Effect of Cold Deformation on Microstructure and Mechanical Properties of a Fe–20Mn–19Cr–0.5C–0.6N High Nitrogen Austenitic Steel

Peng, Mengdu; Shi, Jie; Cui, Bing; Sun, Tao; Li, Xiaoyuan; Wang, Maoqiu

doi:10.1002/srin.201700069

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…As already stated, only very small fractions of epsilon‐martensite, which is nonmagnetic as well, were found . Similar observations concerning deformation mechanisms were reported more recently from investigations of a comparable alloying system . In addition, fatigue resistance of high‐interstitial austenitic stainless steels has been shown to be improved compared with conventional FeCrNi austenites .…”

Section: Resultssupporting

confidence: 85%

Profile Cross Rolling of High‐Interstitial Austenitic Stainless Steels for Application in Plastics Extrusion

Forke

Niederhofer²,

Albrecht

et al. 2019

steel research int.

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FeCrMnCN stainless austenitic high-interstitial steels (HIS) combine the properties of conventional FeCrNi austenites (superior ductility and surface corrosion resistance) with the potential of significant strengthening. This combination of properties makes them promising candidates for environments that require resistance to both wear and corrosion, e.g., processing of plastics. The aim herein is to make use of the high work-hardening ability of HIS. Thus, machined preforms with an application-related design are formed by profile cross rolling. The preform design enables a hardness increase in component regions that are most subjected to wear. Rolling of the specimens results in a very high surface quality with a roughness Rz in the range of 1 μm. Hardness measurements in rolled specimens confirm a significant hardness increase in the subsurface up to a depth of %2.5 mm. Hardness values of about 600 HV1 are yielded within a surface distance of %0.3 mm. Furthermore, tests on a modified pin-on-disc tribometer suggest that the wear behavior of the work-hardened HIS is comparable with nitriding steel. Thus, the results of this study support the development of a forming technology for screws in corrosive environments.

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Section: Resultssupporting

confidence: 85%

Profile Cross Rolling of High‐Interstitial Austenitic Stainless Steels for Application in Plastics Extrusion

Forke

Niederhofer²,

Albrecht

et al. 2019

steel research int.

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“…Under large strain, the specimen undergoes significant lattice distortion due to the accumulation of a large number of lattice defects, leading to the destruction of the quality of the Kikuchi diffraction pattern [ 23 ], which has been discussed above. The gray area is the zero pixels point in the maps, which can be considered as lattice distortions occurring within the specimen, especially around the GBs, resulting from the high-stress concentration under cold deformation [ 24 ]. As shown in Figure 4 a–d, the gray area that cannot be indexed gradually increases with increasing strain.…”

Section: Resultsmentioning

confidence: 99%

In Situ Study of the Microstructural Evolution of Nickel-Based Alloy with High Proportional Twin Boundaries Obtained by High-Temperature Annealing

Zhang

Sun

et al. 2023

Materials

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In this paper, we report an in situ study regarding the microstructural evolution of a Cr20Ni80 alloy with high proportional twin boundaries by using electron backscatter diffraction techniques combined with the uniaxial tensile test. The study mainly focuses on the evolution of substructure, geometrically necessary dislocation, multiple types of grain boundaries (especially twin boundaries), and grain orientation. The results show that the Cr20Ni80 alloy can be obtained with up to 73% twin boundaries by annealing at 1100 °C for 30 min. During this deformation, dislocations preferentially accumulate near the twin boundary, and the strain also localizes at the twin boundary. With the increasing strain, dislocation interaction with grain boundaries leads to a decreasing trend of twin boundaries. However, when the strain is 0.024, the twin boundary is found to increase slightly. Meanwhile, the grain orientation gradually rotates to a stable direction and forms a Copper, S texture, and α-fiber <110>. Above all, during this deformation process, the alloy is deformed mainly by two deformation mechanisms: mechanical twinning and dislocation slip.

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“…Figure 8(c) shows twins with a thickness of 50-100 nm surrounded by a large number of dislocations. The twin thickness and twin spacing are almost the same, indicating that the twins after expansion have more integrals, higher dislocation density, and stronger strengthening effects of dislocations and twins [19].…”

Section: Microstructurementioning

confidence: 88%

Microstructure analysis and crack nucleation in TWIP steel tube at expansive deformation

Liu

Song

et al. 2021

Mater. Res. Express

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The expansion test of twinning induced plastic (TWIP) steel tube was carried out at room temperature. Cracks appeared inside the tube edge when TWIP steel tube expands by 15.6%. The microstructure evolution, deformation mechanism and crack generation of TWIP steel after expansion were investigated by XDR OM TEM and EBSD. The results show that TWIP steel tube still austenite phase after expansion at room temperature; a great deal of dislocations are gathered around the grain boundaries and twin boundaries, the integral number of twins is high, and the mechanism of expansion deformation is the joint action of dislocations slip and deformation twins; Twins produce a large number of finer secondary or even multiple twins, intersecting each other; After expansion, the silk texture with direction of <111>∥X0 dominated by rotating brass texture {110}<111> is gradually produced through grain deformation and rotation; The proportion of small angle grain boundaries increased greatly; It is deduced that the criterion of crack nucleation is based on the difference between the dislocation pile-up energy (DPE) and the crack nucleation energy (CNE), and the expansion deformation process of TWIP steel satisfies the condition of crack nucleation.

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Effect of Cold Deformation on Microstructure and Mechanical Properties of a Fe–20Mn–19Cr–0.5C–0.6N High Nitrogen Austenitic Steel

Cited by 7 publications

References 22 publications

Profile Cross Rolling of High‐Interstitial Austenitic Stainless Steels for Application in Plastics Extrusion

Profile Cross Rolling of High‐Interstitial Austenitic Stainless Steels for Application in Plastics Extrusion

In Situ Study of the Microstructural Evolution of Nickel-Based Alloy with High Proportional Twin Boundaries Obtained by High-Temperature Annealing

Microstructure analysis and crack nucleation in TWIP steel tube at expansive deformation

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