Effects of P on Microstructure and Mechanical Properties of Cast S44660 Super Ferritic Stainless Steel
In order to study the role of P in super ferritic stainless steel,based on the composition of S44660 steel,the mass fraction of P was adjusted,and the P content was controlled as 0.004wt％,0.009wt％,0.033wt％and 0.055wt％.The effect of P content change on the microstructure and mechanical properties of cast S44660 super ferritic stainless steel was studied.The results show that P can expand the crystallization temperature range(ΔT),reduce the grain size and increase the equiaxed crystal rate when the P content is 0.009wt％and 0.033wt％.But when the P content is 0.055wt％,the grain size increases and the equiaxed crystal rate decreases.The appropriate amount of P can improve the room temperature tensile properties and hardness of the material.P has a dual effect on the impact toughness of the material.On the one hand,P has a refinement effect on the grain,thereby improving the impact absorption work of the material;on the other hand,excess P will promote its deflection at grain boundaries,which in turn affects the toughness of the material.
S44660 super ferritic stainless steelfoundrysolidificationmechanical properties
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