Experimental Research on the Electrochemical Machinability of selected γ-TiAl alloys for the Manufacture of Future Aero Engine Components

Klocke, Fritz; Herrig, T.; Zeis, Markus; Klink, Andreas

doi:10.1016/j.procir.2015.08.050

Cited by 36 publications

(11 citation statements)

References 11 publications

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“…The TiAl matrix composites have attracted great attention due to their excellent properties, such as low density (3.85-4.2 g/cm 3 ) [1], high speci c strength [2], high oxidation resistance [3],and high temperature creep resistance [4]. They are widely used in the elds of aeroengine technology [5], automotive turbochargers [6], and marine ship plates [7]. Many methods are currently used to prepare TiAl matrix composites, including electron beam casting [8], self-propagating high-temperature synthesis [9], hotpressing sintering [10], and spark plasma sintering (SPS) [11].…”

Section: Introductionmentioning

confidence: 99%

Eﬀect of Ti3SiC2 Amount on Microstructure and Properties of TiAl Matrix Composites

Zou

Lou

Guan

et al. 2021

Preprint

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The TiAl matrix composites were manufactured using spark plasma sintering under the conditions of 1100 °C/10 min/30 MPa. The effect of Ti3SiC2 amount on microstructure and properties of TiAl matrix composites was investigated. Ti3SiC2 was homogeneously distributed in the TiAl matrix, and it partly decomposed to form Ti5Si3 and TiC. The TiAl matrix with 30 wt.% of Ti3SiC2 exhibited the lowest friction coeﬃcient and wear rate of 0.507 and 1.35´10-4 mm3N-1m-1 at room temperature and 0.423 and 0.21´10-4 mm3N-1m-1 at 550 °C, while the compression strength reached the maximum value of 1080 GPa at room temperature and 640 GPa at 550 °C, respectively. The hardness reached the value of 5.1 GPa. The TiAl matrix composites had a lower friction coefficient and wear rate at 550 °C than at room temperature. A Ti3SiC2 lubricating ﬁlm was formed on the friction surface of the TiAl matrix composites after friction test at room temperature, while a Fe-Ti-Al-Si-oxide lubricating ﬁlm was formed after friction test at 550 °C. The wear mechanisms of the TiAl matrix composites with the Ti3SiC2 addition were mainly abrasive wear and adhesive wear at room temperature and 550 °C, respectively.

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Section: Introductionmentioning

confidence: 99%

Eﬀect of Ti3SiC2 Amount on Microstructure and Properties of TiAl Matrix Composites

Zou

Lou

Guan

et al. 2021

Preprint

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“…The selection of optimum cutting parameters (cutting speed, feed rate, tool geometry, etc.) is also essential to control the tool-chip interaction consistently with a high material strain rate [20,21]. Different constitutive material damage models have been reported in the literature, such as Oxley's constitutive model [22], the power law model [23], the strain pathdependent model [24], and the Johnson-Cook (JC) model [25].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and simulation of macro- to microscale chip considering size effect for optimum milling characteristics of AA2024T351

Saleem

Ijaz

Al‐Zahrani

et al. 2019

J Braz. Soc. Mech. Sci. Eng.

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This research work deals with the numerical modeling and analysis of macro-to microscaled milling of a strain rate-sensitive alloy AA2024T351. The milling computations of a semicircular slot are performed in Abaqus/Explicit by employing the Johnson-Cook thermo-elasto viscoplastic material damage model. The Coulomb friction model is applied at the contact interfaces of work piece and cutting tool. Due to the simultaneous effect of cutting feed and angular speed (ω r), the geometry of uncut chip is modeled with variable section thickness to adapt the trochoidal path. The configuration of the uncut chip undertakes the macro-to micromilling effect. This research effort uniquely explains a comprehensive modeling and milling computations at macro-to microscales to identify the imperative milling characteristics. The presented formulation in form of the modified Johnson-Cook constitutive equation explains the size effect during micromilling. A parametric sensitivity analysis is performed with four different cutting speeds (500, 600, 700, and 800 m/min) and two contact friction coefficients (0.2 and 0.3) while keeping the feed rate constant (0.2 mm/teeth). It was observed that cutting speed and contract friction coefficient play a pivotal role in cutting reaction force and chip-tool interface temperature. A temperature in the range of 141-167 °C is predicted with different cutting speeds. The percentage deviations of the simulated cutting forces from the published experimental results are found promising. The estimated deviation may be because of compromising some imperative factors in numerical model, such as cutter vibrations, tool wear effect, tool run-out, and limitations, to develop an exact trochoidal trajectory.

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“…This behavior was identified for points of stress concentration and affected the fatigue life. 6 In Klocke et al, 7,8 further g-TiAl alloys were investigated using sodium nitrate and sodium chloride-based electrolytes. Surface roughnesses machined with sodium nitrate electrolyte were improved, and the effects of the selective etching were reduced.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the electrochemical machinability of electron beam melted and casted gamma titanium aluminide TNB-V5

Klocke

Herrig

Zeis

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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Additive manufacturing technologies are becoming more and more important for the implementation of efficient process chains. Due to the possibility of a near net shape, manufacturing time for finish-machining can significantly be reduced. Especially for conventionally hard to machine materials like gamma titanium aluminides (g-TiAl), this manufacturing process is very attractive. Nevertheless, for most applications, a rework of these generative components is necessary. Independently of the mechanical material properties, electrochemical machining is one promising technology of machining these materials. Major advantages of electrochemical machining are its process-specific characteristics of high material removal rates in combination with almost no tool wear. But electrochemical machining results are highly dependent on the microstructure of the material regarding the surface roughness. Therefore, this article deals with research on electrochemical machining of electron beam melted g-TiAl TNB-V5 compared to a casted form of this alloy. The difference between the specific removal rates as a function of current density is investigated using electrolytes based on sodium nitrate and sodium chloride. Moreover, the dissolving behavior of the electron beam melted and casted structure is analyzed by potentiostatic polarization curves. The surface roughness is heavily dependent on a homogeneous dissolution behavior of the microstructure. Thus, the mean roughness as a function of current density is investigated as well as rim zone analyses of the different structures.

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Experimental Research on the Electrochemical Machinability of selected γ-TiAl alloys for the Manufacture of Future Aero Engine Components

Cited by 36 publications

References 11 publications

Eﬀect of Ti3SiC2 Amount on Microstructure and Properties of TiAl Matrix Composites

Eﬀect of Ti3SiC2 Amount on Microstructure and Properties of TiAl Matrix Composites

Numerical modeling and simulation of macro- to microscale chip considering size effect for optimum milling characteristics of AA2024T351

Comparison of the electrochemical machinability of electron beam melted and casted gamma titanium aluminide TNB-V5

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