Preparation of Ultrafine Grain Austenitic High-nitrogen Stainless Steel by Spark Plasma Sintering
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摘要: 将球磨后的304奥氏体不锈钢粉末,用放电等离子烧结技术烧结成型。烧结温度选取900℃,烧结压力分别选取30 MPa和50 MPa。烧结后的试样通过XRD、SEM、TEM等分析其相组成及晶粒度。结果表明:烧结后试样的基体为奥氏体,晶粒度大约为100~200 nm;试样的密度接近于钢的密度,说明烧结达到了较高的致密度;试样硬度远远高于普通不锈钢的硬度。电化学腐蚀结果及金相照片可以看出,试样烧结越致密,其耐腐蚀性能越好。Abstract: The SPS(spark plasma sintering) process was used to sinter 304 austenitic stainless steel powder made by milling.The sintering temperature is 900 ℃,and the sintering stress are 30 MPa and 50 MPa respectively.The phase composition and crystallite size of sintered sample were analyzed by XRD,SEM and TEM.The results show that the sintered sample matrix is austenite,and the crystallite size is 100~200 nm approximately.The density of the sample closes to steel,this show the sintering samples attain to high densification.The rigidity of the samples is higher than that of common austenitic stainless steel.The electrochemistry erosion and metallographic testing show that the more compact the better corrosion resistance of samples is.
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Key words:
- spark plasma sintering /
- densification /
- electrochemistry erosion /
- stainless steel /
- austenite /
- powder
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