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首页> 外文期刊>ISIJ international >β Grain Refinement due to Small Amounts of Yttrium Addition in α+β Type Titanium Alloy, SP-700
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β Grain Refinement due to Small Amounts of Yttrium Addition in α+β Type Titanium Alloy, SP-700

机译：α-β型钛合金SP-700中少量的钇使β晶粒细化

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摘要

The effect of small amounts of yttrium addition on refinement of β grain size and grain growth behavior in SP-700 alloy with Ti-4.5%Al-3%V-2%Fe-2%Mo was investigated in the temperature region from 1 223 to 1 573 K. Yttrium and oxygen contents in yttrium-added alloys were varied from 0.007 to 0.070% and 0.017 to 0.086%, respectively. Such a small amount of yttrium addition as 0.007% resulted in marked β grain refinement. Variation of β grain size with the heating temperature exhibited rapid grain growth at the particular temperature, which became higher with the increase of yttrium or oxygen content in alloys. It was confirmed that β grain refinement and grain growth behavior with the heating temperature in yttrium-added alloys were brought about by fine precipitates of yttria and dissolution of these precipitates into the β matrix at the higher temperature. TEM and SEM observations of yttrium-added alloys revealed the cubic shape of yttria precipitates with the size of 0.1 to 0.2 μm, and this range of the precipitate's size was well fitted to results analyzed by modified Zener' model for pinning of grain boundary due to a fine particle. Based on assumption that the onset temperature of rapid grain growth corresponds to the re-dissolution temperature of yttria into the β phase, solubility product of Y_2O_3 in reaction of 2Y+3O←→Y_2O_3 was obtained in use of data of variation of the onset temperature of rapid grain growth with yttrium and oxygen contents in alloys. It was also confirmed that yttria powder could be used as an alloying additive of yttrium in melting of yttrium-added alloys.
机译：在1,223的温度范围内，研究了少量钇添加对Ti-4.5％Al-3％V-2％Fe-2％Mo的SP-700合金β晶粒细化和晶粒生长行为的影响。至1 573K。添加钇的合金中的钇和氧含量分别为0.007至0.070％和0.017至0.086％。 0.007％的少量钇添加导致明显的β晶粒细化。 β晶粒尺寸随加热温度的变化在特定温度下表现出快速的晶粒长大，随着合金中钇或氧含量的增加，晶粒长大。可以证实，在钇添加合金中，β晶粒细化和随加热温度的晶粒生长行为是由氧化钇的细小析出物和在较高温度下这些析出物溶解到β基体中引起的。钇合金的TEM和SEM观察表明，氧化钇析出物的立方形状为0.1至0.2μm，并且该析出物大小的范围非常适合修正的Zener模型分析的结果，这是由于细颗粒。基于晶粒快速生长的起始温度对应于氧化钇再溶解到β相中的假设，利用起始温度变化数据获得了Y_2O_3在2Y + 3O←→Y_2O_3反应中的溶解度积合金中钇和氧含量的快速晶粒增长还证实氧化钇粉末可以在添加钇的合金的熔化中用作钇的合金添加剂。

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