感应熔涂温度对FeCoCrNiMoBSi高熵合金涂层抗高温氧化性能的影响  

Effect of induced cladding temperature on high temperature oxidation resistance of FeCoCrNiMoBSi high entropy alloy coating

作　　者：张孝贤 解芳[1,2] 翟长生 刘刚 彭银利 李本 武冰冰 蔡广宇[2] Zhang Xiaoxian;Xie Fang;Zhai Changsheng;Liu Gang;Peng Yinli;Li Ben;Wu Bingbing;Cai Guangyu(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;Yanbai Additive Zhizao(Xuzhou)Technology Co.,Ltd.,Xuzhou Jiangsu 221135,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]岩柏增材智造(徐州)科技有限公司,江苏徐州221135

出　　处：《金属热处理》2023年第6期52-58,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(51605230,52201044,12274245);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)。

摘　　要：为了解决超超临界锅炉管等高温部件在极限高温工况下的氧化问题,探索抗高温氧化FeCoCrNiMoBSi高熵合金涂层制备工艺的可行性。利用火焰热喷涂与感应熔涂相结合的方法,在15CrMo钢基体上采用不同的感应熔涂温度制备了3种FeCoCrNiMoBSi高熵合金涂层,并对3种涂层和基体分别进行高温氧化试验,通过金相观察、XRD、SEM和EDS分析对比涂层氧化前后的物相组成、微观结构和元素组成,分析其高温氧化性能。结果表明,990、1020和1050℃熔涂涂层的氧化动力学曲线均遵循抛物线规律,在900℃氧化120 h后,上述3种涂层的氧化质量增加分别为0.58、0.50和0.54 mg/cm^(2),而基体的氧化质量增加为73.28 mg/cm^(2),约为涂层氧化质量增加的146倍。由此可见涂层的抗高温氧化性远优于基体,其中熔涂温度为1020℃的涂层具备最好的抗氧化性。In order to solve the oxidation problem of ultra-supercritical boiler tubes and other high temperature components under extreme high temperature conditions,the feasibility of the preparation process of high temperature oxidation resistant FeCoCrNiMoBSi high entropy alloy coating was explored.Three kinds of FeCoCrNiMoBSi high entropy alloy coatings were prepared on 15CrMo substrate by flame thermal spraying combined with induction cladding at different temperatures,as well as the high temperature oxidation tests were carried out on the three kinds of coatings and the substrate respectively.The phase composition,microstructure and elemental composition of the coatings before and after oxidation were compared by means of metallographic observation,XRD,SEM and EDS analysis,their high temperature oxidation performance was analyzed.The results show that the oxidation kinetics curves of the coatings claded at 990,1020 and 1050℃all follow the parabola rule.After oxidation at 900℃for 120 h,the oxidation mass gain of the above three coatings is 0.58,0.50 and 0.54 mg/cm^(2)respectively,while the oxidation mass gain of the substrate is 73.28 mg/cm^(2),which is about 146 times of the oxidation mass gain of the coating.It can be seen that the high temperature oxidation resistance of the coating is much better than that of the substrate,and the coating melted at 1020℃has the best oxidation resistance.

关 键 词：感应熔涂 高熵合金涂层 抗高温氧化性 氧化动力学 

分 类 号：TG172[金属学及工艺—金属表面处理]