田飞,曾卫东,马雄,孙宇,周义刚

• 1:西北工业大学材料学院凝固技术国家重点实验室

摘要(Abstract)：

针对BT25两相钛合金,对比研究了计算法、热膨胀法、差示扫描量热法和连续升温金相法4种方法测定(α+β)/β相变点的一致性问题。计算法根据各合金元素及杂质含量对钛合金相变点的影响值,推算出公式,得出BT25合金的相变点约为1023℃;热膨胀法和差示扫描量热法根据钛合金发生(α+β)→β转变时体积和热量的变化,测得BT25合金的相变点约分别为1029.2和1029.85℃;而连续升温金相法通过观察不同淬火温度的试样在光学显微镜下的显微组织变化,确定升温过程中初生α相完全消失的温度即为相变温度,约为1029℃。结果表明采用计算法、热膨胀法和差示扫描量热法与金相法测定BT25钛合金的(α+β)/β相变点一致,基于多种测定方法的综合运用对于钛合金相变点的准确测定具有重要意义。

关键词(KeyWords)： BT25;相变点;计算法;热膨胀法;差示扫描量热法

Abstract:

Keywords:

基金项目(Foundation): 国家“973”计划(2007CB613807);; 新世纪优秀人才支持计划(NCET-07-0696);; 凝固技术国家重点实验室开放课题(35-TP-2009)

作者(Author): 田飞,曾卫东,马雄,孙宇,周义刚

DOI: 10.13289/j.issn.1009-6264.2011.05.002

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