Mechanisms of Macrosegregation Formation near Fusion Boundary in Welds Made with Dissimilar Filler Metals
Mechanisms of Macrosegregation Formation near Fusion Boundary in Welds Made with Dissimilar Filler Metals
复制标题
异种填充金属焊缝熔合边界附近宏观偏析形成机制
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Kou
中科院分区：
文献类型：
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作者：
Y. K. Yang;S. Kou
成分与母材不同的填充金属（称为异种填充金属）通常用于减少裂纹或开发所需的焊接金属性能。使用异种填充金属制成的焊缝（称为异种填充焊缝）可能会发生宏观偏析，并降低焊接质量。即使当异种填充金属与本体焊池完全混合时，宏观偏析也会在熔合边界附近发生。本研究针对这种宏观偏析提出了两种不同的机制。一种机制是 TLW TLB，其中 TLW 是焊缝金属的液相线温度，TLB 是母材金属的液相线温度。这两种不同的机制可能导致两种截然不同的宏观偏析形式。另一方面，使用 TLW TLB 时，会沿着熔合边界形成缺乏填料的滩区，并且该滩区通常是连续的并被焊缝金属侵入。缺乏填料的半岛和岛屿也可能在相对于熔合边界随机方向的焊缝金属侵入之间形成。
Filler metals different from the base metal in composition, called dissimilar filler metals, are often used to reduce cracking or develop desired weld-metal properties. Macrosegregation can occur in welds made with dissimilar filler metals, called dissimilar-filler welds, and degrade the weld quality. Macrosegregation can occur near the fusion boundary even when the dissimilar filler metal mixes completely with the bulk weld pool. Two different mechanisms were proposed in the present study for such macrosegregation. One mechanism is for TLW TLB, where TLW is the liquidus temperature of the weld metal and TLB that of the base metal. These two different mechanisms can result in two distinctly different forms of macrosegregation. With TLW TLB, on the other hand, a filler-deficient beach can form along the fusion boundary and the beach is often continuous and intruded by the weld metal. Filler-deficient peninsulas and islands can also form between weldmetal intrusions in random orientations with respect to the fusion boundary.