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Effect of Heat Treatment on Microstructure and Stress Rupture Properties of a Ni–Mo–Cr–Fe Base Corrosion-Resistant Superalloy

  • Tao Liu
  • Mei Yang
  • Jun-Song Wang
  • Jia-Sheng Dong
  • Li Wang
  • Lang-Hong Lou
Article
  • 7 Downloads

Abstract

The influences of heat treatment and test condition on the microstructure and stress rupture properties of a Ni–Mo–Cr–Fe base corrosion-resistant superalloy have been investigated in this paper. Optical microscope and scanning electron microscope were employed for the microstructure observation, and X-ray diffraction, electron probe micro-analyzer, and transmission electron microscope were used for phase determination. It was found that the grain size increased and the volume fractions of initial M6C carbides decreased along with the increase in solution treatment temperature. When tested at 650 °C/320 MPa, the stress rupture lives decreased with the increase in solution treatment temperature, but the stress rupture lives increased slightly at first and then decreased for the samples solution heat treated at 1220 °C when tested at 700 °C/240 MPa. The elongations showed the descendent trends under these two conditions. The stress rupture life and elongation for the aged samples all showed a noticeable improvement at 650 °C/320 MPa, but there was no noticeable improvement at 700 °C/240 MPa. The reasons can be attributed to the grain size, test conditions, and the initial and secondary carbides.

Keywords

Corrosion-resistant superalloy Heat treatment Stress rupture properties Secondary carbides 

Notes

Acknowledgements

This work was supported by National Natural Science Foundation of China under Grant no. 51601078 and the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDA020404040). The authors are grateful for these financial supports.

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Copyright information

© The Chinese Society for Metals and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Jiangsu University of TechnologyChangzhouChina
  2. 2.Harbin Engineering UniversityHarbinChina
  3. 3.Institute of Metal ResearchChinese Academy of SciencesShenyangChina

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