Q345钢热处理组织与性能研究  

Study on Microstructure and Properties of Heat Treatment Q345 Steel

作　　者：梁慧慧[1] 李光 LIANG Huihui;LI Guang(School of Architecture Engineering,Xuzhou Technician college,Xuzhou 221151,China;School of Material Science and Engineering,Jiangsu University,Zhenjiang,212013,China;Department of Materials Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]徐州技师学院建筑工程学院,江苏徐州221151 [2]江苏大学材料科学与工程学院,江苏镇江212013 [3]太原科技大学材料工程系,山西太原030024

出　　处：《铸造技术》2018年第9期2087-2090,共4页Foundry Technology

摘　　要：对Q345钢板进行热处理,研究了淬火温度和回火温度对Q345钢显微组织、室温拉伸和冲击性能的影响。结果表明,热轧态Q345钢板的组织为铁素体和珠光体,晶粒大小不一、形状不规则,同时还含有少量混晶组织;随着回火温度的升高,Q345钢的屈服强度、抗拉强度、断后伸长率和断面收缩率都呈先增加而后降低趋势;当900℃淬火+600℃回火时,Q345钢具有较好的综合力学性能。回火温度为200~680℃时,Q345钢的拉伸断口表现为韧性断裂特征;低温下回火(≤400℃),冲击断口表现为解理和准解理断裂特征,在600℃和680℃较高温度回火后,冲击断口为韧性断裂特征。The effect of quenching and tempering temperature on microstructure, tensile and impact properties of Q345 steel plate was studied. The results show that the microstructure of hot rolling state of Q345 steel is ferrite and pearlite, with irregular grain size and irregular shape, and also contains a small amount of mixed crystal structure; With the increase of the tempering temperature, the yield strength, tensile strength, elongation and section shrinkage rate of Q345 steel is increased first and then decreased; When the quenching temperature is 900℃ and the tempering temperature is 600℃, the Q345 steel has good comprehensive mechanical properties. When the tempering temperature is 200-680℃, the tensile fracture of Q345 steel shows ductile fracture characteristics; Under low temperature tempering （less than or equal to 400 ℃ ）, the impact fracture is cleavage and quasi-cleavage fracture characteristics, and under high tempering temperature （600℃ and 680℃）, the impact fracture shows ductile fracture characteristics.

关 键 词：Q345钢板 淬火温度 回火温度 组织 性能 

分 类 号：TG156[金属学及工艺—热处理] TG113[金属学及工艺—金属学]