Assessment of the Quality of 17-4 PH Stainless Steel Scrap-Based Investment-Casting Turbine Blades for the Geothermal Turbine Component Application

This paper discusses an investigation of the ability of investment casting to manufacture rotor turbine blades using scrap materials. The manufacture of stainless steel of 17-4 PH is chosen to demonstrate alloying processes using the scrap materials. The alloying of stainless steel is performed using material balancing technique to match the standard chemical composition of stainless steel 17-4PH.The mechanical properties of the prototype of stainless steel 17-4PH is tested using the uniaxial tensile test machine to obtain the tensile stress and the Brinell impact test is carried out to evaluate the hardness of the material obtained. To evaluate the quality of the casting of the turbine blade obtained, the X-ray radiography of the turbine blade prototype is performed. The result obtained in this study shown that it is possible to have recycled stainless steel 17-4PH to be used in producing turbine blades.