Flow stress dependence on the distribution of grain size in polycrystals

Kurzydłowski, Krzysztof J.; Bucki, Janusz

doi:10.1016/0956-7151(93)90044-s

Cited by 50 publications

(37 citation statements)

References 15 publications

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“…The contribution of each grain to the strength of the material is considered to be proportional to the volume of the grain; see e.g. [17,22]. Thus, the volume-weighted average grain size is defined as:…”

Section: Definitionsmentioning

confidence: 99%

“…The same assumptions have been used in various numerical simulations of fictitious grain size distributions [16,[24][25][26][27]. However, the previous studies [8,[16][17][18][19][20][21]24,27] are focused on single phase base materials and do not cover heterogeneous weld metals.…”

Section: Introductionmentioning

confidence: 99%

“…Typically the average grain size is used to describe the microstructure [16], but its suitability for heterogeneous microstructures is questionable. Several investigations [8,[16][17][18][19][20][21] have shown that the grain size distribution has an effect on the mechanical properties. For example, Berbenni et al [20] showed that for a given average grain size, broadening of the grain size dispersion reduces the strength of the material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Lehto

Remes

Saukkonen

et al. 2014

Materials Science and Engineering: A

193

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The strength of polycrystalline metals increases with a decrease in grain size according to the HallPetch relationship. However, heterogeneous microstructures deviate from this relationship depending on the distribution of grain sizes. This paper introduces a rule of mixtures based approach for determining the characteristic length of the microstructure for heterogeneous weld metal. The proposed grain size parameter, the volume-weighted average grain size, is measured experimentally for nine structural steel weld metals and two base materials. The weld metals are found to have a large variety of grain size distributions that are noticeably broader than those of the base material due to differences in phase contents. The results show that the volume-weighted average grain size is able to capture the influence of grain size distribution on the strength of welded structural steel. Based on the experimental results, a modified Hall-Petch relationship is formulated for the strength prediction of heterogeneous microstructures. The modified relationship is also found to be applicable to data from the literature.

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Section: Definitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Lehto

Remes

Saukkonen

et al. 2014

Materials Science and Engineering: A

193

View full text Add to dashboard Cite

show abstract

“…On the other hand, both the size of grains and the degree of grain size uniformity influence the mechanical properties of polycrystalline materials. Based on the model described in [6], it may be suggested that these differences, in addition to the variation in the properties of the grain boundaries [8], may contribute to the distinctive properties of UHP a-Fe.…”

Section: Discussionmentioning

confidence: 99%

“…It has recently been shown that the properties of polycrystalline materials depend on both the mean grain size and the degree of grain size diversity [6]. In the present work the diversity in the size of grains was measured using the coefficient of variation of grain sections, CV(A).…”

Section: R-rtallizatioomentioning

confidence: 99%