Experimental and theoretical study of the microscopic crater wear mechanism in titanium machining

Odelros, Stina; Kaplan, Bartek; Kritikos, M.; Johansson, Malin B.; Norgren, Susanne

doi:10.1016/j.wear.2017.01.104

Cited by 53 publications

(39 citation statements)

References 19 publications

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“…Thus, in the cutting zone, the temperature becomes very high; the specific cutting force exceeds 2800 MPa which leads to the plastic deformation of the cutting edge [34]. The excessive heat generation also accelerates adhesion and diffusion mechanisms [10,30]. Similarly, the increase of the cutting speed and feed rate resulted in a very rapid degradation of tool life; the resulting temperature rise plays a key role in accelerating tool wear.…”

Section: Discussionmentioning

confidence: 99%

“…Under these cutting conditions, crater wear becomes more pronounced with the increase of the lubricant-jet pressure. Generally, the crater formation mechanism is often related to the activation and the acceleration of diffusion at high cutting temperatures [10,30]. Optimum cutting conditions and an effective lubrication must avoid overheating of the cutting zone and thus slowdown crater formation.…”

Section: Cutting Speed Influencementioning

confidence: 99%

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High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

Ayed

Germain

2018

Int J Adv Manuf Technol

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The main objective of this study is to investigate uncoated tungsten carbide tool wear mechanisms for high-pressure waterjet machining of the Ti555-3 titanium alloy. A comparative study has been undertaken (i.e. conventional versus assisted machining) based on numerous experimental tests. These tests have been accompanied by the measurement of the cutting forces and flank wear. It is concluded that the high-pressure water-jet assistance can greatly increase tool life compared to conventional machining, for all cutting conditions. The gain in tool life depends on the severity of the cutting condition. The analyses performed for each test (i.e. SEM, EDS and 3D profilometer) made it possible to monitor the tool wear and to investigate the main wear mechanisms. Based on these analyses, adhesion wear appears to be the most influential mechanism and it is accelerated by an increase in water-jet pressure. Monitoring of the wear profile made it possible to study the evolution of crater wear and material chipping during machining.

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Section: Discussionmentioning

confidence: 99%

Section: Cutting Speed Influencementioning

confidence: 99%

High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

Ayed

Germain

2018

Int J Adv Manuf Technol

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“…The computer coupling of phase diagrams and thermochemistry (CALPHAD) method using Thermo-Calc [20] succeeds in evaluating the phase stability of Inconel 718 [21]. Thermo-Calc has also been successful in simulating diffusion and chemical interaction between a workpiece and cemented carbide tooling [2][3]. Thermo-Calc calculations of Inconel 718 at high pressure and high temperature have not been assessed in literature, and neither has the interaction between Inconel 718 and tool materials.…”

Section: Methodsmentioning

confidence: 99%

“…While there is evidence of chemical and diffusional mechanisms with cemented carbide tooling [2][3][4], less is known about PCBN tooling. A diffusion couple study [5] of cubic boron nitride and elemental iron did not register a chemical interaction.…”

Section: Introductionmentioning

confidence: 99%

On chemical and diffusional interactions between PCBN and superalloy Inconel 718: Imitational experiments

Bushlya

Bjerke

Turkevich

et al. 2019

Journal of the European Ceramic Society

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On chemical and diffusional interactions between PCBN and superalloy Inconel 718Imitational experiments Bushlya, V.; Bjerke, A.; Turkevich, V. Z.; Lenrick, F.; Petrusha, I. A.; Cherednichenko, K. A.; Ståhl, J. E. AbstractDuring a metal cutting process, chemical wear can become the dominant mechanism of tool degradation under the high temperatures and contact pressures that arise between the tool and the metal workpiece. This study focuses on the chemical and diffusional interactions between superalloy Inconel 718 and cubic boron nitride (cBN) tool material with and without TiC binder. It covers thermodynamic modeling and experimental tests in the pressure range of 0.1 Pa to 2.5 GPa at temperatures up to 1600 °C. The methods used include diffusion couples under both vacuum and high pressure, transmission electron microscopy (TEM) analysis and in-situ synchrotron observations. It is shown that cBN is prone to diffusional dissolution in the metal and to reactions with niobium, molybdenum, and chromium from Inconel 718. Adding TiC binder changes the overall degradation process because it is less susceptible to these interaction mechanisms.

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“…An example is machining of titanium alloys. The wear of uncoated cemented carbide inserts is said to be accompanied by formation of titanium-rich carbides at the tool-workpiece interface [23][24][25] and/or carbon depletion and formation of pure tungsten [23].…”

Section: Introductionmentioning

confidence: 99%

Tool wear by dissolution during machining of alloy 718 and Waspaloy: a comparative study using diffusion couples

Hoier

Surreddi

Klement

2019

Int J Adv Manuf Technol

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The wear of metal cutting tools is known to take place by the combined and simultaneous effects of several wear mechanisms. Knowledge of the relative contribution of the individual wear mechanisms is required to understand and predict the tool wear during cutting different workpiece materials and alloys. It has been shown previously that machining two heat resistant superalloys, alloy 718 and Waspaloy, leads to distinctively different tool wears. Even though the subject has been addressed in various studies, there are still open questions regarding the underlying reasons for the differing tool wear rates. In particular, the relative contributions of diffusion/dissolution when machining the two alloys have not been addressed so far. Therefore, a qualitative comparison of the chemical interaction between the tool material and the two superalloys was made by using diffusion couple tests. The aim was to mimic the high temperatures and intimate contact between workpiece and tool material at the tool rake and flank faces during cutting under controlled and static conditions. The obtained results suggest that it is unlikely that differences in flank wear rate when machining the two superalloys are caused by significantly varying magnitudes of tool atoms dissolving into the respective workpiece. Analysis of the tool/superalloy interfaces in the diffusion couples revealed diffusion-affected zones of similar size for both tested superalloys. Increasing test temperature led to enhanced interdiffusion which suggests an increase in tool wear by diffusion/dissolution for higher cutting temperature. For alloy 718, the higher test temperature also led to depletion of carbon together with formation of tungsten within the tool in close vicinity to the interface with the superalloy.

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Experimental and theoretical study of the microscopic crater wear mechanism in titanium machining

Cited by 53 publications

References 19 publications

High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

High-pressure water-jet-assisted machining of Ti555-3 titanium alloy: investigation of tool wear mechanisms

On chemical and diffusional interactions between PCBN and superalloy Inconel 718: Imitational experiments

Tool wear by dissolution during machining of alloy 718 and Waspaloy: a comparative study using diffusion couples

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