王建涛,韩伟,骆合力,李尚平

• 1:钢铁研究总院
• 2:高温合金新材料北京市重点实验室

摘要(Abstract)：

对MX246A合金进行了两段式均匀化热处理,采用扫描电镜观察了均匀化后的微观组织,测试了铸态和均匀化态MX246A合金在850℃和1100℃下的拉伸性能。结果表明,与铸态相比,均匀化热处理后MX246A合金的1100℃的塑性增加,但850℃的塑性降低。均匀化热处理后在枝晶间和晶界处存在大量被γ'包膜包覆的M6C碳化物;拉伸时,裂纹起源于这些碳化物,并沿碳化物与γ'包膜的界面进行扩展。在850℃时γ'包膜韧性差,碳化物处产生的应力集中无法释放是均匀化后MX246A合金的850℃塑性降低的主要原因。

关键词(KeyWords)： Ni3Al;均匀化;微观组织;拉伸

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 王建涛,韩伟,骆合力,李尚平

DOI: 10.13289/j.issn.1009-6264.2014.04.030

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