Segregation and grain refinement in cast titanium alloys
Segregation and grain refinement in cast titanium alloys
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DOI：
10.1557/jmr.2009.0173
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发表时间：
2009-04-01
影响因子：
2.7
通讯作者：
Dargusch, M. S.
中科院分区：
文献类型：
--
作者：
Bermingham, M. J.;McDonald, S. D.;Dargusch, M. S.
生长限制因子是从二元相图导出的参数，并且是当溶质被添加到基础合金中时晶粒细化响应的有用预测器。这项工作调查的相关性生长限制理论的钛合金的凝固速率是一个数量级快于以前的研究在铝和镁基系统。特别地，研究了Fe和Cr在钛中的偏析，并研究了其对晶粒尺寸的影响。发现Scheil方程合理地模拟了冷却速率接近120摄氏度/秒的钛的凝固，并且Fe和Cr的生长限制因子在预测先前β晶粒细化中是有用的。然而，人们发现，必须谨慎使用时，从二元相图计算生长限制因子。
The growth restriction factor is a parameter derived from binary phase diagrams and is a useful predictor for the grain refining response when a solute is added to a base alloy. This work investigates the relevance of growth restriction theory to titanium alloys where solidification rates are an order of magnitude faster than previous studies in aluminum- and magnesium-based systems. In particular, the segregation of Fe and Cr in titanium is investigated and the effects on grain size studied. It was found that the Scheil equation reasonably modeled solidification of titanium where cooling rates approach 120 degrees C/s, and the growth restriction factors for Fe and Cr were useful in predicting prior-beta grain refinement. However, it was found that caution must be used when calculating growth restriction factors from binary phase diagrams.