Degradation of a corrosion and heat resistant steel pipe

被引:6
|
作者
Mertinger, Valeria [1 ]
Benke, Marton [1 ]
Kiss, Gabor [2 ]
Reti, Ferenc [2 ]
机构
[1] Univ Miskolc, Inst Mat Sci, Miskolc, Hungary
[2] Budapest Univ Technol & Econ, Dept Atom Phys, Budapest, Hungary
关键词
Cracking furnace; Degradation; Cr-carbide; Cr-oxide;
D O I
10.1016/j.engfailanal.2012.11.002
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Degradation process of a cracking furnace pipe made of the austenitic 25Cr-35Ni alloy was investigated using SEM equipped with energy dispersive probe and full area and selective area X-ray diffraction techniques. The results revealed that the bulk diffusion of C into the tube resulted in a complex process of carbide formation at the grain boundaries, Cr depletion of the matrix and thus the appearance of the ferromagnetic behaviour. The degradation was remarkably enhanced by the abrasive environment and the periodic decoking (elimination of deposed carbon by means of an air-steam mixture) process leading to the formation of spongy Cr-oxide. (c) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码:38 / 44
页数:7
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