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.