Estimation of Hardenability of Steels

Kanazawa, Shogo

doi:10.2355/tetsutohagane1955.67.2_295

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…This is consistent with previous studies on the hardenability of steels. 24) In addition, as shown in Fig. 3, the lamella spacing of the pearlite decreased with increasing Cr addition.…”

Section: Effect Of Cr On Microstructure Of Base Materialsmentioning

confidence: 75%

Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels

Nagira

Ushioda

et al. 2023

ISIJ Int.

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The 0.2C-2Si (mass%) steels with the addition of 0-4 mass% Cr were prepared by hot rolling followed by subsequent annealing for normalization. The steels were subjected to friction stir welding (FSW) conducted above A 3 temperature. For all the steels, sound FSWed joints were obtained. Microstructures and tensile properties using small tensile specimens were investigated for both base materials and stir zones. The base materials showed a relatively good balance of strength and ductility when the Cr content is over 3 mass% presumably owing to the relatively fine microstructures of ferrite and martensite. The tensile properties of stir zones were substantially enhanced by FSW, and the stir zone of the 0.2C-2Si-4Cr joint with fully martensitic structure exhibited the surprisingly high tensile strength of 1 720 MPa compared with that of the conventional martensitic steel of 0.2 mass%C together with the excellent balance of ductility. This is assumed to be caused by the refinement of block size in the fresh lath martensite and/or the formation of ausformed martensite induced by the dynamically recrystallized fine austenite grains by FSW of the Cr added steels.

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“…This is consistent with previous studies on the hardenability of steels. 24) In addition, as shown in Fig. 3, the lamella spacing of the pearlite decreased with increasing Cr addition.…”

Section: Effect Of Cr On Microstructure Of Base Materialsmentioning

confidence: 75%

Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels

Nagira

Ushioda

et al. 2023

ISIJ Int.

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“…Hardenability is a fundamental property of steel that has been of immense interest for many years. Early systematic work on hardenability was carried out by Grossmann [2,3], Jominy [4,5], and others [6,7]. Prediction of hardening behavior of steel primarily includes the determination of hardenability parameters, namely D I (ideal critical diameter) and D C (Grossmann critical diameter or actual critical diameter), as well as the variation in the ratio of the unhardened core diameter (D u ) to diameter of the steel bar (D).…”

Section: Introductionmentioning

confidence: 99%

A Pure Implicit Finite Difference-Based Modeling Approach for Prediction of the Hardenability of Eutectoid Steel

Singh

Mondal

Mishra

et al. 2014

Metallogr. Microstruct. Anal.

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In this work, an independent pure implicit finite difference-based modeling approach has been adopted for the determination of the hardenability of eutectoid steel. In this model, cooling curves were generated by solving transient heat transfer equations through discretization with pure implicit finite difference scheme in view of constant effective thermophysical properties of AISI-1080 steel. The cooling curves were solved against the 50% transformation nose of the time-temperature-transformation diagram in order to predict hardening behavior of AISI-1080 steel in terms of hardenability parameters (Grossmann critical diameter, D C ; and ideal critical diameter, D I ) and the variation of the ratio of the unhardened core diameter (D u ) to diameter of steel bar (D). Furthermore, a relationship is established between the Grossmann critical diameter and the heat transfer coefficient. The hardenability predicted by the developed model was found to match reasonably with that obtained through the chemical composition method. Therefore, the model developed in the present work can be used for direct determination of D C , D I , and D u without resorting to any rigorous experimentation.

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“…Hardenability is a fundamental property of steel that has been of much interest to engineers for many years. The early systematic work on hardenability was done by Grossmann, Jominy, and others . Prediction of hardening behavior of steel primarily includes the determination of hardenability parameters, namely D I (ideal critical diameter) and D C (Grossmann critical diameter or actual critical diameter) as well as studying the variation of the unhardened core diameter ( D u ) to diameter of steel bar ( D ) ratio with diameter of the steel bar ( D ).…”

Section: Introductionmentioning

confidence: 99%

“…The early systematic work on hardenability was done by Grossmann, [2,3] Jominy, [4,5] and others. [6,7] Prediction of hardening behavior of steel primarily includes the determination of hardenability parameters, namely D I (ideal critical diameter) and D C (Grossmann critical diameter or actual critical diameter) as well as studying the variation of the unhardened core diameter (D u ) to diameter of steel bar (D) ratio with diameter of the steel bar (D). As defined by Grossmann, D C is the diameter of the cylindrical steel bar whose centre, upon hardening treatment, contains 50% martensite.…”

Section: Introductionmentioning

confidence: 99%

An Independent Modeling Approach for Prediction of Hardenability in Steels

Sushanthi

Maity

2015

steel research int.

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In this research work an independent mathematical modeling approach has been adopted for determination of the hardenability of steels. In this model, at first, cooling curves were generated by solving transient heat transfer equation through discretization with pure explicit finite difference scheme coupled with MATLAB based programming considering effective constant thermo-physical properties of 1080 steel. Thereafter, Grange-Kiefer approach was extended for determination of 50% transformation nose of CCT diagram. The cooling curves were solved against 50% transformation nose of CCT diagram in order to predict hardening behavior of 1080 steel in terms of hardenability parameters (Grossmann critical diameter, D C ; and ideal critical diameter, D I ) and the variation of the unhardened core diameter (D u ) to diameter of steel bar (D) ratio with diameter of the steel bar (D). The experiments were also performed to ascertain actual D C value of 1080 steel for still water quenching. The D C value obtained by the developed model was found to match the experimental D C value with only 8% deviation. Therefore, the model developed in the present work can be used for direct determination of D I , D C , and D u without resorting to any rigorous experimentation.

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Estimation of Hardenability of Steels

Cited by 7 publications

References 1 publication

Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels

Microstructures and Tensile Properties of Friction Stir Welded 0.2%C-2%Si-Cr Steels

A Pure Implicit Finite Difference-Based Modeling Approach for Prediction of the Hardenability of Eutectoid Steel

An Independent Modeling Approach for Prediction of Hardenability in Steels

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