Metall. Res. Technol.
Volume 117, Number 4, 2020
|Number of page(s)||5|
|Published online||25 June 2020|
Aging-induced formation of the nano-sized clustered carbides in the weld metal of Co-based alloy/AISI 410 stainless steel dissimilar welded joint
Center for Advanced Solidification Technology (CAST), School of Materials Science and Engineering, Shanghai University,
200444, PR China
Accepted: 2 June 2020
The microstructure evolution in Co-based alloy/AISI 410 stainless steel dissimilar welded joints by aging at 566 °C for 200, 400, 600, and 800 h was systematically investigated. In particular, the specimen aging treated for 800 h was emphasized in the present study for its nano-sized clustered characteristic microstructure. The results showed that the microstructure of the weld metal (WM) was mainly γ-Co matrix with dendritic morphology. Before aging treatment, the elements Cr and W segregated slightly in the interdendritic regions. Nevertheless, a large amount of nano-sized clustered carbides rich in elements Cr and W precipitated along grain boundaries after aging treatment. The element segregation during solidification and element diffusion under high-temperature condition could trigger the carbide formation. Though the precipitated carbides revealed a negligible influence on the microhardness of weld (∼ 275 HV), yet a stable performance under high-temperature condition was anticipated for this weldment considering the grain boundary strengthening effect of the nano-sized carbides.
Key words: aging treatment / nano-sized carbide / dissimilar welded joint / Co-based alloy / AISI 410 stainless steel
© EDP Sciences, 2020
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