Surface Integrity of Titanium Alloy Ti-6Al-4V in Ball end Milling

Mhamdi, Mohamed Baccar; Boujelbene, M.; Bayraktar, E.; Zghal, Ali

doi:10.1016/j.phpro.2012.03.096

Cited by 53 publications

(20 citation statements)

References 12 publications

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“…This could be explained by the possible phase transformation or softening effect in Ginting's work where the depth of cut is larger than a finish turning. It is validated from the ball end milling of Ti-6Al-4V by Mhamdi et al [60], in which the depth of milling is only 0.5 mm. In the different study, Pan et al [61] reported that, the smallest grain size value is found on the machined workpiece surface in the orthogonal turning of Ti-6Al-4V, which indicates the largest hardness value.…”

Section: Titanium Alloysmentioning

confidence: 90%

Material microstructure affected machining: a review

2017

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-The machining induced material microstructure evolution path is determined from the temperature and mechanical loading history. Inversely, the machining forces and machined part surface integrity are dependent on the material microstructure attributes. Most of the previous research work with a microstructure consideration in machining stays largely on the experimental observation stage. A comprehensive thermal-mechanical-microstructure coupled machining process modeling framework is still missing. This paper reviews the recent research work on the material microstructure evolution in the context of machining components. The material microstructure property change on the workpiece material in the machining process are analyzed. The effects of material microstructure evolution on workpiece mechanical properties and surface integrity are investigated. It is concluded that a physical based material microstructure affected machining model is needed for the machining process optimization.

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Section: Titanium Alloysmentioning

confidence: 90%

Material microstructure affected machining: a review

2017

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“…Alpha phase consists of hexagonal closed packing (HCP) structure that remains stable from room temperature while beta phase is characterized by body centered cubic structure (BCP) which keeps it stable from room temperature to melting point. There are stabilizer elements adding them would increase the transformation temperature of alpha and beta phase and therefore the stability of respective phase (Mhamdi et al, 2012). For example, adding aluminum, carbon, oxygen and nitrogen would increase the stability of alpha phase on the other side adding vanadium, molybdenum, manganese, chromium and iron would increase stability of beta phase (Banerjee and Williams, 2013;Machado and Wallbank, 1990;Zhecheva et al, 2005).…”

Section: Workpiece Materialsmentioning

confidence: 99%

“…It is widely used in biomedical (medical implants) (Thepsonthi and Özel, 2012), aerospace (turbine blades, aerospace fasteners) (Thepsonthi and Özel, 2012) and automotive (connecting rods, engine and exhaust valves) (Wagner and Schauerte, 2007) and marine industry (Ezugwu and Wang, 1997) due to its high strength to weight ratio (Bajpai et al, 2013;Ezugwu and Wang, 1997;Jaffery et al, 2016;Kim et al, 2014;Mhamdi et al, 2012;Thepsonthi and Özel, 2012), property to withstand high temperature (Ezugwu and Wang, 1997;Mhamdi et al, 2012), biocompatibility (Jaffery et al, 2016;Kim et al, 2014;Thepsonthi and Özel, 2012) and corrosion resistance (Ezugwu and Wang, 1997; Kim et al, 2014;Mhamdi et al, 2012;Thepsonthi and Özel, 2012). On the other side there are properties which make it difficult to cut material such as low thermal conductivity (Ezugwu and Wang, 1997;Kim et al, 2014;Mhamdi et al, 2012;Thepsonthi and Özel, 2012), high chemical reactivity (Ezugwu and Wang, 1997;Mhamdi et al, 2012) and low elastic modulus (Ezugwu and Wang, 1997). Syed Husain Imran Jaffery observed that tool wear increases during the machining of Ti-6Al-4V alloy due to high chemical reactivity of titanium with cutting tool material and low thermal conductivity which leads to tool fracture as most of the heat generated goes into the cutting tool (Jaffery and Mativenga, 2009).…”

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confidence: 99%

Analysis of Burr Formation in Low Speed Micro-milling of Titanium Alloy (Ti-6Al-4V)

et al. 2018

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Abstract. The use of titanium based alloys in aerospace and biomedical applications make them an attractive choice for research in micro-machining. In this research, low speed micro-milling is used to analyze machinability of Ti-6Al-4V alloy as low speed machining setup is not expensive and it can be carried out on conventional machine tools already available at most machining setups. Parameters like feed per tooth, cutting speed and depth of cut are selected as machining variables and their effect on burr formation is analyzed through statistical technique analysis of variance to determine key process variables. Results show that feed per tooth is the most dominant factor in burr formation (81 % contribution ratio). The effect of depth of cut was found to be negligible. It was also observed that micro-milling at optimum process parameters showed minimum burr formation. In terms of burr formation, as compared to high speed machining setup, better results were achieved at low speed machining setup by varying machining parameters.

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“…Mhamdi et al 15 studied the influence of the position of the tool and the feed per tooth for the 3D roughness, micro-hardness and change in microstructure of titanium alloy Ti-6Al-4V during concave surface machining using a spherical end mill. The results showed better finish on upward and downward movement compared to machining on top.…”

Section: Introductionmentioning

confidence: 99%

Surface Integrity Analysis in Machining of Hardened AISI 4140 Steel

et al. 2017

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This study aimed to analyze the residual stresses and roughness in finishing milling of AISI 4140 steel, quenched and tempered up to hardness of 58 HRC. Machining operations were performed with the use of CBN inserts and by varying three basic cutting parameters (cutting speed, feed per tooth and cutting depth). Hardened materials are typically machined by abrasive processes, which in turn are more expensive and complex to be studied due to the undefined cutting geometry of the grinding wheel. A series of machining tests with milling process and CBN tools was implemented in order to study the resultant condition of the specimen´s surface. An experimental design was used and the results were statistically treated, enabling the generation of a model that aims to obtain roughness values due to the optimization of three adopted cutting parameters. The roughness values found in the range of R a 0,16 to 0,4 µm indicate that it is possible to use the milling process with CBN tools for finishing, reducing machining time and the cost of the machined part. The generated residual stresses were compressive and the feed per tooth parameter showed greater influence in this result. The research was limited to test only one type of CBN insert, which was constantly replaced, preventing the influence of tool wear on responses. The geometry of the tool as well as the use of cutting fluid were not considered. Milling process with CBN inserts is confirmed as a possibility for replacing grinding process for finishing machining leading to significant gains in machining time. An optimized model was derived to predict the value of the roughness and three optimizations were made to specify the best cutting parameters to desirable answers such as better roughness, higher compressive residual stresses and low cutting forces, for example.

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Surface Integrity of Titanium Alloy Ti-6Al-4V in Ball end Milling

Cited by 53 publications

References 12 publications

Material microstructure affected machining: a review

Material microstructure affected machining: a review

Analysis of Burr Formation in Low Speed Micro-milling of Titanium Alloy (Ti-6Al-4V)

Surface Integrity Analysis in Machining of Hardened AISI 4140 Steel

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