In the last years hardfacing became an issue of intense development related to wear resistant applications. Welding deposits can functionalize surfaces and reclaim components extending their service life.
Tool steels are widely used in hardfacing deposits to provide improved wear properties. Tensile and impact behavior of dissimilar weld joints of newly developed rotor steels 23CrMoNiWV88
and 26NiCrMoV145 were conducted at various temperatures below 350 C. Inhomogeneous microstructures and asymmetrical micro-hardness along the dissimilar welding joint were observed. With the
increase of temperature, strength decreased which was associated with the increased plasticity, and fracture location changed from weld metal (WM) to intermediate pressure (IP) base metal (BM) at around
300 C. Compared to the homogeneous impact specimen with two fracture zones at fracture surface, a
combined quasi-cleavage and ductile fracture mode with three zones is observed at the fracture surface
of the dissimilar weld joint when the testing temperature is in the range of 0–40 C. The occurrence of
separated zones are mainly ascribed to the multi-layer welding process and thus improved the impact
toughness of the welding joint.