2016年4月5日星期二

Historical origin of Damascus steel powder metallurgy!



Is the so-called "mountains multiply and streams double back no doubt, There is a way out". In the late twentieth Century, the powder metallurgy technology, which developed in Sweden, has brought a new turning point for Damascus steel.

From 1992 to 1995, the Swedish Erasteel in powder injection forming steel production process, increase the parting a powder equipment, so that two kinds of steel powder by the sub equipment according to layers of lined up for the next step of high temperature and high pressure welding process, the formation of parallel lines of powder metallurgy Damascus steel. Modern steelmaking technology can make chemical elements to achieve the best ratio, but this technology is not perfect. Traditional method of steelmaking in the steelmaking furnace to molten steel by blowing argon treatment, vacuum degassing, desulphurization, directly into the sort of metal to the ratio of the required a variety of elements, and then enter the by refractory bricks or cement refractory made of ladle, by ladle into the mold cooling to obtain ingot.

In this process, the steel-making furnace in various chemical elements distribution is the most homogeneous ideal state, and after entering the ladle, temperature began to decrease, at this time of molten steel in the same components will happen aggregation, until into the mold to cool completely, aggregation phenomenon is more serious, strict composition is far less than the in furnace even when the. There is a saying that "the furnace is gold, the bag is silver, cooling is the stone", that is, the meaning of.

In theory, the use of powder metallurgy to produce Damascus steel, you can choose the world's two kinds of steel fusion, but the actual operation is also a grasp of. The choice of the original steel generally consider the following factors:

Performance complementation -- the composition match should be satisfied with a particular application; heat treatment parameters - two kinds of steel should have the same or similar heat treatment process parameters;


Thermal effect - two steel due to the same or similar thermal effect, in order to ensure the forging and heat treatment does not affect the performance of the steel; corrosion patterns of two types of steel elements in at least one has enough differences to ensure the clearness of the lines.

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