摘要
采用Gleeble-3500热/力模拟试验机测定了新开发的纳米析出高强度钢在1 300～600℃的力学性能。结果表明:随拉伸温度降低,试验钢的抗拉强度逐渐升高,在1 000～750℃之间拉伸时,断面收缩率出现低谷,1 000℃时塑性仍很低,此温度区间即为该钢的第三脆性区,750℃时的断面收缩率最低,而在1 100～1 250℃之间钢的塑性良好。金相显微组织观察和扫描电镜观察发现,钢的第三脆性区拉伸试样断面呈现沿晶断口特征,以脆性断裂为主,表明纳米析出高强度钢的高温强度高,钢的塑性低谷的温度范围宽,易在连铸连轧生产过程中产生裂纹等缺陷,给实际生产工艺带来困难,需要注意制造工艺设计。
The mechanical properties of novel developed nano-precipitated high strength steel was tested in the temperature range of 600 - 1 300 ℃ by using Gleeble-3500 system. The third brittle zone of the steel was found to be occurred within the temperature range of 700℃ to 1 050 ℃. The fracture surfaces of hot tensile test specimens in the third brittle zone were observed by using a scanning electron microscope （SEM）. The results showed that the tensile strength of the steel increased gradually with temperature decreasing. The steel showed excellent reduction in area （RA） in the temperature range of 1 100 - 1 250 ℃. However, RA appeared a wide plastic trough in the temperature range of 700 ℃ to 1 050 ℃, with a minimum RA value occurred at 750 ℃. The fracture surface of the specimens in the third brittle zone showed the intergranular fracture characteristics. So, it should be paid more attention to avoid crack defects during production process designing for this steel.
出处
《上海金属》
CAS
北大核心
2013年第4期5-8,共4页
Shanghai Metals
基金
973项目(编号:2010CB-630802)
国家自然科学基金项目(编号:50934011和50971137)
关键词
纳米析出
高强度钢
高温力学性能
热塑性脆性区间
Nano-Precipitated, High Strength Steel, High Temperature MechanicalProperty, Hot Ductility, Brittle Zone
