Austempered Ductile Iron (ADI) Process Development. Final Report January 1986-December 1988

摘要

Austempered Ductile Iron (ADI) has emerged as a new engineering material in the past few years. To prove the production feasibility of the ADI process, an extensive R and D program was needed. Gas Research Institute (GRI) recognized this need and contracted the Technical Center of Atmosphere Furnace Company to relate process variables with mechanical properties, to recruit field test partners for the development of actual components, and to develop novel and economical equipment concepts. The metallurgical properties of ADI are determined by two processes: casting, and heat treating. To determine the effects of these processes on the mechanical properties, castings of 12 different chemical compositions were subjected to varied heat treat cycles. Varying the austenitizing and austempering temperatures, vastly different mechanical properties were achieved in test castings and actual parts.