Effect of Warm Rolling on the Structure and Tensile Properties of a Metastable Fe-Based Medium Entropy Alloy

Park, Hyojin; Lee, Jungwan; Kim, Rae Eon; Son, Sujung; Ahn, Soung Yeoul; Kim, Hyoung Seop

doi:10.1007/s12540-023-01532-5

Cited by 6 publications

(2 citation statements)

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“…temperatures. [15,16] The purpose of the warm rolling method is not to utilize a strain aging mechanism, but to obtain a heterogeneous microstructure by rolling at warm temperatures of 400-700 °C. Metallic materials produced through warm rolling method have an additional strengthening contribution called heterodeformation-induced strengthening due to local differences in pre-existing dislocation density.…”

Section: Resultsmentioning

confidence: 99%

“…However, most rolling/ pressing methods, including the warm rolling method, have a relatively high dislocation density than as-annealed counterparts, which improves strength while simultaneously decreasing elongation. For example, Park et al [15] further improved YS by %131.7% and UTS by %23.0% compared to the as-annealed state through warm rolling method for Fe-Co-Ni-Cr alloy, but sacrificed UEL by %85.0%. In contrast, the in situ strain aging process exhibited relatively small improvements in YS and UTS of %10.7% and %4.8%, respectively, but there was little decrease in UEL (%6.7% reduction in elongation).…”

Section: Resultsmentioning

confidence: 99%

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Improving the Mechanical Properties of Low‐Carbon Steel by In Situ Strain Aging

Gu,

Seo,

Kim

2023

Adv Eng Mater

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We have developed a novel continuous process that utilizes the concept of strain aging not only in the automotive industry but also in structural materials as a whole. The principle behind achieving in‐situ strain aging is as follows: (i) Dislocations are generated through compressive deformation during continuous pressing. (ii) The processing conditions at the strain aging temperature create a favorable environment for the diffusion of interstitial atoms, leading to the formation of Cottrell atmospheres. The in‐situ strain aging processed low‐carbon steel demonstrates a significant increase in strength compared to the unprocessed sample (increased yield strength by ∽37.6 MPa), which can be attributed to the strain aging effect, as well as the combined effects of grain refinement and pre‐existing dislocations. Additionally, the generation of dislocations during compressive deformation suppressed void nucleation during pre‐strain, preventing a loss of elongation (reduced uniform elongation by ∽1.5%). The in‐situ strain aging processed low‐carbon steel exhibited a superior strength‐elongation combination compared to both the unprocessed low‐carbon steel and strain aging simulated counterparts obtained through tensile deformation.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%