循環滲氫與後續固溶處理對Ti-15V-3Al-3Sn-3Cr合金氫濃度分佈之影響

Effects of Cyclic Hydrogenation and Subsequent Solution Treatment on the Hydrogen Distribution of Ti-15V-3Al-3Sn-3Cr Alloy

陳漢平(Han-Ping Chen)

指導教授 ： 吳臺一

大同大學/工程學院/材料工程學系所/碩士(2010年)

摘要

本研究針對原材與兩種不同前固溶熱處理(1000℃–30 min.及500℃–30 min.)之Ti-15V-3Al-3Cr-3Sn板材，施以循環陰極滲氫–後續固溶熱處理，觀察在不同處理條件下（以50 mA/cm2 電流密度滲氫1小時與以5 mA/cm2 電流密度滲氫10小時）三種不同Ti-15V-3Al-3Cr-3Sn板材近表面層中微結構變化及機械性質變化之情形。滲氫後微結構變化是利用金相光學顯微術 (Metallographic Optical Microscopy; MOM) 及X光繞射術 (X-ray diffractometry; XRD) 來觀察及分析，機械性質變化是利用維氏微硬度試驗及往復磨耗試驗來分析。結果發現：預設之熱-氫處理製程促使氫進入Ti-15V-3Al-3Cr-3Sn試片近表面層中，造成晶格膨脹及近表層微觀結構變化，硬度與耐磨耗性大幅提升；α-固溶處理之Ti-15V-3Al-3Sn-3Cr合金板材擁有較佳之滲氫能力，且其機械特性表現也相當良好；採用低電流密度長時間滲氫的處理條件，獲致較佳之滲氫效益。

關鍵字

循環滲氫-固溶處理 ； X光繞射術 ； 金相顯微術 ； Ti-15V-3Al-3Cr-3Sn ； 往復磨耗試驗

並列摘要

The as-received and pre-heat treated sheets of Ti-15V-3Al-3Cr-3Sn alloy (1000℃–30 min. and 500℃–30 min.) were processed according to the designed cyclic cathodic charging (at 50mA/cm2 for 1 hr and at 5mA/cm2 for 10 hrs) combining subsequent solution treatment to see the effect of various operating parameters on the microstructural change and hydrogen distribution. The variations of microstructure were investigated by employing metallographic optical microscopy (MOM) and X-Ray diffractometry (XRD) and The variations of mechanical property were investigated by employing Vickers micro-hardness test and Reciprocating wear test. The designed processing led to lattice dilatation and changes in microstructure at the near surface and a significantly enhance the hardness and strength. The α-solution treatment of Ti-15V-3Al-3Cr-3Sn alloy has a better hydrogenation ability and mechanical property. Cathodic charging at lower current density for longer operating period resulted in higher hydrogenation performance.

並列關鍵字

cyclic hydrogenation-solution treatment ； XRD ； MOM ； Ti-15V-3Al-3Cr-3Sn ； Reciprocating wear test

參考文獻

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