(1. 北京科技大學(xué) 材料科學(xué)與工程學(xué)院，北京100083； 2. 威海職業(yè)學(xué)院 機(jī)電工程系，威海264210；
3. 濰坊學(xué)院 機(jī)電工程系，濰坊261041； 4. 威海職業(yè)學(xué)院 職業(yè)技能實(shí)訓(xùn)中心，威海264210)
摘 要:
關(guān)鍵字: 埋弧堆焊；TiC顆粒；涂層；原位合成
submerged-arc weld clad TiC particle reinforced composite coating
（1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. Department of Mechanical and Electronic Engineering, Weihai Vocational College, Weihai 264210, China;
3. Department of Mechanical and Electronic Engineering, Weifang University, Weifang 261041, China;
4. Department of Vocational Skills Training Center, Weihai Vocational College, Weihai 264210, China）
Abstract:TiC particle reinforced Fe-based composite coatings were in situ synthesized on the surface of Q235 steel by submerged-arc welding(SAW) using mixture of TiFe, Cr, Ni, Fe and colloidal graphite powers, etc. Microstructures of the coatings were observed by scanning electron microscopy (SEM), the phases in the coatings were determined by X-ray diffractometery (XRD), and the wear resistance of the composite coatings was evaluated under dry sliding wear test conditions at room temperature. The results indicate that the fine TiC particles with diameter less than 2 μm are synthesized by using submerged-arc welding process and distributed in the matrix. The coating consists of TiC particles, martensite and austenite. The microhardness of the coating is 601HV0.2, which is 3 times larger than that of the base material. The wear mass loss of Q235 base material is 10 times more than that of the coating. Compared with the single-layer composite coating, the double composite coating shows better wear resistance due to the increase of austenite and TiC content and the decrease of martensite content.
Key words: submerged-arc welding; TiC; coating layer; in situ synthesis
