摘要
本工作探究了钛合金TA15表面激光熔覆镍基和钴基合金对涂层摩擦磨损性能的影响。采用2 kW光纤激光器,在TA15表面分别制备了Ni60A-50%Cr_(3)C_(2)-1.0%Y 2O 3和Stellite6-5%TA15-2.5%Y 2O 3复合涂层,利用SEM、EDS和XRD分析涂层的组织和物相,利用显微硬度计测量涂层的硬度,利用MMG-500三体磨损试验机进行摩擦磨损试验。两种涂层和基体均呈良好的冶金结合,镍基涂层主要由γ-(Fe,Ni)、TiC和Cr_(3)C_(2)等相组成,钴基涂层主要由γ-Co、TiC、Co 3Ti和Cr 5Si 3等相组成。镍基涂层结合区组织是平面晶和柱状晶,涂层中部组织是树枝晶和枝晶间的共晶组织,涂层顶部是等轴晶。而钴基涂层结合区组织是平面晶、柱状晶和块状晶,涂层中部是棒状组织和树枝晶,涂层顶部是等轴晶。镍基和钴基涂层显微硬度分别为1209HV_(0.2)和1072HV_(0.2),约为TA15显微硬度(330HV_(0.2))的3.7倍和3.2倍。两种涂层的耐磨损性能均显著提高,但镍基涂层的耐磨效果比钴基涂层更好。
To investigate the effect of laser cladding of nickel-based and cobalt-based alloys on the friction and wear properties of the titanium alloy TA15 surface,a 2 kW fiber laser was used to prepare Ni60A-50%Cr_(3)C_(2)-1.0%Y 2O 3 and Stellite6-5%TA15-2.5%Y 2O 3 composite coatings on the surface of TA15.The coating structure,phase were analyzed by SEM,EDS and XRD.The hardness of the coating was measured by a meter,and the friction and abrasion test was performed by a MMG-500 three-body abrasion tester.Both the coating and the substrate show a good metallurgical bond.Nickel-based coatings are mainly composed ofγ-(Fe,Ni)phase,TiC and Cr_(3)C_(2)phases,and cobalt-based coatings are mainly composed ofγ-Co,TiC,Co 3Ti and Cr 5Si 3 phases.The structure of the bonding zone of the nickle-based coating is planar crystals and columnar,the middle structure of the coating is eutectic structure between dendrites and dendrites,and the top of the coating is equiaxed.The structure of the bonding zone of the cobalt-based coating is planar crystals,columnar crystals,and bulk crystals.The middle part of the coating is rod-shaped and dendritic.The top of the coating is equiaxed.The microhardness of nickel-based and cobalt-based coatings are 1209HV_(0.2)and 1072HV_(0.2),respectively,which are about 3.7 times and 3.2 times the TA15 microhardness(330HV_(0.2)).Both coatings have significantly improved wear resis-tance,but nickel-based coatings have better wear resistance than cobalt-based coatings.
作者
于坤
祁文军
李志勤
YU Kun;QI Wenjun;LI Zhiqin(School of Mechanical Engineering,Xinjiang University,Urumqi 830047,China;Xinjiang Uygur Autonomous Region Office of Defense Science,Technology and Industry,Urumqi 830000,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第6期6135-6139,共5页
Materials Reports
基金
自治区高校科研计划自然科学重点项目(XJEDU2020I007)
国家大学生创新训练计划项目(201910755067)。
关键词
TA15
激光熔覆
镍基涂层
钴基涂层
耐磨性
TA15
laser cladding
nickel-based coating
cobalt-based coating
wear resistance
