- 學位論文
循環滲氫-固溶處理對Ti-153合金機械特性之影響
Effects of Cyclic Hydrogenation and Subsequent Solution Treatment on the Mechanical properties of Ti-153 Alloy
摘要
本研究利用Ti-15V-3Al-3Sn-3Cr (Ti-153) 合金板材，以二種不同預先熱處理，施以循環陰極滲氫-固溶處理，觀察經不同滲氫條件之微結構與機械特性變化情形。試片處理前後之微結構變化是利用金相光學顯微術 (Metallographic Optical Microscopy; MOM) 與X光繞射術 (X-ray diffractometry; XRD) 觀察及分析；再利用Nelson-Riley 法求出β相之晶格常數 (lattice constant)；機械特性變化是利用洛氏硬度 (HR15N) 與維式硬度；而耐磨耗特性利用往復磨耗試驗來分析。結果發現，Ti-153板材經循環滲氫-固溶處理後，產生之氫化層能改善結晶性、表面硬度及耐磨耗特性。
並列摘要
The as-received and pre-heat treated sheets of Ti-15V-3Al-3Sn-3Cr alloy (Ti-153) were processed according to the predetermined cyclic cathodic charging-solution treatment to see the effects of various operating parameters on the change of microstructure and mechanical properties. The microstructural changes for specimens after preheating were investigated by employing metallographic optical microscopy (MOM) and X-Ray diffractometry (XRD). Lattice constants of hydrogenated β phase were obtained by using Nelson-Riley approach. The variations of mechanical property were investigated by utilizing Vickers and Rockwell (HR15N) hardness testers. The wear tests were performed by using a reciprocating wear test machine. The test results showed that the cyclic hydrogenation-solution treating process yielded a hydrogenated layer to improve the crystallinity, surface hardness and wear resistance of the as-received and pre-heat treated Ti-153 sheets.