Abstract��The failure behavior of chute feeder suspension arm 35CrMo in blast furnace was researched through the surface observation, microstructure analysis, composition testing, XRD phase identification, micro-hardness test and analysis of fumes. The results show that there are serious alligator cracks in the surface of suspension arm, and the weight percentage of Fe3C in surface reaches 87.06 %, where C percentage composition is 6.24%. The micro-hardness is HV0.2600, while HV0.2200 in the matrix of 35CrMo suspension arm, and the high temperature and carburizing atmosphere are found in the blast furnace fumes. The process of failure includes several steps as follows. Firstly, the transfer of C in blaster atmosphere into the metal.phase and oversaturation on the metal secondly, formation of cementite M3C on the surface which acts as a barrier for further carbon ingress thirdly, M3C becomes instable and decomposes according to M3C ��C+3M fourthly, the surface becomes embrittlement and generates holes on the surface.finally, the crack on the surface formed in effect of thermal-shock and burdening stress, and the process of carburization will go on corroding on the both side of crack, which causes the failure of chute feeder suspension arm at last.
���ͣ���ȫ���쿣�����ƽ�����»�. ��¯���ϻ��۽���̼����ʴʧЧ����[J]. �й������ڿ���, 2011, 29(6): 35-40.
WANG Meng,WANG Quan-li,YANG Jian-wei,LIU Wei-ping,JU Xin-hua. Failure Analysis of Chute Feeder Carburization Corrosion in Blast Furnace. Chinese Journal of Iron and Steel, 2011, 29(6): 35-40.
2011, Vol. 29 
