摘要
采用Gleeble-3800型热模拟试验机对新型低成本超高强度G31L钢的热变形行为进行了系统研究,变形温度为750~1250℃、应变速率为0.01~10 s^-1,最大应变量为0.9。取不同变形条件下的峰值应力,计算G31L钢热变形激活能Q及其本构方程;并基于动态材料模型绘制应变量为0.2、0.4、0.6和0.8的功率耗散图和流变失稳图,建立该材料热加工图。分析发现合理加工区主要分布在1050~1250℃,0.01~0.32 s^-1范围内,且功率耗散因子η大于0.3,在此区域内合理选择变形温度和应变速率,使基体发生动态再结晶并避免晶粒过分长大,可获得性能优良的锻件。
A systematic study on the hot deformation behavior of G31 L steel,a new type of ultra-high strength steel with low cost,was conducted by using Gleeble-3800 thermal simulator.The deformation temperature was 750-1250℃,the strain rate was 0.01-10 s^-1,and the maximum strain was 0.9.The thermal deformation activation energy Q and the constitutive equation of G31 L steel were calculated with the peak stress under different deformation conditions.The power dissipation diagram and the rheological instability diagram at the strain of 0.2,0.4,0.6 and 0.8 were plotted based on the dynamic material model,and the hot processing map of the material was constructed.The analysis shows that the reasonable processing area is mainly distributed in the range of 1050-1250℃,0.01-0.32 s^-1,and the power dissipation factorηis greater than 0.3.Selecting the deformation temperature and strain rate reasonably in this range can cause dynamic recrystallization of the matrix and avoid the excessive growth of grains,and the forging parts with good performance can be obtained.
作者
杨鹏
宁静
苏杰
姜庆伟
YANG Peng;NING Jing;SU Jie;JIANG Qing-wei(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Institute for Special Steels,Central Iron and Steel Research Institute,Beijing)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第7期150-157,共8页
Journal of Plasticity Engineering
关键词
超高强度钢
热变形
本构方程
热加工图
微观组织
ultra-high strength steel
hot deformation
constitutive equation
hot processing map
microstructure
