【作者】 张翔；

【导师】 刘世程；

【作者基本信息】 大连交通大学 ， 材料加工工程， 2007， 硕士

【摘要】 本文采用H62黄铜箔做中间层，利用瞬间液相扩散复合法，将20钢、304不锈钢两种金属复合在一起，制备了碳钢／不锈钢复合棒；用光学显微镜、扫描电镜等仪器，EDX能谱分析、X射线分析等分析方法及剪切试验、反复弯曲试验等方法，研究了碳钢／不锈钢复合试棒的界面扩散复合行为；分析了扩散温度、保温时间等工艺因素对结合强度的影响。研究结果表明，在瞬间液相扩散复合过程中，碳钢、液相黄铜、不锈钢界面上的原子间发生互扩散，在促进不锈钢、碳钢间冶金结合的同时，引起界面附近一系列成分、组织、性能变化。扩散复合温度高、时间长时，在20钢母材一侧逐渐形成一层过渡层；在碳钢／黄铜中间层的界面上会出现铬的碳化物；在黄铜中间层中会出现富铁岛状组织。在20钢母材侧的过渡层中，由于不锈钢一侧的合金元素及中间层中的Cu、Zn等元素的扩散提高了该层的淬透性，从而在该过渡层中出现了马氏体组织。黄铜中间层中富铁岛状组织及碳钢侧过渡层中马氏体的出现，导致界面附近硬度升高。界面结合性能试验表明，复合试样在980℃保温0.5h时，界面结合性能较好，进一步提高温度和延长保温时间都会降低界面的结合性能。对撕裂界面的X射线分析结果表明，复合界面开裂主要是在黄铜中间层内，说明复合试棒的结合强度要高于黄铜中间层的拉剪强度。更多还原

【Abstract】 The transient liquid phase (TLP) diffusion bonding was employed to clad the stainless steel (SUS304) to the plain carbon steel (20) in this thesis. The H62 brass foil was used as a interlayer in the clad processing. The interface diffusion behaviors of the plain carbon steel/stainless steel (CS/SS) have been investigated by means of optical microscope (OM), scanning electron microscope (SEM), energy dispersive X-ray detector (EDX), X-ray diffractometer (XRD), shear strength test and alternating bending test. The influences of processing parameters, such as diffusion temperatures and times have been analyzed.The atomic mutual diffusion across the interlayer and the interfaces of CS/H62/SS was observed after TLP diffusion bonding. As the time and/or temperature increased, a diffusion transition layer was found in the side of 20 steel near the interface. Chromium carbide was found in the 20 steel/H62 brass interface. The high-hardness islands rich in Fe formed in H62 brass interlayer. In the transition layer, martensite was observed in air cooled condition, for the alloy elements concentration and the hardenability improvement through diffusion from stainless steel and brass interlayer. The hardness near the interfaces increased because of the formation of Fe-rich islands in the interlayer and martensites in the side of 20 steel.It is revealed by the shear strength test and the alternating bending test that the specimen diffused at 980℃for 0.5h can reach a good performance. As the time lasted and the temperature increased, bonding performance decreased. The bond strength is higher then that of H62 for the sake of crack propagating through the brass interlayer indicated by XRD analysis on the fracture surface peeled from the CS/H62/SS.更多还原