孙建亮,张永振,彭艳,戚向东,韩辉

• 1:燕山大学国家冷轧板带装备及工艺工程技术研究中心
• 2:北汽福田汽车股份有限公司

摘要(Abstract)：

根据大型筒节的轧制和轧后冷却模型,模拟大型筒节轧制截面的应变率和轧后冷却速度曲线;结合Gleeble-3800对金属小试样2.25Cr-1Mo-0.25V钢进行了热压缩模拟实验,得出了多道次压缩的流变应力曲线;分析了小试样热变形后不同冷却方式对其组织形貌的影响和对后期正火晶粒细化的作用。结果表明,2.25Cr-1Mo-0.25V钢轧制过程心部大部分区域温度不变;轧制压下率低,心部应变率不足10%;道次间歇时间长,静态软化率高达95%,奥氏体晶粒回复长大;轧后空冷过程心部冷却速度缓慢,冷却后基体主要为粒状珠光体组织,经后期热处理晶粒不易细化,是造成组织遗传的主要原因;增大轧后冷却速度和降低冷却转变温度有利于后期热处理晶粒细化,采用喷淋-空冷联合冷却能充分利用大型筒节的轧后余热,冷却过程热应力较小,有利于促进后期热处理组织细化。

关键词(KeyWords)： 大型筒节;2.25Cr-1Mo-0.25V钢;组织遗传;晶粒细化;联合冷却

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51305388);; 河北省高等学校青年拔尖人才计划项目(BJ2014055);; 国家科技支撑计划资助项目(2011BAF15B01)

作者(Author): 孙建亮,张永振,彭艳,戚向东,韩辉

DOI: 10.13289/j.issn.1009-6264.2015.11.042

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