Abstract��Microstructure evolution and precipitation behavior of high niobium pipeline steel produced by thermomechanical controlled processing were investigated by scanning electric microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). Experimental results show that fine grains were obtained in high niobium pipeline steel strip. The grains consisted of acicular ferrite with high dislocation density, martensite-austenite (M/A) constituent and a few of polygonal ferrite. And the precipitates in trail steel were observed, and undissolved TiN during reheating, NbC of strain-induced precipitation and NbC dispersedly precipitated within ferrite matrix at lower temperature. The combination of high strength and toughness is attributed to the fine effective grain size and the interaction between high density dislocation and dispersedly precipitation phase.
�´�����֣�ڣ�������. ������߸ֵ�����֯�����������[J]. �й������ڿ���, 2013, 31(1): 17-20.
ZHANG Chuan-guo,ZHENG Lei,LIU Jun-liang. Microstructure and Precipitation of High Niobium Pipeline Steel. Chinese Journal of Iron and Steel, 2013, 31(1): 17-20.
2013, Vol. 31 
