胡亚美,黄海广,郑必举,史亚鸣,张玉勤,蒋业华

• 1:昆明理工大学材料科学与工程学院
• 2:金属先进凝固成形及装备技术国家地方联合工程实验室
• 3:云南省钛材应用产品工程技术研究中心

摘要(Abstract)：

利用Gleeble-3500热模拟试验机,对电子束冷床熔铸制备的Ti-6Al-4V(TC4)钛合金在变形温度为850～1000℃、应变速率为0.01～1 s~(-1)和总变形量为50%条件下进行多道次热压缩模拟实验,研究铸态合金的多道次压缩热变形行为及微观组织演变规律。结果表明:合金的流变应力随变形温度的升高和应变速率的降低均呈降低趋势;不同变形温度下随应变速率的降低,合金的软化率逐渐升高,且变形温度越高,各道次间软化率趋于稳定;在变形温度950～1000℃、应变速率0.01～0.1 s~(-1)范围内合金的组织均得到不同程度的细化和均匀化,并发生动态回复与再结晶现象,此变形参数下合金的热加工性能稳定,可为电子束冷床熔铸TC4合金的铸态直接多道次热轧成形提供指导。

关键词(KeyWords)： TC4合金;电子束冷床熔铸;多道次热变形;软化机制;微观组织

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFB0301200)

作者(Author): 胡亚美,黄海广,郑必举,史亚鸣,张玉勤,蒋业华

DOI: 10.13289/j.issn.1009-6264.2019-0593

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