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雙重時(shí)效對(duì)Ti1023合金低周疲勞行為的影響
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“973”國(guó)家基礎(chǔ)研究項(xiàng)目（2007CB613804）；中國(guó)博士后科學(xué)基金項(xiàng)目（20110491652）；國(guó)家自然科學(xué)基金重點(diǎn)項(xiàng)目（50831004）和面上項(xiàng)目（51071118）


Effect of Duplex Aging on Low Cycle Fatigue Behavior in Ti-10V-2Fe-3Al Alloy
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    摘要:

    研究了雙重時(shí)效對(duì)Ti-10V-2Fe-3Al合金低周疲勞行為的影響。結(jié)果顯示，高應(yīng)變幅（△εt/2＝1.5%，1.2%，1.0%）下，合金表現(xiàn)為循環(huán)軟化；低應(yīng)變幅(△εt/2＝0.8%，0.6%)下，則表現(xiàn)為循環(huán)應(yīng)力飽和。疲勞壽命測(cè)試結(jié)果表明，雙重時(shí)效疲勞壽命和直接時(shí)效疲勞壽命相當(dāng)，疲勞總應(yīng)變幅和疲勞壽命滿(mǎn)足Coffin-Manson方程。SEM斷口形貌顯示，雙重時(shí)效后疲勞裂紋穩(wěn)定擴(kuò)展區(qū)有明顯的疲勞條紋，疲勞裂紋以穿晶方式擴(kuò)展，并伴隨著撕裂棱和二次裂紋，但二次裂紋較直接時(shí)效大量減少。TEM形貌顯示，不論是雙重時(shí)效還是直接時(shí)效，疲勞后變形組織都很均勻。雖然雙重時(shí)效和直接時(shí)效具有相當(dāng)?shù)钠趬勖沁@種工藝縮短了時(shí)效時(shí)間，節(jié)約了能源，能更好地滿(mǎn)足實(shí)際工業(yè)生產(chǎn)需求。

    Abstract:

    The effect of duplex aging on low cycle fatigue behavior of Ti-10V-2Fe-3Al alloys was investigated. The cyclic stress response curves show that the cyclic softening occurs at the high strain amplitude of 1.5%, 1.2% and 1.0%. However, when the strain amplitude decreases to 0.8% and 0.6%, cyclic stress saturation appears. Low cycle fatigue life of duplex aging is similar to that of simplex aging. The relationship between cycle total strain amplitude and fatigue life fits to classic Coffin-Manson equation. The fractography analyses suggest that transgranular fracture with well-developed fatigue striations is the predominant failure mode. The plastic deformation traces and secondary cracks are also observed. TEM examination reveals that fatigue deformed microstructures are homogeneous for both duplex aging and simplex aging. Due to shortening operated time and saving energy, duplex aging is more beneficial to actual industrial production than simplex aging.

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陳 威,孫巧艷,肖 林,孫 軍.雙重時(shí)效對(duì)Ti1023合金低周疲勞行為的影響[J].稀有金屬材料與工程,2012,41(11):1911~1916.[Chen Wei, Sun Qiaoyan, Xiao Lin, Sun Jun. Effect of Duplex Aging on Low Cycle Fatigue Behavior in Ti-10V-2Fe-3Al Alloy[J]. Rare Metal Materials and Engineering,2012,41(11):1911~1916.]
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  • 收稿日期:2011-11-27
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