4.6 Article

Magnetic Evaluation of Heat-Resistant Martensitic Steel Subjected to Microstructure Degradation

Journal

MATERIALS
Volume 15, Issue 14, Pages -

Publisher

MDPI
DOI: 10.3390/ma15144865

Keywords

microstructure degradation; coercivity; hysteresis loop; heat-resistant steel

Funding

  1. National Natural Science Foundation of China [U52071173]
  2. Science and Technology Innovation Commission of Shenzhen [JCYJ20210324120209026, ZDSYS20200810171201007, KQTD2019092917250571]
  3. Science and Technology Project of General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China [2017QK101]

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This paper investigates the use of the magnetic hysteresis loop technique to nondestructively evaluate microstructural degradation in heat-resistant martensitic (HRM) steels. The results show that both coercivity and hardness decrease with thermal aging duration, and there are good linear relations between coercivity, hardness, and microstructure parameters, suggesting the possibility of using magnetic technologies for the nondestructive evaluation of microstructure degradation.
The present paper investigates the use of the magnetic hysteresis loop technique to nondestructively evaluate microstructural degradation in heat-resistant martensitic (HRM) steels. The degradation impairs the safe operation of thermal power plants and it is thus essential to periodically assess it using nondestructive evaluation (NDE) techniques. In this contribution, HRM steels are thermally aged up to 16,000 h at 675 degrees C to simulate the microstructural degradation, then the changes in the magnetic coercivity, hardness, and microstructure are systematically characterized and the relations between them are determined. Both coercivity and hardness decrease with thermal aging duration, which can be interpreted in terms of the microstructure parameters' evolution based on the pinning of crystal defects on domain walls and dislocations. Coercivity and hardness share the same softening trend with aging time, and good linear relations between coercivity, hardness, and microstructure parameters are found. These results provide a key to understanding the magnetic parameter evolution in HRM steels and suggest the possibility of using magnetic technologies for the NDE of microstructure degradation in thermal power plants.

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