Research on Vacuum Diffusion Bonding of Multi-layer 316L Stainless Steel Plates
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摘要: 实现了150层316L不锈钢板的真空扩散连接，通过拉伸测试和金相观察，得到了接头力学性能和界面组织特征。结果表明，高温退火后母材的屈服强度和拉伸强度明显下降，断后伸长率显著提高。相较于高温退火后母材的力学性能，垂直试样的屈服强度高，但拉伸强度和断后伸长率低；平行试样屈服强度高，拉伸强度与母材相当，断后伸长率低。室温和高温垂直/水平拉伸试样均呈现出典型塑性断裂特征。接头顶部、中部和底部等各区域扩散连接质量良好，界面组织特征相似。Abstract: One hundred and fifty layers of 316 L stainless steel plates were successfully joined via the vacuum diffusion bonding. The mechanical properties and interfacial microstructure of joints were studied by tensile tests and metallographic observation. The results indicated that the yield strength and tensile strength of the base material(BM) processed by the same diffusion bonding parameters decreased significantly and the elongation increased obviously. Compared with those of the processed BM, the yield strength of the joint perpendicular to the boding interface increased, and the tensile strength and elongation decreased. The yield strength of the joint parallel to the boding interface was higher than that of the BM, the tensile strength equivalent to that of the BM, and the elongation lower than that of the BM. All the tensile samples including room-temperature and elevated samples exhibited typical ductile fracture. Each zone including the top, middle and bottom of the joint showed good bonding appearance, and the interfacial microstructures at different zones were similar.
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