Effects of tool coating and tool wear on the surface and chip morphology in side milling of Ti₂AlNb intermetallic alloys

Abstract

Ti₂AlNb intermetallic alloys, which belong to the titanium aluminum (TiAl) family, are currently being extensively researched and promoted in the aerospace industry because of their exceptional properties, including low density, high-temperature strength, and excellent oxidation resistance. However, the excellent fracture toughness of the material leads to the formation of surface defects during machining, thereby affecting the quality of the machined surface. In this study, Ti₂AlNb intermetallic alloys were subjected to side-milling trials to investigate the influence of tool coating and tool wear on both the machined surface quality and chip morphology. Specifically, the tool life, machined surface roughness, surface morphology, surface defects, and chip morphology were investigated in detail. The results indicated that the tool coating provided a protective effect, resulting in a threefold increase in the service life of the coated end mill compared to that of the uncoated one. A coated end mill yields a superior machined surface topography, as evidenced by reduced roughness and a more consistent morphology. Tool wear has a significant effect on the morphology of machined surfaces. The occurrence of material debris and feed marks became increasingly severe as the tool wore off. The chip morphology was not significantly affected by the tool coating. However, tool wear results in severe tearing along the chip edge, obvious plastic flow on the non-free surface, and a distinct lamellar structure on the free surface.

Keywords

Ti₂AlNb intermetallic alloy / Tool coating / Tool wear / Surface morphology / Chip morphology

References

[1] Hukkerikar AV, Arrazola PJ, Aristimuño P, et al. A tribological characterisation of Ti-48Al-2Cr-2Nb and Ti-6Al-4V alloys with dry, flood, and MQL lubricants. CIRP J Manuf Sci Technol, 2023, 41: 501-523

[2] He LJ, Su HH, Xu JH, et al. Inverse identification of constitutive parameters of Ti₂AlNb intermetallic alloys based on cooperative particle swarm optimization. Chin J Aeronaut, 2018, 31: 1774-1785

[3] Xu RR, Li MQ, Zhao YH. A review of microstructure control and mechanical performance optimization of γ-TiAl alloys. J Alloys Compd, 2023, 932: 167611

[4] Anwar S, Ahmed N, Pervaiz S, et al. On the turning of electron beam melted gamma-TiAl with coated and uncoated tools: a machinability analysis. J Mater Process Technol, 2020, 282: 116664

[5] Zhao B, Ding WF, Shan ZD, et al. Collaborative manufacturing technologies of structure shape and surface integrity for complex thin-walled components of aero-engine: status, challenge and tendency. Chin J Aeronaut, 2023, 36: 1-24

[6] He LJ, Su HH, Xu JH, et al. Study on dynamic chip formation mechanisms of Ti₂AlNb intermetallic alloy. Int J Adv Manuf Technol, 2017, 92: 4415-4428

[7] Xi XX, Yu TY, Ding WF, et al. Grinding of Ti₂AlNb intermetallics using silicon carbide and alumina abrasive wheels: tool surface topology effect on grinding force and ground surface quality. Precison Eng, 2018, 53: 134-145

[8] Xi XX, Ding WF, Fu YC, et al. Grindability evaluation and tool wear during grinding of Ti₂AlNb intermetallics. Int J Adv Manuf Technol, 2018, 94: 1441-1450

[9] Xia ZW, Gao GF, Wang Y, et al. Surface micro-texture and tribological properties in longitudinal-torsional ultrasonic-assisted milling Ti₂AlNb. Int J Adv Manuf Technol, 2023, 126: 1919-1935

[10] Salur E. Understandings the tribological mechanism of Inconel 718 alloy machined under different cooling/lubrication conditions. Tribol Int, 2022, 174: 107677

[11] Shokrani A, Al-Samarrai I, Newman ST. Hybrid cryogenic MQL for improving tool life in machining of Ti-6Al-4V titanium alloy. J Manuf Process, 2019, 43: 229-243

[12] Ma Z, Xu XW, Huang XH, et al. Cutting performance and tool wear of SiAlON and TiC-whisker-reinforced Si₃N₄ ceramic tools in side milling Inconel 718. Ceram Int, 2022, 48: 3096-3108

[13] Yuan ZJ, Gao GF, Wang Y, et al. Experimental study on a two-dimensional ultrasonic vibration platform and milling of Ti₂AlNb intermetallic alloy. Int J Adv Manuf Technol, 2022, 121: 4187-4208

[14] Liu J, Chen GJ, Zhao LX, et al. Research status and development trend of cutting surface integrity of aerospace alloy materials. Int J Adv Manuf Technol, 2023, 127: 45-63

[15] Chen HT, Liu ZB, Wang XB, et al. Effect of surface integrity on fatigue life of 2024 aluminum alloy subjected to turning. J Manuf Process, 2022, 83: 650-666

[16] Liao ZR, Monaca A, Murray J, et al. Surface integrity in metal machining—Part I: fundamentals of surface characteristics and formation mechanisms. Int J Mach Tools Manuf, 2021, 162: 103687

[17] Ross NS, Srinivasan N, Ananth MBJ, et al. Performance assessment of different cooling conditions in improving the machining and tribological characteristics of additively manufactured Al–Si–10Mg alloy. Tribol Int, 2023, 186: 108631

[18] Yin XM, Liu YH, Zhao SC, et al. Tool wear and its effect on the surface integrity and fatigue behavior in high-speed ultrasonic peening milling of Inconel 718. Tribol Int, 2023, 178: 108070

[19] Race A, Zwierzak I, Secker J, et al. Environmentally sustainable cooling strategies in milling of SA516: effects on surface integrity of dry, flood and MQL machining. J Clean Prod, 2021, 288: 125580

[20] Oliveira ARF, da Silva LRR, Baldin V, et al. Effect of tool wear on the surface integrity of Inconel 718 in face milling with cemented carbide tools. Wear, 2021, 476: 203752

[21] Wang YS, Zou B, Wang JC, et al. Effect of the progressive tool wear on surface topography and chip formation in micro-milling of Ti-6Al-4V using TiT_i(C₇N₃-based cermet micro-mill. Tribol Int, 2020, 141: 105900

[22] Liu QM, Xu JK, Yu HD, et al. Experimental study of tool wear and its effects on cutting process of ultrasonic-assisted milling of Ti-6Al-4V. Int J Adv Manuf Technol, 2020, 108: 2917-2928

[23] Wang ZH, Liu YW. Study of surface integrity of milled gamma titanium aluminide. J Manuf Process, 2020, 56: 806-819

[24] Priarone PC, Rizzuti S, Rotella G, et al. Tool wear and surface quality in milling of a gamma-TiAl intermetallic. Int J Adv Manuf Technol, 2012, 61: 25-33

[25] Klocke F, Settineri L, Lung D, et al. High performance cutting of gamma titanium aluminides: influence of lubricoolant strategy on tool wear and surface integrity. Wear, 2013, 302: 1136-1144

[26] Priarone PC, Rizzuti S, Settineri L, et al. Effects of cutting angle, edge preparation, and nano-structured coating on milling performance of a gamma titanium aluminide. J Mater Process Technol, 2012, 212: 2619-2628

[27] Hussain A, Layegh SE, Lazoglu I, et al. Mechanics of milling 48-2-2 gamma titanium aluminide. CIRP J Manufact Sci Technol, 2020, 30: 131-139

[28] Hood R, Aspinwall DK, Soo SL, et al. Workpiece surface integrity when slot milling γ-TiAl intermetallic alloy. CIRP Ann Manuf Technol, 2014, 63: 53-56

[29] Hood R, Aspinwall DK, Sage C, et al. High speed ball nose end milling of γ-TiAl alloys. Intermetallics, 2013, 32: 284-291

[30] Ren JX, Zhai ZY, Shi KN, et al. Tool determination and geometry parameter optimization of carbide tool in high-speed milling of third-generation γ-TiAl alloy. J Braz Soc Mech Sci Eng, 2018, 40: 491

[31] Liang XL, Zhang CB, Wang CJ et al (2023) Tool wear mechanisms and surface quality assessment during micro-milling of high entropy alloy FeCoNiCrAl _x. Tribol Int 178:108053. https://doi.org/10.1016/j.triboint.2022.108053

[32] Chen T, Wang YS, Gao WJ, et al. Comparative study on the cutting performance of self-propelled rotary cutters and indexable cutters in milling TC11 titanium alloy. Int J Adv Manuf Technol, 2020, 111: 2749-2758

[33] Chaus AS, Sitkevich MV, Pokorný P et al (2021) Wear resistance and cutting performance of high-speed steel ball nose end mills related to the initial state of tool surface. Wear 472/473:203711. https://doi.org/10.1016/j.wear.2021.203711

[34] Chen T, Liu JQ, Liu G, et al. Experimental study on titanium alloy cutting property and wear mechanism with circular-arc milling cutters. Chin J Mech Eng, 2023, 36: 1-11

[35] Wang FZ, Ji KX, Guo ZY (2020) Microstructural analysis of failure progression for coated carbide tools during high-speed milling of Ti-6Al-4V. Wear 456/457:203356. https://doi.org/10.1016/j.wear.2020.203356

[36] Jiang EL, Huang LK, Jiang F. Research on the tool wear mechanism of the wave-edge end mill based on the tool-chip contact analysis. Int J Adv Manuf Technol, 2020, 108: 801-808

[37] Gdula M, Mrówka-Nowotnik G. Analysis of tool wear, chip and machined surface morphology in multi-axis milling process of Ni-based superalloy using the torus milling cutter. Wear, 2023, 520/521: 204652

Funding

National Natural Science Foundation of China(92160301)

Science Center for Gas Turbine Project(P2022-AB-IV-002-001)

Natural Science Foundation of Jiangsu Province(BK20210295)

Superior Postdoctoral Project of Jiangsu Province(2022ZB215)

National Key Laboratory of Science and Technology on Helicopter Transmission(HTL-A-22G12)

Postgraduate Research & Practice Innovation Program of Jiangsu Province(KYCX22_0342)