熔覆合金层的抗高温氧化性能研究  

Study on High Temperature Oxidation Resistance of Clad Alloy Coating

作　　者：荆博 梁聪 JING Bo;LIANG Cong(School of Metallurgical Engineering,Anhui University of Technology,Ma’anshan Anhui 243002,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243032 [2]上海大学材料科学与工程学院,上海200444

出　　处：《上海金属》2024年第4期28-33,共6页Shanghai Metals

基　　金：国家自然科学基金(51974185)。

摘　　要：用于加热待轧制钢坯或钢锭的炉子的构件长时间暴露在高温及氧化性气氛中,极易因氧化而失效。为延长其使用寿命,采用等离子弧堆焊技术在加热炉构件用铁基合金表面熔覆耐高温氧化的合金层。对熔覆层和基体金属进行了1200℃氧化试验。采用扫描电子显微镜、X射线衍射仪、能谱仪、洛氏硬度计及摩擦磨损试验机等,检测了熔覆层和基体金属高温氧化试验后的形貌、物相、耐磨性及抗氧化性能。结果表明:熔覆合金层的成分均匀,在高温下形成了氧化膜,平均氧化速率为0.455 g/(m^(2)·h),而基体金属试样的平均氧化速率为1.462 g/(m^(2)·h);熔覆层的表面硬度达41.6 HRC,明显高于基体金属的12.2 HRC;熔覆层中Al与FeO形成了高硬度、高耐磨性和高熔点的氧化膜。Components of furnace used for heating billet or ingot to be rolled are exposed to high temperature and oxidizing atmosphere for long time,are extremely easy to fail because of oxidation.To prolong their service life,the high temperature oxidation resistant alloy coating was clad on the surface of Fe-based alloy that was used for the heating furnace components by a plasma arc surfacing technology.Both the clad layer and the base metal were subjected to oxidizing tests at 1200℃ and then were tested for form,phase and oxidation resistance via scanning electron microscope,X-ray diffractometer,energy dispersive spectrometer,Rockwell hardness tester and fraction-wear tester.The results showed that(a)the clad alloy coating exhibited uniform composition,oxide film forming at high temperature,and the average oxidation rate was 0.455 g/(m^(2)·h)for the clad alloy coating and 1.462 g/(m^(2)·h)for the base metal;(b)surface hardness of the clad coating was as high as 41.6 HRC,which was significantly higher than 12.2 HRC of the base metal;and(c)an oxide film formed from Al and FeO in the clad coating,having high hardness,good wear resistance and high melting point.

关 键 词：等离子弧堆焊 高温合金 熔覆层 抗氧化性能 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG178