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Fatigue–creep behavior of two ferritic stainless steels in simulated automotive exhaust gas and argon

  • Tianlong LiuEmail author
  • Xiaofei Zhu
  • Lijia Chen
  • Hongyun Bi
  • Yingfei Lin
  • Jun Long
Metals & corrosion
  • 18 Downloads

Abstract

The fatigue–creep behaviors of 15CrNbTi and 15Cr0.5MoNbTi steels in the simulated automotive exhaust gas and in argon at 800 °C were investigated. The fatigue–creep tests were conducted under stress-controlled mode with a stress ratio of 0.1 at 800 °C in the simulated automotive exhaust gas and in argon on an electrohydraulic servo fatigue testing machine. A trapezoidal waveform was adopted, and when the cyclic stress reached the maximum tension stress, a 10-s hold time was introduced. The tests results show that 15Cr0.5MoNbTi steel has higher cyclic deformation resistance and fatigue life than 15CrNbTi steel in two atmospheres. Compared with the simulated automotive exhaust gas, both experimental materials possess higher cyclic deformation resistance and fatigue life in argon. The cracks of two experimental materials in two atmospheres were both transgranularly initiated from the free surfaces of the steels and propagated in a transgranular manner. The main substructures of two experimental materials after fractured in two atmospheres were sub-grain structures which formed during fatigue–creep tests. The synergistic effects of solid solution strengthening of Mo and precipitation strengthening of fine Fe2Nb phases increased the cyclic deformation resistance and the fatigue life of 15Cr0.5MoNbTi steel at 800 °C in two atmospheres. In addition, Mo element improved the oxidation resistance of 15Cr0.5MoNbTi steel in the simulated automotive exhaust gas, which has a beneficial effect on the prolongation of fatigue life.

Notes

Acknowledgements

This work was financially supported by the GDAS’ Project of Science and Technology Development (Grant Numbers 2019GDASYL-0103079, 2018GDASCX-0117), the National Natural Science Foundation of China (Grant Numbers 51134010, U1660205) and the Science and Technology Planning Project of Guangdong Province (Grant Numbers 2017A070701029, 2018dr005).

Author’s contribution

TL is the corresponding author who is responsible for the manuscript composition. XZ is mainly responsible for the operation of scanning electron microscope. LC is primarily responsible for the revision of the manuscript. HB provides the steel sheets for the experiment. YL is responsible for operating the TEM. JL is responsible for carrying out measurements and the design and preparation of the experimental apparatus.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Guangdong Key Laboratory of Metal Toughening Technology and Application, Guangzhou Key Laboratory of Advanced Structural Metal MaterialsGuangdong Institute of Materials and ProcessingGuangzhouChina
  2. 2.School of Materials Science and EngineeringShenyang University of TechnologyShenyangChina
  3. 3.Baosteel Central Research InstituteShanghaiChina
  4. 4.Meizhou Yueke Institute of New Materials and Green ManufacturingMeizhouChina

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