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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65323

    Title: 固溶處裡對SP-700鈦合金微結構及機械性質之影響;Effect of solution treatment on microstructures and mechanical properties of SP-700 Ti alloy
    Authors: 陳俊豪;Chen,Chun-hao
    Contributors: 材料科學與工程研究所
    Keywords: SP-700;固溶處理;機械性質
    Date: 2014-07-30
    Issue Date: 2014-10-15 15:06:14 (UTC+8)
    Publisher: 國立中央大學
    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。
    ;Effect 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.
    Appears in Collections:[材料科學與工程研究所 ] 博碩士論文

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