METHOD OF INCLUDING FEATURES IN AN ARTICLE MANUFACTURED FROM MARAGING STAINLESS STEEL

摘要

A method for including a feature in an article manufactured from a maraging stainless steel comprises the steps of focusing an energy beam on the article at a temperature of at least 1000 °C in a nitrogen-free atmosphere. The beam generates intense energy and melts/vaporizes the maraging stainless steel and thus includes the feature along with austenitic edges. The article is cooled to a temperature of between 0 °C and -80 °C, in order to subject the austenitic edges to the isothermal martensitic transformation. The article is finally hardened at a temperature between 375 °C and 600 °C to cause particles in the edges to precipitate out from solution into martensitic structure. A centrifugal bowl comprises a base that can rotate about an axis of rotation. A filter sieve in the shape of a perforated peripheral side sieve wall extends from an open end to the base, and a plurality of vanes is disposed in a predominantly radial direction on the inner surface of the perforated peripheral side sieve wall.