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《Journal of University of Science and Technology Beijing》 2006-03
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Precipitates in X70 pipeline steel

WANG Chunrning~(1,2)) WU Xingfang~(1)) LIU Jie~(2)) XU Ning'an~(1)) 1)Materials Science and Engineering School,University of Science and Technology Beijing,Beijing 100083,China 2)Anshan Iron & Steel Group Corporation,Anshan 114021,China  
The precipitates in X70 acicular ferrite pipeline steel were investigated by transmission elec- tron microscope.There are two typical precipitates in X70 pipeline steel.One is cubic shaped compound precipitates Ti(Nb)NC with the size of 50nm~1μm,in which TiN plays the main role and the ratio of Ti/ Nb reaches 5~12.The other is spherical shaped Nb(Ti)C with the size less than 20 nm,in which NbC is the main phase with the ratio of Nb/Ti within 1~6.37.The spherical shaped precipitates exist in multi- grains proved by electron diffraction.The cubic shaped precipitates formed above 1 150℃,and varied scarcely during the process afterwards.The spherical (ellipsoidal)shaped precipitates emerged almost total- ly in the range of 900℃ to 1100 ℃,and kept coherent or semi-coherent relationship with the matrix.The precipitate of V was not obviously observed reminding the weak effect of V in steel.The results from the high-temperature ductility and strength curves show that the precipitation started at 1050℃ and the amount of the precipitates reach the highest within the temperature range of 900℃~50℃in the condition of no deformation.
【CateGory Index】: TG111
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