固溶處理之冷卻速率對SP-700鈦合金微結構與機械性質之影響;Effect of cooling rate of solution treatment on microstructure and mechanical properties of SP-700

NCUIR > Engineering College > Institute of Materials Science and Engineering > Electronic Thesis & Dissertation > Item 987654321/53776

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/53776

Title:	固溶處理之冷卻速率對SP-700鈦合金微結構與機械性質之影響;Effect of cooling rate of solution treatment on microstructure and mechanical properties of SP-700
Authors:	陳彥霖;Chen,Yen-lin
Contributors:	材料科學與工程研究所
Keywords:	機械性質;冷卻速率;SP-700;固溶處理;SP-700;Solution treatment;Cooling rate;Mechanical properties
Date:	2012-08-22
Issue Date:	2012-09-11 18:14:21 (UTC+8)
Publisher:	國立中央大學
Abstract:	SP-700鈦合金經固溶處理後，水淬合金微結構由αp(初析α)+ α”(麻田散鐵)+βr(殘留β)組成，於拉伸過程發生「應力誘發麻田散鐵」相變化，使βr轉變為α與α”造成強度上升，此時水淬合金同時具有高強度與高延性，經時效處理後α”與βr會分解析出α+β平衡相，使強度大幅提升但延性下降；空冷與爐冷合金由αp+α(析出相)+β(平衡相)組成，強度較水淬合金高，經時效後微結構形貌較無變化，強度僅小幅提升。綜合上述可知，考量SP-700鈦合金高強度特性，可由固溶水淬合金，經時效後得到；綜合拉伸性質，以固溶處理水淬合金較優良。According　to　this　research,　the　microstructure　of　solution　treatment　by　WQ　alloy　of　SP-700　is　constructed　by　αp(primary　α）+　α”(martensite)　+　βr(retained β). Stress　induced　martensite　transformation　happened　during tensile　process,　which　makes　strength　superior　due　to　βr　transformed　into　α”.　WQ　alloy　has　high　strength　and ductility　in　the　meanwhile.　In　addition,　α”　and　βr　is　going　to　precipitate　α+β　stable　phase　by　aging　treatment.　Aging　makes　WQ　alloy　became　much　stronger　but　poor　ductility.　The　microstructure　of　AC　and　FC alloys　are　both　formed　by　αp+α(precipitation)+β(stable), and　have　better　strength　than　WQ　alloy,　but　there　is　no　phase　transformation　during　aging　treatment.　From　the　above,　solution　treatment　and　aging　of　WQ　alloy　of SP-700,　which　has　the　best　strength.　Good　tensile　properties　prefer　WQ　alloy　without　aging.
Appears in Collections:	[Institute of Materials Science and Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	820	View/Open

社群 sharing

Loading...