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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure, Hardness, and Corrosion Behavior of TiC-Duplex Stainless Steel Composites Fabricated by Spark Plasma Sintering
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Microstructure, Hardness, and Corrosion Behavior of TiC-Duplex Stainless Steel Composites Fabricated by Spark Plasma Sintering

机译：由火花等离子体烧结制造的TIC-DOPLEX不锈钢复合材料的微观结构，硬度和腐蚀行为

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摘要

Duplex stainless steel composites with various weight fractions of TiC particles are prepared by spark plasma sintering. Ferritic 434L and austenitic 316L stainless steel powders are premixed in a 50:50 weight ratio and added with 3-9 wt.% TiC. The compacts are sintered in the solid state under vacuum conditions at 1223 K for 5 min. The effects of TiC content on the microstructure, hardness, and corrosion resistance of duplex stainless steel composites fabricated by powder metallurgy are evaluated. The results indicate that the TiC particulates as reinforcements can be distributed homogeneously in the steel matrix. Densification of sintered composites decreases with increasing TiC content. M23C6 carbide precipitates along grain boundary, and its neighboring Cr-Mo-depleted region is formed in the sintered microstructure, which can be eliminated subsequently with appropriate heat treatment. With the addition of TiC, the hardness of duplex stainless steel fabricated by powder metallurgy can be markedly enhanced despite increased porosity in the composites. However, TiC particles increase the corrosion rate and degrade the passivation capability, particularly for the composite with TiC content higher than 6 wt.%. Weakened metallurgical bonding in the composite with high TiC content provides the preferred sites for pitting nucleation and/or dissolution.
机译：采用放电等离子烧结法制备了不同TiC颗粒质量分数的双相不锈钢复合材料。铁素体434L和奥氏体316L不锈钢粉末以50:50的重量比预混合，并添加3-9 wt.%的铁素体。在1223K的真空条件下，在固态下烧结5分钟。评估了TiC含量对粉末冶金制备的双相不锈钢复合材料的微观结构、硬度和耐腐蚀性的影响。结果表明，TiC颗粒作为增强体可以均匀地分布在钢基体中。随着TiC含量的增加，烧结复合材料的致密化程度降低。M23C6碳化物沿晶界析出，在烧结组织中形成相邻的Cr-Mo贫化区，通过适当的热处理可以消除该贫化区。加入TiC后，尽管复合材料中的孔隙率增加，但粉末冶金双相不锈钢的硬度仍能显著提高。然而，TiC颗粒增加了腐蚀速率并降低了钝化能力，尤其是对于TiC含量高于6 wt.%的复合材料。TiC含量高的复合材料中，减弱的冶金结合为点蚀形核和/或溶解提供了首选位置。

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