Su Ruiping,Ding Yi,Gong Zhihua.Simulation and Application Practice of Vacuum Arc Remelting Process for CrNiMoAlTi-Based Precipitation-Hardening Stainless Steel[J].Special Steel,2026,47(04):1-9.
Su Ruiping,Ding Yi,Gong Zhihua.Simulation and Application Practice of Vacuum Arc Remelting Process for CrNiMoAlTi-Based Precipitation-Hardening Stainless Steel[J].Special Steel,2026,47(04):1-9.DOI: 10.20057/j.1003-8620.N260013.
Simulation and Application Practice of Vacuum Arc Remelting Process for CrNiMoAlTi-Based Precipitation-Hardening Stainless Steel
Numerical simulation was carried out on the vacuum arc remelting (VAR) process of CrNiMoAlTi series precipitation-hardening stainless steel using the Meltflow-VAR software. The effects of different melting rates, helium pressures, and feeding processes on the molten pool morphology and the formation tendency of ingot black spot defects during the VAR process were calculated, and statistical analysis of inclusions was also performed. The results show that with the increase of melting rate, the molten pool morphology transforms from a shallow and flat "U" shape to a deeper "V" shape, and the mushy zone also expands with the rising melting rate. When the melting rate is 5.0 kg/min, the formation tendency of black spots in the core region is minimized, which is conducive to the floating of inclusions. The heat transfer efficiency of the helium layer increases with the increase of helium pressure. At a helium pressure of 300 Pa, the depth-diameter ratio of the molten pool reaches the minimum value, which is beneficial to heat transfer, reduces the risk of element segregation, and significantly improves the formation tendency of ingot black spots. The optimal setting of melting rate reduction rate in the feeding stage is 0.03 kg/min, which can increase the cooling rate of the feeding end and improve the formation tendency of ingot black spots. After the VAR process, the total number of TiN inclusions in the center of the ingot is less than that in the edge region of the ingot, and the total number of inclusions in the head of the ingot is more than that in the tail of the ingot. No inclusions larger than 25 μm are found in any part of the ingot, and the rating of various inclusions is ≤ 0.5.
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