孙彦辉,赵勇,曾亚南,宋方圆

• 1:北京科技大学钢铁共性技术协同创新中心
• 2:华北理工大学冶金与能源学院

摘要(Abstract)：

通过理论计算和热模拟试验对Nb-V微合金钢的热塑性进行了研究,并考察了微观偏析和析出物粒子对热塑性的影响。结果表明,S、P和O元素偏析主要发生在糊状区(固液两相区),同时树枝晶间Fe(S,O)和(Fe,Mn,Si,Al)(S,O)类夹杂物的形成导致了热塑性恶化。在1000~975℃区间,Nb N粒子直径由20 nm减小到10 nm,粒子数量由23个/μm2上升到45个/μm2,断面收缩率迅速由82.36%下降到69.61%;在900~850℃区间,断面收缩率缓慢下降并伴随有铁素体膜逐渐变厚。温度小于975℃、高临界应力下容易发生晶间断裂,从而产生裂纹源。

关键词(KeyWords)： 溶质偏析;脆性区;低应变速率;析出物;临界应力

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51274032)

作者(Author): 孙彦辉,赵勇,曾亚南,宋方圆

DOI: 10.13289/j.issn.1009-6264.2016.02.022

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