Comparative machinability study on Ti54M titanium alloy in different heat treatment conditions

Abstract

In this study, the effect of microstructure on the machinability of Ti54M titanium alloy was investigated experimentally for the as-received (annealed), b-annealed and solution-treated plus aged conditions. Forces and temperature, that is, tool life, are mainly affected by variation in cutting speed and feed; therefore, the depth of cut was maintained constant while cutting speed and feed were varied. Ti54M alloy in annealed heat treatment condition showed the better machinability (in terms of specific forces, coefficient of friction and chip morphology) among all the analyzed alloys. This is due to the finer microstructure which enhanced the plastic deformability.

Experimental Comparison between Traditional and Cryogenic Cooling Conditions in Rough Turning of Ti-6Al-4V

“…The certificate of the adopted material, provided by the seller, reports a tensile strength of 934 MPa and a yield strength of 867 MPa. The effect of the microstructure of titanium alloys on their machinability is relevant, as demonstrated by several authors [22][23]. The material microstructure has been analysed along the bar diameter and it can be considered quite homogeneous, according to a micrographic that shows a substantially uniform granularity across the cross section of the bars.…”

“…Where Fc is the cutting force, Fn is the normal force on the cutting plane defined by feed force (Ff) and radial force (Fr) as follows: 22 .…”

Design-of-experiments application in machining titanium alloys for aerospace structural components

“…Titanium alloys have outstanding physical-mechanical properties, but they are difficultto-machine materials because of their high chemical reactivity, poor heat conductivity, low modulus of elasticity, which lead to lower production rates and increased tool wear [1][2][3][4][5][6][7][8][9][10]. Hence, these alloys are used in a wide range of applications in aerospace, automotive, chemical, and medical industries.…”

“…In the near future, Ti54M is likely to replace the Ti6Al4V in the aerospace applications [4][5][6][7][8][9][10][11][12][13][14][15]. Titanium alloys like Ti54M and Ti10.2.3 are increasingly being used in the aerospace industry.…”

“…[13,14] have found that the machinability depends on the chemistry, i.e. The experimental studies carried out on Ti54M and Ti10.2.3 alloy in various heat treatment conditions showed that these alloys have the better machinability in the annealed heat treated condition [6][7][8][9][10][11]. A few research papers have been published dealing with the machining of Ti54M and Ti10.2.3 alloys [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”