铸造316L不锈钢偏析及其均匀化处理研究

发布时间：2018-06-08 21:54

  本文选题：均匀化退火 + 枝晶偏析　； 参考：《材料热处理学报》2017年04期

【摘要】：为了消除铸造316L不锈钢铸态组织的枝晶偏析,采用箱式电阻炉对该材料进行了均匀化退火处理的研究。并利用能谱仪、直读光谱仪测试和扫描电镜、光学显微镜观察等方法,研究了该材料铸态组织及枝晶间和枝晶内化学成分的特点,发现了不同的均匀化退火工艺对该材料显微组织的影响规律。并以空位扩散机制为基础,进行了均匀化动力学分析,建立316L合金的均匀化扩散方程。结果表明,铸造316L不锈钢铸态组织存在严重枝晶偏析,枝晶间的Cr、Mo、Ni、Mn等合金元素含量比枝晶内的高。在均匀化过程中,随着退火温度的上升、时间的增长,组织中高熔点共晶相逐渐溶解,均匀化效果增强。当均匀化退火工艺为1150℃×20 h的固溶处理时,铸造枝晶偏析90%消除,可以得到均匀的奥氏体组织。这与均匀化动力学分析结果基本一致。
[Abstract]:In order to eliminate the dendritic segregation of cast 316L stainless steel, homogenization annealing of the material was carried out in a box resistance furnace. The characteristics of as-cast structure and chemical composition in dendrite and dendrite were studied by means of energy spectrometer, direct reading spectrometer, scanning electron microscope and optical microscope. The effect of different homogenization annealing processes on the microstructure of the material was found. Based on the vacancy diffusion mechanism, the homogenization kinetics of 316L alloy was analyzed, and the homogenization diffusion equation of 316L alloy was established. The results show that there is a serious dendritic segregation in cast 316L stainless steel, and the content of Cr _ (Mo) Mo _ (Ni) mn and other alloying elements in the cast 316L stainless steel is higher than that in the dendrite. In the process of homogenization, with the increase of annealing temperature and time, the eutectic phase of high melting point gradually dissolves and the homogenization effect increases. When the homogenization annealing process is 1150 鈩，

本文编号：1997318