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采用包覆的方法模拟可控气氛热复合技术制备了钛/钢双金属复合板,利用光学显微镜观察了结合界面附近的显微组织,借助扫描电镜对拉剪断口进行了分析。结果表明:氩气压力为0.08～0.12MPa,轧制温度为800～850℃,首道次变形率为40%的条件下,钛/钢复合板的拉剪强度不低于为170MPa,同时具备良好的弯曲性能;复合板界面结合良好,无裂纹、气孔等缺陷,界面形成约2μm厚的脆性层,且分布断续;剪切应力作用下,分层和解理是其主要断裂方式,由此可见,采用可控气氛热复合技术制备钛/钢双金属复合板是可行的,尤其对于薄型复合板,该方法能有效降低界面脆性层的影响,具有明显优势。为进一步提高复合板结合性能,应考虑添加合适的中间层材料或调整轧制工艺加以改善。
Titanium / steel bimetallic composite plates were prepared by means of coating method and controlled atmosphere thermal compounding technique. The microstructure of the interface near the interface was observed by optical microscope. The fracture of the tensile and shear sections was analyzed by scanning electron microscopy. The results show that under argon pressure of 0.08-0.12MPa, rolling temperature of 800-850 ℃ and the first pass deformation rate of 40%, the tensile strength of titanium / steel composite plate is not less than 170MPa, Good bending performance; good bonding interface, no cracks, pores and other defects, the interface is about 2μm thick brittle layer, and the distribution intermittent; shear stress, the delamination and cleavage is the main fracture mode, thus It can be seen that it is feasible to prepare titanium / steel bimetallic composite board by controlled atmosphere thermal compounding technology. Especially for thin composite board, this method can effectively reduce the influence of interface brittle layer and has obvious advantages. In order to further improve the bonding performance of the composite board, it should be considered to add suitable intermediate material or adjust the rolling process to be improved.