Causes analysis of surface cracks on medium plate of 316LN steel
LI Meng-qi1�� WEI Ying-hui1,2�� HOU Li-feng1�� LI Yong-gang1
1. School of Material Science and Engineering�� Taiyuan University of Technology�� Taiyuan 030024�� China 2. L��liang College�� L��liang 033000�� China
Abstract��The formation causes of surface cracks on medium plate of 316LN steel were studied by macroscopic examination�� microscopic examination and chemical composition analysis. The results showed that the formation of cracks was possibly due to surface bulge of cast slab before rolling. The instrusion situation of surface bulge on rolled plate surface after rolling was simulated by finite element software ANSYS/LS-DYNA. The results showed that surface cracks were formed due to the incomplete surface descaling of bulge zone on cast slab before rolling. The composite oxides of Fe and Cr were not removed completely. The bulge zone was rolled and turned into the substrate in the rolling process because of the high friction between the roller and slab. The oxides on the surface of the slab was peeled off and embedded into the matrix. Due to the high hardness and brittleness�� the embedded oxides were hardly combined with the matrix. As a result�� the seaming was not realized in the further rolling process�� causing surface cracks.
�������� ��Ӣ�ۣ� �����棬 ������. 316LN���к��������Ƴ������[J]. �й������ڿ���, 2015, 33(4): 36-40.
LI Meng-qi�� WEI Ying-hui���� HOU Li-feng�� LI Yong-gang. Causes analysis of surface cracks on medium plate of 316LN steel. Chinese Journal of Iron and Steel, 2015, 33(4): 36-40.
2015, Vol. 33 
