Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

Dong, F.Y.; Zhang, P.; Pang, J.C.; Ren, Yujie; Yang, Kai; Zhang, Z.F.

doi:10.1016/j.scriptamat.2014.09.016

Cited by 45 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…The high nitrogen austenitic stainless steel, having good mechanical properties and excellent corrosion resistance and non-magnetism and bio-compatibility, has been widely applied in high-tech industry and medical materials [1][2][3][4][5][6][7][8][9][10] in recent years. Nitrogen is beneficial to enlarging austenite region, raising austenitic stability, enhancing ultimate tensile strength and yield strength without loss of toughness and ductility, and increasing corrosion resistance and oxidation resistance [11][12][13], so, nitrogen as a beneficial element plays a very important role in stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Thermal deformation behavior and processing maps of nickel-free high nitrogen austenitic Cr18Mn16Mo2.5N0.83Nb0.15 stainless steel

Liu

Wang²,

Yang³

et al. 2022

Mater. Res. Express

View full text Add to dashboard Cite

The nickel-free high nitrogen austenitic Cr18Mn16Mo2.5N0.83Nb0.15 stainless steel was fabricated by electroslag remelting technology. The high-temperature thermal deformation behavior of as-fabricated steel was investigated using Gleeble-1500D type thermal-mechanical simulation testing machine under the condition of the temperature range from 950℃ to 1100℃ and the strain-rate range from 0.01s-1 to 1.0s-1. The constitutive equation containing polynomial of as-fabricated steel was built to describe stress function containing the variable of deformation temperature and strain-rate based on Arrhenius equation. The Q value is 448.915 kJ/mol by computing using the experimental data obtained from the thermal deformation tests. The thermal forging temperature should be higher than 1050 ℃ and the strain-rate below 1s-1 based on the thermal processing maps.

show abstract

“…Efforts in exploring ultrahigh-carbon (with C > 1.0 wt.%) steels as potential structural materials have led to some progress in non-martensitic steels and composites 10 , 11 , but they are not comparable with super-high-strength steels. On the other hand, medium-strength non-martensitic steels can be work-hardened to possess ultrahigh-strengthen and significant ductility by various methods such as tempforming (TF) 12 , high-pressure torsion (HPT) 13 and heavy cold-drawing (e.g., piano wires can exhibits a record-high strength of 6 GPa) 14 , 15 ; but the high-strength is restricted to small-dimensions like thin plate or wire. It is desired that an inexpensive ultrahigh-strength steel solution can be discovered not through processing the steels into small dimensions, so that a large degree of freedom in size and in shape can be endowed to the end products.…”

Section: Introductionmentioning

confidence: 99%

Super-strong dislocation-structured high-carbon martensite steel

Sun

Liu

Zhu

et al. 2017

Sci Rep

View full text Add to dashboard Cite

High-carbon martensite steels (with C > 0.5 wt.%) are very hard but at the same time as brittle as glass in as-quenched or low-temperature-tempered state. Such extreme brittleness, originating from a twin microstructure, has rendered these steels almost useless in martensite state. Therefore, for more than a century it has been a common knowledge that high-carbon martensitic steels are intrinsically brittle and thus are not expected to find any application in harsh loading conditions. Here we report that these brittle steels can be transformed into super-strong ones exhibiting a combination of ultrahigh strength and significant toughness, through a simple grain-refinement treatment, which refines the grain size to ~4 μm. As a result, an ultra-high tensile strength of 2.4~2.6 GPa, a significant elongation of 4~10% and a good fracture toughness (K1C) of 23.5~29.6 MPa m1/2 were obtained in high-carbon martensitic steels with 0.61–0.65 wt.% C. These properties are comparable with those of “the king of super-high-strength steels”—maraging steels, but achieved at merely 1/30~1/50 of the price. The drastic enhancement in mechanical properties is found to arise from a transition from the conventional twin microstructure to a dislocation one by grain refinement. Our finding may provide a new route to manufacturing super-strong steels in a simple and economic way.

show abstract

Strength, damage and fracture behaviors of high-nitrogen austenitic stainless steel processed by high-pressure torsion

Cited by 45 publications

References 33 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

Thermal deformation behavior and processing maps of nickel-free high nitrogen austenitic Cr18Mn16Mo2.5N0.83Nb0.15 stainless steel

Super-strong dislocation-structured high-carbon martensite steel

Contact Info

Product

Resources

About