Yielding behavior and its effect on uniform elongation in IF steel with various grain sizes

Gao, Si; Chen, Meichuan; Joshi, Mohit; Shibata, Akinobu; Tsuji, Nobuhiro

doi:10.1007/s10853-014-8233-0

Cited by 56 publications

(29 citation statements)

References 15 publications

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“…The increase of grain size from 0.1 to 0.4 μm significantly lowers the yield strength from 1.3 GPa to 738 MPa. However, there is an abrupt increase of ductility at this grain-size scale, which is much finer than the scale where a similar transition is reported for a number of single phase metals [33][34][35][36][37], which is usually above 1 μm. The unique deformation characteristics of the duplex structure and TRIP effect are responsible for the observed high ductility.…”

Section: Resultssupporting

confidence: 62%

“…It is also noted that the alloy sample with a grain size of about 0.4 µm shows a discontinuous yielding characterized by a yield point phenomenon and a Lüders elongation, instead of the continuous yielding in the CG samples. This has been usually observed in single phase metals such as Al [33], IF steel [37], and austenitic steel [44]. The discontinuous yielding behavior corresponds to a steep drop followed by a rapid upturn of strain hardening rate, which can be attributed to the lack of initial mobile dislocations and sudden multiplication of mobile dislocations [45].…”

Section: Resultsmentioning

confidence: 73%

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Grain Size Effect on the Mechanical Behavior of Metastable Fe-23Cr-8.5Ni Alloy

Xie

Wang

et al. 2019

Metals

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An Fe-23Cr-8.5Ni alloy was used as a model material to study the grain size effect on the mechanical behavior of metastable duplex metal. Alloy samples with different grain sizes ranging from 0.1 to 2 μm were prepared by cold-rolling and annealing. A structural refinement to about 0.1 μm results in a high yield strength but very limited ductility. A significant improvement of ductility occurred at the grain size of about 0.4 μm. A further increase in grain size results in a decreased strength and a slightly improved ductility. The alloy with a grain size of about 0.4 μm exhibits an excellent combination of strength and ductility, where the yield strength and tensile elongation are increased up to 738 MPa and 29% as compared to 320 MPa and 33% of a coarse-grained (about 2 μm) sample, respectively. The origin of the excellent mechanical properties was attributed to the unique deformation characteristics associated with the transformation induced plasticity and the development of back stress.

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Section: Resultssupporting

confidence: 62%

Section: Resultsmentioning

confidence: 73%

Grain Size Effect on the Mechanical Behavior of Metastable Fe-23Cr-8.5Ni Alloy

Xie

Wang

et al. 2019

Metals

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“…In addition, the enameled heat sink is also operated continuously under elevated‐temperature environment (200–300 °C) in the nuclear power station. Therefore, research on the effect of crystallization temperature on the microstructures and mechanical properties of enamel substrate is an important piece of engineering research for the processing technology of enameled substrate …”

Section: Introductionmentioning

confidence: 99%

Effect of Crystallization Temperature on the Microstructures and Mechanical Properties of Enamel Substrate RT330

Tao

Yan

et al. 2016

Adv Eng Mater

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The experimental crystallization simulates the manufacturing process of the heat sink in a heat exchanger used in nuclear power stations. The effect of the temperature of crystallization on the microstructures and mechanical properties of enamel substrate RT330 was investigated using an optical microscope, scanning electron microscope, transmission electron microscope and others. The experiment demonstrates that second-phase particles generated at the bottom of dimples enhance the RT330 mechanical properties. Due to the interaction between the precipitation and the solid solution, the density of precipitations (TiN and TiC) reaches the maximum when crystallization treatment is at 850 C.

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“…When the grain size is further decreased, a sharp transition of the ductility may occur. [1,30,31] Take interstitial free steel as an example, when the mean grain size is 0.95 μm, a promising UE of 0.11 is obtained, but early plastic instability occurs when the grain size is further decreased to 0.85 μm, resulting in a drastic decrease of UE to 0.01. [31] However, it is reported that in Cu-Zn alloys with ultrafine-grained or nanocrystallized structures after high-pressure torsion processing, there exists an optimal medium SFE yielding the best ductility, which is consistent with the present results in the fine-grained regime.…”

mentioning

confidence: 99%

“…[1,30,31] Take interstitial free steel as an example, when the mean grain size is 0.95 μm, a promising UE of 0.11 is obtained, but early plastic instability occurs when the grain size is further decreased to 0.85 μm, resulting in a drastic decrease of UE to 0.01. [31] However, it is reported that in Cu-Zn alloys with ultrafine-grained or nanocrystallized structures after high-pressure torsion processing, there exists an optimal medium SFE yielding the best ductility, which is consistent with the present results in the fine-grained regime. [3] In this study, finegrained Cu-Al alloys are analyzed only when the grain size falls into the range of 0.5-3.5 μm since the ductility will be negligible when the grain size is smaller than about 0.5 μm [15,22,25,30] in contrast to the annealed counterparts.…”

mentioning

confidence: 99%