Pre-treatment, method for additive production of a component, and device
A method for additive production and a correspondingly produced component made of a powdery base material, includes the thermal pre-treatment of the base material at a first temperature of at least 800° C. under an inert gas atmosphere, wherein the first temperature and a duration of the pre-treatment are further selected such that no sintering process of the base material occurs, subsequent cooling of the base material, and additive construction of the component from the thermally pre-treated base material. A corresponding device is for the additive production.
1. A method for additive manufacturing of a component from a pulverulent basic material for a nickel-based or cobalt-based superalloy, the method comprising:
thermally pretreating the basic material at a first temperature of at least 800° C. for a duration, wherein the first temperature and the duration of the pretreatment furthermore are chosen so that no sintering of the basic material arises wherein the basic material includes component parts that are selected from the group consisting of a boron compound, a carbon compound, a creator of a γ phase of a superalloy and combinations thereof;
subsequently cooling the basic material; and
additively constructing the component from the thermally pretreated basic material,
wherein the thermal pretreatment is carried out in so that that a diffusion length of component parts of the basic material at the first temperature is larger than a mean grain size of powder particles of the basic material.
2. The method as claimed in claim 1 ,
wherein the thermal pretreatment is carried out so that a segregation on grain boundaries of powder particles of the basic material is prevented, or
wherein the thermal pretreatment is carried out so that a segregation, of component parts, on grain boundaries of powder particles of the basic material is prevented.
3. The method as claimed in claim 1 ,
wherein the cooling of the basic material, includes cooling the basic material by way of a temperature gradient of at least 150 K/min to room temperature.
4. The method as claimed in claim 1 ,
wherein the duration of the pretreatment is at least two hours.
5. The method as claimed in claim 1 ,
wherein the pretreatment comprises heating of the basic material to a first temperature of at least 1000° C. by way of a temperature gradient of at least 5 K/min.
6. The method as claimed in claim 1 ,
wherein the pretreatment after heating to the first temperature, comprises cooling to a second temperature, and/or a temperature between 1100° C. and 1200° C., by way of a temperature gradient of at least 150 K/min.
7. The method as claimed in claim 1 ,
wherein the thermal pretreatment is carried out so that the basic material during cooling is imparted a martensitic transformation.
8. The method as claimed in claim 1 ,
wherein the thermal pretreatment is carried out in a device comprising a container for holding the basic material that includes a heating installation for heating the basic material and a cooling installation that cools the basic material.
9. The method as claimed in claim 1 ,
wherein the basic material is heated and/or cooled in a homogeneous manner during and/or after the thermal pretreatment.
10. The method as claimed in claim 3 , wherein the cooling is carried out by way of a temperature gradient of 200 K/min.
11. The method as claimed in claim 6 , wherein the pretreatment after heating to the first temperature, comprises cooling by way of a temperature gradient of 200 K/min.
12. The component as claimed in claim 1 , wherein the grain distribution has a mean grain size of less than 100 μm.