Temper Carbon Precipitation

The formation of graphite flakes or nodules from metastable carbides during the annealing of white cast iron. This improves the toughness and machinability of the cast material.

Temper carbon forms when white cast iron is annealed and the carbides decompose, with the carbon precipitating as graphite. This makes the material softer and easier to machine. When welding, you have to watch out: if the heat input is too high or the material cools too quickly, the temper carbon can dissolve again and you'll get hard, brittle spots. Keep the preheat and interpass temperature in check so the base material doesn't get excessively carburized or decarburized.

MetallurgieSchweißtechnik