|About this Abstract
||Materials Science & Technology 2011
||Processing, Microstructure and Properties of Cast Irons and Cast and Forged Specialty Steels
||Fracture and Fatigue Behavior of Austempered Malleable Irons
||Kei-Peng Jen, Sanket Deshmukh
|On-Site Speaker (Planned)
Fracture and bending fatigue studies were conducted on four different grades of Austempered Malleable Irons (AMIs). The original composition is 2.3%C, 0.04% Al, 0.085% Cu, 0.47% Mn, 0.065% Mo,0.04% Ni, 0.013% P, 0.77% S, 2.82% Si by weight. These four different grades of AMIs were heat treated by austenizing white iron and then austempering it at different temperatures. The hardness values of these four AMIs range from Rc=35 to Rc=53. One way bending fatigue tests were conducted on the AMIs using a stress ratio of 0.01 and the S-N curves were established. Tensile tests and metallurgical microstructure analyses were conducted. In addition, the fracture surfaces of tensile and bending fatigue specimens were also extensively studied by using the Scanning Electron Microscope(SEM)to study the failure mechanisms. Comparisons between equivalent austempered malleable irons and austempered ductile irons are made based on previous published data.
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