郝勇飞,成国光,谢有

• 1:北京科技大学钢铁冶金新技术国家重点实验室

摘要(Abstract)：

对含铌0.051%的H13钢铸锭中一次碳氮化物成分特征及在1150℃、1250℃下的热稳定性进行了分析,并利用热力学软件Thermo-Calc对其形成机制进行了合理的解释。研究发现含铌0.051%的H13钢铸锭中存在3类一次碳氮化物,富Nb类、富V类以及富Mo-Cr类相。富Nb相热稳定性高,在1150℃及1250℃下保温6 h仍大量存在。富V相在1150℃下保温6 h仍然存在,而在1250℃下保温6 h即可完全固溶。富Mo-Cr相热稳定性低,无论是在1150℃还是1250℃下,均没有发现。这些相是在凝固过程中由于元素富集而在液相中析出。凝固过程中,富V的碳氮化物相首先析出,之后随着Nb含量的富集,富Nb的碳化物相开始析出,当Nb元素消耗到一定程度而同时V元素进一步富集后,富V的碳化物相再次析出,富Mo-Cr相在凝固末期最后析出。

关键词(KeyWords)： H13钢;Nb;热稳定性;生成机理;Thermo-Calc

Abstract:

Keywords:

基金项目(Foundation): 高品质特殊钢(863)项目(2012AA03A503)

作者(Author): 郝勇飞,成国光,谢有

DOI: 10.13289/j.issn.1009-6264.2017.04.020

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