3%, and product of strength and elongation above 29 GPa%.

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The Reliability of Single-Step and Double-Step Quench and Partitioning Heat Treatments on an AISI 420A Low Carbon Martensitic Stainless Steel

Barella

Gruttadauria

Menezes

et al. 2023

Metall Mater Trans A

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The microstructural and mechanical effects of various single-step (SS) and double-step (DS) quench and partition (Q&P) heat treatments applied to an AISI 420A low carbon martensitic stainless steel (MSS) has been studied. The goal with this work is to reach a total elongation (E pct) of 12 pct and an ultimate tensile strength (UTS) above 1200/1300 MPa, but ultimately to achieve a superior strength-ductility balance in comparison to its traditional Quench and Temper (Q&T) counterpart. This is being done by retaining austenite within the steel’s martensitic matrix at room temperature (RT) using novel SS and conventional DS Q&P heat treatments. Considerable work has been done to optimize DS Q&P heat treatments, but little has been done to understand the effects of removing a subsequent heating cycle through SS Q&P heat treatments has on MSSs. With that being said, partitioning is performed at the same quench interruption temperature for the SS Q&P heat treatments, and reheated to a higher temperature for the DS Q&P heat treatments. Experimental investigations were carried out on 1 mm thick, sheet samples to increase the number of potential applications for this steel and heat treatment. The microstructure of different SS and DS Q&P heat treatments was investigated through X-ray diffraction (XRD) and transmission electron microscopy (TEM) while mechanical property investigations were carried out using tensile and fracture toughness testing. DS Q&P heat treated samples quenched to 130 °C and partitioned for industrially relevant times of 10 and 30 minutes featured the highest values in terms of total elongation, tensile strength and fracture toughness. The SS Q&P heat treatments, on the other hand, were able to achieve improved mechanical properties to its Q&T counterpart. Overall, this work opens up the possibility of increased MSS usage for reliable, thin-walled component production with improved properties through Q&P heat treatment methods. The best results achieved in this study are a UTS of 1585 MPa, E pct of 22 pct, and a fracture toughness of 77 kJ/m2. Their lower total elongation of 9.6 pct is balanced by high tensile strength of 1812 MPa, ensuring higher toughness compared to traditional Q&T samples.

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Isothermal Phase Transformations in a Low Carbon Steel During Single and Two-Step Partitioning

Cited by 6 publications

References 24 publications

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S

A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment

The Reliability of Single-Step and Double-Step Quench and Partitioning Heat Treatments on an AISI 420A Low Carbon Martensitic Stainless Steel

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Isothermal Phase Transformations in a Low Carbon Steel During Single and Two-Step Partitioning

Cited by 6 publications

References 24 publications

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the MS

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the MS

A Novel Process for Hot‐Galvanized Quenching and Partitioning Steel with Excellent Yield–Ductility Synergy by Prior Treatment

The Reliability of Single-Step and Double-Step Quench and Partitioning Heat Treatments on an AISI 420A Low Carbon Martensitic Stainless Steel

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Product

Resources

About

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S

Constrained Equilibrium Reactions in a Low Carbon Steel During Heat Treatments Below the M_S