The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properti...The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and η phase formed in the joints is M 6C, M 12 C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0.01% in filler material, bend strength σ bb of weld joint is 908 MPa. However, when carbon content increases to 0.41% in filler material, bend strength σ bb is 1 260 MPa.展开更多
The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related ...The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related to Ti or Al content and solidification rate of the alloy. The aggregation of blocky η-phase may remarkably reduce the tensile strength,ductility and rupture life of the alloy.The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lgt for as-cast superalloy.The formation of primary η-phase may be prevented by the reasonable control of Ti or Al content and smelting process.The adoption of treatment under large hot deformation and homogenization may be the remedy for unfavorable influence of η-phase.展开更多
基金Fund from Bureau of Science and Technol-ogy of Dalian City in China( No.2 0 0 114 5 )
文摘The paper studied the effect of Ni-Fe-C filler materials on the η phase formation during TIG welding of WC-30Co and 45 steel. η phase’s morphology and forming condition were discussed using BEI method. The properties of the weld joints were also measured using microhardness measurement and four-point bending measurement. The results show that the weld joints of WC-30Co/45 steel can be obtained by TIG welding using different Ni-Fe-C materials as filler materials, and η phase formed in the joints is M 6C, M 12 C type carbides. The poor carbon content of the W-Co-C system resulted from the C diffusion and the high ingredient Fe are the two vital factors inducing to η phase formation. It can be restricted by the addition of C element into Ni-Fe material. When carbon content is 0.01% in filler material, bend strength σ bb of weld joint is 908 MPa. However, when carbon content increases to 0.41% in filler material, bend strength σ bb is 1 260 MPa.
文摘The precipitation and dissolution together with their control of the primary η-phase in a high-Ti Ni-Fe-Cr base superalloy have been investigated.The precipitation of primary η-phase was found to be closely related to Ti or Al content and solidification rate of the alloy. The aggregation of blocky η-phase may remarkably reduce the tensile strength,ductility and rupture life of the alloy.The temperature-time relation of dissolution of the primary η-phase obeys T=1370-86.1 lgt for as-cast superalloy.The formation of primary η-phase may be prevented by the reasonable control of Ti or Al content and smelting process.The adoption of treatment under large hot deformation and homogenization may be the remedy for unfavorable influence of η-phase.
