Effect of calcium on the microstructure and mechanical properties of brazed joint using Ag–Cu–Zn brazing filler metal
Effect of calcium on the microstructure and mechanical properties of brazed joint using Ag–Cu–Zn brazing filler metal
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DOI：
10.1016/j.matdes.2012.11.021
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发表时间：
2013-04
影响因子：
8.4
通讯作者：
Fangfei Sui;W. Long;Shengxin Liu-;Guanxing Zhang;Li Bao;HAO-BO Li;Yong Chen
中科院分区：
文献类型：
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作者：
Fangfei Sui;W. Long;Shengxin Liu-;Guanxing Zhang;Li Bao;HAO-BO Li;Yong Chen
采用不同Ca含量的Ag-Cu-Zn钎料对316LN不锈钢进行感应钎焊，研究了杂质元素Ca对钎焊接头组织和力学性能的影响。结果表明，Ca的加入使合金晶粒粗大，且晶粒分布不规则。Ca含量的增加导致脆性金属间化合物（IMCs）CaCu的形成，这可能导致空洞的形成。所有含钙钎焊接头的显微硬度均优于无钙钎焊接头和含0.003wt.% Ca的显微硬度最高，为203 HV。抗拉强度随Ca含量的增加而降低，从460 MPa降低到400 MPa。粗大晶粒、脆性金属间化合物和空洞的综合作用导致钎焊接头抗拉强度和显微硬度降低。
The induction brazing of 316LN stainless steel using Ag–Cu–Zn filler metal containing various content of Ca was carried out to investigate the influence of impurity element Ca on the microstructure and mechanical properties of the brazed joint. The results showed that Ca additions caused the coarser of the grains and their irregular distribution. Increase of the Ca content resulted in the formations of brittle intermetallic compounds (IMCs) CaCu which perhaps lead to the formations of voids. All of the calcium-containing brazed joints performed better in microhardness than calcium-free ones and brazed joints containing 0.003wt.% Ca showed the highest microhardness of 203HV. While the tensile strength decreased with the increment of Ca, from 460MPa to 400MPa. The combination effects of coarser grains, brittle IMCs and voids conduced to the reduction of tensile strength and microhardness of the brazed joints.