熱處理對Ti-6Al-4V真空硬銲件微觀結構及機械性質之影響

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Title:	熱處理對Ti-6Al-4V真空硬銲件微觀結構及機械性質之影響
Authors:	廖奕誠;Liao, Yi-Cheng
Contributors:	機械工程學系
Keywords:	鈦合金;Ti-6Al-4V;真空硬銲;銲後熱處理;Ti-15Cu-15Ni;Titanium Alloy;Ti-6Al-4V;Vacuum Brazing;Post Weld Heat Treatment;Ti-15Cu-15Ni
Date:	2020-07-30
Issue Date:	2020-09-02 19:09:31 (UTC+8)
Publisher:	國立中央大學
Abstract:	本研究採用Ti-6Al-4V鈦合金為實驗材料，以對接銲接方式進行真空硬銲，其中利用鈦基填料Ti-15Cu-15Ni做為填充金屬。母材Ti-6Al-4V經過真空硬銲後導致機械性質下降，為了改善母材機械性質，常利用固溶時效熱處理，提升母材強度，因此本研究將探討真空硬銲後進行固溶及時效熱處理，探討銲後經不同條件之固溶及時效熱處理對於銲道與母材微觀結構及機械性質的影響。研究結果顯示，母材於銲後因產生費德曼組織導致強度下降。銲後經固溶960℃ x 60 min與時效482℃ x 2 hr可消除母材之費德曼組織，並析出強化相，獲得最佳抗拉強度；銲道則因介金屬化合物微細化，獲得優異之接合強度。銲後採用高溫時效(固溶960℃ x 20 min及時效704℃ x 2 hr)，母材會產生過時效軟化，銲道經過長時間高溫時效後介金屬化合物粗大化，導致銲道接合強度下降，但因晶粒粗大化而改善韌性，並獲得較高衝擊能。 ;In this study, Ti-6Al-4V titanium alloy was the experimental material, Ti-15Cu-15Ni was the filler metal, and butt welding was performed by vacuum brazing. The mechanical properties of the base metal Ti-6Al-4V was reduced after vacuum brazing. In order to improve the mechanical properties of the base material. The post weld heat treatment was adopted to improve the microstructures and mechanical properties of weld bead and base metal. The results showed that the strength of the base metal was reduced due to the Widmanstatten structure after vacuum brazing. The best tensile strength of the weldment was obtained by solution at 960℃ x 60 min and aging at 482℃ x 2 hr. After the above post weld heat treatment process, the Widmanstatten structure of base metal was eliminated and the strengthened phase precipitated. Also, the weld bead was refined by the intermetallic compound, and resulted in excellent bonding strength. If the aging temperature was too high (solution at 960℃ x 20 min and aging at 704℃ x 2 hr), the base metal was over-aged and softened. The coarsened intermetallic compound in the weld bead led to decreasing in the strength and increasing in the impact energy.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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