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组织状态及界面形成过程对固态金属剪切连接后的连接强度及性能有重要影响,采用实验研究的方法,结合理论分析实施了不同压下量、空冷和水冷Q345钢剪切连接实验。通过微观组织分析、界面结合过程探究和连接强度测定,分析了组织演变和界面形成机制,得到了剪切连接过程的组织及界面演变规律。结果表明:随压下量增加,界面晶粒细化程度提高,组织得到明显细化,界面孔洞逐渐消失,形成共有晶粒界面;晶粒细化驱动为动态再结晶,界面形成为三阶段过程;压下量为125%空冷后,晶粒尺寸由原态40μm细化到10μm左右,连接界面消失,连接强度为500.56 MPa。
Tissue state and interfacial formation process have an important influence on the strength and performance of the connection after solid state metal shearing. Experiments were carried out to analyze the shear connection of Q345 steel with different reduction, air cooling and water cooling by theoretical analysis. Through the microstructure analysis, the study of the interface bonding process and the determination of the connection strength, the mechanism of tissue evolution and interface formation was analyzed. The microstructure and interface evolution of the connection process were obtained. The results show that with the reduction of pressure, the degree of grain refinement at the interface increases, the microstructure is refined, the interface pores gradually disappear, and a common grain boundary is formed. The grain refinement is driven by dynamic recrystallization and the interface is formed in three stages After 125% reduction, the grain size was refined from 40μm to 10μm, the interface disappeared and the bonding strength was 500.56 MPa.