Ti6Al4V合金的高溫短時(shí)蠕變本構(gòu)關(guān)系與應(yīng)力松弛行為
發(fā)布人：上海艾荔艾金屬材料有限公司www.jshcn.cn
更新時(shí)間：2015-12-31
對Ti6Al4V合金在不同溫度(650、700和750℃)、初始應(yīng)力(100和150MPa)和預(yù)應(yīng)變(3.97%和15.87%)條件下進(jìn)行多組應(yīng)力松弛試驗(yàn)；研究Ti6Al4V合金高溫下的應(yīng)力松弛行為以及影響因素。利用應(yīng)力松弛的試驗(yàn)數(shù)據(jù)推導(dǎo)出高溫短時(shí)蠕變應(yīng)變速率與應(yīng)力的關(guān)系，對蠕變應(yīng)變速率-應(yīng)力曲線進(jìn)行擬合，得到Ti6Al4V合金的高溫短時(shí)蠕變本構(gòu)方程。將高溫短時(shí)蠕變本構(gòu)關(guān)系代入有限元軟件ABAQUS中對Ti6Al4V合金的應(yīng)力松弛行為進(jìn)行模擬。
Ti6Al4V合金的高溫短時(shí)蠕變本構(gòu)關(guān)系與應(yīng)力松弛行為Short-term creep constitutive relation and stress relaxation behavior of Ti6Al4V alloy at high temperature對Ti6Al4V合金在不同溫度(650、700和750℃)、初始應(yīng)力(100和150MPa)和預(yù)應(yīng)變(3.97%和15.87%)條件下進(jìn)行多組應(yīng)力松弛試驗(yàn)；研究Ti6Al4V合金高溫下的應(yīng)力松弛行為以及影響因素。利用應(yīng)力松弛的試驗(yàn)數(shù)據(jù)推導(dǎo)出高溫短時(shí)蠕變應(yīng)變速率與應(yīng)力的關(guān)系，對蠕變應(yīng)變速率-應(yīng)力曲線進(jìn)行擬合，得到Ti6Al4V合金的高溫短時(shí)蠕變本構(gòu)方程。將高溫短時(shí)蠕變本構(gòu)關(guān)系代入有限元軟件ABAQUS中對Ti6Al4V合金的應(yīng)力松弛行為進(jìn)行模擬。結(jié)果表明：Ti6Al4V合金的應(yīng)力松弛可以分為兩個階段：第一個階段應(yīng)力松弛速率很快，剩余應(yīng)力急劇降低，該過程時(shí)間為應(yīng)力松弛的前250s；第二個階段應(yīng)力松弛較為緩慢，經(jīng)過2000s后剩余應(yīng)力趨向于某一極限值，即應(yīng)力松弛極限。溫度對Ti6Al4V合金應(yīng)力松弛的影響顯著，應(yīng)力松弛隨溫度的升高而加快，且溫度越高，應(yīng)力松弛極限越小。初始應(yīng)力和預(yù)應(yīng)變越大，應(yīng)力松弛極限越大，但是兩者對應(yīng)力松弛行為的影響不大。模擬結(jié)果與試驗(yàn)測得的應(yīng)力松弛曲線具有很高的吻合度，驗(yàn)證了高溫短時(shí)蠕變本構(gòu)關(guān)系的可靠性。
The stress relaxation tests of Ti6Al4V alloy were conducted at different temperatures (650, 700 and 750℃), initial stresses (100 and 150MPa), pre-strains (3.97% and 15.87%). The stress relaxation behavior of Ti6Al4V alloy and influence of different factors at high temperature were discussed. Based on the experimental data of stress relaxation, the relationship between short-term creep strain rate and stress was deduced. Then, the short-term creep constitutive equation of Ti6Al4V alloy at high temperature was obtained by fitting the creep strain rate-stress curves. The short-term creep constitutive relation at high temperature was used to simulate the stress relaxation behavior of Ti6Al4V alloy by integrating the relation into finite element software ABAQUS. The results show that the stress relaxation of Ti6Al4V alloy can be divided into two stages: At the first stage, the stress relaxation rate is very fast and the residual stress reduces sharply, which lasts 250s, While at the second stage, the stress relaxation rate is relatively slow and the residual stress tends to the limit after 2000 s. Temperature has significant influence on the stress relaxation of Ti6Al4V alloy. The rise of temperature can accelerate the stress relaxation rate, and the higher the temperature is, the smaller the stress relaxation limit is. Stress relaxation limit increases with the increase of initial stress and pre-strain which have small effect on the stress relaxation behavior. The simulated results and the experimental stress relaxation curves are with a high degree of similarity, which validates the dependability of the short-term creep constitutive relation at high temperature.
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(tuán)隊(duì)。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(dāng)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，微信和領(lǐng)英與我們互動。
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?and?LinkedIn.