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OALib Journal期刊
ISSN: 2333-9721
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生长速度对定向凝固Ti－46Al－2Cr－2Nb合金领先相及微观组织的影响
DOI: 10.3724/SP.J.1037.2013.00398, PP. 1374-1380
Keywords: TiAl合金,定向凝固,领先相,微观组织
Abstract:
采用Birdgman定向凝固系统,在恒定的温度梯度和宽的生长速度范围(v=10－120μm/s),对Ti－46Al－2Cr－2Nb合金进行了定向凝固实验,并对合金的领先相类型、一次枝晶间距(λ1)、二次枝晶间距(λ2)和片层间距(λe)进行分析.结果表明,随着生长速度的增加,试样的领先相由β相转变为α相;通过计算领先相界面温度,发现基于最高界面温度判据的相选择模型能对Ti－46Al－2Cr－2Nb合金领先相随生长速度v的转变趋势进行预测;λ1随v的变化规律受领先相转变影响不大,满足λ1=700.6v-0.24关系;但λ2随v的变化规律受领先相转变影响较大,当领先相为β和α时,分别满足λ2=44.0v-0.10和λ2=57.3v-0.23关系;λe与v之间满足λe=16.4v-0.76关系,不受领先相转变的影响.与TiAl二元合金相比,提高生长速度更有利于Ti－46Al－2Cr－2Nb合金片层细化.
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