期刊
ENGINEERING FAILURE ANALYSIS
卷 16, 期 7, 页码 2171-2178出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2009.02.009
关键词
Pyrolysis furnace tubes; Heat-resistant steel; Carburization; Intergranular failure
资金
- King Fahd University of Petroleum and Minerals
Pyrolysis furnace tubes made of HP45 heat-resistant steel casting to handle carbonaceous gases at about 850 degrees C in a petrochemical plant developed longitudinal cracks after less than one-third of the expected life. Detailed microstructural analysis showed that the cracks were developed by a ductile intergranular mode. This was correlated with high-temperature carburization attack leading to massive precipitation of intergranular carbides and a mixture of carbides and sigma phase within the matrix. Experimental results suggested that the highly reducing nature of the environment precluded the tube material from developing and maintaining a surface protective oxide scale, which facilitated the rapid inward diffusion of carbon. (C) 2009 Elsevier Ltd. All rights reserved.
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