孙宗帅,齐会萍,宋鑫,赵才,李爽

• 1:太原科技大学材料科学与工程学院
• 2:金属材料成形理论与技术山西省重点实验室

摘要(Abstract)：

对Ti-6Al-4V合金进行了双级退火处理，采用扫描电镜和Gleeble-3500热模拟试验机研究了不同退火温度对合金的微观组织演化和力学性能的影响。结果表明：随着首次退火温度的升高，合金的显微组织中初生α相含量减少，次生α相含量增加，合金的抗拉强度和剪切强度均升高，伸长率和断面收缩率逐渐下降，在1000℃时出现大幅下降。随再次退火温度的升高，组织中等轴α相含量增加，同时片层次生α相发生粗化现象，合金的抗拉强度和剪切强度降低，伸长率和断面收缩率增加。当首次退火温度为950℃时，随着再次退火温度由550℃升高到650℃,合金的伸长率由8.9%增加到12.8%,断面收缩率由26.2%提升到39.5%,随着再次退火温度由650℃升高到700℃,合金的伸长率和断面收缩率无明显提升，抗拉强度和剪切强度下降幅度较大，抗拉强度由1184.6 MPa下降到1089.2 MPa,剪切强度由708.6 MPa下降到678.4 MPa。综合分析可知，经950℃×1 h/WC+650℃×2 h/AC的双级工艺退火后，合金的综合性能最佳。

关键词(KeyWords)： Ti-6Al-4V合金;热处理;塑性;剪切强度;微观组织

Abstract:

Keywords:

基金项目(Foundation): 山西省重点研发计划(202202150401007);; 太原科技大学研究生教育创新项目(SY2023005)

作者(Author): 孙宗帅,齐会萍,宋鑫,赵才,李爽

DOI: 10.13289/j.issn.1009-6264.2024-0044

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