期刊
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
卷 39A, 期 1, 页码 142-149出版社
SPRINGER
DOI: 10.1007/s11661-007-9382-4
关键词
-
In typical braze joints, melting point depressants degrade the structural robustness by concentrating as brittle phases into Continuous seams along the centerline. The objective of the present article is to sufficiently understand the mechanisms governing the microstructure of a typical braze so that approaches for modifying the fabrication to eliminate brittleness can be identified. A characterization conducted for a quaternary braze used for stainless steel bonds, containing P and Si melting point depressants, reveals that the thermochemical interactions governing the microstructure include solution/reprecipitation, solid-state diffusion, and solidification. It is shown that the Si can be incorporated into a solid solution gamma-Ni(Fe, Si) phase that forms by reprecipitation. Moreover, this interaction can suppress the formation of silicides within a permissible braze cycle. However, the P is only diluted through solid-state diffusion into the parent alloy. This happens slowly because of its low solubility rendering it impractical to eliminate the phosphide intermetallic. Approaches that obviate this impediment to joint robustness are described. They involve the spatial disruption of the continuous phosphide-containing, eutectic with a ductile gamma-Ni(Fe, Si) phase.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据