Abstract:
A method for producing a metallic component comprises the steps of first preparing a component by means of an additive manufacturing process, and second exposing said manufactured component to a heat treatment. Improved properties of the resulting component are achieved by said heat treatment comprising a zone annealing step.
Abstract:
The invention relates to a method for manufacturing a component, especially for gas turbines and other thermo machinery. The method includes providing a data set defining the component for being used in an additive manufacturing process; manufacturing said component by means of said additive manufacturing process according to said data set; and subjecting said manufactured component to a heat treatment (HT) in order to change the microstructure of the manufactured component. The properties of the component are improved in that at least two different component volumes (CA1-CA3) are defined within said component prior to the manufacturing step; at least two different process parameters (A, B) are chosen for the additive manufacturing process, which process parameters (A, B) result in different driving forces for a recrystallization and therefore a different recrystallization behavior in the material of the component; and the additive manufacturing process is executed with one of the at least two process parameters (A, B) being used during manufacturing a first of the at least two component volumes (CA1-CA3), resulting in a first recrystallization behavior in the first component volume, and with the other of the at least two process parameters (A, B) being used during manufacturing a second of said at least two component volumes (CA1-CA7), resulting in a second recrystallization behavior different from said first recrystallization behavior, in the second component volume; and the manufactured component is subjected to a heat treatment (HT), with a holding temperature (T_HT), wherein the holding temperature (T_HT) lies above a recrystallization temperature of at least one of said at least two component volumes.
Abstract:
The invention relates to a method for producing a three-dimensional article or at least a part of such an article made of a gamma prime (γ′) precipitation hardened nickel base superalloy with a high volume fraction (>25%) of gamma-prima phase which is a difficult to weld superalloy, or made of a cobalt base superalloy, or of a non-castable or difficult to machine metal material by means of selective laser melting (SLM), in which the article is produced by melting of layerwise deposited metal powder with a laser beam characterized in that the SLM processing parameters are selectively adjusted to locally tailor the microstructure and/or porosity of the produced article or a part of the article and therefore to optimize desired properties of the finalized article/part of the article.
Abstract:
The invention relates to a method of post-built up heat treatment of an additively manufactured high strength component made of a gamma-prime strengthened superalloy based on Ni or Co or Fe or combinations thereof. An application of a rapid heating-up rate of 25 to 60° C./min in a specific temperature range during the first post-built heat treatment after additive manufacturing avoids or at least minimizes the gamma-prime precipitation in the component during heat-up. This results in crack-free components/articles compared to significant cracking present in conventionally heat treated components.