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DZ3合金除去0. 1％Zr显著地减低热裂倾向。这与Zr对合金凝固行为的影响有关。 0. 1％Zr明显地促进γ+γ′共晶的形成,zr偏析形成低熔点的Ni_5Zr相。在凝固过程中富Zr的液膜保持到低于1180℃的温度,结果使合金的凝固范围扩大了80℃。使失去枝晶间补缩的温度与固相线的温度范围扩大了60℃。这是含Zr含金热裂倾向大的原因之一。
DZ3 alloy to remove 0. 1% Zr significantly reduce hot cracking tendency. This is related to the influence of Zr on the solidification behavior of the alloy. 0.1% Zr obviously promote the formation of γ + γ ’eutectic, zr segregation to form a low melting point Ni_5Zr phase. The Zr-rich liquid film remained solidified to a temperature below 1180 ° C, resulting in a solidification of the alloy by 80 ° C. So that the loss of interdendritic shrinkage between the temperature and the solidus temperature range expanded by 60 ℃. This is one of the reasons that the tendency of Zr-bearing hot metal cracking is high.