鈦合金與雙相不銹鋼硬銲接合之機械性質與結構特性研究

Mechanical and Structural Properties of Titanium Alloy to Duplex Stainless Steel Brazed Joints

吳東穎(Tung-Ying Wu)

指導教授 ： 黃和悅

國立虎尾科技大學/工程學院/材料科學與綠色能源工程研究所/碩士(2014年)

https://doi.org/10.6827/NFU.2014.00143

摘要

硬銲是一種固態接合方法，該接合技術是在接合界面元素產生原子擴散，進而使得擴散層與母材具有相同的物理和機械性能。當應用於異種金屬接合時，可在的接合表面之間預置低熔點之填料，加熱至其熔點以上造成中間層和母材之間相互擴散並促進金屬接合；此外，接合溫度比母材的熔點低得多，因此對母材任何不利影響都可降至最低。本研究以純鋁為中間層對SUS 2205雙相不銹鋼以及Ti-6Al-4V鈦合金以低壓氣氛保護方式進行異種接合，探討其介面化合物之形成以及元素擴散之情況。接合後之試片以光學顯微鏡與掃描電子顯微鏡觀察顯微組織，以能量色散光譜進行成分分析及X 光繞射做相鑑定，最後進行剪強度與微硬度試驗。實驗結果顯示，最佳接合條件為1170℃持溫時間45分鐘，在接合界面上填料與母材之間的原子相互的擴散結合，但隨著持溫時間的增加，介金屬化合物也隨之成長，使其剪強度下降。

關鍵字

硬銲 ； 鈦合金 ； 雙相不銹鋼 ； 金屬間化合物 ； 顯微組織 ； 機械性質

並列摘要

Brazing is a solid state joining process. This bonding technique is based on the atomic diffusion of elements at the brazing interface, which has same physical and mechanical properties as base metal. The majority of applications of brazing for the joining of dissimilar metals, a low-melting point interlayer alloy placed between the bonding surfaces is heated above its melting point and diffuses in base metals to provide a very sound brazed joint. Besides, the temperature of diffusion bonding is much lower than the melting point of the base metal and therefore any detrimental effects on the base metal are minimized. In this paper the brazing of duplex stainless steel SUS 2205 to titanium alloy Ti-6Al-4V with a pure aluminum interlayer was studied, and specimens were joined in an argon gas atmosphere using a tunnel furnace. Due to the bond region was affected by the diffusion of some elements from the brazing process therefore the intermetallic compounds formed in the inter transition layer were completely investigated. Microstructure of brazing joints was examined by scanning electron microscopy, and energy dispersive spectroscopy. X-ray diffraction was used to identify the phases formed in the bond region. Eventually the shear strength and the Vickers hardness used to evaluate the mechanical property of the single lap joint. The results of this study revealed, the optimal parameters of dissimilar metal joints has been done at 1170℃ and holding for 45 minutes. Interdiffuse of elements was observed between interlayer and base metals. The interfacial intermetallic compounds grew with increasing holding time, and resulting in low shear strength.

並列關鍵字

transient liquid phase bonding ； titanium alloy ； duplex stainless steel ； aluminum ； intermetallic compound ； defects

參考文獻

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