��1. School of Materials Science and Metallurgical Engineering�� Wuhan University of Science and Technology�� Wuhan 430081�� China 2. Research and Development Center�� Wuhan Iron and Steel Group Corp.�� Wuhan 430080�� China��
Abstract��The voids quantity and volume percentage of high strength and toughness low carbon bainitic steel with different tensile deformation rates were measured by X-ray CT technique. The results indicated that the voids quantity increased slowly with increasing tensile deformation. However�� the voids increased rapidly near tensile failure of samples. The total number of tensile voids in samples at fracture deformation rate of 21% was almost 17 times more than that of deformation rate at 19%. Meanwhile�� the ratio of void volume percentage was up to 18.2 times. The ductile fracture mechanism of high strength and toughness steel should be as follows�� the cracks were gradually connected with the single void caused by inclusions�� then�� the ductile fracture was caused due to the coalescence with large amount of little voids initiated from A/M island.
Ԭ��ϲ���� ����ͯ��ΰ���� ��. ��ǿ������������ٷ��ʲ������Ͷϻ���[J]. �й������ڿ���, 2016, 34(4): 7-11.
YUAN Ze-xi��LIU Jun��TONG Ming-wei����ZHANG Yang. Void percentage measurement and ductile fracture mechanisms in tensile test of high strength and toughness steel. Chinese Journal of Iron and Steel, 2016, 34(4): 7-11.
2016, Vol. 34 
