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<p><b>Abstract</b>—The effect of thermal aging on the heat resistance of 08Kh18N10T steel under long-term metal deformation before and after aging in the temperature range of 450–750°C under constant limited loads for each of the aging variants is studied. At the same time, accelerated (about 100 h) to long-term (10 000 h and more) creep modes are implemented. Long-term thermal aging at 450°C has little effect on the heat resistance characteristics. Aging in the range of 550–650°C causes dips in long-term ductility and viscosity, reaching the values of hot brittleness in the metal with additional heat treatment according to the mode of stabilizing annealing. High-temperature embrittlement at 550–650°C is a consequence of poor coherent coupling of particles of the intermediate intermetallic σ phase, originating at the interfaces of the interface with the depleted phase chromium around the boundary zone of the austenitic matrix. In this case, the long-term strength in the absence of creep deformation remains high.</p>

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Effect of Long-Term Exposures at Elevated Temperature on Heat Resistance of 08Kh18N10T Steel

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Zh. E. Chulikova,
  • V. V. Ovchinnikov

摘要

Abstract—The effect of thermal aging on the heat resistance of 08Kh18N10T steel under long-term metal deformation before and after aging in the temperature range of 450–750°C under constant limited loads for each of the aging variants is studied. At the same time, accelerated (about 100 h) to long-term (10 000 h and more) creep modes are implemented. Long-term thermal aging at 450°C has little effect on the heat resistance characteristics. Aging in the range of 550–650°C causes dips in long-term ductility and viscosity, reaching the values of hot brittleness in the metal with additional heat treatment according to the mode of stabilizing annealing. High-temperature embrittlement at 550–650°C is a consequence of poor coherent coupling of particles of the intermediate intermetallic σ phase, originating at the interfaces of the interface with the depleted phase chromium around the boundary zone of the austenitic matrix. In this case, the long-term strength in the absence of creep deformation remains high.