High temperature alloys are divided into three types of materials: 760℃ high temperature materials, 1200℃ high temperature materials and 1500℃ high temperature materials, with a tensile strength of 800MPa. In other words, it refers to high temperature metal materials that work for a long time under 760-1500℃ and certain stress conditions. They have excellent high temperature strength, good oxidation and thermal corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. It has become an irreplaceable key material for the hot end components of military and civilian gas turbine engines.
Casting high-temperature alloy refers to a type of high-temperature alloy that can or can only be used to form parts by casting. Its main features are:
1. It has a wider range of composition. Since it is not necessary to take into account its deformation processing performance, the design of the alloy can focus on optimizing its use performance. For example, for nickel-based superalloys, the γ'content can be adjusted to 60% or higher by adjusting the composition, so that the alloy can still maintain excellent performance at a temperature as high as 85% of the melting point of the alloy.
2. It has a wider application field. Due to the special advantages of the casting method, it is possible to design and manufacture near-net-shape or no margin superalloy castings with arbitrary complex structures and shapes according to the needs of the parts.
High-temperature alloy powder is a product manufactured by a production process of atomized high-temperature alloy powder, formed by hot isostatic pressing or hot isostatic pressing, and then forged. Adopting powder metallurgy technology, due to the fine powder particles and fast cooling rate, the composition is uniform, there is no macro segregation, and the crystal grains are fine, the hot working performance is good, the metal utilization rate is high, and the cost is low, especially the yield strength and fatigue performance of the alloy. Great improvement.