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The aim of the research  is to study the effect of a two-stage heat treatment process of two iron based Ni-Co-Mo alloys on microstructure, micro-hardness and residual stress distribution. The laser cladding with multi-jet powder injection was used to deposit different alloys on the 12 % nickel maraging tool steel specimens 1.2799 (SIST EN 10027-2) to study the effect on the material's properties. In Ni-Co-Mo-1 austenite alloy, the precipitation hardening had no effect on hardness even after a prolonged overaging for 16 hours at 720 C. The second alloy Ni-Co-Mo-2 has a chemical composition similar to the maraging steel substrate. After 3 hours of precipitation hardening at 550 C, the alloy hardness increased to the level of base material. The residual stresses were measured using the hole drilling method. The residual stress profiles into the depth show predominantly tensile residual stresses in the Ni-Co-Mo-1 deposit and compressive residual stresses in the Ni-Co-Mo-2 deposit. The results indicate the importance of the chemical composition on microstructure, hardness and residual stresses prior and after heat treatment as well as of the quality of the deposited material on the maraging steel.

Heat Treatment Effects of Laser Cladded 12 Ni Maraging Tool Steel with Ni-Co-Mo Alloys *