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- W3184733829 abstract "The variant selection and pairing directly affect the grain boundary distribution in the coarse-grained heat-affected zone (CGHAZ) of pipeline steel and consequently impact toughness. In this study, we attempted to establish a direct correlation between heat input, variant, grain boundary distribution, and impact toughness in CGHAZ of pipeline steel by means of electron backscatter diffraction (EBSD) analysis. The results showed that the variant selection is strong at 4 kJ/cm, such that V1/V1 becomes the dominant variant pair in CGHAZ. As the heat input increases, the transformation strain decreases, such that the mean variant pair in CGHAZ is V1/V2 and V1/V4/V8 at heat inputs of 9 and 21 kJ/cm, respectively. Compared with V1/V1 and V1/V4/V8 variant pairs at 4 and 21 kJ/cm, respectively, V1/V2 variant pair promotes the formation of high-angle grain boundaries (HAGB) and decreases the residual stress. When the heat input is 9 kJ/cm, the microstructure of CGHAZ has maximum resistance to crack propagation and lower crack nucleation ability, leading to the highest impact energy." @default.
- W3184733829 created "2021-08-02" @default.
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- W3184733829 date "2021-09-01" @default.
- W3184733829 modified "2023-10-02" @default.
- W3184733829 title "Study on the mechanism of heat input on the grain boundary distribution and impact toughness in CGHAZ of X100 pipeline steel from the aspect of variant" @default.
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- W3184733829 doi "https://doi.org/10.1016/j.matchar.2021.111344" @default.
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