锻压技术

不同应变速率双相高强钢动态力学行为微观机理分析

英文标题：Analysis on micromechanism of dynamic mechanical behavior for highstrength steel with dual phase under different strain rates

作者：李春光张伟刘立现陈庆

单位：东北大学首钢集团有限公司

关键词：应变速率双相高强钢动态力学行为微观机理韧性断裂

分类号：TK6; TG142.1

出版年,卷(期):页码：2018,43(6):166-171

摘要：

采用电液伺服高速拉伸试验机获得双相高强钢DP780D+Z在不同应变速率下的力学性能曲线，结合拉伸断口组织和形貌变化，分析不同应变速率下材料的力学性能及微观组织变化。分析结果可知：低应变速率下，材料的抗拉强度、屈服强度等变化不明显，随着应变速率的增加，力学性能提升明显；当应变速率达到10 s-1后，材料的断后伸长率均出现较大幅度的变化，材料的塑性具有明显的提升；随着应变速率的增加，双相钢内的基体之间的运动阻力增大，表现出材料非均匀塑性变形能力增强；当应变速率比较低时，材料断口表现出非常明显的拉长韧窝特征，随着应变速率的增加，等轴韧窝特性越来越明显，双相钢表现出明显的韧性断裂特征。

The mechanical properties of the doublephase high strength steel DP780D+Z at different strain rates were obtained by the electrohydraulic servo highspeed tensile testing machine, and the mechanical properties and microstructure of material were analyzed by combining the tensile fracture structure and morphological change. The results show that the tensile strength and yield strength of the material do not change obviously at low strain rate, and with the increase of the strain rate, the mechanical properties are improved obviously. When the strain rate reaches 10 s-1, the elongation after fracture changes greatly, and the plasticity of the material increases quickly. Furthermore, with the increase of strain rate, the movement resistance between the matrices in the dualphase steel increases which shows strong nonuniform plastic deformation ability. When the strain rate is relatively low, the material fracture shows a very obvious characteristic of elongated dimple, and with the increase of strain rate, the equiaxial dimple feature is more obviously and the dualphase steel has the ductile fracture obviously.

基金项目：

李春光（1978-），男，博士，高级工程师；Email： llsnmgkj@126.com；通讯作者：张伟（1986-），男，博士，高级工程师；Email: zhangw@shougang.com.cn

参考文献：

［1］董丹阳, 刘杨, 王磊,等. 应变速率对DP780钢动态拉伸变形行为的影响
［J］. 金属学报, 2013, 49(2):159-166.

Dong D Y, Liu Y, Wang L, et al. Effect of strain rate on dynamic deformation behavior of DP780 steel
［J］. Acta Metallurgica Sinica, 2013, 49(2):159-166.

［2］田成达, 李大永, 彭颖红,等. DP780高强钢板动态变形力学行为研究
［J］. 塑性工程学报, 2008, 15(6):102-106.

Tian C D, Li D Y, Peng Y H, et al. Research on the dynamic deformation behavior of the DP780 advanced high strength steel
［J］. Journal of Plasticity Engineering, 2008, 15(6):102-106.

［3］赵辉. 高应变速率下超高强冷轧双相钢的拉伸性能研究
［J］. 铸造技术, 2014,(10):2217-2219.

Zhao H. Tensile properties of ultrahigh strength cold rolled dual phase steel at high strain rate
［J］. Foundry Technology, 2014,(10):2217-2219.

［4］GB/T 30069.2—2016，金属材料高应变速率拉伸试验第2部分：液压伺服型与其他类型试验系统
［S］.

GB/T 30069.2—2016, Metallic materials—Tensile testing at high strain rate—Part 2: Servohydraulic and other test systems
［S］.

［5］陈俊岭, 李哲旭, 舒文雅, 等. 不同应变率下 Q345钢材力学性能试验研究
［J］. 东南大学学报：自然科学版, 2015, 45(6):1145-1150.

Chen J L, Li Z X, Shu W Y, et al. Experimental study on dynamic mechanical behavior of Q345 steel under different strain rates
［J］. Journal of Southeast University: Natural Science, 2015, 45(6):1145-1150.

［6］王云瞾. 应变方式及速率对TRIP780钢板组织与力学性能影响的研究
［D］. 长春：吉林大学, 2016.

Wang Y Z. Research on the Effect of Strain Modes and Strain Rates on Microstructures and Mechanical Properties of TRIP780 Steel Sheet
［D］. Changchun: Jilin University, 2016.

［7］Yin G Q, Huang Z Y, Hui J, et al. Microstructure and mechanical properties of high strength thick wall H-beam steel after controlled rolling and fast cooling
［J］. Heat Treatment of Metals, 2010, 35(5):69-74.

［8］代启锋, 宋仁伯, 蔡恒君,等. 超高强冷轧双相钢DP1000高应变速率下的拉伸性能
［J］. 材料研究学报, 2013, 27(1):25-31.

Dai Q F, Song R B, Cai H J, et al. Tensile mechanical behaviour of ultra-high strength cold rolled dual phase steel DP1000 at high strain rates
［J］. Chinese Journal of Materials Research, 2013, 27(1):25-31.

［9］王文平, 万敏, 吴向东,等. 典型汽车用钢板应变速率敏感性实验
［J］. 塑性工程学报, 2012, 19(6):84-89.

Wang W P, Wang M, Wu X D, et al. Experimental research on strain rate sensitivity of automotive steel sheet
［J］. Journal of Plasticity Engineering, 2012, 19(6):84-89.

［10］徐超, 朱超群, 何燕霖,等. 不同应变速率下DP钢变形行为的微观机理研究
［J］. 上海金属, 2014, 36(3):1-5.

Xu C, Zhu C Q, He Y L, et al. Study on the microscopic deformation mechanism of DP steel at different strain rates
［J］. Shanghai Metals, 2014, 36(3):1-5.

［11］赵茂俞, 陈乾旺, 田春艳. 微观组织对高强度双相钢板冲压回弹影响的研究
［J］. 热加工工艺, 2014, 43(3):94-97.

Zhao M Y, Chen Q W, Tian C Y. Effect of microstructure on stamping springback of high strength dual phase steel
［J］. Hot Working Technology, 2014,43(3):94-97.

［12］祝洪川, 孙宜强, 吴青松. 先进高强钢断裂性能研究
［J］. 锻压技术, 2015, 40(12):115-119.

Zhu H C, Sun Y Q, Wu Q S. Study on the fracture performance of AHSS
［J］. Forging & Stamping Technology, 2015, 40(12):115-119.

［13］徐梅, 米振莉, 李辉,等. 基于位错密度理论的超高强双相钢DP1000热变形本构模型
［J］. 材料研究学报, 2017,31(8):576-584.

Xu M, Mi Z L, Li H, et al. Constitutive model based on dislocation density theory for hot deformation behavior of ultra-high strength dual phase steel DP1000
［J］. Chinese Journal of Materials Research, 2017,31(8):576-584.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】