为了提高DD32单晶高温合金过渡液相(TLP)扩散焊接头的力学性能,采用扫描电镜(SEM)和能谱分析仪(EDS)研究接头微观组织, TLP扩散焊过程中基体组织的变化,以及持久过程中基体组织的变化.结果表明,接头由连接区和基体区所组成,未发现明显的扩散区特征.连接区由等温凝固区和残余液相区组成.TLP扩散焊过程对基体组织有重要影响,接头需进行焊后热处理.此外,在持久过程中基体内产生了N型筏.控制TLP扩散焊接头内晶界的形成,可以有效提高接头力学性能.
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