Microstructural characteristics and strengthening mechanisms in a polycrystalline Ni-based superalloy under deep cold rolling

Kumar, Dharmesh; Idapalapati, Sridhar; Wang, Wei; Bhowmik, Ayan

doi:10.1016/j.msea.2019.03.005

Cited by 19 publications

(12 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These effects increased with the number of moves of the instrument. Similar effects were obtained in [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionsupporting

confidence: 72%

“…In [14] the subtle physical methods of researches it is established some regularities occurring in the surface layer in the processing of surface plastic deformation tungsten ball (ø 6 mm) and the mechanism of hardening. The presence of large values of residual stresses (866-1315 MPa) the authors associated with the formation of metal ahead of the roller instrument atomic rearrangement of the metal particles through the mechanism of "clutter".…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Study of Multiradius Roller Running Process

Krechetov

Mitrofanova

2019

MATEC Web Conf.

View full text Add to dashboard Cite

The results of theoretical and experimental studies of the surface of the sample of steel 45 after surface plastic deformation (SPD) with multi-radius roller (MR-roller) is shown. The goal of this study is to expand the technological capabilities of the method of SPD through the use of a new design of the deforming tool developed at the Department of Engineering Technology of KuzSTU. The advantage of the MR-roller (Patent RU № 2557377) over the traditional tool for SPD (single-radius roller) is the possibility of creating a large hydrostatic pressure in the deformation zone, without destroying the surface layer of the processed material. The research technique included finite element modeling (FEM), microhardness measurement, metallographic studies of the sample structure. As a result of the study, some regularities of the process of hardening by a multi-radius tool with high hydrostatic pressure and a large number of quasi-monotonic deformation sites were revealed. The results indicate a significant hardening without metal destruction and the formation of nanoscale grains, which allows to improve the properties of rolled products in the application of high operating loads.

show abstract

“…These effects increased with the number of moves of the instrument. Similar effects were obtained in [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

The Study of Multiradius Roller Running Process

Krechetov

Mitrofanova

2019

MATEC Web Conf.

View full text Add to dashboard Cite

show abstract

“…The residual stress completely relaxed at 450 °C thermal exposure, but the benefit of the surface treatment was due to the generation of work hardening layer and nanocrystalline layer formation on the subsurface that impeded the driving force for fatigue failure. Recently, Kumar et al [22] and Nagarajan et al [196,197] presented the residual stress distribution, microstructural evolution, and proposed deformation and strengthening mechanisms induced during deep cold rolling of nickel-based superalloy Udimet 720Li under different hydrostatic pressure levels (10–50 MPa). Deformation induced defects, such as dislocation cells, shear bands, and their interactions, were observed during the DCR process, as presented in Figure 21.…”

Section: Surface Modification Techniquesmentioning

confidence: 99%

“…The DCR treatment is another alternative process that could achieve both CRS and deep penetration depth [18]. The strengthening and deformation mechanisms in the nickel-based superalloy, Udimet720Li, during deep cold rolling process were proposed in our previous study [22]. The existing limitations of these processes, such as inaccessibility to treat complex geometries and rough surface finish, always motivate industries to develop new processes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys

et al. 2019

Self Cite

View full text Add to dashboard Cite

Fatigue is a dominant failure mechanism of several engineering components. One technique for increasing the fatigue life is by inducing surface residual stress to inhibit crack initiation. In this review, a microstructural study under various bulk (such as severe plastic deformation) and surface mechanical treatments is detailed. The effect of individual microstructural feature, residual stress, and strain hardening on mechanical properties and fatigue crack mechanisms are discussed in detail with a focus on nickel-based superalloys. Attention is given to the gradient microstructure and interface boundary behavior for the mechanical performance. It is recommended that hybrid processes, such as shot peening (SP) followed by deep cold rolling (DCR), could enhance fatigue life. The technical and scientific understanding of microstructural features delineated here could be useful for developing materials for fatigue performance.

show abstract

“…One of the MSE methods, deep cold rolling (DCR), is getting attention nowadays as it is a fast, chipless, and economical surface enhancement method applicable to prevailing conventional or computer numerical control (CNC) machine tools. Further producing a deep layer of compression and nanocrystalline microstructure on the surface of samples, it also can lessen the surface roughness of materials and enhance the fatigue life of engineering components without affecting their bulk properties (Ref [22][23][24][25][26][27][28][29][30][31][32][33][34]. There are numerous parameters to be considered, and the effects of each of these parameters are dependent on other variables.…”

Section: Introductionmentioning

confidence: 99%

Surface Properties and Corrosion Behavior of Turn-Assisted Deep-Cold-Rolled AISI 4140 Steel

Prabhu

Sharma

et al. 2020

J. of Materi Eng and Perform

View full text Add to dashboard Cite

In this research, the effect of various turn-assisted deep-cold-rolling process parameters on the residual stress, microstructure, surface hardness, surface finish, and corrosion behavior of AISI 4140 steel has been investigated. The examination of the surface morphology of the turned and processed samples was performed by using a scanning electron microscope, energy-dispersive spectroscopy, and atomic force microscopy. Response surface methodology and desirability function approach were used for reducing the number of experiments and finding local optimized conditions for parameters under the study. The results from the residual stress measurements indicate that the rolling force has the highest effect by generating a deeper layer of residual compressive stress. The outcomes of surface hardness and surface finish emphasize that rolling force and number of tool passes are the most significant parameters affecting the responses. Surface studies confirmed the corrosion and its intensity onto the metal surface, and according to atomic force microscopy studies, the surface had become remarkably rough after exposure to the corrosive medium. Improvements in surface microhardness from 225 to 305.8 HV, the surface finish from 4.84 down to 0.261 μm, and corrosion rate from 6.672 down to 3.516 mpy are observed for a specific set of parameters by turn-assisted deep-cold-rolling process. The multiresponse optimization for surface finish and corrosion rate together shows that a ball diameter of 10 mm, a rolling force of 325.75 N, initial roughness of 4.84 µm, and number of tool passes of 3 give better values for the two responses under consideration with composite desirability of 0.9939. Based on the experimental work at the optimum parameter setting, the absolute average error between the experimental and predicted values for the corrosion rate is calculated as 3.2%.

show abstract

Microstructural characteristics and strengthening mechanisms in a polycrystalline Ni-based superalloy under deep cold rolling

Cited by 19 publications

References 44 publications

The Study of Multiradius Roller Running Process

The Study of Multiradius Roller Running Process

Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys

Surface Properties and Corrosion Behavior of Turn-Assisted Deep-Cold-Rolled AISI 4140 Steel

Contact Info

Product

Resources

About