TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were inve...TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were investigated. The microstructure of cladding layer was mainly hypoeutectic. The primary phases were cobalt-rich solid solution. The eutectic phase was composed of cobalt-rich solid solution,Co6W6C and Co Cx. When the boron content increased from 0.2% to 0.5%,the dilution ratio decreased,the primary phase became coarse and the microhardness decreased. When the boron content was from 0.5% to 2%,the dilution ratio and microhardness increased obviously,but the primary phase was refined.The hard phase of Co-8.8 Al-9.8 W became refined and the amount was raised,and the performance of cladding layer was improved with appropriate boron increase.展开更多
In this research, the Co-9Al-7. 5 W superalloy was deposited on the 304 austenite stainless steel plate by tungsten inert gas （T1G） cladding technique. The cladding layer shape, dilution, microharclness, microstruct...In this research, the Co-9Al-7. 5 W superalloy was deposited on the 304 austenite stainless steel plate by tungsten inert gas （T1G） cladding technique. The cladding layer shape, dilution, microharclness, microstructure and distribution of alloying elements were investigated. The cladding layer is characterized by large dilution rate, fine microstructure, narrow heat-affected zone, narrow alloying elements segregation, high hardness, high contents of alloying elements and low contents of Fe.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.51561019)
文摘TIG welding was used to deposit Co-8.8 Al-9.8 W-0.2 B superalloy on 304 austenite stainless steel. The form factor of weld, dilution ratio, microhardness, microstructure and distribution of alloying elements were investigated. The microstructure of cladding layer was mainly hypoeutectic. The primary phases were cobalt-rich solid solution. The eutectic phase was composed of cobalt-rich solid solution,Co6W6C and Co Cx. When the boron content increased from 0.2% to 0.5%,the dilution ratio decreased,the primary phase became coarse and the microhardness decreased. When the boron content was from 0.5% to 2%,the dilution ratio and microhardness increased obviously,but the primary phase was refined.The hard phase of Co-8.8 Al-9.8 W became refined and the amount was raised,and the performance of cladding layer was improved with appropriate boron increase.
基金Acknowledgements This study was financially supported by West Light Foundation of the Chinese Academy of Science （Grant No. 0901ZBB066） , the Natural Science Foundation of Gansu Province （Grant No. 099 RJYA018 ）.
文摘In this research, the Co-9Al-7. 5 W superalloy was deposited on the 304 austenite stainless steel plate by tungsten inert gas （T1G） cladding technique. The cladding layer shape, dilution, microharclness, microstructure and distribution of alloying elements were investigated. The cladding layer is characterized by large dilution rate, fine microstructure, narrow heat-affected zone, narrow alloying elements segregation, high hardness, high contents of alloying elements and low contents of Fe.
