Effect of Tempering Mode on the Microstructure and Mechanical Properties of a Lean Alloy Martensitic Steel: Conventional Reheating Versus Induction Reheating

Wu, Bobo; Chen, H.; Chen, Shang; Xie, Kewei; Misra, R.D.K.

doi:10.1007/s11665-019-04072-5

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Moreover, the density of HAGBs (15° < θ < 45°) in the QIA sample was much higher than that in Q sample, which means that the PAGs are much finer in the QIA sample. The HAGBs can effectively deflect or arrest microcrack propagation, thereby enhancing toughness [34]. Thus, the heterogeneous microstructure with a high density of HAGBs is the basis of toughness improvement.…”

Section: Effect Of Heterogeneous Microstructure On Toughnessmentioning

confidence: 99%

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

Gao

et al. 2021

Int J Miner Metall Mater

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Here we present a novel approach of intercritical heat treatment for microstructure tailoring, in which intercritical annealing is introduced between conventional quenching and tempering. This induced a heterogeneous microstructure consisting of soft intercritical ferrite and hard tempered martensite, resulting in a low yield ratio (YR) and high impact toughness in a high-strength low-alloy steel. The initial yielding and subsequent work hardening behavior of the steel during tensile deformation were modified by the presence of soft intercritical ferrite after intercritical annealing, in comparison to the steel with full martensitic microstructure. The increase in YR was related to the reduction in hardness difference between the soft and hard phases due to the precipitation of nano-carbides and the recovery of dislocations during tempering. The excellent low-temperature toughness was ascribed not only to the decrease in probability of microcrack initiation for the reduction of hardness difference between two phases, but also to the increase in resistance of microcrack propagation caused by the high density of high angle grain boundaries.

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Section: Effect Of Heterogeneous Microstructure On Toughnessmentioning

confidence: 99%

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

Gao

et al. 2021

Int J Miner Metall Mater

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Optimization of furnace residence time and loading pattern during heat treatment of large size forgings

Arkhazloo

Bazdidi–Tehrani

Morin³

et al. 2021

Int J Adv Manuf Technol

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A combination of unsteady 3D CFD simulations and experimental temperature measurements was employed to determine the effect of loading patterns on the temperature distribution within steel forgings inside a gas-fired heat treatment furnace. This was aimed to obtain a more homogenous temperature distribution. Besides, a hybrid methodology using 3D numerical simulations and a high-resolution dilatometer allowed improving residence time of forgings inside the heat treatment furnace. The influence of the loading patterns and skids on temperature distribution and residence time of forgings was examined using thermal analysis four different loading patterns.Comprehensive unsteady thermal analysis of the products heating allowed quantifying the impact of skids usage and their dimensions on the extent of the uniformity of temperature distribution.The results were interpreted in terms of the inter-relationship between the skids usage, their geometry, absorbed radiation and convective heat fluxes. The analysis showed that temperature non-uniformities of up to 331 K could be produced for non-optimum loading patterns. Using the developed CFD approach it was possible to reduce the temperature non-uniformity of different sizes of blocks up to 32% via changing the loading pattern inside the furnace. Further, the slab's residence time was improved by almost 15.5% when employing the proposed hybrid approach. This approach could directly be applied to the optimization of different heat treatment cycles of forged blocks in different grades of steels.

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High-Si-Content Quenched and Tempered Steel for High-Strength Application

Sahoo

Kumar²,

Nageswaran³

et al. 2021

J. of Materi Eng and Perform

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Effect of Tempering Mode on the Microstructure and Mechanical Properties of a Lean Alloy Martensitic Steel: Conventional Reheating Versus Induction Reheating

Cited by 3 publications

References 30 publications

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

Determining role of heterogeneous microstructure in lowering yield ratio and enhancing impact toughness in high-strength low-alloy steel

Optimization of furnace residence time and loading pattern during heat treatment of large size forgings

High-Si-Content Quenched and Tempered Steel for High-Strength Application

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