Microstructure Refinement and Performance Improvement of Martensitic Stainless Steel by TiC Nano-particles
To solve the problems that the strength and plasticity of martensitic stainless steel are difficult to improve simultaneously,TiC nano-particles are introduced to refine the grains of stainless steel matrix.Martensitic stainless steel reinforced by TiC nano-particles with particles content of 0.25wt%was prepared by non-consumable vacuum electric arc furnace,and compared with as-cast stainless steel.The results show that the average size of retained austenite grains of TiC nano-particle reinforced steel decreases from 234.4 μm to 62.9 μm,and the main distribution range is from 50-350 μm to 20-100 μm.After heat treatment,TiC nano-particles reinforced steel is composed of refined laths and sub-micron cellular retained austenite between laths,the tensile strength of the reinforced steel is increased by 23.31%,the microhardness increases by 7.12%,and the elongation increases by 99%,which improve the strength,hardness and plasticity of matrix steel simultaneously.
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