Microstructure and Wear Performance of High Volume Fraction Carbide M_7C_3 Reinforced Fe-based Composite Coating Fabricated by Plasma Transferred Arc Welding  

作　　者：袁有录 李铸国 

机构地区：[1]School of Materials Science and Engineering, Hubei University of Automotive Technology [2]Shanghai Key Laboratory of Materials Laser Processing and Modifi cation, School of Materials Science and Engineering, Shanghai Jiaotong University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2014年第5期1028-1035,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Fundation of China(No.51171116);the Ministry of Science and Technology of China(No.2009DFB50350);the Research Foundation of Education Bureau of Hubei Province,China(No.Q20122304);the Foundation of Hubei University of Automotive Technology,China(No.BK201205)

摘　　要：The fabrication of high volume fraction （HVF） M7C3 （M=Cr, Fe） reinforced Fe-based composite coating on ASTM A36 steel plate using plasma transferred arc （PTA） welding was studied. The results showed that the volume fraction of carbide M7C3 was more than sixty percent, and the relative wear resistance of the coating tested on a block-on-ring dry sliding tester at constant load （100 N） and variable loads （from 100 to 300 N） respectively was about 9 and 14 times higher than that of non-reinforced a-Fe coating. In addition, under constant load condition the friction coefficients （FCs） of two coatings increased first and then decreased with increasing sliding distance. However, under variable loads condition the FCs of non-reinforced a-Fe based coating increased gradually, while that of HVF MTC3 reinforced coating decreased as the load exceeded 220 N. The worn surface of non-reinforced a-Fe based coating was easily deformed and grooved, while that of the HVF M7C3 reinforced coating was difficult to be deformed and grooved.The fabrication of high volume fraction （HVF） M7C3 （M=Cr, Fe） reinforced Fe-based composite coating on ASTM A36 steel plate using plasma transferred arc （PTA） welding was studied. The results showed that the volume fraction of carbide M7C3 was more than sixty percent, and the relative wear resistance of the coating tested on a block-on-ring dry sliding tester at constant load （100 N） and variable loads （from 100 to 300 N） respectively was about 9 and 14 times higher than that of non-reinforced a-Fe coating. In addition, under constant load condition the friction coefficients （FCs） of two coatings increased first and then decreased with increasing sliding distance. However, under variable loads condition the FCs of non-reinforced a-Fe based coating increased gradually, while that of HVF MTC3 reinforced coating decreased as the load exceeded 220 N. The worn surface of non-reinforced a-Fe based coating was easily deformed and grooved, while that of the HVF M7C3 reinforced coating was difficult to be deformed and grooved.

关 键 词：high volume fraction M7C3 coatings wear performance PTA welding 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG456.2[金属学及工艺—金属学]