Effect of Mo content on microstructure and Wear resistance of Mo-Fe-B claddings. (June 2019)

• Record Type: Journal Article
• Authors: Jin, Jun; Sun, Junsheng; Wang, Guangle
• Is Part Of: International journal of refractory metals & hard materials. Volume 81(2019)
• Page Start: 233
• Page End: 241
• Publication Date: 2019-06
• Subjects: Mo2FeB2 -- Mo content -- Microstructure -- Thermodynamic calculations -- Wear resistance; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2019.02.028
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Mo-Fe-B alloy powder blocks were designed and prepared to produce claddings with Mo2 FeB2 phase on Q235 steel using an argon arc welding process. The effects of Mo content on microstructure, phase chemistry, microhardness and wear resistance of claddings were systematically studied. In addition, the formation conditions of hard phase were theoretically analyzed by thermodynamic calculations. The results showed that the claddings consisted of Mo2 FeB2, Cr2 B3, MoB and FeCr. Additionally, calculated results revealed that the Mo2 FeB2 can stably exist in the high- temperature liquid phase and has good thermodynamic stability. Moreover, the maximum microhardness value of claddings was about 1052 HV0.5 .The claddings with 30% and 25% Mo contents had better wear resistance. Highlights: The Mo content had a large influence on the microstructure of claddings. When the Mo contents are 30% and 25%, in addition to the main Mo2 FeB2 hard phase and FeCr solid solution, there were a small number of binary borides such as Cr2 B3 and MoB in the claddings. Meanwhile, when the Mo content was <20%, there was no obvious hard phase formation in the claddings. Thermodynamic calculation revealed that the Mo2 FeB2 can stably exist in the high- temperature liquid phase and has good thermodynamic stability. The maximum microhardness value of claddings was about 1052 HV0.5. The claddings with 30% and 25% Mo contents had better wear resistance.