應(yīng)力時效對DZ125鎳基合金組織演化及蠕變抗力的影響

應(yīng)力時效對DZ125鎳基合金組織演化及蠕變抗力的影響Effect of stress aging on microstructure evolution and creep resistance of DZ125 nickel-based superalloy

通過蠕變性能測試，組織結(jié)構(gòu)觀察和晶格常數(shù)測定，研究應(yīng)力時效對 DZ125鎳基合金組織演化與蠕變抗力的影響。結(jié)果表明：合金在980 ℃、90 MPa近服役條件下的蠕變壽命是9714 h；蠕變期間，樣品中間區(qū)域的γ′相優(yōu)先形成完整的筏狀組織，在無應(yīng)力的肩部區(qū)域，γ′相呈現(xiàn)串狀形態(tài)；隨應(yīng)力時效時間延長至9714 h，合金中筏狀γ′相的厚度尺寸從0.4 μm增加至1.8 μm，合金中γ′、γ兩相的晶格常數(shù)值增加，兩相的錯配度增大。其中，應(yīng)力時效致使筏狀γ′相粗化及錯配度增大，可改善蠕變抗力，是合金在近服役條件具有較長蠕變壽命的原因之一。

By means of creep properties measurement, microstructure observation and parameters measurement, the effects of the stress aging on microstructure evolution and creep resistance of DZ125 nickel-based superalloy were investigated. The results show that the creep life of the alloy at 980 ℃ and 90 MPa near service condition is 9714 h. During creep, the various morphologies of γ′ and γ phases display in different regions of sample. Wherein, the γ′ phase in the middle region of sample firstly transforms into rafted structure, while the γ′ phase in the stress-free region exhibits bunch-like structure. As the time of the stress aging prolongs to 9714 h, the size of the rafted γ′ phase in thickness increases from 0.4 μm to 1.8 μm, which increases the parameters and misfits of γ′ and γ phases in the alloy. The deformation mechanisms of alloy during steady state creep are dislocations slipping in the matrix channels and climbing over the rafted γ′ phase. In the later stage of creep, the deformation mechanisms of alloy are dislocations shearing into the rafted γ′ phase. Wherein, the fact that the stress aging results in the coarsening of γ′/γ′ phases to increase the misfits may improve the creep resistance of the alloy, which is thought to be one of the reasons of the alloy with a longer creep lifetime.

全文下載：https://pan.baidu.com/s/1qJJuN3nH1AnwrQbowr6qDw?

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，通項公司擁有完善的服務(wù)體系和專業(yè)的團(tuán)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(dāng)前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。

TXCO 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. TXCO develops the best alloy material solutions for current and future challenges.

獲取更多我們供應(yīng)的產(chǎn)品和服務(wù)信息，請致電086-021-6786 0205或發(fā)電子郵件service@sinoav.com聯(lián)系我們，您也可以通過微信，微博，領(lǐng)英，臉書，推特和谷歌+與我們互動。

For more information on the products and services that we supply, call us at 086-021-6786 0205 or email us at service@sinoav.com. You can also get in touch on social media, we are constantly active on Weixin, Weibo, LinkedIn, Facebook, Twitter and Google+.