抗高溫沖蝕磨損性能
(1. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009；2. 浙江大學(xué) 材料科學(xué)與工程系，杭州 310027；
3. 浙江科得力新材料有限公司，溫州 325029)
摘 要: 采用高速電弧噴涂技術(shù)在20(AISI 1020)鋼基體表面制備FeMnCrAl/Cr3C2涂層，通過(guò)光學(xué)顯微鏡(OM)、場(chǎng)發(fā)射掃描電鏡(FE-SEM)等方法，對(duì)FeMnCrAl/Cr3C2涂層顯微組織、抗高溫沖蝕磨損性能和沖蝕磨損機(jī)理進(jìn)行研究。結(jié)果表明：在全部沖擊角范圍內(nèi)，F(xiàn)eMnCrAl/Cr3C2涂層表現(xiàn)出優(yōu)于20鋼的抗高溫沖蝕磨損性能；FeMnCrAl/Cr3C2涂層的沖蝕磨損機(jī)理如下：在低沖擊角下，破壞模式以犁耕和切削作用為主；在高沖擊角下，破壞模式以擠壓疲勞開(kāi)裂和脫落作用為主；在中間沖擊角范圍，破壞模式表現(xiàn)為擠壓和切削；在全部沖擊角下，破壞模式都伴隨著新鮮表面在二次沖擊下的脆性開(kāi)裂脫落和過(guò)度塑性變形導(dǎo)致疲勞脫落的復(fù)合失效形式。
關(guān)鍵字: FeMnCrAl/Cr3C2涂層；高速電弧噴涂；抗高溫沖蝕磨損性能；沖蝕磨損機(jī)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
