刘明霞,李昭,畅庚榕,尹志福,张秀萍

• 1:西安文理学院陕西省表面工程与再制造重点实验室
• 2:西安文理学院西安市植入器械成形与优化重点实验室

摘要(Abstract)：

利用高速激光熔覆在2Cr13钢基体表面制备了Ni625合金涂层，并对涂层进行了激光重熔处理。采用粗糙度仪、光学显微镜(OM)、扫描电镜(SEM)、X射线衍射仪(XRD)、X射线残余应力仪、电化学工作站及盐雾试验等分析了激光重熔前后涂层的宏观形貌、微观组织、残余应力及耐蚀性能。结果表明：激光重熔后，涂层表面粗糙度降低到1.76μm,降幅达86%,熔覆层更趋致密且表面平整度提升明显；激光重熔后涂层近表面区域的树枝晶间距减小，晶粒明显细化，重熔后熔覆层中的物相不变，主要由γ-(Ni, Fe)韧性相、Cr_2Ni_3相及少量M_(23)C_6硬质相构成；重熔前后涂层表面均为压应力，重熔态涂层表面的残余压应力水平略有下降；重熔态涂层的自腐蚀电位比基体提高约0.243 V,比熔覆态涂层提高约0.121 V;基体、重熔前后涂层试样的容抗弧半径和阻抗模值依次增大；经过96 h盐雾腐蚀试验后，重熔态涂层的质量损失率与基体和熔覆态涂层相比分别降低了94.1%和66.8%;分析认为重熔态Ni625涂层耐蚀性的提高归因于激光重熔处理后涂层表面致密性的增加和晶粒的细化。

关键词(KeyWords)： 高速激光熔覆;激光重熔;微观组织;晶粒细化;残余应力;耐蚀性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金青年基金项目(52101097);; 陕西省自然科学基础研究计划项目(2022CGBX-13,2021JM-512,2021JQ-797);; 陕西省教育厅科技项目(21JS035);; 西安市科技计划项目(2020KJWL01,21XJZZ0069);; 西安文理学院先进表面工程与装备延寿项目(XAWLKYTD013);; 陕西省表面工程与再制造重点实验室开放基金(tywl2021-2)

作者(Author): 刘明霞,李昭,畅庚榕,尹志福,张秀萍

DOI: 10.13289/j.issn.1009-6264.2022-0025

参考文献(References)：

• [1]刘伟，伏利，陈小明，等．2Cr13不锈钢基体及其表面激光淬火层的组织及性能分析比较[J]．腐蚀与防护，2021,42(10):19-22.LIU Wei,FU Li,CHEN Xiao-ming,et al.Analysis and comparison of microstructure and properties of 2Cr13 stainless steel and its laser hardened layer[J].Corrosion and Protection,2021,42(10):19-22．
• [2]李超，刘佳，贾安．两种喷涂方法在TRT叶片上的对比应用及研究[J]．装备制造技术，2020(1):107-109.LI Chao,LIU Jia,JIA An.Comparative application and research of two spraying methods on TRT blades[J].Equipment Manufacturing Technology,2020(1):107-109．
• [3]李振．叶轮再制造修复用Ni Cr-Cr3C2NiCrAl涂层冲蚀磨损机理研究[D]．济南:山东大学，2019.LI Zhen.Research on erosion wear mechanisms of Ni Cr-Cr3C2NiCrAl coating for impeller remanufacturing[D].Jinan:Shandong University,2019．
• [4]Schopphoven T,Gasser A,Wissenbach K.Investigations on ultra-high-speed laser material deposition as alternative for hard chrome plating and thermal spraying[J].Journal of Laser Applications,2016,28:022501．
• [5]Kelbassa A,Gasser W,Meiners G,et al.High speed LAM[J].International Matador Conference,2013,37:385-390．
• [6]黄旭，张家诚，练国富，等．超高速激光熔覆研究现状及应用[J]．机床与液压，2021,49(6):151-155.HUANG Xu,ZHANG Jia-cheng,LIAN Guo-fu,et al.Research status and application of extreme high speed cladding[J].Machine Tool and Hydraulics,2021,49(6):151-155．
• [7]Li Y J,Dong S Y,Yan S X,et al.Elimination of voids by laser remelting during laser cladding Ni based alloy on gray cast iron[J].Optics and Laser Technology,2019,112:30-38．
• [8]Wang H Z,Cheng Y H,Yang J Y,et al.Influence of laser remelting on organization,mechanical properties and corrosion resistance of Fe-based amorphous composite coating[J].Surface and Coatings Technology,2021,414:127081．
• [9]Zhang D,Qin Y,Feng W,et al.Microstructural evolution of the amorphous layers on Mg-Zn-Ca alloy during laser remelting process[J].Surface and Coatings Technology,2019,363:87-94．
• [10]Vostˇrák M,Tesaˇr J,Houdková?，et al.Diagnostic of laser remelting of HVOF sprayed Stellite coatings using an infrared camera[J].Surface and Coatings Technology,2017,318:360-364．
• [11]Houdková?，Pala Z,SmazalováE,et al.Microstructure and sliding wear properties of HVOF sprayed,laser remelted and laser clad Stellite 6 coatings[J].Surface and Coatings Technology,2017,318:129-141．
• [12]Yang K,Li J Q,Wang Q Y,et al.Effect of laser remelting on microstructure and wear resistance of plasma sprayed Al2O3-40%TiO2coating[J].Wear,2019,426-427:314-318．
• [13]陈正涵，孙晓峰，李占明，等．激光重熔对冷喷涂镍铝青铜涂层组织性能的影响[J]．材料热处理学报，2017,38(8):116-122.CHEN Zheng-han,SUN Xiao-feng,LI Zhan-ming,et al.Effect of laser remelting on microstructure and properties of nickel aluminum bronze coating prepared by cold spraying[J].Transactions of Materials and Heat Treatment,2017,38(8):116-122．
• [14]张曼莉，邱长军，郑文权，等．激光重熔对火焰喷涂Cr Fe Al Ti涂层组织与性能的影响[J]．材料热处理学报，2017,18(6):141-149.ZHANG Man-li,QIU Chang-jun,ZHENG Wen-quan,et al.Influence of laser remelting on microstructure and properties of Cr Fe Al Ti coating by flame spraying[J].Transactions of Materials and Heat Treatment,2017,18(6):141-149．
• [15]Gao W Y,Zhao S S,Wang Y B,et al.Effect of re-melting on the cladding coating of Fe-based composite powder[J].Materials and Design,2014,64:490-496．
• [16]Li R F,Jin Y J,Li Z G,et al.Effect of the remelting scanning speed on the amorphous forming ability of Ni-based alloy using laser cladding plus a laser remelting process[J].Surface and Coatings Technology,2014,259:725-731．
• [17]Xin B,Zhou X X,Cheng G,et al.Microstructure and mechanical properties of thin-wall structure by hybrid laser metal deposition and laser remelting process[J].Optics and Laser Technology,2020,127:106087．
• [18]邓德伟，马云波，马玉山，等．重熔及退火对316L不锈钢激光熔覆层残余应力的影响[J]．金属热处理，2020,45(8):113-118.DENG De-wei,MA Yun-bo,MA Yu-shan,et al.Influence of remelting and annealing on residual stress of 316L stainless steel laser clad layer[J].Heat Treatment of Metals,2020,45(8):113-118．
• [19]娄丽艳，李成新，张煜，等．低功率超高速激光熔覆Fe Cr合金薄涂层微观结构与表面形貌演化[J]．燕山大学学报，2020,44(2):116-124.LOU LI-yan,LI Cheng-xin,ZHANG Yu,et al.Microstructure and surface morphology evolution of Fe Cr alloy thin coatings deposited by ultra-high speed laser cladding with low laser power[J].Journal of Yanshan University,2020,44(2):116-124．
• [20]叶秀，武美萍，缪小进，等．激光重熔对Ti-6Al-4V选区激光熔化成形质量的影响[J]．表面技术，2021,50(8):301-310.YE Xiu,WU Mei-ping,MIAO Xiao-jin,et al.Influence of laser remelting on forming quality of Ti-6Al-4V fabricated by selective laser melting[J].Surface Technology,2021,50(8):301-310．
• [21]Kaierle S,Overmeyer L,Alfred I,et al.Single-crystal turbine blade tip repair by laser cladding and remelting[J].CIRP Journal of Manufacturing Science and Technology,2017,19:196-199．
• [22]Liang R Y,Huang C P,Hao H W,et al.Microstructure and mechanical properties of 34CrNiMo6 steel repaired by laser remelting[J].Journal of Materials Research and Technology,2020,9(6):13870-13878．
• [23]Ferreira A A,Reis A R,Amaral R L,et al.Mechanical and microstructural characterisation of bulk Inconel 625 produced by direct laser deposition[J].Materials Science and Engineering A,2022,838:142777．
• [24]Louren?o J C,Souza L P,Faria M I,et al.Influence of the iron content on the microstructure and electrochemical behavior of as-cast modified Inconel 625[J].Corrosion Science,2021,193:109892．
• [25]Zhang J C,Huang T W,Shen Z L,et al.Enhanced structural refinement on eutectic medium-entropy alloy Cr Co Ni Nb0.48by laser remelting[J].Materials Letters,2021,304:130710.

文章评论(Comment)：