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| Effect of holding time at 850 ℃ on intergranular oxidation layer of 15CrMo steel |
| SHI Xuexing,JU Xinhua,YAN Chunlian,WEN Juan |
| Technical Research Institute of Shougang Group Co., Ltd., Beijing 100043， China |
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Abstract The effect of holding time at 850 ℃ on intergranular oxidation layer was studied by scanning electron microscope (SEM) and electron probe. The results showed that with the increase of holding time, the oxide scale thickness of the outer layer of 15CrMo steel increased gradually, but the intergranular oxidation depth increased first and then tended to be stable. When the holding time was 30 min, the intergranular oxidation depth was about 13 μm. When the time increased to 120 min, the intergranular oxidation depth was about 17 μm and tended to be stable. The alloying elements including Mn, Cr and Si were enriched obviously in the location of intergranular oxidation. Moreover, the grain boundaries were coarsened and the quantity of oxide points in the grains increased.
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Received: 24 November 2021
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2022, Vol. 40 
