抗高温冲蚀磨损性能
(1. 合肥工业大学 材料科学与工程学院，合肥 230009；2. 浙江大学 材料科学与工程系，杭州 310027；
3. 浙江科得力新材料有限公司，温州 325029)
摘 要: 采用高速电弧喷涂技术在20(AISI 1020)钢基体表面制备FeMnCrAl/Cr3C2涂层，通过光学显微镜(OM)、场发射扫描电镜(FE-SEM)等方法，对FeMnCrAl/Cr3C2涂层显微组织、抗高温冲蚀磨损性能和冲蚀磨损机理进行研究。结果表明：在全部冲击角范围内，FeMnCrAl/Cr3C2涂层表现出优于20钢的抗高温冲蚀磨损性能；FeMnCrAl/Cr3C2涂层的冲蚀磨损机理如下：在低冲击角下，破坏模式以犁耕和切削作用为主；在高冲击角下，破坏模式以挤压疲劳开裂和脱落作用为主；在中间冲击角范围，破坏模式表现为挤压和切削；在全部冲击角下，破坏模式都伴随着新鲜表面在二次冲击下的脆性开裂脱落和过度塑性变形导致疲劳脱落的复合失效形式。
关键字: FeMnCrAl/Cr3C2涂层；高速电弧喷涂；抗高温冲蚀磨损性能；冲蚀磨损机理
FeMnCrAl/Cr3C2 coatings deposited by high velocity arc spraying
（1. College of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. Department of Materials and Science Engineering, Zhejiang University, Hangzhou 310027, China;
3. Zhejiang Cadre New Material Co., Ltd., Wenzhou 325029, China）
Abstract:FeMnCrAl/Cr3C2 coatings were deposited on AISI 1020 steel substrates by high velocity arc spraying. The microstructure, high temperature erosion resistance and erosion mechanism of FeMnCrAl/Cr3C2 coatings were studied using optical microscopy (OM), field emission scanning electron microscopy (FE-SEM). The results show that the FeMnCrAl/Cr3C2 coatings obviously have better erosion resistance than that of AISI 1020 steel substrates. The erosion mechanism of FeMnCrAl/Cr3C2 coatings is that the failure mode is ploughing and cutting at low impact angles, extrusion fatigue cracking and spalling at high impact angles, extruding and cutting at intermediate impact angles, accompanying with brittle cracking and spalling and excessive plastic deformation resulting in fatigue cracking and spalling under secondary impacting of the fresh surfaces at all impact angles.
Key words: FeMnCrAl/Cr3C2 coating; high velocity arc spraying; high temperature erosion resistance; erosion mechanism
