DP1180钢的高温变形行为  

High temperature deformation behavior of DP1180 steel

作　　者：高兴健 谭传成 罗健 王文礼[2] GAO Xingjian;TAN Chuancheng;LUO Jian;WANG Wenli(Manufacturing Management Department,Baosteel Zhanjiang Iron and Steel Co.,Ltd.,Zhanjiang 524076,Guangdong,China;School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China)

机构地区：[1]宝钢湛江钢铁有限公司制造管理部,广东湛江524076 [2]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《中国冶金》2024年第11期53-60,共8页China Metallurgy

基　　金：宝钢湛江钢铁科研项目(2023035)。

摘　　要：为优化DP1180钢热变形工艺,在变形温度为850~1100℃、应变速率为0.1~10.0 s^(-1)条件下,利用Gleeble-3800热模拟试验机对DP1180钢连铸坯进行高温压缩,得到其真应力-真应变曲线,分析变形温度和应变速率对其应力的影响;通过已有模型建立和修正了适合于该钢种的变形抗力模型,并根据真应力-真应变曲线绘制其在不同应变量下的热加工图。试验表明,变形温度的升高和应变速率的降低都会使真应力变小,动态再结晶也就更容易发生;利用Origin软件获得的变形抗力模型拟合值与实测值基本一致,经过误差分析,模型精度较高,但其适用范围仍有一定局限性;绘制热加工图后发现,试验条件下其中几乎很少有流变失稳区,得到试验钢种理论热加工最佳区域为应变速率1.0~10.0 s^(-1)、变形温度1050~1100℃。研究结果为DP1180钢热变形工艺优化设计提供了试验依据及理论指导。In order to optimize the hot deformation process of DP1180 steel,the high temperature compression test of DP1180 steel was carried out by Gleeble-3800 thermal simulation testing machine under the conditions of deformation temperature of 850-1100℃and strain rate of 0.1-10.0 s^(-1).The true stress-ture strain curve of the steel was obtained,and the influence of deformation temperature and strain rate was analyzed.The deformation resistance model suitable for the steel was established and modified by the existing model,and the hot processing maps under different strain were drawn according to the true stress-ture strain curve.Experiments show that the increase of temperature and the decrease of strain rate will make the true stress smaller,and dynamic recrystallization are more likely to occur.The deformation resistance model established by Origin,the fitting curve is basically consistent with the measured value,and the accuracy of the error analysis model is high,but its scope of application still has some limitations.By drawing the hot processing map,it is found that there are almost few rheological instability zones in the hot processing map under the experimental conditions.The best theoretical thermal processing area is the strain rate of 1.0-10.0 s^(-1),and the deformation temperature is controlled at 1050-1100℃.The research results provide experimental basis and theoretical guidance for the optimization design of hot deformation process of DP1180 steel.

关 键 词：DP1180钢 热压缩试验 真应力-真应变 变形抗力模型 热加工图 

分 类 号：TG142.1[一般工业技术—材料科学与工程]