Strength and toughness of Fe-1.2Mn-0.3Cr-1.4Ni-0.4Mo-C tempered steel plate in three cooling processes

Chen, Jie; Li, Changsheng; Ren, Jia; Tu, Xingyang; Chen, Liqing

doi:10.1016/j.msea.2019.03.029

Cited by 34 publications

(19 citation statements)

References 42 publications

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“…h, k, and l are the Miller indices of each peak, and q is a parameter of dislocation character. According to the method in the literature [16], the dislocation densities were calculated as to be 2.18 × 10 14 m −2 , 4.17 × 10 14 m −2 and 5.12 × 10 14 m −2 for the sub-surface, t/4, and t/2 of the experimental steel, respectively.…”

Section: Xrdmentioning

confidence: 99%

Thickness Effect on Microstructure, Strength, and Toughness of a Quenched and Tempered 178 mm Thickness Steel Plate

Wang

et al. 2020

Metals

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We investigate here the thickness effect on microstructures and mechanical properties of a quenched and tempered 178 mm thickness ASTM A517 GrQ steel. The microstructures at sub-surface, 1/4 thickness (t/4), and 1/2 thickness (t/2) were characterized. A comparison of hardness, strength, and impact toughness of the different positions shows that the lowest strength and toughness occurred at t/2, where a mixture of coarse, tempered martensite and bainite were found, and their inter-lath boundaries were occupied with highly dense, film-like or coarse, spheroidized carbides. The cooling rate for transformation was measured to be 0.6 °C/s at t/2 from the industrial processing data. In addition, the alloy elements at t/2 were heavily segregated, as revealed by electron probe microanalysis (EPMA) and a microhardness test. The resulted coarse microstructures thus lowered both the yield strength and the impact energies significantly, e.g., the crack propagation energy was completely lost at −60 °C. This study correlates the variation of mechanical properties to varied transformed microstructures based on the industrial quenching condition, which shows promise for improving the designing of the hardenability and controlling the carbides for ultra-thick quenched and tempered steel.

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Section: Xrdmentioning

confidence: 99%

Thickness Effect on Microstructure, Strength, and Toughness of a Quenched and Tempered 178 mm Thickness Steel Plate

Wang

et al. 2020

Metals

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“…Therefore, the increase in the proportion of high-angle boundaries would lead to a more pronounced deflection of the crack path, resulting in an improved toughness. [32,33] 5. Conclusion 1) As the tempering temperature increases from 560 to 640 C, the tensile and the yield strength of HSLA steels decrease, whereas the elongation and the Charpy impact toughness (at À40 C) increase.…”

Section: Discussionmentioning

confidence: 99%

Study on Diversified Carbide Precipitation in High‐Strength Low‐Alloy Steel during Tempering

Wei

Zhou

Fang

et al. 2021

steel research int.

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Herein, the precipitation and mechanical properties of high-strength low-alloy steel (Q960E) under different tempering temperatures from 560 to 640 C are investigated. Diversified precipitations (including MC, M 3 C, M 23 C 6 , and M 7 C 3 ) are formed during tempering. The size of the M 3 C, M 23 C 6 , and M 7 C 3 precipitates increases, as the temperature increases, and the precipitates are gradually spheroidized with an average size of less than 100 nm. MC-type precipitates (where M ¼ Nb and Ti) are produced at different tempering temperatures. When tempered at 600 C, Q960E steel exhibits excellent mechanical properties, including a high strength and elongation with a good impact performance. At 600 C, a large number of fine MC carbides with an average size of less than 25 nm are formed. MC and matrix exhibit the Baker-Nutting orientation relationship. Edge dislocations exist in the transition region between the MC nanophase and the matrix. These dislocations reduce the mismatch degree between the MC nanophase and the matrix and promote MC nucleation. Meanwhile, the steel retains many low-angle grain boundaries when tempered at 600 C, which is beneficial to its high strength.

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“…With these drawbacks, the continuous casting billet could hardly achieve the best mechanical properties, leading to degrading of the finished product. [12][13][14][15] According to Han's [16] research, in some cases of excessive secondary cooling intensity condition, the temperature around the billet corner was around 500 °C, when it was out of the secondary cooling zone, while the temperature of the center surface was > 900 °C. The temperature difference between the billet corner and center surface after secondary cooling exceeded 400 °C.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Tempered Sorbite Formation and Related Enhanced Mechanical Properties for a Typical High Carbon Steel Billet Under Strong Cooling Intensity

Wang

Zeng

Zhou

et al. 2021

Metall Mater Trans B

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This article investigated the solidification structure evolution for a typical high-carbon steel billet under strong cooling intensity during the process of continuous casting. The results suggested that a regular solidification phase transformation route of 'austenite fi lamellar pearlite' was obtained in the center surface of billet; however, an abnormal microstructure evolution route of 'austenite fi martensite fi tempered sorbite (fine spheroidized cementite in the ferrite matrix)' appeared around the corner of billet. Besides, the secondary dendrite arm spacing for the center surface was 90.92 lm, and it reduced to 49.01 lm for the corner part because of different cooling conditions. In addition, the billet corner with a major tempered sorbite phase shows higher values of tensile strength, elongation and hardness, indicating sorbite phase could improve high carbon steel mechanical properties more significantly than the phase of lamellar pearlite because of its unique homogeneously distributed spheroidized structure. Furthermore, a laboratory experiment was conducted to verify the formation mechanism of tempered sorbite, and the results suggested that martensite phase would be formed around the billet corner under strong cooling intensity during the second cooling zone, and then the quenched martensite would be transferred to tempered sorbite, as the billet was out of the second cooling zone and reheated by its inner solidification heat.

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Strength and toughness of Fe-1.2Mn-0.3Cr-1.4Ni-0.4Mo-C tempered steel plate in three cooling processes

Cited by 34 publications

References 42 publications

Thickness Effect on Microstructure, Strength, and Toughness of a Quenched and Tempered 178 mm Thickness Steel Plate

Thickness Effect on Microstructure, Strength, and Toughness of a Quenched and Tempered 178 mm Thickness Steel Plate

Study on Diversified Carbide Precipitation in High‐Strength Low‐Alloy Steel during Tempering

Mechanism of Tempered Sorbite Formation and Related Enhanced Mechanical Properties for a Typical High Carbon Steel Billet Under Strong Cooling Intensity

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