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OALib Journal期刊
ISSN: 2333-9721
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Ti－43Al－9V－Y合金的高温变形行为研究
DOI: 10.3724/SP.J.1037.2013.00513, PP. 1363-1368
Keywords: TiAl合金,高温变形,热压缩,加工图,动态再结晶
Abstract:
采用Gleeble－1500D热压缩模拟试验机研究了铸态Ti－43Al－9V－Y合金在1100－-1225℃,应变速率0.01－1.0s-1条件下的高温变形行为.根据测得的真应力－真应变曲线,基于动态材料模型(DMM)建立了Ti－43Al－9V－Y合金的热加工图.结果表明,在高应变速率区,合金易发生楔形开裂;在1150℃,0.01s-1条件下,合金发生了α+β+γ→β+γ相变;在1200－1225℃,0.01－0.05s-1条件下,合金发生了动态再结晶,具有一定的超塑性,组织为均匀细小的γ晶粒,此时最适于进行热加工.研究发现,1225℃处于α单相区,高温无序α相良好的变形能力是改善合金热加工性能的主要原因.锻造后的合金同时具有良好的断裂韧性和室温塑性.在室温下,Ti－43Al－9V－Y合金中的B2相可以起到阻碍裂纹扩展的作用,而不降低合金的塑性.
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