Abstract

Electromagnetic welding, also referred to as magnetic pulse welding, is a solid-state welding method utilized for joining two distinct materials through high velocity impact. The direct fusion of stainless steel with titanium poses various difficulties owing to the absence of metallurgical compatibility and the occurrence of brittle intermetallic compounds such as FeTi and CrTi. To tackle these challenges, a sustainable, low heat input method like impact welding was applied to address the metallurgical compatibility of the two metals. In this study, a new technique involving aluminum foil, silver foil, and nitinol powder as intermediary materials was investigated to establish a fresh bimetallic structure between Ti-SS304L. Thorough analysis of microstructures, interface formations, and reactions was conducted using scanning electron microscopy and X-ray diffraction. The outcomes showcased successful prevention of intermetallic phase formation through the incorporation of these intermediary materials. Microhardness measurements indicated the absence of brittle FeTi and CrTi phases at the welding interface. Additionally, the weld interface was observed to be situated amid two intermetallic layers at the Ti-SS304L interface, ensuring resistance against corrosion. This inventive method not only averted the creation of harmful intermetallic compounds but also bolstered the overall strength and corrosion resilience of the joint between titanium and stainless steel. The micro hardness obtained at Ti-SS304L interface is 305 Hv and also improved 20% at interface of interlayer materials.

中文翻译：

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中间层材料对电磁焊接钛-不锈钢界面显微组织、硬度和耐蚀性的影响

摘要

电磁焊接，也称为磁脉冲焊接，是一种固态焊接方法，用于通过高速冲击连接两种不同的材料。由于缺乏冶金相容性以及脆性金属间化合物（如 FeTi 和 CrTi）的出现，不锈钢与钛的直接熔合带来了各种困难。为了应对这些挑战，采用了冲击焊接等可持续的低热输入方法来解决两种金属的冶金兼容性问题。在本研究中，研究了一种以铝箔、银箔和镍钛合金粉末作为中间材料的新技术，以在 Ti-SS304L 之间建立新的双金属结构。使用扫描电子显微镜和 X 射线衍射对微观结构、界面形成和反应进行了全面分析。结果表明，通过加入这些中间材料可以成功防止金属间相的形成。显微硬度测量表明焊接界面不存在脆性 FeTi 和 CrTi 相。此外，观察到焊接界面位于 Ti-SS304L 界面处的两个金属间层之间，确保了耐腐蚀性。这种创造性方法不仅避免了有害金属间化合物的产生，而且增强了钛和不锈钢之间接头的整体强度和耐腐蚀性。 Ti-SS304L界面处的显微硬度为305 Hv，中间层材料界面处的显微硬度也提高了20%。