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Effect of Carburization on Creep Performance of Cr35Ni45Nb Heat Resistant Alloy

[+] Author Affiliations
Luowei Cao, Guoshan Xie, Zhiyuan Han, Fakun Zhuang

China Special Equipment Inspection and Research Institute, Beijing, China

Paper No. PVP2018-84226, pp. V06AT06A045; 6 pages
doi:10.1115/PVP2018-84226
From:
  • ASME 2018 Pressure Vessels and Piping Conference
  • Volume 6A: Materials and Fabrication
  • Prague, Czech Republic, July 15–20, 2018
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5167-8
  • Copyright © 2018 by ASME

abstract

The purpose of this paper is to describe the changes of the structure and the creep performance for Cr35Ni45Nb alloy after varying carburization. Carburizing layers with different thickness were produced in Cr35Ni45Nb alloy directly by vacuum carburizing experiment. The surface microstructure of Cr35Ni45Nb alloy was essentially changed after varying carburization. Creep performance of carburized only and carburization-creep treatment alloys were compared to study the effect of the carburization on creep for Cr35Ni45Nb heat resistant alloy. Mechanical properties of carburizing layer, carburizing transition layer and base alloy were characterized by micro-hardness, respectively. Results of creep rupture testing for the carburized and non-carburized specimens showed that carburization can influence the rupture time, failure strain and creep rate. Carburization also been proved to affect the constant of CMG and CMMG for different stress or carburizing level.

Copyright © 2018 by ASME
Topics: Creep , Heat , Alloys , Carburization

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