Microstructure, magnetic properties and empirical electron theory calculations of laser cladding FeNiCr/60%WC composite coatings with Mo additions. (January 2016)

• Record Type: Journal Article
• Authors: Yang, Jiaoxi; Miao, Xuanhe; Wang, Xibing; Chen, Hong; Yang, Feng
• Is Part Of: International journal of refractory metals & hard materials. Volume 54(2016:Jan.)
• Page Start: 216
• Page End: 222
• Publication Date: 2016-01
• Subjects: Laser cladding -- Metal–matrix composite -- Tungsten carbide -- Magnetic property -- Mo addition -- EET theory; 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.2015.07.034
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: FeNiCr/60%WC coatings were deposited by laser cladding with direct injection of FeNiCr + 60%WC powder premixed with different amounts of Mo powder (0–4 wt.%) onto the N1310 nonmagnetic steel. The morphology was characterized using a scanning electron microscope (SEM), the phase analysis was performed using an X-ray diffractometer (XRD), and the magnetic properties were examined using a vibrating sample magnetometer (VSM). The empirical electron theory (EET) of solids and molecules was used to calculate magnetic moments of Fe3 W3 C and Ni3 Mo3 C. The relative permeability of FeNiCr/60%WC composite coatings containing different amounts of Mo ranged from 1.008 to 1.052, which was significantly lower than that without Mo addition (1.104). The relative permeability decreased with increasing Mo content until a minimum was reached, and then increased with further increasing Mo content. Ni3 Mo3 C phase was formed initially at high Mo addition (≥ 2.5%) due to the metallurgical reaction between the Mo particles and the Fe-based alloys. Both Ni3 Mo3 C and Fe3 W3 C phases were weakly ferromagnetic with a magnetic moment of 0.6816 and 0.9018 respectively, which seemed to be the main factors affecting the non-magnetic properties of the cladding coatings. Highlights: The FeNiCr/60%WC coatings with different Mo additions were fabricated by laser cladding. The Rietveld quantitative analysis of composite coatings was made. Nonmagnetic properties of the coatings were improved by Mo additions. The magnetic properties and microstructure of the coatings with different Mo additions The magnetic moments of Fe3 W3 C and Ni3 Mo3 C phase were calculated by EET.