Comparison of the Mechanical Properties and Wear Behavior of Compressor Crankshaft Materials: Ductile Cast Iron, ADI, and SSF
摘要
The microstructures, the mechanical properties including: tensile strength, yield strength, ductility, hardness, and impact energy and the wear resistance of compressor crankshaft ductile cast iron materials per EN 1563-2018 and DIN EN 1564 were studied. These included traditional ductile iron (DI) grade EN-GJS-600-3, the solid solution strengthened ferritic ductile iron (SSF) grade EN-GJS-600-10, and grade 1 (900-650-9 austempered ductile iron (ADI)). In addition, the microstructural properties (ferrite/pearlite amount, and nodule count) and hardness of crankshaft components having various section thicknesses are also investigated. Standard keel blocks and compressor crankshafts are produced via conventional sand cast technique. Among studied cast irons, ADI exhibits the best combination of mechanical properties with highest yield strength of 791 MPa, highest tensile strength of 1014 MPa, highest hardness of 285 HB, highest impact energy of 105 J, and good elongation of 10.7%. Among investigated cast irons, EN-GJS-600-10 grade SSF shows the best wear resistance with lowest wear loss (0.02 mm3) and smallest coefficient of friction (0.11). Traditional EN-GJS-600-3 DI shows the lowest yield strength, lowest elongation, lowest impact energy, and lowest wear resistance with highest wear loss of 0.69 mm3 and biggest coefficient of friction 0.43.