摘要
采用显微组织观察、拉伸试验、冲击试验、冲击断口形貌分析等方法,研究了不同冷处理温度对Q345低合金结构钢组织及力学性能的影响。结果表明:在0~-45℃,随着冷处理温度的降低,Q345试验钢中析出的碳化物逐渐增多,抗拉强度与屈服强度逐渐升高,伸长率和冲击吸收能量逐渐降低。冷处理温度为-30~-15℃时,试验钢的强度、伸长率、冲击吸收能量变化最为显著。随着冷处理温度的降低,Q345试验钢的冲击断口由韧性断裂转变为脆性断裂,-30℃冷处理试验钢的冲击断口纤维区百分比为49%,Q345钢的韧脆转变温度在-30℃左右。
The effects of different cold treatment temperatures on the microstructure and mechanical properties of Q345 low alloy structural steel were studied by means of microstructure observation,tensile test,impact test and impact fracture morphology analysis.The results show that at 0--45℃,with the decrease of cold treatment temperature,the carbides precipitated in Q345 steel increase gradually,the tensile strength and yield strength increase gradually,the elongation and impact absorption energy decrease gradually.When the temperature of cold treatment is from-15℃to-30℃,the change of strength,elongation and impact absorption energy is the most significant.With the decrease of cold treatment temperature,the impact fracture of Q345 test steel changes from toughness fracture to brittleness fracture.The percentage of fiber zone in impact fracture of-30℃cold treatment test steel is 49%,and the ductile brittle transition temperature of Q345 steel is about-30℃.
作者
王川
毛翠丽
WANG Chuan;MAO Cuili(School of Architecture and Art,Central South University,Changsha 410075,China;School of Architecture and Urban Planning,Nanyang Institute of Technology,Nanyang 473004,China;School of Mechanical and Automotive Engineering,Nanyang Institute of Technology,Nanyang 473004,China)
出处
《热加工工艺》
北大核心
2021年第8期134-136,共3页
Hot Working Technology
基金
国家社会科学基金项目(14BG071)。
关键词
低合金结构钢
冷处理
组织
冲击吸收能量
low-alloy structural steel
cold treatment
microstructure
impact absorption energy
