本文選題：DZ417高溫合金 + V元素�。� 參考：《沈陽工業(yè)大學(xué)》2017年碩士論文

【摘要】：通過真空定向凝固技術(shù)制備出具有V含量分別為0.69%、0.96%和1.04%的DZ417G柱狀晶高溫合金,并對(duì)其進(jìn)行組織觀察、相組成分析、蠕變性能測(cè)試、拉伸性能測(cè)試及長(zhǎng)時(shí)效處理,深入探討了V對(duì)DZ417G合金組織及性能的影響。掃描電子顯微鏡觀察不同V含量鑄態(tài)和熱處理態(tài)合金γ'相及碳化物形貌表明:隨合金中V含量增加,合金中碳化物形貌逐漸由棒狀轉(zhuǎn)變?yōu)閴K狀,對(duì)棒狀和塊狀碳化物進(jìn)行能譜分析表明,棒狀碳化物中Cr、Al、Co等非MC型碳化物形成元素較多,而塊狀碳化物中Ti、Mo、V等MC型碳化物形成元素較多。隨V含量增多,合金中γ'相形貌幾乎不變,但能譜分析表明:γ'相中V含量亦隨合金中V含量增加而增加。采用電解法萃取合金中的γ'相,并對(duì)不同V含量熱處理態(tài)及鑄態(tài)合金中的γ'相進(jìn)行XRD衍射分析,結(jié)果表明:合金中γ基體相主要為Ni,Cr,Co,Mo,Ti,Al元素組成的固溶體,γ'相主要為Ni3[Al,Ti],碳化物主要是MC型的VC和[Ti,Mo]C。測(cè)定出合金中γ相及γ'相的晶格常數(shù),并計(jì)算晶格錯(cuò)配程度,隨合金中V含量增加,合金中γ相及γ'相的晶格常數(shù)均減小,γ/γ'兩相晶格錯(cuò)配度降低。熱處理后對(duì)不同V含量合金進(jìn)行中溫及高溫蠕變性能測(cè)試表明,隨V含量增加,合金蠕變壽命均大幅增加,蠕變激活能及應(yīng)力指數(shù)增加;觀察裂紋的萌生及擴(kuò)展表明,中溫及高溫蠕變期間,碳化物都是裂紋的主要發(fā)源地。對(duì)合金的微觀組織觀察表明,低V合金中位錯(cuò)跡線較長(zhǎng),位錯(cuò)主要以攀移繞過機(jī)制通過γ'相,而高V合金中位錯(cuò)跡線長(zhǎng)度大幅度縮短,位錯(cuò)切入γ'相形成不全位錯(cuò)+層錯(cuò)組態(tài)。對(duì)熱處理后不同V含量合金進(jìn)行室溫、中溫及高溫拉伸性能測(cè)試表明,室溫條件下高V合金拉伸性能較好,中溫條件下低V拉伸性能較好,高溫條件下高V合金拉伸性能較好。斷口觀察表明,室溫拉伸低V合金斷口處分布大量細(xì)小碳化物,而高V合金斷口處碳化物尺寸較大,數(shù)量較少;中溫條件下,低V合金中滑移跡線較少,而高V合金中滑移跡線較多;高溫拉伸條件下,低V合金斷口平滑,高V合金韌窩較多,并存在大量滑移跡線。合金長(zhǎng)時(shí)效處理1000h后,觀察合金中的碳化物演化,表明:碳化物已經(jīng)發(fā)生分解,棒狀碳化物已經(jīng)分解斷開,而塊狀碳化物由邊緣開始分解;時(shí)效期間γ'相形貌變化特征表明,隨合金中V含量增多,γ'相長(zhǎng)大速率加快;時(shí)效后含V0.69%合金較時(shí)效前合金的蠕變壽命增加,而含V0.96%及1.04%合金蠕變壽命降低。
[Abstract]:DZ417G columnar superalloys with V content of 0.69% and 1.04% were prepared by vacuum directional solidification technique. The microstructure, phase composition, creep properties, tensile properties and long aging treatment of DZ417G superalloys were investigated. The effect of V on the microstructure and properties of DZ 417G alloy was discussed. The morphology of 緯 'phase and carbides of as-cast and heat-treated alloys with different V contents were observed by scanning electron microscope (SEM). The results showed that the morphology of carbides in the alloys changed from rod-like to block-like with the increase of V content in the alloys. The energy spectrum analysis of rod and block carbides shows that there are more forming elements of non-MC type carbides such as Cr-AlC- Co in rod-like carbides, while there are more MC-type carbides in bulk carbides such as Tianmo-V. The morphology of 緯 'phase in the alloy was almost unchanged with the increase of V content, but the energy spectrum analysis showed that the V content in 緯' phase also increased with the increase of V content in the alloy. The 緯 'phase in the alloy was extracted by electrolysis, and the 緯' phase in the as-cast alloy and the heat treated state with different V content were analyzed by XRD diffraction. The results show that the 緯 -matrix phase is mainly a solid solution composed of NiCrCrCoCoMoTiTiAl, the 緯 'phase is mainly Ni3 [Alanti], and the carbides are mainly MC type VC and [TiTiMo] C. The lattice constants of 緯 phase and 緯 'phase in the alloy were measured and the lattice mismatch degree was calculated. With the increase of V content in the alloy, the lattice constants of 緯 phase and 緯' phase decreased and the mismatch of 緯 / 緯 'phase lattice decreased. After heat treatment, the creep properties of the alloys with different V contents were tested at moderate and high temperatures. The creep life and creep activation energy and stress exponent of the alloys increased with the increase of V content, and the crack initiation and propagation were observed. The carbides are the main source of cracks during the creep at moderate temperature and high temperature. The microstructure of the alloy shows that the dislocation trace line is longer in the low V alloy, the dislocation mainly passes through 緯 'phase by climbing around mechanism, while in the high V alloy, the length of the dislocation trace line is shortened greatly, and the dislocation cuts into 緯' phase to form the incomplete dislocation layer fault configuration. The tensile properties of the alloys with different V content after heat treatment were tested at room temperature, moderate temperature and high temperature. The results showed that the tensile properties of high V alloys were better at room temperature, low V tensile properties at medium temperature and good tensile properties at high temperature. Fracture observation shows that a large number of fine carbides are distributed at the fracture surface of low V alloy at room temperature, while the size of carbide at fracture surface of high V alloy is large and the quantity is small, and the slip trace line is less in low V alloy at moderate temperature. Under high temperature tensile condition, the fracture surface of low V alloy is smooth, the dimples of high V alloy are more, and there are a lot of slip trace lines in high V alloy. After long aging treatment for 1000h, the carbide evolution in the alloy was observed. The results show that the carbide has been decomposed, the rod carbide has been decomposed and the block carbide has been decomposed from the edge, and the morphology of 緯 'phase has changed during aging. With the increase of V content in the alloy, the growth rate of 緯 'phase increases, and the creep life of the alloy containing V0.69% increases, while the creep life of the alloy containing V0.96% and 1.04% decreases after aging.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG132.3

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