Microstructure and Mechanical Properties of Interface for Titanium/Steel Clad Tubesheet Prepared by Explosive Welding
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摘要: 对ø4 600 mmASME SB265 Gr.1/SA266Gr.2钛/钢复合管板进行爆炸焊接试验，并对复合板结合界面的微观组织特征及力学性能进行了分析测试。宏观、微观分析显示，复合板的结合界面为波状结合，界面两侧的金属均发生了不同程度的塑性变形；界面附近存在短距离的元素互相扩散；界面无分层、夹杂等缺陷。力学性能测试表明，结合界面处的维氏硬度最高，随着与界面距离的增大逐渐降低；复合板的拉伸、冲击、弯曲性能符合ASTM B 898标准的要求，能够满足装备使用要求。Abstract: Explosive welding tests of ø4600 mm ASME SB265 Gr.1/SA266 Gr.2 titanium/steel clad tubesheet were carried out,and the microstructure and mechanical properties of the clad tubesheet interface were analyzed and tested.The macro and micro analyses show that the bonding mode for interface of the clad tubesheet is wave-shaped,and the metals on both sides of the interface have undergone plastic deformation to different degrees.Near the interface,there exists short-distance mutual diffusion of elements.The interface has no defects such as layering and inclusion.Mechanical properties tests indicate that the Vickers hardness is the highest at the bonding interface,and it decreases with increasing the distance from the interface.The tensile,impact and bending properties of clad tubesheet meet the requirements of ASTM B 898 standard,which can meet the requirements of equipment using.
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