Effects of Ni and Co Additions to Filler Metals on Ag-Brazed Joints of Cemented Carbide and Martensitic Stainless Steel

Kengo Kaiwa; Shinji Yaoita; Tomohiro Sasaki; Takehiko Watanabe

doi:10.4028/www.scientific.net/AMR.922.322

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 922Effects of Ni and Co Additions to Filler Metals on...

Effects of Ni and Co Additions to Filler Metals on Ag-Brazed Joints of Cemented Carbide and Martensitic Stainless Steel

Abstract:

This study focuses on understanding the effect of Ni and Co additions to filler metals on Ag-brazed joints of cemented carbide and martensitic stainless steel. Ni and Co added braze alloys were processed based on Ag-Cu-Zn ternary alloy, and joint strength and microstructure of the brazed layer has been investigated. The joint strength increased by the 2.0mass%Ni and 0.5mass%Co addition into braze alloy. This trend is remarkable in the Co added alloy, and the brazed joint increased by 141% compared to that in no-added alloy. The joint strength was closely related to the suppression effect of Co dissolution from cemented carbide into filler layer and Fe diffusion from the stainless steel to the brazed layer. In the brazed microstructure, Co-depleted zone caused by dissolution of Co in the cemented carbide was observed near the interface between the cemented carbide and the steel. Width of the Co-depleted zone significantly decreased in the Co added alloy. However, the joint strength decreased in the multiple addition compared to that in the single addition of Ni or Co.

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Periodical:

Advanced Materials Research (Volume 922)

Pages:

322-327

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.922.322

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Online since:

May 2014

Authors:

Kengo Kaiwa*, Shinji Yaoita, Tomohiro Sasaki, Takehiko Watanabe

Keywords:

Ag-Based Brazing Filler Metal, Brazing, Cemented Carbide, Co Element Addition, Martensitic Stainless Steel, Ni Element Addition, Tensile Strength

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