Reasons of Unstable Impact Energy for a Boron��containing Low Carbon Bainitic Steel
WANG Ji��man1,2,DUAN Lin��na1,2,SUN Xin��jun2,LIU Qing��you2,ZHU Xin��kun1
1. Institute of Materials and Metallurgy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan,China;2. Institute for Structural Materials of Central Iron and Steel Research Institute, Beijing 100081, China
Abstract��The impact toughness of an untempered low��carbon bainitic steel was studied, and the relationship between the impact toughness and fracture morphology, inclusions, and microstructure was analyzed. The results show that higher impact energy can be obtained when the fracture surface has larger fraction of shear lips and fiber region with bigger and more homogeneous dimples. It is observed by SEM that there exist large size inclusions, which are mainly composed of oxides and sulfides containing Al and Ca in the crack initiation region for the samples with lower impact energy. At the same time, with the increasing of the number of inclusions, the impact energy decreases significantly.
������;������;���¾�;������;������. �����̼������ֳ��ֵ���ȶ�ԭ�����[J]. �й������ڿ���, 2009, 27(1): 37-0.
WANG Ji��man;DUAN Lin��na;SUN Xin��jun;LIU Qing��you;ZHU Xin��kun. Reasons of Unstable Impact Energy for a Boron��containing Low Carbon Bainitic Steel. Chinese Journal of Iron and Steel, 2009, 27(1): 37-0.
2009, Vol. 27 
