Effect of brazing temperature and holding time on joint properties of induction brazed WC-Co/carbon steel using Ag-based alloy
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- 作者：Chao Jiang ; Hui Chen ; xnrpt@swjtu.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Qiuying Wang ; Yuanxing Li
- 关键词：Induction brazing ; WC-Co/steel joints ; Ag-based alloys ; Dispersion strengthening ; Shear strength
- 刊名：Journal of Materials Processing Technology
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：229
- 期：Complete
- 页码：562-569
- 全文大小：4577 K
文摘
Because of insufficient understanding of the strengthening effect of α-Cu (s.s) in WC-Co/interlayer/35CrMo joints, this research focused on revealing the evolution and strengthening effect of α-Cu (s.s) with brazing temperature and holding time. The joints were performed by high-frequency induction brazing using an Ag-based alloy (Ag-16Cu-23Zn-7.5Mn-4.5Ni, wt.%) as the filler metal. Island-like α-Cu solid solution (s.s) phases widely spread in the filler metal and played a role of dispersion strengthening because of the high hardness. Because of the high affinity between Ni, Co and Fe, α-Cu (s.s) layers formed at the interfaces and strengthened them. The joint strength increased with widening α-Cu (s.s) layers. With increasing brazing temperature and holding time, the total area and number of island-like α-Cu (s.s) phases decreased, contributing to weakening the dispersion strengthening effect. The maximum shear strength of brazed joints was 366 MPa when brazing at 770 °C for 30 s.