| No.8367 is known as Al-6XN and UNS N08367.It is a super austenitic stainless steel with excellent corrosion prevention and crevice corrosion.No.8367 is a kind of corrosion-resistant alloy with super cost-effectiveness.It has a great change in corrosion resistance than the traditional 316L.At the same time,it has closer corrosion resistance to other corrosion resistance such as C-276 or other Nickel-based alloy,and it is cheaper than the former in terms of price,and is loved by users.In this paper,the three-phase low-frequency（1-10 Hz）closed-loop control power supply multi-function electroslag furnace is used for secondary refining of No.8367 austenitic stainless steel.The optical microscopy and IPP6.0 software are used to mix the remelted ingots under various parameters.The number and size of the objects are classified and counted.The types of inclusions were classified by SEM and EDS.The heat-treated samples were subjected to temperature tensile test,temperature impact test and Vickers hardness test.（1）After electroslag remelting,the amount of inclusions in the raw material was significantly reduced,and the size distribution of the inclusions was mainly below 5μm,and the sample prepared under the deoxidation at 7.5 Hz has the highest cleanliness.The total number of inclusions was reduced by 4.2 times and the total area of inclusions was reduced by 7.1 times.（2）The high melting point elements such as Mo,Ni,and Cr in the substrate are sintered into a gray substance due to high temperature during the remelting process.These high melting point compounds are first precipitated when the molten steel is cooled,and they become heterogeneous nucleation sites of various inclusions during solidification,which promotes the precipitation of inclusions.（3）As the power frequency decreases,the oxygen content inside the sample increases,and the oxygen content in the sample prepared at 2.5 Hz reaches 1.45×10-4.This is because the original Al2O3 in the slag system decomposes,causing oxygen to enter the molten steel in the form of ions.（4）After electroslag remelting,the mechanical properties of No.8367 austenitic stainless steel were excellently changed.The elongation of the sample prepared under7.5Hz undeoxidized condition reached 53.96%,which was five times higher than the elongation of raw materials,the impact energy is the highest,the value is 270.1J,which is close to 338.2J under the power frequency parameter,but the tensile strength is reduced after the remelting.（5）The hardness of No.8367 austenitic stainless steel decreased after electroslag remelting.The Vickers hardness value was as low as 160 HV at 7.5 Hz,which was57.3%lower than that of raw materials.The maximum Vickers hardness value was obtained under deoxygenation conditions at a frequency of 10 Hz. |
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