本文關(guān)鍵詞： B鎳基合金 微觀組織 時(shí)效 析出 硬度 韌性 拉伸性能　出處：《Transactions of Nonferrous Metals Society of China》2015年04期 　論文類型：期刊論文

【摘要】：采用SEM、TEM和力學(xué)性能測(cè)試研究鎳基合金617B在750°C下時(shí)效5000h過(guò)程中的微觀組織穩(wěn)定性和力學(xué)性能。在時(shí)效過(guò)程中,合金617B析出M23C6碳化物和γ′相,前者分布于晶界和晶內(nèi),后者分布于晶內(nèi)。隨著時(shí)效時(shí)間的延長(zhǎng),析出物顆粒尺寸逐漸增大。碳化物和γ′相顆粒起到析出強(qiáng)化作用,并提高時(shí)效態(tài)合金的硬度和強(qiáng)度。在時(shí)效過(guò)程中,時(shí)效態(tài)合金的強(qiáng)度和硬度具有良好的穩(wěn)定性。合金617B時(shí)效后的韌性降低是由于γ′相抑制晶界附近的彈性變形,導(dǎo)致晶界裂紋形成;此外,晶界碳化物析出導(dǎo)致其與基體相的界面強(qiáng)度降低,晶界處易產(chǎn)生裂紋。這使得時(shí)效態(tài)合金的沖擊韌性降低。但在時(shí)效過(guò)程中,時(shí)效態(tài)合金的韌性具有較好的穩(wěn)定性是由于時(shí)效5000 h過(guò)程中析出相的分布未發(fā)生明顯變化。
[Abstract]:The microstructure and mechanical properties of Ni-based alloy 617B during aging at 750 擄C for 5000h were studied by means of SEM TEM and mechanical properties. Alloy 617B precipitates M23C6 carbide and 緯 'phase, the former distributes in grain boundary and crystal, and the latter distributes in crystal. The particle size of precipitates increases gradually. The carbide and 緯 'phase particles play a role in strengthening precipitation and increasing the hardness and strength of aging alloys. The strength and hardness of the aged alloy have good stability. The decrease of toughness of alloy 617B after aging is due to 緯 'phase restraining elastic deformation near grain boundary and resulting in grain boundary crack formation. In addition, the precipitation of grain boundary carbides leads to the decrease of the interfacial strength between the alloy and the matrix phase, and the formation of cracks at the grain boundary, which reduces the impact toughness of the aging alloy, but during the aging process. The ductile stability of the aging alloy is due to the fact that the distribution of precipitated phase does not change obviously during 5000h aging.
【作者單位】： 西安熱工研究院有限公司;
【基金】：Project(2012AA050501)supported by the National High-tech Research and Development Program of China Project(NY20110102)supported by the National Energy Applied Technology and Engineering Demonstration Program,China Project(2012CB724401)supported by the National Basic Research Program of China Project(003)supported by CSEE Youth Science & Technology Innovation,China
【分類號(hào)】：TG146.15
【正文快照】： 1 IntroductionThe efficient ultra supercritical(USC)power plants,operating at steam temperatures of approximately 600°Cand operating pressures of 25-30 MPa,use high-strengthferritic and austenitic steels(e.g.P92,TP347HFG,Super304,TP310HNb N)for boiler a

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本文編號(hào)：1489246