Transactions of Materials and Heat Treatment

Title：Discussion on peak stress model of high strength steel 45K-DDQ when deep drawing

Authors： WANG Li-dong ZHOU Xu-dong

Unit： School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471003 China

KeyWords： deep drawing high strength steel hot deformation peak stress model activation energy

ClassificationCode：TG142.7

year,vol(issue):pagenumber：2012,37(5):150-154

Abstract：

To analyze the effects of different parameters on the flow stress, the single-pass compression experiments were carried out with deep drawing high strength steel 45K-DDQ specimens using a Gleeble1500D thermal simulator at the temperature range of 9501200℃ and strain rate range of 0.01~15s-1 under the condition of maximum deformation of 60%. Considering and combining the characteristics and best application range of the different stress models, the average deformation activation energy under the peak stress and steady-state stress conditions with the regression method were obtained. And they are respectively 318.975kJ·mol-1 and 288.397kJ·mol-1. Finally, the rheological peak stress model was got. The mean relative error is 1.572%, the related coefficient R is 0.9989.

Funds：

Reference：

［1］王利. 汽车用高强度IF薄钢板[J].宝钢技术,1997,(1):58-61.
［2］周纪华,管克智.金属塑性变形阻力[M].北京：机械工业出版社,1989.
［3］王宝景. 340MPa高强IF钢冷轧薄板罩式退火工艺研究[D].北京：北京科技大学,2004.
［4］柳建韬. 工模钢热变形行为研究[D].上海：上海交通大学,1998.
［5］梁桂平, 白星, 李落星, 等. AM80-xSr-yCa镁合金高温压缩变形行为[J].塑性工程学报,2010,17(1):98-103.
［6］宋维锡.金属学[M]. 北京：冶金工业出版社,2005.
［7］曹金荣,刘正东. 应变速率和变形温度对T122耐热钢流变应力和临界动态再结晶行为的影响[J].金属学报,2007, 43(1):35-40.
［8］吴瑞恒.结构钢热变形行为及其铁素体析出动力学数学模型[D].上海：上海交通大学,2002.
［9］Davenport S B, Silk N J, Sellars C M. Development of constitutive equations for modeling of hot rolling[J]］. Journal of Materials Science & Technology, 2000, 16:539-546.
［10］Medina S F, Hernandez C A. General expression of the zener-hollomon parameter as a function of the chemical composition of low alloy and microalloyed steels[J].Acta Materialia,1996,44(1):137-148.
［11］Lin Y C, Chen M S, Zhang J. Study of microstructural evolution during metadynamic recrystallization in a low\|alloy steel[J]. Materials Science and Engineering: A,2009,499:88-92.
［12］蔺永诚,陈明松. 42CrMo 钢的热压缩流变应力行为[J].中南大学学报：自然科学版,2008,39(3):549-553.
［13］骆刚. 42CrMo热塑性流变及动态再结晶行为研究[D].重庆：重庆大学,2010.
［14］王忠堂,张士宏. AZ31镁合金热变形本构方程[J].中国有色金属学报,2008,18(11):1977-1981.

Service：

【This site has not yet opened Download Service】【Add Favorite】