激光功率对CrCoFeNiMoSi_(1.2)B_(1.1)高熵合金激光熔覆涂层微观组织及耐蚀性的影响  

Effect of laser power on microstructure and corrosion resistance of CrCoFeNiMoSi_(1.2)B_(1.1)high entropy alloy laser clad coating

作　　者：蒋赛男 解芳[1,2,3] 翟长生 张玺 张欣[2,3] Jiang Sainan;Xie Fang;Zhai Changsheng;Zhang Xi;Zhang Xin(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou Henan 450001,China;Engineering Research Center of Additive Manufacturing Aeronautical Materials of Henan Province,Nanyang Institute of Technology,Nanyang Henan 473004,China;Nangyang Key Laboratory of Additive Manufacturing Technology and Equipment,Nanyang Institute of Technology,Nanyang Henan 473004,China;Yanbai Intelligent Additive Manufacturing(Xuzhou)Technology Co.,Ltd.,Xuzhou Jiangsu 221116,China)

机构地区：[1]郑州大学机械与动力工程学院,河南郑州450001 [2]南阳理工学院河南省增材制造航空材料工程研究中心,河南南阳473004 [3]南阳理工学院南阳市增材制造技术与装备重点实验室,河南南阳473004 [4]岩柏增材智造(徐州)科技有限公司,江苏徐州221116

出　　处：《金属热处理》2025年第4期19-27,共9页Heat Treatment of Metals

基　　金：国家自然科学基金(51605230,52371033);河南省重点研发与推广专项(科技攻关)(232102221022);河南省高等学校重点科研项目(21A460021);南阳市基础与前沿技术研究专项(23JCQY1001,23JCQY2013)。

摘　　要：研究了激光功率对CrCoFeNiMoSi_(1.2)B_(1.1)高熵合金(HEA)涂层的显微组织及耐蚀性的影响。结果表明,不同功率下涂层均为单一FCC结构,涂层截面可分为基体、热影响区、熔合区和HEA涂层区,熔合区在激光功率为2600 W时呈致密柱状晶和等轴晶组成的混晶结构,在激光功率为2200 W和3000 W时为细密等轴晶,HEA涂层为枝晶结构,且Mo在枝晶内富集。当激光功率为2600 W时,涂层的FCC相有着更好的结晶度和更少的晶界/晶格缺陷,且具有更低的自腐蚀电流密度(2.40μA/cm^(2)),更高的自腐蚀电位(-0.2760 V),更大的阻抗模值(34713.63Ω·cm^(2))和电荷转移电阻(3.22×104Ω·cm^(2)),表现出更为卓越的电化学腐蚀性能。这可归因于涂层具有更高的结晶度、更少的晶界/晶格缺陷、更致密的结构和钝化膜以及单一FCC固溶相的综合作用。Effect of laser power on microstructure and corrosion resistance of the laser clad CrCoFeNiMoSi_(1.2)B_(1.1)high entropy alloy(HEA)coating was studied.The results show that the coating exhibits single FCC structure under different laser powers.The microstructure in cross section of the coating can be divided into substrate,heat affected zone,fusion zone and HEA zone.The fusion zone is a mixed crystal structure composed of dense columnar crystals and equiaxed crystals when the laser power is 2600 W,while it is a fine equiaxed crystal when the laser power is 2200 W and 3000 W.The HEA coating is dendritic structure and Mo is enriched in dendrites.When the laser power is 2600 W,the FCC phase of the coating has better crystallinity and smaller grain boundaries/lattice defects,lower self-corrosion current density(2.40μA/cm^(2)),more positive self-corrosion potential(-0.2760 V),and larger impedance modulus(34713.63Ω·cm^(2))and the charge transfer resistance(3.22×104Ω·cm^(2)),exhibiting superior electrochemical corrosion performance.This can be attributed to the combined effect of the higher crystallinity,fewer grain boundary/lattice defects,denser structure and passivation film,and a single FCC solid solution phase of the coating.

关 键 词：高熵合金涂层 激光熔覆 微观组织 电化学腐蚀 

分 类 号：TG142.1[一般工业技术—材料科学与工程]