An overview of the machinability of aeroengine alloys

Ezugwu, E. O.; Bonney, J.; Yamane, Yasuo

doi:10.1016/s0924-0136(02)01042-7

Cited by 970 publications

(501 citation statements)

References 79 publications

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“…Titanium alloys are widely used particularly in the aerospace and biomedical industry [1][2][3]. This state is affected by the large number of favourable properties of these alloys [4][5][6]: high strength-to-weight ratio, biocompatibility, high corrosion and creep resistance, and high strength at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Performance evaluation of the grinding wheel with aggregates of grains in grinding of Ti-6Al-4V titanium alloy

Kacalak

Lipiński

Bałasz

et al. 2017

Int J Adv Manuf Technol

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The results of grinding are highly dependent on conditions of workpiece removal process. The material is removed by an unspecified number of abrasive grains of irregular shape and random distribution on the grinding wheel active surface. The interaction between the abrasive grain and the workpiece can be divided into three stages: (i) rubbing, (ii) ploughing and (iii) chip formation. Reciprocal contribution of each stage is dependent on the properties of the workpiece, the grinding parameters, the friction condition between the abrasive grain and the workpiece and the shape of the grains. In the article, the results of numerical and experimental process in the analysis of grinding of Ti-6Al-4V titanium alloy, using a conventional grinding wheel and a newly developed grinding wheel with aggregates of grains, were presented. The analysis of influence of the geometric parameters of the abrasive aggregates and the abrasive grains on the effectiveness of the workpiece removal process is presented. The effects of the geometrical parameters of grains and abrasive aggregates in direction of motion as well as in transversal direction on the size of ridges were determined. It has been observed that increase of the length of sideway material displacement results in the decrease of ridge formation. The results of a numerical analysis were confirmed by experimental research. The analysis of the impact of utilization of abrasive aggregates on the grinding forces, grinding-specific energy and surface roughness was performed. The impact of abrasive aggregates on the decrease of grinding forces and specific energy and the increase of quality of ground surface was observed.

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Section: Introductionmentioning

confidence: 99%

Performance evaluation of the grinding wheel with aggregates of grains in grinding of Ti-6Al-4V titanium alloy

Kacalak

Lipiński

Bałasz

et al. 2017

Int J Adv Manuf Technol

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“…Additionally, high friction at the flank and rake faces of the tool leads to localized high-temperature zones at the tool-chip interface, accelerating tool wear and eventually causing premature tool failure [5]. A use of cutting fluids for cooling and lubrication is typically recommended in the machining of titanium alloys to avoid rapid tool wear [6]. Their primary goal is to dissipate generated heat from the work-piece and the machine tool thus avoiding rapid localized thermal expansions at the tool tip.…”

Section: Introductionmentioning

confidence: 99%

Enhanced ultrasonically assisted turning of a β-titanium alloy

et al. 2013

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“…According to Ezugwu et al (2003) and Simms (1972), the main difficulties founded in machining superalloys, in particular the nickel and titanium base alloy can be summarized as:…”

Section: Advanced Materials Research Vol 278 313mentioning

confidence: 99%

“…They exhibit higher strength to weight ratio, relative to steel that is denser. Nickel base alloys are also used for other applications such as marine equipment, nuclear reactors, petrochemical plants, food processing equipment and pollution control apparatus (Ezugwu, 2003).…”

Section: Introductionmentioning

confidence: 99%

Study of the Turning Nickel Base Alloy Pyromet<sup>®</sup> 31V (SAE HEV8)

Ribeiro

Bahia

2011

AMR

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Abstract. Considering the constant technological developments in the aeronautical, space, automotive, shipbuilding, nuclear and petrochemical fields, among others, the use of materials with high strength mechanical capabilities at high temperatures has been increasingly used. Among the materials that meet the mechanical strength and corrosion properties at temperatures around 815 °C one can find the nickel base alloy Pyromet® 31V (SAE HEV8). This alloy is commonly applied in the manufacturing of high power diesel engines exhaust valves where it is required high resistance to sulphide, corrosion and good resistance to creep. However, due to its high mechanical strength and low thermal conductivity its machinability is made difficult, creating major challenges in the analysis of the best combinations among machining parameters and cutting tools to be used. Its low thermal conductivity results in a concentration of heat at high temperatures in the interfaces of workpiece-tool and tool-chip, consequently accelerating the tools wearing and increasing production costs. This work aimed to study the machinability, using the carbide coated and uncoated tools, of the hot-rolled Pyromet® 31V alloy with hardness between 41.5 and 42.5 HRC. The nickel base alloy used consists essentially of the following components: 56.5% Ni, 22.5% Cr, 2,2% Ti, 0,04% C, 1,2% Al, 0.85% Nb and the rest of iron. Through the turning of this alloy we able to analyze the working mechanisms of wear on tools and evaluate the roughness provided on the cutting parameters used. The tests were performed on a CNC lathe machine using the coated carbide tool TNMG 160408-23 Class 1005 (ISO S15) and uncoated tools TNMG 160408-23 Class H13A (ISO S15). Cutting fluid was used so abundantly and cutting speeds were fixed in 75 and 90 m/min. to feed rates that ranged from 0.12, 0.15, 0.18 and 0.21 mm/rev. and cutting depth of 0.8mm. The results of the comparison between uncoated tools and coated ones presented a machined length of just 30% to the first in relation to the performance of the second. The coated tools has obtained its best result for both 75 and 90 m/min. with feed rate of 0.15 mm/rev. unlike the uncoated tool which obtained its better results to 0.12 mm/rev.

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An overview of the machinability of aeroengine alloys

Cited by 970 publications

References 79 publications

Performance evaluation of the grinding wheel with aggregates of grains in grinding of Ti-6Al-4V titanium alloy

Performance evaluation of the grinding wheel with aggregates of grains in grinding of Ti-6Al-4V titanium alloy

Enhanced ultrasonically assisted turning of a β-titanium alloy

Study of the Turning Nickel Base Alloy Pyromet<sup>®</sup> 31V (SAE HEV8)

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