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题名: Microstructural evolution and mechanical property of a Ni-Fe-based weld metal during long-term exposure at 650 degrees C and 700 degrees C
作者: Wu, D;  Li, DZ;  Lu, SP
发表日期: 2018-2-14
摘要: A newly developed Ni-Fe-based weld metal has been researched for the microstructural and mechanical evolutions during prolonged thermal exposure using scanning electron microscopy and transmission electron microscopy. The M23C6-carbides precipitated at grain boundaries and around the primary (Nb, Ti)C phases in the Ni-Fe-based weld metal during prolonged exposure at 650 degrees C and 700 degrees C. The Cr, Mo-rich sigma(sigma) and Cr-rich alpha-Cr formed as platelets and mainly located in the interdendritic areas during the exposure. sigma phase had the orientation relationships of [001](gamma)//[11 (2) over bar](sigma), ((2) over bar 20)(gamma)//((1) over bar 10)(sigma) and ((2) over bar(2) over bar0)(gamma)//(111)(sigma), with the gamma matrix. Higher (Al + Ti) content accelerated the precipitation of these Cr-rich phases and resulted in a significant deterioration of tensile ductility after 5000 h at 700 degrees C. Precipitating and coarsening of spherical gamma' dominated the tensile strength evolution and the optimized gamma' radius with the best tensile strength was estimated to be 21-25 nm. (Al + Ti) content had no obvious effect on the gamma' coarsening rate but it affected the gamma' particle density N, in two sides: On the one hand, higher (Al + Ti) content increased the N-s, which increased the 0.2% yield strength (R-p0.2)and tensile strength (R-m). On the other hand, higher (Al + Ti) content increased the amount of sigma phases which induced the gamma' envelopes to form and resulted in the decrease of N-s, and it would decreased the R-p0.2 and R-m.
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Recommended Citation:
Wu, D,Li, DZ,Lu, SP. Microstructural Evolution And Mechanical Property Of A Ni-fe-based Weld Metal During Long-term Exposure At 650 Degrees C And 700 Degrees C[J]. Materials Science And Engineering A-structural Materials Properties Microstructure And Processing,2018,716:240-251.

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