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| Formation mechanism and control of Mg-Al-O inclusions in H13 steel |
| HUANG Yu1，XIE You1，CHENG Guo-guang1，CHEN Lie2，ZHANG Yan-dong2，YAN Qing-zhong2 |
（1. State Key Laboratory of Advanced Metallurgy， University of Science and Technology Beijing， Beijing 100083，China
2. Technology Center， Xining Special Steel Co.， Ltd.， Xining 810005， Qinghai， China） |
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Abstract The compositions of the forging materials and oxide inclusions in the H13 steel produced through protective atmosphere electro slag remelting process (PESR) and common electro slag remelting process(ESR)were analyzed. The formation mechanism and control of Mg-Al-O inclusions in H13 steel were studied and the dominant area was calculated through the thermodynamic software Factsage. The results showed that the oxygen content of H13 steel produced by PESR is only 0.001 5%， the oxide inclusions were mainly MgO·Al2O3 and the inclusion proportion of small size at 1-3 μm reached to 62.5%. However， the oxygen content of H13 steel produced by ESR reached to 0.002 4%， the oxide inclusions were mainly 72.5%Al2O3＋27.5%MgO·Al2O3 and the proportion of large size at 5-8 μm is 4% while the proportion ofthe small size at 1-3 μm just accounts for 37.8%. The size of Al2O3 was larger than MgO·Al2O3. The changes of [Mg] and [O] content in liquid steel have great influence on the dominant area of MgO·Al2O3， and the high [Mg] content and low [O] content were beneficial to the formation of MgO·Al2O3， but decrease the size of oxide inclusions in H13 steel. However， the inclusion of MgO·Al2O3 at large size can be the heterogeneous nuclei of (Ti，Nb，V)(C，N)， which will be discussed in the future.
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Received: 17 October 2016
Published: 09 June 2017
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2017, Vol. 52 
