Optimizing strength and ductility of austenitic stainless steels through equal-channel angular pressing and adding nitrogen element

Dong, F.Y.; Zhang, P.; Pang, J.C.; Chen, D.M.; Yang, Ke; Zhang, Z.F.

doi:10.1016/j.msea.2013.08.056

Cited by 35 publications

(12 citation statements)

References 25 publications

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“…The brittle fracture and obvious shrinkage cavities can be seen in figure 4 (c). For the present Zn-40Al/1.0%SiP p and Zn-40Al/1.5% SiP p composites, the slip stress in the interior of grains increases so that the critical shear stress along the localized shear bands is greatly enhanced [22,23].The critical normal stress decreased with the appearance of these pore-and crack-like defects. Accordingly, the ratio of hardness to strength can be affected by the refined structures and the induced porosity through influencing the τ0 and σ 0 .…”

Section: Mechanical Behaviormentioning

confidence: 73%

Microstructure, Mechanical Properties and Wear Behaviour of Semisolid Stir Casting SiC Reinforced Zn-40Al Based Composites

Geng¹,

Wang²,

Xue³

et al. 2018

Int J Metall Mater Eng

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The Zn-40Al composites with various contents of SiC were fabricated by the semi-solid stir casting process. The influence of the SiC on the microstructure, mechanical properties and wear behavior of the composites were investigated. Microstructure analysis shows that the microstructures of as-cast Zn-Al alloys are refined by the addition of SiC. However, with the increase of SiC content, a number of shrinkage porosity occur. The hardness of the composites increases with the increase content of SiC. The tensile strength of the composites declines significantly with the increase content of SiC. The most effective strengthening achieves in Zn-40Al/0.5wt.% SiC, with a maximum increment of 20% in tensile strength compared to non-SiC addition alloy. The overall results reveal that the composites possess similar friction coefficients but the abrasion loss is reduced to less than a tenth after adding 0.5% SiC.

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Section: Mechanical Behaviormentioning

confidence: 73%

Microstructure, Mechanical Properties and Wear Behaviour of Semisolid Stir Casting SiC Reinforced Zn-40Al Based Composites

Geng¹,

Wang²,

Xue³

et al. 2018

Int J Metall Mater Eng

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“…The improved plasticity is ascribed to that the deformation twinning can improve deformation homogeneity due to the enhanced strain-hardening ability, and the twin boundaries can serve as the dislocation slip planes to accommodate plastic strain. Up to now, the existence of SISP has been confirmed in some other alloy systems such as Cu-Zn 18 , stainless steels 27 , which shares the commonality that adding an alloying element to decrease SFE, driving the deformation twinning to dominate plastic deformation.…”

Section: Introductionmentioning

confidence: 80%

“…Through decreasing the SFE of alloys, the planarity of dislocation slipping is enhanced greatly, the deformation mode will be changed from cross slip to planar slip, and even to deformation twinning 20 – 25 . With the decrease of SFE, room-temperature SISP can be produced in the Cu-Zn 18 alloys, Cu-Al alloys 26 and stainless steels 27 . The deformation mechanisms in superalloys may be greatly affected by the intrinsic factors (e.g.…”

Section: Discussionmentioning

confidence: 99%

The synchronous improvement of strength and plasticity (SISP) in new Ni-Co based disc superalloys by controling stacking fault energy

Zhang

et al. 2017

Sci Rep

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It is a great challenge to improve the strength of disc superalloys without great loss of plasticity together since the microstructures benefiting the strength always do not avail the plasticity. Interestingly, this study shows that the trade-off relationship between strength and plasticity can be broken through decreasing stacking fault energy (SFE) in newly developed Ni-Co based disc superalloys. Axial tensile tests in the temperature range of 25 to 725 °C were carried out in these alloys with Co content ranging from 5% to 23% (wt.%). It is found that the ultimate tensile strength (UTS) and uniform elongation (UE) are improved synchronously when microtwinning is activated by decreasing the SFE at 650 and 725 °C. In contrast, only UTS is improved when stacking fault (SF) dominates the plastic deformation at 25 and 400 °C. These results may be helpful for designing advanced disc superalloys with relatively excellent strength and plasticity simultaneously.

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“…The possibility of increasing the mechanical and performance characteristics, including durability under high‐cycle fatigue conditions due to the ultrafine‐grained (UFG) structure in austenitic stainless steels after severe plastic deformation using the equal channel angular pressing (ECAP) was proved (Dobatkin, Rybal'chenko, & Raab, ; Dong et al, ; Huang, Yang, Gao, Wu, & Zhang, ; Ueno, Kakihata, Kaneko, Hashimoto, & Vinogradov, ). Increasing the specific strength of UFG steel at static and cyclic loads will significantly reduce the weight of implanted products in contrast to conventional coarse‐grained steels.…”

Section: Introductionmentioning

confidence: 99%

The influence of ultrafine‐grained structure on the mechanical properties and biocompatibility of austenitic stainless steels

et al. 2019

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In this study, equal‐channel angular pressing (ECAP) of austenitic 316L and Cr–Ni–Ti stainless steels was carried out. Effect of ECAP at 400°C on the evolution of the microstructure, mechanical properties, and biocompatibility of these steels was investigated. The biocompatibility of samples with the ultrafine grain structure obtained in the ECAP process did not deteriorate in comparison with an austenitic 316L stainless steel in coarse‐grained state. However, this treatment enhances the multipotent mesenchymal stromal/stem cell proliferation by 26% for 316L steel and by 17% for Cr–Ni–Ti stainless steel in comparison with coarse‐grained counterparts. At the same time, ECAP contributes to a significant improvement in performance and weight reduction of medical devices, which is especially important for the creation of implanted prostheses for replacement of skeletal defects, due to significant increase in specific strength of steels. The strength properties of austenitic stainless steels were remarkably improved due to the grain refinement and deformation twinning resulted from ECAP at 400°C. After ECAP, the yield strength of 316L and Cr–Ni–Ti stainless steels increased by 4.2 and 2.9 times up to 950 and 900 MPa, and the fatigue limit by 2 and 1.7 times up to 500 and 475 MPa, respectively, comparing to coarse‐grained counterparts.

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Optimizing strength and ductility of austenitic stainless steels through equal-channel angular pressing and adding nitrogen element

Cited by 35 publications

References 25 publications

Microstructure, Mechanical Properties and Wear Behaviour of Semisolid Stir Casting SiC Reinforced Zn-40Al Based Composites

Microstructure, Mechanical Properties and Wear Behaviour of Semisolid Stir Casting SiC Reinforced Zn-40Al Based Composites

The synchronous improvement of strength and plasticity (SISP) in new Ni-Co based disc superalloys by controling stacking fault energy

The influence of ultrafine‐grained structure on the mechanical properties and biocompatibility of austenitic stainless steels

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