Parametric Investigation of Laser‐Assisted Machining of Commercially Pure Titanium

Sun, Shoujin; Harris, James G.; Brandt, Milan

doi:10.1002/adem.200700349

Cited by 77 publications

(37 citation statements)

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“…Therefore, external heat can be supplied to the workpiece materials to make it softer and easier for a cutting tool to remove a given amount of material, this technique is called hot machining (Ezugwu and Wang, 1997). Various types of heat sources have been used for thermal softening of the workpiece materials, for instance, gas torch, (Lajis et al, 2009, Maity and Swain, 2008, Ozler et al, 2001, Pal and Basu, 1971, furnace pre-heating (Amin and Talantov, 1986), induction heating (Amin et al, 2008), electric-current heating (Moriwaki et al, 1992) (Uehara et al, 1983), plasma heating (Kitagawa and Maekawa, 1990) (Germain et al, 2011, Hinds and De Almeida, 1981, Sun et al, 2008 and laser heating (Chryssolouries et al, 1997).…”

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confidence: 99%

Thermally enhanced ultrasonically assisted machining of Ti alloy

Muhammad

Maurotto

Demiral

et al. 2014

CIRP Journal of Manufacturing Science and Technology

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Recently, a non-conventional machining technique known as ultrasonically assisted turning (UAT) was introduced to machine modern alloys, in which low-energy, highfrequency vibration is superimposed on the movement of a cutting tool during a conventional cutting process. This novel machining technique, results in a multi-fold decrease in the level of cutting forces with a concomitant improvement in surface finish of machined modern alloys. Also, since the late 20 th century, machining of wear resistant materials that soften when heated have been carried out with hot machining techniques. In this paper, a new hybrid machining technique called Hot Ultrasonically AssistedTurning (HUAT) is introduced for the processing of a Ti-based alloy. In this technique,UAT is combined with a traditional hot machining technique to gain combined advantages of both schemes for machining of intractable alloys. HUAT of the Ti alloy was analysed experimentally and numerically to demonstrate the benefits in terms of reduction in the cutting forces and improvement in surface roughness over a wide range of industrially relevant speed-feed combinations for titanium alloys.

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confidence: 99%

Thermally enhanced ultrasonically assisted machining of Ti alloy

Muhammad

Maurotto

Demiral

et al. 2014

CIRP Journal of Manufacturing Science and Technology

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“…This arrangement is sometimes preferred since machining is easy and the laser equipment does not come close to the machining area, but the heating efficiency of the machined surface is poor in this case and is not high enough deep for cut. The other alternative used by many researchers (24)(25)(26) is to place the laser gun incident normal to the cutting (chamfer) surface (as shown in Figure 4). The laser spot size is required to fully cover the chamfer surface in order to achieve uniform reduction in the cutting forces in the x-, y-, and zdirections (26).…”

Section: Principle Of Lam Application In Turningmentioning

confidence: 99%

“…The other alternative used by many researchers (24)(25)(26) is to place the laser gun incident normal to the cutting (chamfer) surface (as shown in Figure 4). The laser spot size is required to fully cover the chamfer surface in order to achieve uniform reduction in the cutting forces in the x-, y-, and zdirections (26). However, even partial coverage of the chamfer surface by the laser beam close to the machined surface can dramatically reduce tool wear (27).…”

Section: Principle Of Lam Application In Turningmentioning

confidence: 99%

“…Tool-beam distance, along with cutting speed, determines the time interval between the laser heating and machining operation and hence the temperature distribution at the cutting zone. It is found that the larger reduction in the cutting forces is achieved with the laser spot positioned closer to the cutting tool when cutting hardened steel (30), commercially pure titanium (26), and high chromium white cast iron (31). However, if the tool-beam is too close to the tool, machining problems may result (32).…”

Section: Principle Of Lam Application In Turningmentioning

confidence: 99%

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Heat-Assisted Machining

Amin¹,

Ginta²

2014

Comprehensive Materials Processing

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“…This method has been studied by some researchers and is believed to be a promising method to reduce the machining cost of difficult to machine materials. Sun et al [305] carried out a parametric investigation on laser assisted machining of commercially pure titanium, compared to conventional machining. In this study both a lower magnitude and lower variation of cutting forces and a smoother surface finish were achieved.…”

Section: Introductionmentioning

confidence: 99%

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

Zhan¹

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Titanium and its alloys fulfil a wide range of applications involving aerospace, biomedical, chemical and petroleum industries due to their extraordinary properties such as high specific strength, excellent biocompatibility and corrosion resistance. Among different types of titanium alloys, β titanium alloys have a unique range of properties such as an excellent combination of high strength and fracture toughness and low Young's modulus. Therefore, the usage of β titanium alloys in the manufacturing of some key components in aerospace and biomedical industries has continually increased in the past decade.Nowadays many commercial manufacturing processes for metallic materials such as machining, explosive welding, hot forging and extrusion employ high strain rates and are conducted at elevated temperatures. Also, high-strain-rate deformation can be encountered in collisions such as in car crashes, bird strikes on airplanes and micrometeorite impacts on space structures. Hence a large number of studies have been conducted on the dynamic response of metallic materials including copper, steels, tantalum, Ti-6Al-4V alloy and commercially pure titanium to high strain rates. Due to limited knowledge of the dynamic behaviour of β titanium alloys, this thesis mainly investigates the stress-strain behaviour and microstructural evolution of β titanium alloys under high strain rates at room and elevated temperatures.Split Hopkinson Pressure Bar compressive tests were carried out on two new types of β titanium alloys with different levels of β phase stability, the Ti-6Cr-5Mo-5V-4Al (wt. %) and Ti-25Nb-3Zr-3Mo-2Sn (wt.%) alloys, at strain rates ranging from 10 -3 s -1 to 10 4 s -1 and temperatures ranging from 293K to 1173K. The Ti-6Cr-5Mo-5V-4Al alloy, with relatively high β phase stability, represents an alloy type which can be engineered through heat treatment or thermo-mechanical processing to achieve a superior combination of strength and fracture toughness. While the Ti-25Nb-3Zr-3Mo-2Sn alloy with relatively low β phase stability represents an alloy type which can be applied in biomedical applications due to their low Young's modulus and superelastic properties.For the Ti-6Cr-5Mo-5V-4Al alloy, dislocation slip is dominant at all testing strain rates and temperatures in this research. The flow stress increases with increasing strain rate but decreasing temperature. Also, it is more sensitive to temperature than strain rate. At ambient temperatures, the strain hardening rate exhibited by the Ti-6Cr-5Mo-5V-4Al alloy at high strain rates is much lower than that at quasi-static strain rates, which is attributed to the thermal softening effect brought byHongyi Zhan II The University of Queensland adiabatic heating. While for the Ti-25Nb-3Zr-3Mo-2Sn alloy, multiple deformation mechanisms including dislocation slip, {332} <113> and {112} <111> mechanical twinning, stress-induced martensitic α" and ω phase transformations can be activated simultaneously and among them {332} <113> twinning is dominant at 293K regardless of...

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Parametric Investigation of Laser‐Assisted Machining of Commercially Pure Titanium

Cited by 77 publications

References 17 publications

Thermally enhanced ultrasonically assisted machining of Ti alloy

Thermally enhanced ultrasonically assisted machining of Ti alloy

Heat-Assisted Machining

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

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