周恒,马宏昊,沈兆武,杨明,徐俊峰
ZHOU Heng,MA Hong-hao,SHEN Zhao-wu,YANG Ming,XU Jun-feng

• 1:中国科学技术大学中国科学院材料力学行为和设计重点实验室
• 2:中国科学技术大学火灾科学国家重点实验室

摘要(Abstract)：

为了研究TiNi合金/Q235钢爆炸复合板界面微观结构及形成机理，分别以Ti质量分数50.8%的TiNi合金板、Q235钢板为复板和基板，利用爆炸焊接技术制备了TiNi合金/Q235钢层状复合材料。通过SEM和EDS检测手段对结合界面的微观结构了进行分析，并结合光滑粒子流体动力学(SPH)数值模拟方法，揭示其演化过程。同时，利用拉伸和压剪实验，测试了界面的力学性能。结果表明，TiNi合金/Q235钢爆炸复合板界面呈现规则的波状结合，界面拉伸强度达到683 MPa,压剪强度达到291 MPa。数值模拟分析显示，碰撞点离开后，界面熔融物质仍具有较高运动速度，与受主射流裹挟和高压区挤压而侵入界面的熔融金属流相向运动，发生强烈的圆周运动和机械搅拌，最终形成涡旋区。
In order to study the interface microstructure and formation mechanism of the TiNi alloy/Q235 steel explosive composite plate, the layered TiNi alloy/Q235 steel composite material was prepared by explosive welding technology using TiNi alloy plate with a mass fraction of 50.8% Ti as the composite plate and Q235 steel plate as the substrate. The microstructure of the interface was analyzed by the SEM and EDS, and its evolution process of the interface was revealed by the smoothed particle hydrodynamics(SPH) numerical simulation method. At the same time, the mechanical properties of the interface were tested by tensile and compressive shear experiments. The results show that the interface of the TiNi alloy/Q235 steel explosive composite plate presents regular wavy bonding, the interfacial tensile strength reaches 683 MPa and the compressive shear strength reaches 291 MPa. The numerical simulation analysis shows that after the collision point leaves, the molten material of the interface still has a high velocity, and it moves in the opposite direction of the molten metal flow invaded the interface by the main jet flow and the high pressure zone extrusion, resulting in strong circular motion and mechanical stirring, and finally forming a vortex zone.

关键词(KeyWords)： 记忆合金;爆炸焊接;SPH模拟;微观结构特性
shape memory alloy;explosive welding;SPH simulation;microstructure characteristics

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51874267);; 中央高校基本科研业务费资助项目(WK2480000008,WK2480000007)

作者(Author): 周恒,马宏昊,沈兆武,杨明,徐俊峰
ZHOU Heng,MA Hong-hao,SHEN Zhao-wu,YANG Ming,XU Jun-feng

DOI: 10.19931/j.EB.20210034

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