Effect of fiber laser line energy on microstructure and properties of in-situ synthesized nitriding layer of Ti6Al4V alloy

Abstract

Abstract: Nitriding layer was in-situ synthesized on the surface of Ti6Al4V alloy by fibre fiber laser in a pure nitrogen atmosphere with different laser line energy. The microstructure and phase composition of the nitriding layers were analyzed. And the effects of line energy on the mechanical properties, wear properties, and corrosion resistance of the nitrided layer were tested. The results showed thatthere is no crack on the surface of the nitrided layerwhen the line energy is 128~180 J/mm, and the main phase is TiN phase, a small amount of α′-Ti phase and TiN_0.3 phase. The nitrided layerhas the highest average hardness of 827.1 HV_0.3 at a line energy of 180 J/mm.The wear rate is 11.6%~59.8 % lower than that of the substrate. In 3.5 wt.% NaCl solution, the corrosion current density of the nitrided layer prepared at the line energy of 128~200 J/mm is lower than that of the substrate,the corrosiona potential is positively shifted by 0.012~0.082 V, and the polarization resistance is increased by 1.6~3.1 times.

Key words: laser line energy, microstructure, mechanical properties, tribological properties, corrosion resistance

CLC Number:

ZHANG Peng-lin, WANG Jia-qi, YU Qi-peng. Effect of fiber laser line energy on microstructure and properties of in-situ synthesized nitriding layer of Ti6Al4V alloy[J]. Journal of Lanzhou University of Technology, 2025, 51(1): 1-10.

References

[1] ZHANG C W,FU T L,CHEN H Y,et al.Microstructure evolution of surface gradient nanocrystalline by shot peening of TA17 titanium alloy[J].Metal Mater Trans A,2021,52:1790-1798.
[2] CUDDIHY M A,STAPLETON A,WILLIAMS S,et al.On cold dwell facet fatigue in titanium alloy aero-engine components[J].International Journal of Fatigue,2017,97:177-189.
[3] WU Z H,KOU H C,CHEN N N,et al.Recent developments in cold dwell fatigue of titanium alloys for aero-engine applications:a review[J].Journal of Materials Research and Technology,2022,20:469-484.
[4] PHILIP J T,MATHEW J,KURIACHEN B.Tribology of Ti6Al4V:a review[J].Friction,2019,7(6):497-536.
[5] WANG J,MA J,HUANG W,et al.The investigation of the structures and tribological properties of F-DLC coatings deposited on Ti-6Al-4V alloys[J].Surface and Coatings Technology,2017,316:22-29.
[6] DIN S H,SHAH M A,SHEIKH N A.Tribological performance of titanium alloy Ti-6Al-4V via CVD-diamond coatings[J].Journal of Superhard Materials,2018,40:26-39.
[7] ZHOU M,XIONG P,JIA Z J,et al.Improved the in vitro cell compatibility and apatite formation of porous Ti6Al4V alloy with magnesium by plasma immersion ion implantation[J].Materials Letters,2017,202:9-12.
[8] KAMAT A M,COPLEY S M,SEGALL A E,et al.Laser-sustained plasma (LSP) nitriding of titanium:a review[J].Coatings,2019,9(5):283.
[9] 顾玉芬,耿培彪,石玗,等.光纤激光氮化处理对TC4合金组织和性能的影响[J].兰州理工大学学报,2020,46(4):10-14.
[10] GU Y F,DUAN X Q,XU Y W,et al.Preparation of ultra-thick,crack-free,titanium nitride coatings using a full-domain power-modulated laser[J].Journal of Manufacturing Processes,2024,113:346-359.
[11] MRIDHA S,BAKER T N.Characteristic features of laser-nitrided surfaces of two titanium alloys[J].Materials Science and Engineering A,1991,142:115-124.
[12] MRIDHA S,BAKER T N.Crack-free hard surfaces produced by laser nitriding of commercial purity titanium[J].Materials Science and Engineering A,1994,188(1/2):229-239.
[13] XUE L,ISLAM M,KOUL A K,et al.Laser gas nitriding of Ti-6Al-4V part 1:Optimization of the process[J].Advanced Performance Materials,1997,4(1):25-47.
[14] TIAN Y S,ZHANG Q Y,QIN C P,et al.Effect of laser scanning speed on nitrided layers fabricated on titanium alloy[J].Surface Engineering,2011,27(6):424-427.
[15] CHEN Z L,WANG Z G,LIU J Q,et al.Enhancing the tribological properties of TA1 pure titanium by modulating the energy of pulsed laser nitriding[J].Optics and Laser Technology,2024,169:110118.
[16] ADDANKI S,AMIRI I S,YUPAPIN P.Review of optical fibers-introduction and applications in fiber lasers[J].Results in Physics,2018,10:743-750.
[17] KAMAT A M,COPLEY S M,TODD J A.Effect of processing parameters on microstructure during laser-sustained plasma (LSP) nitriding of commercially-pure titanium[J].Acta Materialia,2016,107:72-82.
[18] GUO J C,SHI Y,GENG P B,et al.The surface morphology of a Ti-6Al-4V fiber-lasered nitride layer[J].Coatings,2020,10(5):451.
[19] 曹丽琴,孙利娜,轩福贞,等.激光辅助氮化工艺中的开裂行为研究[J].表面技术,2013,42(6):1-5,36.
[20] MOHSENI H,NANDWANA P,TSOI A,et al.In situ nitrided titanium alloys:Microstructural evolution during solidification and wear[J].Acta Materialia,2015,83:61-74.
[21] 高凤琴,李文生,武彦荣,等.Ti-6Al-4V合金光纤激光改性层摩擦学性能与腐蚀行为[J].中国有色金属学报,2020,30(12):2832-2844.
[22] HSIEH J H,WU W,LI C,et al.Deposition and characterization of Ti(C,N,O) coatings by unbalanced magnetron sputtering[J].Surface and Coatings Technology,2003,163-164:233-237.
[23] LIN Y C,CHEN H M,CHEN Y C.The effect of different methods to add nitrogen to titanium alloys on the properties of titanium nitride clad layers[J].Materials and Design,2014,54:222-229.
[24] 姚小春,石玗,李廷取,等.钛合金激光表面氮化层成形特征及分析[J].稀有金属材料与工程,2019,48(12):4060-4067.
[25] XUAN F Z,CAO L Q,WANG Z D,et al.Mass transport in laser surface nitriding involving the secondary effect of high temperature gradient:Simulation and experiment[J].Computational Materials Science,2010,49:104-111.
[26] 李文生,高凤琴,武彦荣,等.半导体激光热输入对渗氮层结构和性能的影响[J].表面技术,2019,48(10):116-124.
[27] 郭士锐,郭小锋,易云杰,等.钛合金表面半导体激光气体氮化涂层的性能研究[J].表面技术,2016,45(9):201-206.
[28] ZHANG P L,CHENG Q Q,YI G W,et al.The microstructures and mechanical properties of martensite Ti and TiN phases in a Ti6Al4V laser-assisted nitriding layer[J].Materials Characterization,2021,178:111262.
[29] YU H J,TAN T Y,WU W.Molecular dynamics study of laser and plasma nitriding of titanium[J].Journal of Manufacturing Science and Engineering,2013,135(3):4501-4504.
[30] LI M K,HUANG K P,YI X M.Crack formation mechanisms and control methods of laser cladding coatings:a review[J].Coatings,2023,13(6):1117.
[31] CUI Z D,ZHU S L,MAN H C,et al.Microstructure and wear performance of gradient Ti/TiN metal matrix composite coating synthesized using a gas nitriding technology[J].Surface and Coatings Technology,2005,190(2):309-313.
[32] KATO K.Wear in relation to friction-A review[J].Wear,2000,241(2):151-157.
[33] ASHASSI S H,SEIFZADEH D,HOSSEINI M G.EN,EIS and polarization studies to evaluate the inhibition effect of 3H-phenothiazin-3-one,7-dimethylamin on mild steel corrosion in 1M HCl solution[J].Corrosion Science,2008,50(12):3363-3370.
[34] 杨闯,刘静,马亚芹,等.TC4钛合金真空渗氮层的耐腐蚀性能[J].材料保护,2015,48(7):60-62.
[35] TIAN H,CHENG X,WANG Y,et al.Effect of Mo on interaction between α/γ phases of duplex stainless steel[J].Electrochimica Acta,2018,267:255-268.
[36] LUO H,WANG X,DONG C,et al.Effect of cold deformation on the corrosion behavior of UNS S31803 duplex stainless steel in simulated concrete pore solution[J].Corrosion Science,2017,124:178-192.