李俊儒,宋明强,张朝磊,佐辉,钱才让,刘雅政

• 1:北京科技大学材料科学与工程学院
• 2:西宁特殊钢股份有限公司

摘要(Abstract)：

利用Gleeble-1500热模拟实验机进行压缩实验,研究了KT5331钢变形温度为850~1200℃,应变速率为0.01~12 s-1条件下的热变形行为。结果表明,随变形温度升高、应变速率降低,动态再结晶越容易发生,再结晶晶粒尺寸增加,完全动态再结晶温度约为1100℃。完全动态再结晶温度以下,随变形温度升高和应变速率降低,动态再结晶晶粒体积分数增加;完全动态再结晶温度以上,在低应变速率下,经60%压缩变形后,出现混晶形貌,应变速率较高时为等轴晶。通过拟合得到热变形激活能Q为436.541 k J/mol,建立了热变形双曲正弦本构方程,εexp(436541/RT)=6.12×101 5[sinh(0.009344σp)]4.739,具有较高预测精度,根据模型计算所得预测值与实验值之间的平均相对误差为5.9%。

关键词(KeyWords)： KT5331钢;热变形;动态再结晶;本构方程

Abstract:

Keywords:

基金项目(Foundation): 国家“十二五”863计划资助项目(2012AA03A502)

作者(Author): 李俊儒,宋明强,张朝磊,佐辉,钱才让,刘雅政

DOI: 10.13289/j.issn.1009-6264.2015.08.021

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