Evolution of residual stress, microstructure and cyclic performance of the equiatomic high-entropy alloy CoCrFeMnNi after deep rolling

Oevermann, Torben; Wegener, Thomas; Liehr, A.; Hübner, L.; Niendorf, Thoralf

doi:10.1016/j.ijfatigue.2021.106513

Cited by 20 publications

(8 citation statements)

References 41 publications

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“…There is a difference in surface hardness up to 500 µm below the surface. Studies on deep rolling show that the depth of the affected area varies between 500 µm to -1 µm [13], [16] and [20]. This depth varies according to material type, process parameters and application environment (cryogenic, etc.…”

Section: Microhardnessmentioning

confidence: 99%

“…As a result of this surface pressure, residual tensions and micro structural deformations (hardening/ softening) occur since the yield force of the material is exceeded [8], [9], and [6]. Studies about deep rolling are still continuing in various ways, such as simulation works about deep rolling [10], deep rolling analysis through finite elements method [11], and [12], trials of deep rolling in different work conditions (for example: cryogenic) [13], and deep rolling analysis through regression methods etc.. It is seen that hardness, corrosion resistance and fatigue life have been obtained as a result of press residual stress formed on the surfaces by deep rolling [14].…”

Section: Introductionmentioning

confidence: 99%

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Investigation on the Application of Worn Cutting Tool Inserts as Burnishing Tools

Adıyaman

2024

sv-jme

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The amount of wear in cutting tools used in all machining processes is around 1 % to 2 % evaluation of the non-wearing areas of the inserts is economically beneficial. This study aims to test the usability of the non-wearing regions of the waste tungsten carbide (WC), cubic boron nitride (CBN) and ceramic inserts as a rolling tool in the deep rolling method and to observe their performance. The turned workpieces were deep rolled with three different types of waste-cutting tools (WC, CBN and ceramic) in different machining parameters (rolling force, number of passes, and feed rate). As a result, surface roughness and microhardness values obtained in deep rolling operations with these inserts were similar to those in deep rolling operations with other rolling tools. It has been determined that ceramic inserts perform better in deep rolling processes in terms of microhardness, and WC inserts perform better in terms of surface roughness. Thus, it has been determined that waste WC, CBN and ceramic inserts can be used in the deep rolling method.

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Section: Microhardnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation on the Application of Worn Cutting Tool Inserts as Burnishing Tools

Adıyaman

2024

sv-jme

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“…Saalfeld et al [19] used another type of surface rolling tool to treat test specimens and added an induction heater to heat the specimens while performing the rolling process. Oevermann et al [20] used the same surface rolling tool as Saalfeld et al [19] but applied liquid nitrogen to maintain cryogenic conditions while treating test specimens. For non-symmetrical workpieces, the material can still be treated with surface rolling by using a moveable ball or roller to press against the treated surface [21].…”

Section: Smrtmentioning

confidence: 99%

Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

Chen

Xue

2022

Metals

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This paper aims to provide a better understanding regarding the effects of shot peening (SP), surface mechanical attrition treatment (SMAT), laser shock peening (LSP), surface mechanical rolling treatment (SMRT), and ultrasonic nanocrystal surface modification (UNSM) on the fatigue properties of metals in high-cycle fatigue (HCF) and very-high-cycle fatigue (VHCF) regimes. The work in this paper finds that SMRT and UNSM generally improve the high-cycle and very-high-cycle fatigue properties of metals, while SP, SMAT, and LSP can have mixed effects. The differences are discussed and analyzed with respect to the aspects of surface finish, microstructure and microhardness, and residual stress. SMRT and UNSM generally produce a smooth surface finish, while SP and SMAT tend to worsen the surface finish on metals, which is harmful to their fatigue properties. In addition to inducing a plastic deformation zone and increasing microhardness, surface treatments can also generate a nanograin layer and gradient microstructure to enhance the fatigue properties of metals. The distribution of treatment-induced residual stress and residual stress relaxation can cause mixed effects on the fatigue properties of metals. Furthermore, increasing residual stress through SP and SMAT can cause further deterioration of the surface finish, which is detrimental to the fatigue properties of metals.

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“…Mechanical surface treatment processes are well-known for establishing near-surface layers of a component that are characterized by high compressive residual stresses, increased hardness due to strain hardening and a smooth surface appearance, depending on the respective treatment process used [40,[42][43][44]. Furthermore, deformation-induced twinning or phase transformation, exemplarily shown in [39,[45][46][47], can be obtained as a result of high plastic deformation. In particular, residual stresses are of paramount importance for the service life of structural components.…”

Section: Introductionmentioning

confidence: 99%

“…As a result of the pronounced work-hardening ability detailed above, HMnS are suitable candidate materials for mechanical surface treatment processes. However, only a few studies investigating the effect of mechanical surface treatments and, thus, the effect of residual stresses, hardness and roughness on the SI of HMnS TWIP and TRIP steels, can be found in the literature [47,[55][56][57]. In a previous study, the evolution of residual stresses, microstructure and cyclic performance of the X40MnCrAl19-2 TWIP steel after deep rolling at RT, −196 and 200 • C, was investigated by the authors' group [39].…”

Section: Introductionmentioning

confidence: 99%

Consequences of Deep Rolling at Elevated Temperature on Near-Surface and Fatigue Properties of High-Manganese TWIP Steel X40MnCrAl19-2

et al. 2021

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Due to pronounced work-hardening induced by the complex interplay of deformation mechanisms such as dislocation slip, twinning and/or martensitic phase transformation, high-manganese steels represent a class of materials well-suited for mechanical surface treatment. In the present study, the fatigue behavior of a high-mangsanese steel showing twinning-induced plasticity (TWIP) effect at room temperature (RT) was investigated after deep rolling at 550 °C. Results are compared to a former study discussing the behavior after RT deep rolling. Evolution of the near-surface microstructure was analyzed by scanning electron microscopy (SEM), microhardness measurements and residual stress depth profiles obtained by X-ray diffraction (XRD). Both uniaxial tensile tests and uniaxial tension-compression fatigue tests have been conducted in order to rationalize the macroscopic material behavior. Following deep rolling at 550 °C, SEM measurements employing electron backscatter diffraction (EBSD) revealed a heavily deformed surface layer as well as localized deformation twinning. Specimens showed inferior hardness and residual stress depth profiles when compared to RT deep rolled counterparts. Tensile tests indicated no difference between the conditions considered. Fatigue properties however were improved. Such behavior is rationalized by a more stable residual stress state induced by dynamic strain aging.

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Evolution of residual stress, microstructure and cyclic performance of the equiatomic high-entropy alloy CoCrFeMnNi after deep rolling

Cited by 20 publications

References 41 publications

Investigation on the Application of Worn Cutting Tool Inserts as Burnishing Tools

Investigation on the Application of Worn Cutting Tool Inserts as Burnishing Tools

Comparison of SP, SMAT, SMRT, LSP, and UNSM Based on Treatment Effects on the Fatigue Properties of Metals in the HCF and VHCF Regimes

Consequences of Deep Rolling at Elevated Temperature on Near-Surface and Fatigue Properties of High-Manganese TWIP Steel X40MnCrAl19-2

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