發(fā)布時間：2018-07-04 07:31

  本文選題：雙相不銹鋼 + 熱老化�。� 參考：《南京理工大學》2017年碩士論文

【摘要】：核電站的安全營運是核電發(fā)展過程的基礎,研究核電站一回路主管道用雙相不銹鋼的熱老化過程對核電站建設具有重要指導意義。本文研究了來自法國、國內Y廠商和國內G廠商生產的三種不同雙相不銹鋼材料,結合掃描電子顯微鏡(SEM)、納米硬度儀、沖擊試驗機和三維原子探針(APT)技術,系統(tǒng)的分析雙相不銹剛長時間熱老化過程中,宏觀機械性能、微觀組織以及原子空間分布的演變規(guī)律;分析不同廠商生產的雙相不銹鋼的宏觀和微觀差異。對同一溫度不同熱老化時間的研究表明,隨著熱老化的時間延長,鐵素體相的硬度顯著增加,斷裂沖擊功急劇下降,材料由韌性斷裂轉變?yōu)榇嘈詳嗔�。鐵素體中發(fā)生了相分解,形成了 α'相和α相,并且有等軸的G相形核長大。α/γ相界面上有明顯的元素偏析,還析出了 G相。在相界面附近出現(xiàn)了無G相析出區(qū)域,這個區(qū)域的特征與鐵素體其他位置的特征不相同。對不同廠商生產的雙相不銹鋼進行相同的熱老化研究表明,國內目前已經能夠獨立生產符合國際標準的一回路主管道雙相不銹鋼。Y廠商生產的鋼種性能甚至比法國產的更好。不同廠商生產的鋼種微觀組織有非常大的區(qū)別,這一研究對于廠商改進生產技術有積極作用。
[Abstract]:The safe operation of the nuclear power plant is the foundation of the nuclear power development process. The research on the thermal aging process of the dual phase stainless steel in the primary pipeline of the nuclear power plant is of great significance to the construction of the nuclear power plant. This paper studies three different duplex stainless steel materials produced from the French, domestic Y manufacturers and domestic G manufacturers, combined with the scanning electron microscope (SEM). The microhardness tester, impact tester and three dimensional atomic probe (APT) technology are used to systematically analyze the macroscopic mechanical properties, microstructures and the evolution of the atomic spatial distribution during the long time thermal aging process of the dual phase stainless steel, and analyze the macroscopic and microscopic differences between the two phase stainless steel produced by different manufacturers. The study shows that the hardness of the ferrite phase increases significantly with the time of thermal aging, the impact work of the fracture is sharply decreased and the material is transformed from ductile fracture to brittle fracture. The phase decomposition of the ferrite has occurred, the phase of alpha and alpha is formed, and the G phase nucleus of the equal axis grows. There are obvious elements segregation on the interface of the alpha / gamma phase and the precipitation of G. Phase. There is no G phase precipitation area near the phase interface. The characteristics of this region are different from the other positions of the ferrite. The same thermal aging study on the duplex stainless steel produced by different manufacturers shows that the domestic production of double phase stainless steel.Y manufacturer in charge of the first circuit in line with the international standard has been produced at present. Steel properties are even better than those made in France. The microstructure of steel produced by different manufacturers is very different. This study has a positive effect on the improvement of production technology by manufacturers.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TG142.71

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