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Investigations on carburizing mechanisms of Cr35Ni45Nb subjected to different service conditions in a high-temperature vacuum environment

Published online by Cambridge University Press:  20 March 2015

Yichao Peng ,
Maicang Zhang ,
Jiangchu Xiao ,
Jianxin Dong  and
Chenyang Du
Yichao Peng
Affiliation:
Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Maicang Zhang*
Affiliation:
Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jiangchu Xiao
Affiliation:
Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jianxin Dong
Affiliation:
Department of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Chenyang Du
Affiliation:
Department of Pressure Vessel, China Special Equipment Inspection and Research Institute, Beijing 100013, China
*
a)Address all correspondence to this author. e-mail: mczhang@ustb.edu.cn
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Abstract

The carburizing behaviors and mechanisms for Cr35Ni45Nb alloy subjected to different service conditions were studied in a high-temperature vacuum environment. Generally, the carburizing process of an alloy is always accompanied by diffusional heterogeneous reactions regardless of the service condition of the alloy. For a carburized original tube, there is a layered structure at the inner wall of the tube, which is comprised of a M7C3 zone, a M7C3–M23C6 mixed zone, and a M23C6 zone with different morphologies. However, for a 6-year tube (short for a tube serviced for 6 years), the composite oxide layers formed previously act as effective barriers to carbon infiltration. Moreover, the Cr2O3 scale tended to be carbonized to form carbide scale to spall from the surface in a reducing environment, while the SiO2 kept stable all along. Once the oxide layers were removed or carbonized enough, inconceivable internal carburization occurred widely.

Keywords

phase transformationcarbonizationcorrosion
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 6 , 28 March 2015 , pp. 841 - 851
Copyright
Copyright © Materials Research Society 2015 

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