IN738LC High-temperature Alloy Overview γ′ phase precipitation-strengthened nickel-based high-temperature alloy is one of the major breakthroughs in the field of materials science. IN738LC is a high-end precipitation-strengthened nickel-based high-temperature alloy. Due to its high degree of alloying, the precipitation of the main thermally stable strengthening phase γ′ phase (Ni3(Al,Ti)), high chromium content (≥16wt%), it can still maintain its excellent mechanical properties at high temperatures up to 850°C, and is one of the alloys with the best thermal corrosion resistance. Therefore, IN738LC has excellent microstructural stability, high-temperature strength and excellent high-temperature oxidation resistance. It is widely used in aerospace, power generation and nuclear reactors. It is one of the ideal materials for manufacturing high-temperature parts such as aircraft engines and gas turbines. However, the high γ′ precipitation rate of IN738LC is extremely sensitive to cracks and is classified as a "difficult to weld" alloy. SLM additive manufacturing can directly integrate parts with complex shapes, but the SLM printing process has a large temperature gradient, fast cooling rate, repeated remelting, high residual stress, easy deformation and cracking, which brings challenges to the SLM printing of IN738LC materials for high-quality parts. It is very difficult to use this alloy to manufacture defect-free parts. Therefore, the huge contradiction between the high temperature performance and crack sensitivity of IN738LC nickel-based high-temperature alloy is a key problem that must be solved.