博碩士論文 101329007 完整後設資料紀錄

DC 欄位 語言
DC.contributor材料科學與工程研究所zh_TW
DC.creator陳俊豪zh_TW
DC.creatorChun-hao Chenen_US
dc.date.accessioned2014-7-30T07:39:07Z
dc.date.available2014-7-30T07:39:07Z
dc.date.issued2014
dc.identifier.urihttp://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=101329007
dc.contributor.department材料科學與工程研究所zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstract藉由微結構觀察、機械性質測試,探討不同固溶溫度對水淬SP-700鈦合金微結構及機械性質之影響;結果顯示SP-700鈦合金於高溫單相區(950℃與900℃)進行固溶熱處理後水淬,微結構為較軟的殘留β(βr)基地相與散佈其中的硬脆針狀α”麻田散鐵相所組成,其抗拉強度與延性均不佳。在較高溫雙相區(850℃與800℃)進行固溶處理後水淬,由於室溫仍介於其合金組成之Ms與Mf溫度之間,此時微結構為較軟的βr基地相、硬脆的初析α相(αp)和α”麻田散鐵相組成,由於拉伸試驗時發生『應力誘發麻田散鐵相變化』,合金具有明顯加工硬化特性。而在較低溫雙相區(750℃)進行固溶處理後水淬,此時合金組成之Ms溫度已低於室溫,其微結構為殘留β基地相與初析α相所組成,水淬與拉伸過程皆無麻田散鐵相產生,不具明顯加工硬化特性,但具有最優異之衝擊韌性,與最高的硬度。 綜合而論,SP-700鈦合金於雙相區進行固溶處理後水淬,始能符合鈦合金裝甲材料規範(MIL-DTL-46077)之板材機械性質最低要求,同時具有高強度增幅與高延性之優異成型特性。其中800℃固溶處理後水淬之合金因含適量硬質αp相,且拉伸過程發生明顯應力誘發麻田散鐵相變化,故呈現最高強度增幅與高延性特性。 zh_TW
dc.description.abstractEffect of different solution temperature on microstructure and mechanical properties of water quenched SP-700 titanium alloy were studied by analysing the microstructure and mechanical properties . The results indicated that SP-700 titanium alloy quenched from single-phase region (950℃ and 900℃), the microstructure consists brittle needle shape α" martensite phase and softer retained β phase (βr) base phase, it shows poor tensile strength and ductility. When quenched from two-phase region (850℃ and 800℃), the room temperature is between Ms and Mf, the microstructure consists primary α phase (αp), α" martensite phase and retained β phase (βr) base phase, during tensile test, alloy shows obviously “stress-induced martensite phase transformation”, will have a significant hardening properties. As the solution temperature at 800℃, contents more hard αp phase, will have a higher yield strength, ultimately lead to high strength and high ductility, while the tensile test. Furthermore, quenched from lower temperature (750℃), the Ms temperature of β phase has been below room temperature, the microstructure are retained β phase (βr) and primary α phase (αp), there are no martensite transformation during water quenching and tensile test process, doesn’t have hardening properties, but with the optimum toughness. In conclusion, SP-700 titanium alloy quenched from two-phase region, the mechanical properties are conform to the titanium armor plate material specification (MIL-DTL-46077), which contains high hardness and elongation, and the solution temperature at 800℃ has best hardness and elongation. en_US
DC.subjectSP-700zh_TW
DC.subject固溶處理zh_TW
DC.subject機械性質zh_TW
DC.title固溶處裡對SP-700鈦合金微結構及機械性質之影響zh_TW
dc.language.isozh-TWzh-TW
DC.titleEffect of solution treatment on microstructures and mechanical properties of SP-700 Ti alloyen_US
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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