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Xu Peiquan
Yao Shun
School of Material Science & Engineering,
Shanghai Jiaotong University,
Shanghai 200030, China
Zhao Xiujuan
Yang Dexin
Chen Chunhuan
School of Material Science & Engineering,
Dalian Railway Institute,
Dalian 116028, China
Wang Qingzhang
Welding Technology Institute,
Dalian Heavy-industry Group Co. Ltd.,
Dalian 116022, China |
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Ni-Fe-C ALLOY EFFECT ON
η PHASE FORMED DURING TIG WELDING OF WC-Co WITH 45 STEEL*
Abstract: Ni-Fe-C filler metal based on WC-30Co/Ni-Fe-C/45 steel is developed using TIG welding method. The weld joints are studied by means of optical microscope, SEM, EPMA, X-rays and micro hardness test etc. The results show that the weld joints of WC-30Co and 45 steel can be obtained by TIG welding using Ni-Fe-C alloys as filler metals. The harmful η phase formed in the joints is M6C, M12C type carbides. The poor carbon content of the W-Co-C system resulted from the carbon diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It could be restricted by the addition of carbon element into Ni-Fe alloys.
Key words:
WC-30Co cemented carbide Ni-Fe-C alloys TIG welding η phase |