通過高周疲勞性能測試和組織形貌觀察, 研究了 K416B 鎳基高溫合金 700 ℃的高周疲勞行為. 結(jié)果表明, 在 700 ℃和應(yīng)力比 R=－1 條件下,合金疲勞壽命隨著應(yīng)力的升高而減小, 高周疲勞強度為 175 MPa;?在低應(yīng)力條件下, 形變位錯在 γ 基體中發(fā)生不同取向滑移, 隨著應(yīng)力增加, 位錯剪切 γ?相, 形成層錯; 在拉壓高周疲勞期間, 合金中開動多個滑移系, 并沿不同方向發(fā)生扭曲變形, 在 γ+γ?共晶及碳化物附近產(chǎn)生應(yīng)力集中, 致使裂紋源萌生于合金表面附近的共晶及塊狀碳化物處. 隨著高周疲勞進(jìn)行, 裂紋在擴(kuò)展區(qū)沿枝晶間擴(kuò)展, 并在瞬斷區(qū)發(fā)生典型的解理斷裂.?
Ni-based speralloys have been widely used to make the blade parts of the advanced aeroengines for?
their high temperature tolerance and good mechanical property. During high temperature service, the materials?endure the effects of temperature and alternating load, causing high-cycle fatigue deformation on the hot-end?components. Meanwhile, the fatigue behaviors of the alloy are closely related to the deformation mechanisms and?its microstructure characteristics, such as the size, distribution and morphology of γ? phase and carbides, and the?fatigue fracture of the using materials possesses unpredictability. Therefore, investigating fatigue behaviors of the?material is of significance in alloy design and life prediction. But the high-cycle fatigue behavior of K416B?superalloy with high W content is still unclear up to now. For this reason, by means of high-cycle fatigue property?measurement and microstructure observation, the high-cycle fatigue behavior of K416B Ni-based superalloy at?700 ℃ has been investigated. The results show that at 700 ℃ and stress ratio R=－1, the high-cycle fatigue life of?K416B superalloy decreases with the stress increasing, and high-cycle fatigue strength of the alloy is 175 MPa. At?the condition of low stress amplitude, the deformed dislocations may slip along different orientations in the matrix.?With the stress amplitude increasing, the dislocations may shear into γ? phase and form the stacking fault. During?tension and compression high-cycle fatigue, multiple slip systems are activated in the alloy, and the distortion?occurs along various directions, resulting in stress concentration on the regions of γ+γ? eutectic and carbides. The?crack sources may be initiated at the eutectic and blocky carbide near the surface of the alloy. As high-cycle?fatigue goes on, the cracks propagate along the inter-dendrite in expansion region, and the typical cleavage?fracture occurs in the final rupture region.?
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。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.
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For more information on the alloys and services that we supply,?call us?at 086-021-67660801 or email us at [email protected]. You can also get in touch on social media, we are constantly active on?Weibo,?Weixin?and?LinkedIn.