Directional crystalline high temperature alloys

Directional crystalline high temperature alloys are alloys with columnar grains developed on the basis of cast high temperature alloys. The columnar grains have a preferred orientation of [001], and the mechanical properties are superior in the direction parallel to the [001] crystallization direction, which generally makes the [001] direction parallel to the stress axis of the part, and the physical properties also show anisotropy. The microstructure consists of dendrites or crystals arranged parallel to the [001] direction. The creep, mechanical fatigue and hot and cold fatigue properties of these alloys are significantly higher than those of the corresponding cast high temperature alloys.

The preferred orientation of the columnar crystals is [001], and the mechanical properties are superior in the crystallographic direction parallel to [001], which generally makes the [001] direction parallel to the stress axis of the part, and the physical properties also show anisotropy. The microstructure is composed of dendrites or crystals arranged parallel to the [001] direction. The creep, mechanical fatigue and hot and cold fatigue properties of these alloys are significantly higher than those of the corresponding cast high temperature alloys.

Directional crystalline high temperature alloys are produced by precision casting technology and high speed solidification method in a directional crystallization furnace with unidirectional heat flow.

Nickel-based directional crystallization high-temperature alloys have been widely used, mainly in gas turbine turbine blades. Iron-nickel and cobalt-based high-temperature alloys can also be made into directional crystallization high-temperature alloy parts, with correspondingly improved performance.