The effect of graphite in gray cast iron on its properties is briefly described

Briefly describe the influence of graphite in gray cast iron on its properties (Qufu Longxiang Smelting Casting Accessories Co., LTD.)

The role of graphite has a duality, there is a side that reduces the mechanical properties, but it can give cast iron a number of excellent properties. ① Influence on strength properties: since graphite has almost no strength and because the end of the sheet seems to exist in the cast iron cracks, on the one hand, because it occupies a certain volume in the cast iron, the effective cross-sectional area of the metal substrate to bear the load is reduced; On the other hand, it causes stress concentration when bearing the load; The influence on the hardness: the hardness of the same strength has a range, then because the strength properties are greatly affected by graphite and the hardness basically only reflects the matrix; (3) Impact on notch sensitivity: due to the existence of a large number of graphite sheets in gray cast iron, there is a large number of cracks in the interior, thus reducing the sensitivity to the influence of external notch on mechanical properties; (4) Impact on shock absorption: gray cast iron because of the existence of a large number of sheet graphite, it cuts the matrix and thus prevents the spread of vibration, and can convert it into heat energy divergence, so it has good shock absorption; ⑤ Influence on anti-friction: where the graphite is worn off, a large number of microscopic pockets are formed, which can store lubricating oil to ensure the continuity of the oil film during use.