Effect of β phase fraction in titanium alloys on chip segmentation in their orthogonal machining

Joshi, Shashikant; Pawar, Pravin; Tewari, Ashish; Joshi, Suhas S.

doi:10.1016/j.cirpj.2014.03.001

Cited by 23 publications

(11 citation statements)

References 12 publications

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“…This tendency is in agreement with findings in the literature [19,56,57]. In addition, all segment frequencies recorded for both supply systems were within the acceptable range of 4-22 kHz for α+ß titanium alloy (Ti-6Al-4V) [56]. The use of Cut-list resulted in reductions in values of ƒ chip at all cutting conditions, with a minimum obtained at 95 m/min and 0.15 mm/rev.…”

Section: Resultssupporting

confidence: 91%

“…This helped to reduce shear formation, thus offering larger shear spacing and an increase in segment width. The width of segmented chips was also found to increase, which helped to promote less shear formation during the ultrasonicassisted turning of Ti-6Al-4V [56]. However, the use of Cut-list resulted in marginally higher segment width owing to its cooling potency.…”

Section: Resultsmentioning

confidence: 97%

“…Chip segmentation frequency was computed using ƒ chip = v/w [56], where ƒ chip is the frequency of segmentation in Hz, v is cutting speed in m/s and w is the saw-tooth width of the segment in m. Values for ƒ chip are presented in Figure 21 showing that segmentation frequency clearly increases with cutting speed and decreases with increased feed rate. This tendency is in agreement with findings in the literature [19,56,57]. In addition, all segment frequencies recorded for both supply systems were within the acceptable range of 4-22 kHz for α+ß titanium alloy (Ti-6Al-4V) [56].…”

Section: Resultsmentioning

confidence: 99%

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Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

Shyha

Gariani

El‐Sayed

et al. 2018

Metals

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Microstructure and chip formation were evaluated during the step shoulder down-milling of Ti-6Al-4V using a water-miscible vegetable oil-based cutting fluid. Experiments were conducted using the Cut-list fluid supply system previous developed by the authors and a conventional cutting fluid supply system. A thin plastically deformed layer below the machined surface was observed during the metallurgical investigation of the surfaces produced using both systems. Despite noticeable reductions in cutting fluid consumption achieved by Cut-list, no significant disparity was found in microstructural damage. The microstructure of the machined surfaces was strongly affected by cutting speed and fluid flow rate with a discontinuous serrated chip being the principal type. However, increases in cutting fluid flow rate associated with increased cutting speed significantly changed chip morphology where average distance between chip segments increased with cutting speed. Cut-list produced smaller saw-tooth height and larger segmented width, while the transition from aperiodic to periodic serrated chip formation was governed by cutting speed and feed rate. Chip segmentation frequency and shear angle were also sensitive to cutting speed.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

Shyha

Gariani

El‐Sayed

et al. 2018

Metals

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“…There are many publications studied the machinability of Ti6Al4V alloy and b group alloys such as Ti555.3 and Ti1023 [7][8][9][10]. These studies show that b group alloys are more difficult to machine than Ti6Al4V alloy due to their high strength and toughness.…”

Section: Introductionmentioning

confidence: 99%

An experimental research on the machinability of a high temperature titanium alloy BTi-6431S in turning process

Gao

Xiao

et al. 2018

Manufacturing Rev.

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Titanium alloys are extensively applied in the aircraft manufacturing due to their excellent mechanical and physical properties. At present, the α + β alloy Ti6Al4V is the most commonly used titanium alloy in the industry. However, the highest temperature that it can be used only up to 300 °C. BTi-6431S is one of the latest developed high temperature titanium alloys, which belongs to the near-α alloy group and has considerably high tensile strength at 650 °C. This paper investigates the machinability of BTi-6431S in the terms of cutting forces, chip formation and tool wear. The experiments are carried out in a range of cutting parameters and the results had been investigated and analyzed. The investigation shows that: (1) the specific cutting forces in the machining of BTi-6431S alloy are higher than in the machining of Ti6Al4V alloy; (2) the regular saw-tooth chips more easily formed and the shear bands are narrower in the machining of BTi-6431S; (3) SEM and EDS observations of the worn tools indicate that more cobalt elements diffuse into the workpiece from tool inserts during machining of BTi-6431S alloy, which significantly aggravates tool wear rate. The experimental results indicate that the machinability of BTi-6431S near alpha titanium alloy is significantly lower than Ti-6Al-4V alloy.

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“…In comparison to the highly localised shear bands observed in cutting of other titanium alloys [23][24][25][26], the expanded shear band regions observed for the Ti-25Nb-3Mo-3Zr-2Sn alloy are relatively diffuse. Under the current cutting conditions, for the Ti-25Nb-3Mo-3Zr-2Sn alloy these zones are around 100 μm in width and of a similar magnitude to that of the regions with more limited deformation.…”

Section: Discussionmentioning

confidence: 98%

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Kent¹,

Rashid²,

Bermingham³

et al. 2018

Preprint

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bstract: New metastable β titanium alloys are receiving increasing attention due to their excellent biomechanical properties and machinability is critical to their uptake. In this study machining chip microstructure have been investigated to gain an understanding of strain and temperature fields during cutting. For higher cutting speeds, ≥60 m/min, the chips have segmented morphologies characterised by a serrated appearance. High levels of strain in the primary shear zone promote formation of expanded shear band regions between segments which exhibit intensive refinement of the β phase down to grain sizes below 100 nm. The presence of both α and β phases across the expanded shear band suggests that temperatures during cutting are in the range of 400-600°C. For the secondary shear zone, very large strains at the cutting interface result in heavily refined and approximately equiaxed nanocrystalline β grains with sizes around 20-50 nm, while further from the interface the β grains become highly elongated in the shear direction. An absence of the α phase in the region immediately adjacent to the cutting interface indicates recrystallization during cutting and temperatures in excess of the 720°C β transus temperature.

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Effect of β phase fraction in titanium alloys on chip segmentation in their orthogonal machining

Cited by 23 publications

References 12 publications

Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

An experimental research on the machinability of a high temperature titanium alloy BTi-6431S in turning process

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

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Effect of β phase fraction in titanium alloys on chip segmentation in their orthogonal machining

Cited by 23 publications

References 12 publications

Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

Analysis of Microstructure and Chip Formation When Machining Ti-6Al-4V

An experimental research on the machinability of a high temperature titanium alloy BTi-6431S in turning process

Insights Into Machining of a &beta; Titanium Biomedical Alloy from Chip Microstructures

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Product

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Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures