Effect of Tin Content on the Microstructure and Property of Brazed WC-Co/CrMo Alloy Steel Joints

Hsin Fu Wang; Liu Ho Chiu; Heng Chang

doi:10.4028/www.scientific.net/AMR.47-50.596

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 47-50Effect of Tin Content on the Microstructure and...

Effect of Tin Content on the Microstructure and Property of Brazed WC-Co/CrMo Alloy Steel Joints

Abstract:

Vacuum brazing of Cemented Tungsten Carbide (WC-Co) and JIS SCM440 steel using Cu-Sn braze alloy has been studied. The effect of Sn content in the filler metals on the properties of brazed joints was investigated. The specimens were brazed under 1050°C to 1110°C for 5 to 15 minutes. The experimental results show that the maximum shear strength is 341±15MPa for the joints brazed at 1080°C for 10 min by using Cu-9Sn filler. Shear strength of the joints brazed at 1050°C and 1080°C increased as Sn content added to the braze alloy. However, joints brazed at 1110°C showed a decline in shear strength as the increase of Sn content. From SEM micrographs, a Fe-Co-Cu alloy layer was formed at WC-Co/Cu-Sn interface and the property of the layer was affected by brazing temperature and Sn content.