Nb、C、Si對(duì)15-15Ti與16-15NbSi奧氏體不銹鋼焊接接頭組織性能影響
[Abstract]:Shell and end plug welding is an important part of the manufacture of sodium cold fast reactor core assembly in China. 15Cr-15Ni contains Ti single phase Austenite stainless steel (15-15Ti), which has good high temperature strength, corrosion resistance and irradiation performance, and is the main candidate coating material for sodium cooled fast reactor fuel in China. The material is prone to welding hot crack and intergranular corrosion, and the matching end plug material has not yet been made in China. In order to solve the problems in welding of 15-15Ti Austenite stainless steel, based on the existing literature and data, an improved 16Cr-15Ni stainless steel (16-15NbSi) containing Nb,Si was designed as end plug material. Six groups of 16Cr-15Ni and 15-15Ti with different alloy composition were self-fluxing welded by argon arc welding (TIG), and Nb,C, was studied. The effect of Si content on the microstructure and properties of welded joints before and after aging is of great significance to determine the alloy composition range of end plugs and to realize the localization of end plug materials. The research work and results of this paper are as follows: (1) the thermodynamic equilibrium phase diagram of six groups of 16-15NbSi alloys is calculated by Thermo-Calc software. The results show that with the increase of Nb element, NbC precipitates from gamma phase to precipitates directly from liquid phase. The increase of C content can promote the formation of NbC. Si element can expand the precipitation temperature range of Laves phase and decrease the precipitation temperature and precipitation amount of 蟽 phase. (2) the microstructure and properties of welded joints before and after aging show that the precipitation amount and size of NbC increase with the increase of Nb element and C element content. The precipitation of precipitated phase at grain boundary is more obvious with the increase of Si element content. After aging, the precipitation amount and size of NbC precipitated phase were almost unchanged when the content of Nb,C in welded joint was low. When the content of Nb and C reached 0.9wt.% and 0.09wt.%, respectively, the precipitated phase size in weld microstructure grew up seriously. There is little change in the tensile properties of the welded joints before and after aging, in which the welded joints have higher tensile strength and extensibility when 0.6wt.% NB, 0.03wt.% C and 0.09wt.%C. The hardness of the welded joint after aging is slightly lower than that before aging, and only 0.6 wt.% NB in the six groups of welded joints, and the hardness of the weld before and after aging is higher than that of the base metal. (3) No cracks were found in the hot crack sensitivity test of the 6 groups of welded joints. In the intergranular corrosion test, intergranular corrosion cracking occurred only in 0.6wt.%Nb and 0.09wt.%C, and no intergranular corrosion tendency was found in the other five groups. (4) the optimum alloy composition range of end plug was 0.02 wt.%, 0.5 wt.% and 0. 7 wt.%, respectively, and the silicon content was less than 0. 4 wt.%, 0. 02 wt.%, 0. 7 wt.%, and 0. 4 wt.%, 0. 4 wt.%, 0. 02 wt.%, 0. 5 wt.%, 0. 7 wt.% and less than 0.4 wt.%, respectively.
【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)】:TG407
【參考文獻(xiàn)】
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