1. Technology Center�� Maanshan Iron and Steel Company Ltd.�� Maanshan 243000�� China 2. State Key Lab of Rolling and Automation�� Northeastern University�� Shenyang 110819�� China
Abstract��In the production process of water heater container by cold rolled enamel steel�� some circular defects were found in the vicinity of weld seam. The macroscopic characteristics and forming reason of these defects were systematically analyzed using optical microscopy�� scanning electron microscopy and energy dispersive spectroscopy. The microstructure and elemental distribution of defects were investigated under metallographic microscope and scanning electron microscopy. The metallographic microstructure of enamel plate interface and substrate were analyzed in detail. The results showed that the formation of defects were mainly due to uneven surface near the weld. The gas was concentrated on the surface recess under the effect of surface tension of liquid phase�� and larger bubbles were easily formed near the weld. By taking appropriate measures to eliminate irregularity near the welding seam to increase the coherence�� the formation of bubble pit defects were reduced.
�� �ˣ�����ޣ��� �裬�� Ԥ�������Σ�������. �´ɸֺ��촦���Բ㰼��ȱ���γ�ԭ�����[J]. �й������ڿ���, 2016, 34(4): 48-52.
ZHANG Yi��WU Hong-yan��ZHANG Qi��DU Yu��DONG Fu-tao��DU Lin-xiu. Cause analysis of pit defect formation in weld seam enamel layer of enamel steel. Chinese Journal of Iron and Steel, 2016, 34(4): 48-52.
2016, Vol. 34 
