李永亮,王福明,李长荣,杨占兵,曹瑞芳,郑亚旭,何煜天

• 1:北京科技大学冶金与生态工程学院
• 2:北京科技大学材料科学与工程学院
• 3:首钢股份公司迁安钢铁公司

摘要(Abstract)：

利用Gleeble-3500热模拟试验机进行双道次压缩试验,研究了Ti对700 MPa级高强度汽车大梁钢静态软化行为的影响。通过测量不同温度和不同道次间隔时间的"应力-应变"曲线,计算出了相同条件下无Ti钢和含Ti钢的再结晶体积分数。结果表明,Ti的添加不仅可以在高温下阻碍等轴晶粒的长大,而且能够抑制形变奥氏体的静态再结晶行为,降低静态软化率。添加0.04%Ti后,静态再结晶激活能由260 kJ·mol~(-1)提高至321 kJ·mol~(-1)。静态再结晶激活能的提高归因于含Ti钢中形成的(Ti,Nb)(C,N)等析出相在高温度下对晶界迁移的阻碍。

关键词(KeyWords)： 汽车大梁钢;静态再结晶;激活能;析出相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51174020,51374018);; 国家高技术研究发展计划资助项目(2013AA031601)

作者(Author): 李永亮,王福明,李长荣,杨占兵,曹瑞芳,郑亚旭,何煜天

DOI: 10.13289/j.issn.1009-6264.2016.10.025

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