Hall-Petch relationship for austenitic stainless steels processed by large strain warm rolling

Yanushkevich, Zhanna; Dobatkin, S. V.; Belyakov, Andrey; Kaibyshev, Rustam

doi:10.1016/j.actamat.2017.06.060

Cited by 107 publications

(63 citation statements)

References 50 publications

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“…The values of σ 0 * = 410 MPa and α = 0.3 are obtained from Figure b. Note here that almost the same values of α have been frequently used for the strength calculations in various other studies . Then, the yield strength of the austenitic stainless steel subjected to the multiple forging accompanied by the DRX development can be expressed as follows:

σ_{0.2} = true(σ_{0} + k_{ϵ} D^{- 0.5} true) F_{D R X} + true(σ_{0} * + α M G boldb ρ^{0.5} true) true(1 - F_{normalD normalR normalX} true)

…”

Section: Discussionmentioning

confidence: 99%

On Kinetics of Grain Refinement and Strengthening by Dynamic Recrystallization

et al. 2018

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The grain refinement and strengthening of an austenitic stainless steel are studied under multiple multidirectional forging at 1073 K up to strains of 4. The structural changes are characterized by the development of discontinuous and continuous dynamic recrystallization (DRX) leading to the grain refinement down to submicrometer level. The new ultrafine grains develop primarily along original grain boundaries and deformation microbands, leading to heterogeneous necklace-like microstructures at intermediate strains followed by rapid expansion of the DRX grains occupying the whole worked sample at large strains. The change in the fraction of ultrafine grains is commonly characterized by a sigmoid-type dependence on strain and can be expressed by a modified Jonson-Mehl-Avrami-Kolmogorov equation. The DRX development is accompanied by a stepwise decrease in the flow stress at reloading in each subsequent forging pass especially in intermediate strains. This stepwise softening results from rapid growth of freshly nucleated grains. In contrast, after forging, both the yield strength and ultimate tensile strength at room temperature increase progressively with an increase in the number of forging passes. The strengthening during DRX development can be attributed to concurrent contribution of work-hardening and grain refinement and can be expressed by a summation of recovered and recrystallized fractions.

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σ_{0.2} = true(σ_{0} + k_{ϵ} D^{- 0.5} true) F_{D R X} + true(σ_{0} * + α M G boldb ρ^{0.5} true) true(1 - F_{normalD normalR normalX} true)

…”

Section: Discussionmentioning

confidence: 99%

On Kinetics of Grain Refinement and Strengthening by Dynamic Recrystallization

et al. 2018

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“…The strength of work hardened metallic materials was treated with a modified Hall-Petch type relationship including the term of dislocation strengthening [16,17,34,35]. However, a mutual correlation between the dislocation densities and grain boundary densities in metals and alloys subjected to large strain deformation made the estimation of individual strengthening mechanisms difficult [32,36,37]. In contrast, the present approach of fractional contributions of different strengthening mechanisms, which are originated from specific structural elements, into overall strength allows us to adequately predict the yield strength of steels with a mixture of various work hardened, recovered, and recrystallized microstructures.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing

Kalinenko

Kusakin

Belyakov

et al. 2017

Metals

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Abstract:The structure-property relationship was studied in an Fe-18Mn-0.6C-1.5Al steel subjected to cold rolling to various total reductions from 20% to 80% and subsequent annealing for 30 min at temperatures of 673 to 973 K. The cold rolling resulted in significant strengthening of the steel. The hardness increased from 1900 to almost 6000 MPa after rolling reduction of 80%. Recovery of cold worked microstructure developed during annealing at temperatures of 673 and 773 K, resulting in slight softening, which did not exceed 0.2. On the other hand, static recrystallization readily developed in the cold rolled samples with total reductions above 20% during annealing at 873 and 973 K, leading to fractional softening of about 0.8. The recrystallized grain size depended on annealing temperature and rolling reduction; namely, it decreased with a decrease in the temperature and an increase in the rolling reduction. The mean recrystallized grain size from approximately 1 to 8 µm could be developed depending on the rolling/annealing conditions. The recovered and fine grained recrystallized steel samples were characterized by improved strength properties. The yield strength of the recovered, recrystallized, and partially recrystallized steel samples could be expressed by a unique relationship taking into account the fractional contributions from dislocation and grain size strengthening into overall strength.

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“…According to the equivalent grain size d eq in Table 2, it is verified that the grain size near the impact surface is smaller than that in the far-field on each reference surface, which agrees well with earlier observations. As the Hall-Petch relationship [20] predicted, as provided in Equation (13), the material hardness will be increased with the decrease of grain size, resulting in strain-hardening effect.…”

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confidence: 92%

Numerical Model of Plastic Deformation on Cracked Surface under Repeated Pneumatic Impact

Yuanzhou

Sun

et al. 2018

Advances in Materials Science and Engineering

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Crack-closure treatment through repeated impact is supposed to be an effective, economical way to extend the fatigue remaining life for fatigue-affected structures with less damage. The material plastic behavior under repeated impact between chisel and material bodies was investigated, for the purpose of describing the crack-closure effect. A numerical model was established associating the impact depth with the number of impact times and device parameters, which is also proved by experiments. The material properties, after repeated impact, was determined via metallographic analysis and microhardness tests, indicating that the material will be hardened within a small affected zone due to the grain refinement caused by repeated impact. The finite-element method was used, as a supplementary approach, to investigate the relationship between impact depth and horizontal deformation on the cracked surface. A one-to-one linear relation was obtained, even under the different chisel tip parameters. Therefore, the contact of fracture surface, i.e. crack closure, can be predicted with the help of this numerical model and the aforementioned relationship.

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Hall-Petch relationship for austenitic stainless steels processed by large strain warm rolling

Cited by 107 publications

References 50 publications

On Kinetics of Grain Refinement and Strengthening by Dynamic Recrystallization

On Kinetics of Grain Refinement and Strengthening by Dynamic Recrystallization

Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing

Numerical Model of Plastic Deformation on Cracked Surface under Repeated Pneumatic Impact

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