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钢中非金属夹杂物的化学组成、数量、大小及其分布形态反映钢被污染的程度,叫做纯洁度。它对钢的塑性、韧性、疲劳和工艺性能有很明显的影响,是一项很重要的材质指标。 检查钢纯洁度的方法很多,目前广为采用的是比较法和金相定量法,比较法是指将显微镜(高倍)下观察到的夹杂物与标准评级图片进行比较以确定级别的方法。它的受检面积小,一般还用宏观(塔形试样)检查与之配合;金相定量法是指用显微镜在大面积上测定夹杂物
Non-metallic inclusions in steel chemical composition, quantity, size and distribution of steel reflect the degree of contamination, called purity. It has a significant effect on the ductility, toughness, fatigue and process properties of steel and is a very important material index. There are many ways to check the purity of steel. At present, the comparative method and the metallographic method are widely used. The comparative method refers to the method of comparing the observed inclusions under microscope (high magnification) with the standard rating pictures to determine the grade. Its subject area is small, the general also macro (tower-shaped sample) check with the match; Metallographic quantitative method refers to the use of a microscope in the determination of inclusions on a large area