光纤激光氮化处理对TC4合金组织和性能的影响

兰州理工大学学报 ›› 2020, Vol. 46 ›› Issue (4): 10-14.

光纤激光氮化处理对TC4合金组织和性能的影响

顾玉芬, 耿培彪, 石玗, 李广, 郭晋昌

兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室, 甘肃兰州 730050

收稿日期:2019-11-01 出版日期:2020-08-28 发布日期:2020-11-10
作者简介:顾玉芬(1975-),女,甘肃兰州人,副教授.
基金资助:
国家自然科学基金(51765037),甘肃省引导科技创新发展专项基金(2019ZX-08)

Effect of laser power on microstructure and properties of laser nitriding layer of TC4 alloy

GU Yu-fen, GENG Pei-biao, SHI Yu, LI Guang, GUO Jin-chang

State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2019-11-01 Online:2020-08-28 Published:2020-11-10

摘要/Abstract

摘要： 采用高功率光纤激光器在氮气气氛中对TC4钛合金表面进行氮化,制备出渗氮层,并研究了光纤激光功率对TC4钛合金氮化层表面形貌、组织结构以及显微硬度的影响.结果表明:氮化层表面呈现粗糙和光滑两种形貌,氮化层组织为枝晶状组织,热影响区组织为针状组织,当扫描速度为10 mm/s、氮气流量10 L/min、喷嘴距离为3 mm、离焦量为0 mm时,渗氮层的熔深、熔宽均随着激光功率增大而呈现出增大趋势.此外,在距离氮化层表面相同深度的显微硬度随着激光功率增大也呈现出增大趋势.

关键词: TC4钛合金, 激光功率, 渗氮层组织和性能, 渗氮层尺寸

Abstract: The nitrided layer of TC4 titanium alloy was prepared by using IPG high-power fiber laser in nitrogen atmosphere in this study. Effects of optical fiber laser power on surface morphology, microstructure and microhardness of the TC4 titanium alloy nitrided layer were investigated. Obtained results have demonstrated that the surface of the nitrided layer takes rough and smooth of two types. The microstructure of nitrided layer is dendritic, and that of HAZ is needle-like. When scanning speed takes 10 mm/s, the nitrogen flow rate is 10 L/min, the distance of the nozzle is 3 mm and the defocus reaches 0 mm, the penetration depth and width of the nitrided layer increase with the increase of laser power. In addition, the microhardness at the same depth from the surface of the nitrided layer increases with the increase of laser power.

Key words: TC4 alloy, laser power, microstructure and properties of nitriding layer, size of nitriding layer

中图分类号:

TG178

顾玉芬, 耿培彪, 石玗, 李广, 郭晋昌. 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.

GU Yu-fen, GENG Pei-biao, SHI Yu, LI Guang, GUO Jin-chang. Effect of laser power on microstructure and properties of laser nitriding layer of TC4 alloy[J]. Journal of Lanzhou University of Technology, 2020, 46(4): 10-14.

参考文献

[1] 钱九江.航空航天用新型钛合金的研究发展及应用 [J].稀有金属,2000,24(3):218-222.
[2] 尹燕,夏天东,赵文军,等.钛合金／HA涂层新型医用复合材料的制备及研究现状 [J].兰州理工大学学报,2004,30(4):26-30.
[3] 俞树荣,蔡洁琼,何燕妮,等.Ti6Al4V钛合金在粘着作用影响下微动磨损的微裂特征 [J].兰州理工大学学报,2017,43(4):12-15.
[4] 张建斌,余冬梅.钛及钛合金的激光表面处理研究进展 [J].稀有金属材料与工程,2015,44(1):247-254.
[5] POHRELYUK I M,KINDRACHUK M V.Wear resistance of VT22 titanium alloy after nitriding combined with heat treatment [J].Materials Science,2016,52(1):56-61.
[6] 樊丁,戴景杰,孙耀宁,等.工业纯钛TA2的激光气体氮化 [J].兰州理工大学学报,2006,32(3):1-3.
[7] XUE L,ISLAM M,KOUL A K,et al.Laser gas nitriding of Ti-6Al-4V:optimization of the process [J].Advanced Performance Materials,1997,4(1):25-47.
[8] ZHECHEVA A,SHA W,MALINOV S,et al.Enhancing the microstructure and properties of titanium alloys through nitriding and other surface engineering methods [J].Surface and Coatings Technology,2005,200(7):2192-2207.
[9] 程东海,黄继华,林海凡,等.TC4钛合金激光拼焊接头显微组织及力学性能分析 [J].焊接学报,2009,30(2):103-106.
[10] 董丽娜,张建勋.Ti6Al4V激光焊接接头非均匀梯度特征研究现状 [J].稀有金属材料与工程,2013,42(3):655-660.
[11] LISIECKI A.Experimental and numerical study of heat conditions during diode laser gas nitriding of titanium alloy [J].Advanced Materials Research.2014,3483(2072):320-325.
[12] 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.