Rotatable forged disc for a bladed rotor wheel and a method for manufacturing thereof

A bladed rotor wheel for a gas turbine engine comprising at least a rotatable forged disc, the rotatable forged disc comprising:

• a front surface and a back surface,
• at least one rim surface, and
• a plurality of projections located on at least a portion of at least one of the front or back surface,
• wherein:
• the forged disc is made from a nickel based alloy forging,
• the projections are discrete 3D printed features protruding outwards from the front surface and/or back surface, so that a discontinuity at an interface between the forged disc surface and the printed projections is provided,
• the projections are arranged forming a continuous bidirectional pattern so that a bulk heat transfer capability is created at the front and/or back surface, and
• the ratio of the distance between projections to the forged disc external radius is lower than 0.15, and
• wherein the projections are arranged forming:
• a triangular pattern every three projections, or
• a square pattern every four projections.