The Significance of Microstructure Evolution on Governing Impact Toughness of Fe–0.2C–8.5Mn–3Al Medium‐Mn TRIP Steel Studied by a Novel Heat Treatment

Li, Zhichao; Mou, Yanjie; Li, Xinjing; Misra, Devesh; Ding, Hua; Lin, He; Li, Huiping

doi:10.1002/srin.202000029

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…The ductility is related to distribution, number density, depth, and size of dimples. 24 Under the same impact conditions, the quantity and size of dimples of quenched specimens at 700 to 750 °C were observed to be larger. While in the impact fracture of 800 °C specimens, besides a certain number of dimples, there was a small amount of tearing edges and platforms, and there were some particles on the tearing surface.…”

Section: Cryogenic-temperature Charpy Impact Propertiesmentioning

confidence: 85%

Impact toughness and fracture behaviour of a lamellar structural Fe–Mn–Al–C cryogenic steel

Zhang,

Li,

et al. 2024

Materials Science and Technology

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In this work, a nickel-free Fe–Mn–Al–C lightweight structural steel for cryogenic application was developed. Based on the quenching-tempering (Q-T) process, the samples were heated to 650, 700, 750 and 800 °C and then quenched and tempered at 200 °C. The microstructure evolution and impact toughness of the tested steel were studied by X-ray diffraction, OM, SEM, TEM and EPMA. The microstructure is mainly composed of δ-ferrite, tempered martensite and retained austenite. The partition of carbon and manganese elements affected the stability of austenite in the steels, resulting in the reduction of the TRIP effect. The lamellar structure was beneficial to the strength and the cryogenic impact toughness of the steel and improved the plastic deformation ability during deformation.

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Section: Cryogenic-temperature Charpy Impact Propertiesmentioning

confidence: 85%

Impact toughness and fracture behaviour of a lamellar structural Fe–Mn–Al–C cryogenic steel

Zhang,

Li,

et al. 2024

Materials Science and Technology

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“…On the whole, the dimples become smaller and shallower, the cleavage facets become larger and tear ridges become less. The larger the size of dimples in the fracture are, the higher the impact toughness values are of the corresponding experimental steel [43]. The bigger the cleavage facets are, the lower the impact toughness is.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment processes on the microstructure and mechanical properties of low alloy structural steels with different impurity tin contents

Sun

Wang

Shen

et al. 2022

Ironmaking & Steelmaking

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Conventional quenching and tempering (CQ-T) process does not always ensure the achievement of desired toughness of the steels with residual element tin. In the present work, a novel intercritical heat treatment (Q-IQ-T) process consisting of quenching (Q), intercritical quenching (IQ) and tempering (T) is adopted. The results show that the microstructure of the Q-IQ-T specimens consists of tempered martensite (M) and ferrite (F), which is finer than the full martensitic microstructure of the CQ-T specimens. 0.03%, 0.06% and 0.09% tin contents reduce the impact energy values of CQ-T specimens by 22.95%, 29.61% and 45.93%, respectively, while those of the Q-IQ-T specimens decrease by 19.25%, 17.32% and 21.32%, respectively. Together with comparison to the CQ-T specimen with 0.09% tin, the impact energy value of Q-IQ-T specimen increases by 85.24%, from 40.86 J to 75.69 J. And the fracture morphology changes from brittle fracture to ductile fracture.

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“…The 3DAP and EPMA results demonstrate that the tempering treatment strongly improves the repartition of C from α’ to γ in the annealed sample, and similar results in MMS are obtained in other studies. [ 28,29 ] The diffusion length ( l ) and diffusion coefficient ( D ) of C and Mn were evaluated by using the following equations. [ 26,30 ]

l = \sqrt{6 D \times t}

D_{normalC}^{BCC} = 0.394 \times 10^{- 6} \exp false(- 80220 / R T false)

D_{normalC}^{FCC} = 0.394 \times 10^{- 6} \exp false(- 80220 / R T false) m^{2} s^{- 1}

D_{Mn}^{BCC} = 75.6 \times 10^{- 5} \exp false(- 224500 / R T false) m^{2} s^{- 1}

where t is the tempering time;

D_{normalC}^{BCC}

and

D_{normalC}^{FCC}

are the diffusion coefficients of the C atoms in the body centered cubic (BCC) and face centered cubic (FCC) lattices, respectively;

D_{M n}^{BCC}

is the diffusion coefficient of the Mn atoms in the BCC lattice; T is the temperature; and R is the gas constant (8.314 J mol −1 K).…”

Section: Discussionmentioning

confidence: 99%

“…The 3DAP and EPMA results demonstrate that the tempering treatment strongly improves the repartition of C from α' to γ in the annealed sample, and similar results in MMS are obtained in other studies. [28,29] The diffusion length (l) and diffusion coefficient (D) of C and Mn were evaluated by using the following equations. [26,30] l ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffi ffi 6D Â t p…”

Section: Phase Transformation Behaviormentioning

confidence: 99%

Potential Significance of Low Tempering Treatment in Improving the Mechanical Properties of a Cold‐Rolled and Intercritical Annealed Medium Mn Steel

Zhang

Duan

Liu

et al. 2022

steel research int.

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Herein, the effect of tempering at 200 °C for 20 min on the mechanical properties of a cold-rolled and intercritical annealed medium Mn steel is investigated in this study. This effect is mainly dependent on the original annealing condition. For the sample annealed at a relatively low temperature (660 °C), the austenite stability of this sample is further improved significantly after tempering. Thus, the transformation-induced plasticity (TRIP) effect is severely inhibited during deformation, which leads to a decrease in the properties of the sample. By contrast, for the sample possessing suitable austenite fraction (%30%) and heterostructure, that is, the sample annealed at 680 °C for 10 min, the simultaneously increased strength and ductility are significantly intrigued by tempering treatment. Electron probe microanalysis and 3D atom probe results reveal that C concentration in austenite is increased due to the C repartition during tempering, which leads to the persistent TRIP effect in a broad strain range during tensile deformation. In addition, the heterogeneous-deformation-induced stress of the heterostructured sample is found to be obviously intensified by tempering treatment. Thus, an excellent strength plastic synergistic effect with a product of ultimate tensile strength and total elongation of approximately 70 GPa% is obtained in the tempered sample.

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The Significance of Microstructure Evolution on Governing Impact Toughness of Fe–0.2C–8.5Mn–3Al Medium‐Mn TRIP Steel Studied by a Novel Heat Treatment

Cited by 6 publications

References 29 publications

Impact toughness and fracture behaviour of a lamellar structural Fe–Mn–Al–C cryogenic steel

Impact toughness and fracture behaviour of a lamellar structural Fe–Mn–Al–C cryogenic steel

Effect of heat treatment processes on the microstructure and mechanical properties of low alloy structural steels with different impurity tin contents

Potential Significance of Low Tempering Treatment in Improving the Mechanical Properties of a Cold‐Rolled and Intercritical Annealed Medium Mn Steel

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