论文部分内容阅读
在1 500℃下,采用毛细管-熔池法进行钒在高锰钢中的扩散试验,用EPMA分析和测定钒在毛细管轴向的浓度分布,采用一维稳源半无限长棒扩散模型,由Fick扩散第二定律求解钒原子的扩散系数。用光学显微镜和XRD研究材料的显微组织和物相组成,显微组织结构和微区成分分析表明,在材料的奥氏体基体上分布着细小颗粒状和团块状碳化物增强相,并以毛细管靠近扩散源一端为起点,钒元素浓度及碳化物的数量沿毛细管轴向呈梯度下降(减少)分布。用HX-1000TM显微硬度计检测试样的硬度,结果表明材料硬度沿试样轴向也呈下降趋势,梯度分布特性明显。
The diffusion test of vanadium in high manganese steel was carried out at 1 500 ℃ by capillary-bath method. The concentration distribution of vanadium in the axial direction of the capillary tube was analyzed by EPMA. One-dimensional steady-state semi-infinite rod diffusion model was used, The second law of diffusion solves the diffusion coefficient of vanadium atoms. The microstructure and phase composition of the material were studied by optical microscopy and XRD. The microstructure and micro-composition analysis showed that fine granular and agglomerate carbides were distributed on the austenite matrix and Starting from the end of the capillary close to the diffusion source, the vanadium concentration and the amount of carbide decrease (decrease) along the capillary axis gradient. The hardness of the sample was measured with a HX-1000 (TM) microhardness tester. The results showed that the hardness of the material also showed a downward trend along the sample axis, and the gradient distribution characteristic was obvious.