Comparison of TiN-coated tools using CVD and PVD processes during continuous cutting of Ni-based superalloys

Koseki, Shuho; Inoue, Kenji; Morito, Shigekazu; Ohba, Takayoshi; Usuki, Hiroshi

doi:10.1016/j.surfcoat.2015.10.071

Cited by 53 publications

(22 citation statements)

References 39 publications

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“…Transition metal nitrides have gained considerable interest due to their excellent mechanical properties, thermal stability, and corrosion resistance, [1][2][3][4][5][6][7][8][9] and are widely used as hard wear-resistant coatings, diffusion barriers, and protective decorative coatings. 2,3,6,[8][9][10][11][12][13] While TiN is the most studied transition metal nitride and is used in all of the above applications, WN is relatively unexplored and its processing-structure-property relationships as well as its phase stability is not fully established yet.…”

Section: Introductionmentioning

confidence: 99%

“…2,3,6,[8][9][10][11][12][13] While TiN is the most studied transition metal nitride and is used in all of the above applications, WN is relatively unexplored and its processing-structure-property relationships as well as its phase stability is not fully established yet. WN has potentially promising properties as its six valence electrons result in a high valence electron density with 3 electrons per formula unit occupying metal d-bands.…”

Section: Introductionmentioning

confidence: 99%

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Vacancy-induced mechanical stabilization of cubic tungsten nitride

2016

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First-principles methods are employed to determine the structural, mechanical and thermodynamic reasons for the experimentally reported cubic WN phase. The defect-free rocksalt phase is both mechanically and thermodynamically unstable, with a negative single crystal shear modulus C 44 = -86 GPa and a positive enthalpy of formation per formula unit H f = 0.623 eV with respect to molecular nitrogen and metallic W. In contrast, WN in the NbO phase is stable, with C 44 = 175 GPa and H f = -0.839 eV. A charge distribution analysis reveals that the application of shear strain along [100] in rocksalt WN results in an increased overlap of the t 2g orbitals which causes electron migration from the expanded to the shortened W-W <110> bond axes, yielding a negative shear modulus due to an energy reduction associated with new bonding states 8.1-8.7 eV below the Fermi-level. A corresponding shear strain in WN in the NbO-phase results in an energy increase and a positive shear modulus. The mechanical stability transition from the NaCl to the NbO phase is explored using supercell calculations of the NaCl structure containing C v = 0-25% cation and anion vacancies, while keeping the N-to-W ratio constant at unity. The structure is mechanically unstable for C v < 5%. At this critical vacancy concentration, the isotropic elastic modulus E of cubic WN is zero, but increases steeply to E = 445 GPa for C v = 10%, and then less steeply to E = 561 GPa for C v = 25%. Correspondingly, the hardness estimated using Tian's model increases from 0 to 15 to 26 GPa as C v increases from 5% to 10% to 25%, indicating that a relatively small vacancy concentration stabilizes the cubic WN phase and that the large variations in reported mechanical properties of WN can be attributed to relatively small changes in C v .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vacancy-induced mechanical stabilization of cubic tungsten nitride

2016

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“…Still regarding the comparison between CVD-and PVD-coated tools, the study performed by Koseki et al [50] compares TiN-coated tools obtained by different deposition methods in the continuous turning of Ni-based super-alloys. These high-strength, low-conducting alloys require higher cutting forces and temperatures than other materials during the machining process.…”

Section: Coatings For Turning Toolsmentioning

confidence: 99%

“…In a work mentioned in the previous chapter [50], there is a study on the wear of TiN coatings obtained by different deposition methods. In addition to abrasive wear and fracture wear, a common wear mechanism is adhesive wear, where the material adheres to the coated tool.…”

Section: Tool Wear Mechanismsmentioning

confidence: 99%

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Recent Advances in Turning Processes Using Coated Tools—A Comprehensive Review

Sousa

Silva

2020

Metals

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Turning continues to be the largest segment of the machining industry, which highlights the continued demand for turned parts and the overall improvement of the process. The turning process has seen quite an evolution, from basic lathes using solid tools, to complex CNC (Computer Numerical Control) multi-process machines, using, for the most part, coated inserts and coated tools. These coatings have proven to be a significant step in the production of high-quality parts and a higher tool life that have captivated the industry. Continuous improvement to turning coated tools has been made, with many researches focusing on the optimization of turning processes that use coated tools. In the present paper, a presentation of various recently published papers on this subject is going to be made, mentioning the various types of coatings that have recently been used in the turning process, the turning of hard to machine materials, such as titanium alloys and Inconel, as well as the interaction of these coatings with the turned surfaces, the wear patterns that these coatings suffer during the turning of materials and relating these wear mechanisms to the coated tool’s life expectancy. Some lubrication conditions present a more sustainable alternative to current methods used in the turning process; the employment of coated tool inserts under these conditions is a current popular research topic, as there is a focus on opting for more eco-friendly machining options.

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A review on cutting tool technology in machining of Ni-based superalloys

Fan

Wang

et al. 2020

Int J Adv Manuf Technol

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In this paper, a state-of-the-art review on cutting tool technology in machining of Ni-based superalloys is presented to better understand the current status and to identify future directions of research and development of cutting tool technologies. First, past review articles related to the machining of Ni-based superalloys are summarized. Then machinability of superalloys is introduced, together with the reported methods used in cutting tool design. The current researches on cutting tools in the machining of superalloys are presented in different categories in terms of tool materials, i.e., carbide, ceramics, and Polycrystalline cubic boron nitride (PCBN). Moreover, a set of research issues are identified and highlighted to improve the machining of superalloys. Finally, discussions on the future development are presented, in the areas of new materials/geometries, functional surfaces on the cutting tool, and data-driven comprehensive optimization.

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Comparison of TiN-coated tools using CVD and PVD processes during continuous cutting of Ni-based superalloys

Cited by 53 publications

References 39 publications

Vacancy-induced mechanical stabilization of cubic tungsten nitride

Vacancy-induced mechanical stabilization of cubic tungsten nitride

Recent Advances in Turning Processes Using Coated Tools—A Comprehensive Review

A review on cutting tool technology in machining of Ni-based superalloys

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