長期熱暴露對含鎢鈮γ-TiAl合金疲勞及表面損傷容限的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-07-05
選取熱暴露(700 ℃，10000 h)前、后的Ti-44.5Al-5Nb-1W-1B(摩爾分數(shù)，%)(5-1-1合金)，對其表面引入不同深度的缺口(0~800 μm)，研究熱暴露對該材料的疲勞性能及缺口損傷容限的影響，以Kitagawa-Takahashi線圖的形式對熱暴露引起的疲勞強化、長裂紋擴展門檻值以及合金在熱暴露影響下對表面損傷的容忍限度進行定量分析。
長期熱暴露對含鎢鈮γ-TiAl合金疲勞及表面損傷容限的影響Effects of long-term thermal exposure on fatigue behavior and surface defect tolerance of W+Nb containing γ-TiAl alloy?選取熱暴露(700 ℃，10000 h)前、后的Ti-44.5Al-5Nb-1W-1B(摩爾分數(shù)，%)(5-1-1合金)，對其表面引入不同深度的缺口(0~800 μm)，研究熱暴露對該材料的疲勞性能及缺口損傷容限的影響，以Kitagawa-Takahashi線圖的形式對熱暴露引起的疲勞強化、長裂紋擴展門檻值以及合金在熱暴露影響下對表面損傷的容忍限度進行定量分析。結(jié)果表明:熱暴露導(dǎo)致的回火穩(wěn)態(tài)良性效應(yīng)大于合金顯微組織出現(xiàn)脆化的有害效應(yīng)，使得熱暴露后無缺口樣品出現(xiàn)疲勞強度提高，而α2層片分解和組織細化能適當提高疲勞長裂紋擴展門檻值。當在熱暴露后引入缺口而無回火效應(yīng)時，長期熱暴露導(dǎo)致的組織脆化成為控制性因素，材料的缺口敏感性增加，表現(xiàn)為出現(xiàn)短缺口效應(yīng)的尺寸范圍在熱暴露后明顯增大。
Single edge through thickness notch of different depths (0-800 μm) was introduced to the surface of Ti-44Al-5Nb-1W-1B alloy (5-1-1 alloy) before and after the thermal exposure at 700 ℃ for 10000 h. The effects of thermal exposure on the fatigue behaviour and the surface defect tolerance capability were studied. The exposure-induced fatigue strengthening, the fatigue threshold of long cracks and the surface defect tolerance under thermal exposure were quantitatively analysed and discussed in the form of Kitagawa-Takahashi diagram. The results show that the positive effect of the thermal exposure-induced tempering stability is greater than the harmful effect of the microstructural embrittlement. The fatigue strength of the non-notched is therefore improved after thermal exposure. On the other hand, the increase in threshold stress for long fatigue crack growth after the long-term exposure is attributed to the refinement of α2?lamellae. The introduction of the short notches after thermal exposure (hereby no tempering effect) has caused increased notch sensitivity, causing an increased notch size range within which the fatigue strength decreases significantly, due to microstructural embrittlement induced by the long-term thermal exposure.
作為值得信賴的合作伙伴和高品質(zhì)金屬合金的半成品供應(yīng)商，艾荔艾擁有完善的服務(wù)體系和專業(yè)的團隊。在同客戶交易的過程中，我們力求根據(jù)不同的應(yīng)用需求將我們的產(chǎn)品做到精益求精。針對當前和未來的市場需求，艾荔艾致力于為客戶提供最佳的金屬材料解決方案。
AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
獲取更多我們供應(yīng)的合金和服務(wù)信息，請致電086-021-67660801或發(fā)電子郵件kefu@ailiaigroup.com聯(lián)系我們，您也可以通過微博，微信，領(lǐng)英，XING，臉書和推特與我們互動。
For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at kefu@ailiaigroup.com. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin,?LinkedIn,?XING,?Facebook?and?Twitter.