DP1180钢连铸坯高温热塑性研究

高兴健; 刘鑫; 王文礼

doi:10.3969/j.issn.1674-6457.2025.12.020

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (12) : 189-198. DOI: 10.3969/j.issn.1674-6457.2025.12.020

钢铁成形

DP1180钢连铸坯高温热塑性研究

高兴健¹, 刘鑫¹, 王文礼^2,*

作者信息 +

High Temperature Thermoplasticity of Continuous Casting Billet of DP1180 Steel

GAO Xingjian¹, LIU Xin¹, WANG Wenli^2,*

Author information +

文章历史 +

摘要

目的研究DP1180钢的高温热塑性,以提高DP1180钢连铸坯的质量和成材率。方法利用热模拟试验机Gleeble-3800对DP1180钢进行热膨胀试验,获得钢的相变温度点;并在应变速率为0.01 s^-1和1 s^-1、变形温度为650~1 250 ℃条件下进行高温拉伸试验,获得不同变形条件下的应力-应变曲线。利用扫描电镜、金相显微镜、电子背散射衍射分析仪对试样的断口及纵切面进行观察分析,分析材料的断裂方式及DP1180钢的热塑性变化规律。结果 DP1180钢的奥氏体相变开始和结束温度点为715 ℃和855 ℃。在相同应变速率下,高温流变应力随变形温度的升高而减小;当变形温度不变时,流变应力则会随着应变速率的增加而增大。在变形条件范围内,试验钢的断面收缩率均大于60%。试样的断口形貌由不同尺寸的韧窝组成。试样在高温高变形速率下产生明显的动态再结晶。结论 DP1180钢在应变速率为0.01 s^-1和1 s^-1、变形温度为650~1 250 ℃条件下未出现脆性区间。试样的断裂方式主要为韧性断裂与微孔聚集型断裂。在应变速率1 s^-1、变形温度850~1 250 ℃条件下,材料组织塑性变形剧烈,发生明显动态再结晶,再结晶奥氏体在晶界处形核,使组织软化程度增加,提高了材料的塑性。

Abstract

The work aims to study the high temperature thermoplasticity of DP1180 steel to improve the quality and yield of DP1180 steel continuous casting billets. A thermal expansion test of DP1180 steel was carried out with a thermal simulation test machine Gleeble-3800 to obtain the phase transition temperature point of the steel. High temperature tensile tests were conducted at strain rates of 0.01 and 1 s^-1, with deformation temperature ranging from 650 to 1 250 ℃, to obtain stress-strain curves under different deformation conditions. The fracture and longitudinal section of the sample were observed and analyzed by scanning electron microscope, metallographic microscope and electron backscatter diffraction analysis. The fracture mode of the material and the thermoplastic change rule of DP1180 steel were analyzed. The starting and ending temperature points of austenite phase transformation of DP1180 steel were 715 ℃ and 855 ℃. At the same strain rate, the high temperature flow stress gradually decreased with the increase of deformation temperature. When the deformation temperature was constant, the flow stress gradually increased with the increase of strain rate. In the range of deformation conditions, the reduction of area of the test steel was greater than 60%. The fracture morphology of the sample was composed of dimples of different sizes. The sample produced obvious dynamic recrystallization at high temperature and high deformation rate. There is no brittle zone in DP1180 steel under the condition of strain rate of 0.01 s^-1 and 1 s^-1 and deformation temperature of 650-1 250 ℃. The fracture modes of the sample are mainly ductile fracture and micropore aggregation fracture. At the strain rate of 1 s^-1 and the deformation temperature of 850-1 250 ℃, the plastic deformation of the structure is severe, and obvious dynamic recrystallization occurs. The recrystallized austenite nucleates at the grain boundary, which increases the softening degree of the structure and improves the plasticity of the material.

导出引用

高兴健, 刘鑫, 王文礼. DP1180钢连铸坯高温热塑性研究[J]. 精密成形工程. 2025, 17(12): 189-198 https://doi.org/10.3969/j.issn.1674-6457.2025.12.020

GAO Xingjian, LIU Xin, WANG Wenli. High Temperature Thermoplasticity of Continuous Casting Billet of DP1180 Steel[J]. Journal of Netshape Forming Engineering. 2025, 17(12): 189-198 https://doi.org/10.3969/j.issn.1674-6457.2025.12.020

中图分类号： TG142.2

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