Generation of Defects Due to Machining of TiAl Intermetallic Compound and Their Effects on Mechanical Strength

Furusawa, Toshiaki; Hino, Hiroshi; Tsuji, Sinji; Koroyasu, Sadatoshi; Ichikawa, Atsushi

doi:10.1115/1.1751425

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…There were surface defects, such as cracks and peelings, observed in each cutting conditions. Although Furusawa et al [2] only reported the cracks which are generated perpendicular to the cutting direction, there are also cracks generated in other directions as well. In Fig.…”

Section: Results and Discussion 31 Observation Of Machined Surfacementioning

confidence: 99%

“…Although there is an attempt of shaping process by precision casting, finish by cutting is still necessary for high accuracy. Furusawa et al reported that when lamellar structure had been cut, surface defects observed, which oriented perpendicular to the cutting direction on machined surface [2]. It was also pointed out that these defects weaken bending strength remarkably.…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal Cutting of Ti-48at%Al Lamellar Structure Alloy

Saiki

Sasaki

Yakou

2007

LEM21

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The machinability, especially generation of surface defects, of Ti-47.7at%Al fully lamellar structure was examined by orthogonal cutting. Although surface defects were observed in every cutting condition, the machined surface tended to be significantly smoother as the depth of cut decreased 100µm to 20µm, and the rake angle of the tool was changed +5° to -5°. The surface defects were categorized into 2 groups depending on whether it is caused by lamellar layer, or lamellar colony boundary. It is discovered that the former is generated preferentially onto certain lamellar angle, and the latter showed no relation to the lamellar angle.

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Section: Results and Discussion 31 Observation Of Machined Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Orthogonal Cutting of Ti-48at%Al Lamellar Structure Alloy

Saiki

Sasaki

Yakou

2007

LEM21

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“…In order to optimize the tool life, several studies analyzed inherent and noninherent factors such as cutting parameters, tool holders, machine, tool material, geometry, coatings, among others. 85…”

Section: Surface Integrity Of Titanium Aluminides Based Alloysmentioning

confidence: 99%

Machinability of titanium aluminides: A review

Castellanos

Cavaleiro

Jesus

et al. 2018

Proceedings of the IMechE

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Titanium aluminides are used in the aeronautical and automotive field as an alternative material to manufacture critical components exposed to high temperatures and corrosive environments. These alloys due to its intermetallic structure exhibit some special properties such as low density, high strength, high stiffness, corrosion resistance, and creep resistance. When these components are manufactured, surface integrity is one of the most relevant parameters used to evaluate the quality of the parts. Severe surface integrity problems are reported in the literature, defects such as microstructural alterations, work hardening, residual stresses, surface cracks, among others induced by the cutting process. The surface and sub-surface alteration induced by machining are critical because it will affect the parts performance. Some parameters affect the quality of machined surface. In particular cutting parameters, cutting tools material, tool wear and material properties are the most frequently investigated. Experimental and empirical studies are presented mainly in order to understand the surface integrity induced by machining. This paper provides an overview of the problems associated with the machining process of various types of titanium aluminides. The cutting tools, machining parameters, as well as processing parameters employed to improve machinability and reduce surface defects in titanium aluminides are analyzed and discussed. Particular focus was given to turning and milling process of gamma titanium aluminides. Also, some of the optimal parameters for machining titanium aluminides are presented offering a compilation of the most relevant information from the first to the most recent works that analyze the different aspects that affect the machining of these alloys.

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“…The MAZ also formed with unique properties. In the samples subjected to HSM, the thickness of PDD was very small compared with the workpieces subjected to a conventional cutting condition such as turning and grinding [63,64]. Hence, surface and subsurface micro hardness and nanohardness was investigated in samples with various cutting conditions.…”

Section: Deformation Of Subsurface Layersmentioning

confidence: 99%

Surface integrity in high-speed milling of gamma titanium aluminide under MQL cutting conditions

Kolahdouz

Arezoo

Hadi

2014

2014 5th Conference on Thermal Power Plants (CTPP)

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Intermetallic alloys based on gamma titanium aluminide (y-TiAI) are considered to be one of the best replacements for nickel-based super alloys (used in gas turbine blade) because of their unique set of properties. However the machinability of y-TiAI is faced with restrictions and limitations due to the alloy's mechanical and metallurgical properties. Some of the most restricting properties include high temperature yield strength and wear resistance, even at elevated temperatures. Machining of y-TiAI can also cause defects such as the formation of micro cracks on the machined surfaces. To explore the surface integrity of y-TiAI under different cutting conditions, a series of machining experiments were carried out. High-speed and ultra high-speed milling of y-TiAI were examined under dry and minimum quantity lubrication (MQL) conditions. This research outlines the effects of cutting conditions on the surface integrity and Machining Affected Zone (MAZ). Two-and three dimensional surface parameters were measured. In addition, the effects of machining parameters were studied using an analysis of variance (ANOV A). In addition, a mathematical model for the surface roughness measurements was developed in the present work. Likewise, other effects of surface alterations, including material pullout, deformations of the lamellae and micro cracks, were studied with optical microscopes (OM) and Scanning Electron Microscopes (SEM). Microhardness evaluation of the surface and subsurface indicated a significant difference between the surface and the bulk of the material (subsurface layers). x ray diffraction analysis showed a phase transformation on the machined surfaces. Finally, the results of the present work are compared with previous works on machining of gamma titanium aluminide.

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Generation of Defects Due to Machining of TiAl Intermetallic Compound and Their Effects on Mechanical Strength

Cited by 8 publications

References 11 publications

Orthogonal Cutting of Ti-48at%Al Lamellar Structure Alloy

Orthogonal Cutting of Ti-48at%Al Lamellar Structure Alloy

Machinability of titanium aluminides: A review

Surface integrity in high-speed milling of gamma titanium aluminide under MQL cutting conditions

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