The invention relates to a nickel-base alloy for high-temperature applications, advantageously for gas turbines, and to a process.
It has not been possible to date to produce absolutely crack-free components by means of additive manufacturing (SLM; SLS; by means of laser beams, but also by means of electron beams (EBM)), and so the development of alloys has been continued.
This problem is addressed and an alloy having specifications of crucial elements is defined, which results in crack-free components.
It is therefore an object of the invention to solve the abovementioned problem.
The object is achieved by an alloy as claimed and a process as claimed.
The dependent claims list further advantageous measures that can be combined with one another as desired in order to achieve further advantages.
The alloy elements have been chosen specifically in order to be able to manufacture crack-free components. The elements silicon (Si), boron (B), zirconium (Zr) and hafnium (Hf) are of particular significance here, and carbon (C) should likewise be noted. The process conditions, particularly in the EBM process, feature a high build temperature of 1173 K-1373 K over long periods of time. Depending on the component, several days are possible. These are unique conditions that are not encountered in other known processes, such as casting, forging, welding etc. In view of these conditions, the levels of the elements zirconium (Zr), hafnium (Hf) and silicon (Si) were reduced in order to lower or completely avoid the tendency of the alloy to undergo solidification cracking. This is based on a reduction in the content of liquid phase/eutectic in the temperature range from 1173 K to the build temperature with simultaneous establishment of a smaller solidification interval.
The change in the chemical composition is advantageously determined with the addition of process parameters: movement speed, movement strategy, trace distance, power, energy beam, layer thickness and/or build temperature, which enable crack-free production.
Advantages are:
The chemical composition of the relevant alloy is (in % by weight):
Number | Date | Country | Kind |
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10 2019 201 095.4 | Jan 2019 | DE | national |
This application is the US National Stage of International Application No. PCT/EP2020/050506 filed 10 Jan. 2020, and claims the benefit thereof. The International Application claims the benefit of German Application No. DE 10 2019 201 095.4 filed 29 Jan. 2019. All of the applications are incorporated by reference herein in their entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2020/050506 | 1/10/2020 | WO | 00 |