Effect of filler metal on microstructure of vacuum brazing YG8/DC53 joint

YUAN Jing; WANG Juan; LI Yajiang

doi:10.7512/j.issn.1001-2303.2020.11.04

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Effect of filler metal on microstructure of vacuum brazing YG8/DC53 joint
Vol. 50, Issue 11, Pages: 16-22(2020)
DOI： 10.7512/j.issn.1001-2303.2020.11.04

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YUAN Jing, WANG Juan, LI Yajiang. Effect of filler metal on microstructure of vacuum brazing YG8/DC53 joint. [J]. 50(11):16-22(2020)
DOI：

YUAN Jing, WANG Juan, LI Yajiang. Effect of filler metal on microstructure of vacuum brazing YG8/DC53 joint. [J]. 50(11):16-22(2020) DOI： 10.7512/j.issn.1001-2303.2020.11.04.

摘要

采用S201铜合金钎料、纯铜钎料和BNi2镍基钎料对YG8硬质合金和DC53钢进行真空钎焊,研究钎料对界面结合、接头组织形貌和显微硬度的影响。结果表明:采用纯铜钎料获得的YG8/DC53接头易出现裂纹,采用BNi2镍基钎料获得的钎缝易形成高硬度脆性相,采用S201铜合金钎料,母材与钎料形成良好的界面结合,靠近硬质合金一侧可以形成Fe-Co基固溶体,钎缝中心主要是Fe-Cu二元相。

Abstract

S201 copper alloy filler metal,pure copper filler metal and BNi2 nickel base filler metal were used for vacuum brazing of YG8 carbide and DC53 steel,and the influence of filler metal on interface bonding, microstructure and microhardness of joints was studied. The results show that the YG8/DC53 joint obtained by using pure copper filler metal is prone to crack, the brazing joint obtained by using BNi2 nickel-based filler metal is easy to form a high hardness brittle phase,the base metal and brazing alloy S201 filler metal are used to form a good interface,the Fe-Co base solid solution can be formed near the cemented carbide side,and the brazing joint center is mainly Fe-Cu binary phase.