tailieunhanh - Ductile Iron Episode 3

Tham khảo tài liệu 'ductile iron episode 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SECTION IV AUSTEMPERED DUCTILE IRON SECTION IV Figure MPa ksi _ 250 1600 - 1400 - 200 1200 - 1000 - 150 800 - - 100 600 - 400 - 50 200 - RANGES OF PROPERTIES Ferrite 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 5 10 15 20 25 0 0 ELONGATION Tensile properties of ADI and conventional Ductile Iron. Figure Fracture toughness of ADI and conventional Ductile Iron. AUSTEMPERED DUCTILE IRON Introduction What material offers the design engineer the best combination of low cost design flexibility good machinability high strength-to-weight ratio and good toughness wear resistance and fatigue strength Austem-pered Ductile Iron ADI may be the answer to that question. ADI offers this superior combination of properties because it can be cast like any other member of the Ductile Iron family thus offering all the production advantages of a conventional Ductile Iron casting. Subsequently it is subjected to the austempering process to produce mechanical properties that are superior to conventional Ductile Iron cast and forged aluminum and many cast and forged steels. Figures and compare the mechanical properties of ADI to those of conventional Ductile Irons. Figure also provides a comparison between the tensile strength-elongation relationships for the ASTM A897 ADI specification and that of the ASTM A536 specification for conventional Ductile Iron. These and other Ductile Iron specifications are discussed in further detail in Section XII. Compared to the conventional grades of Ductile Iron ADI delivers twice the strength for a given level of elongation. In addition ADI offers exceptional wear resistance and fatigue strength. Figure shows the strength of Ductile Iron and ADI compared to cast and forged steels. Ductile Iron has commercially replaced as cast and forged steels in the lower strength region now ADI is finding SECTION IV Figure AUSTEMPERING TEMPERATURE F Effect of austempering temperature on the tensile properties of ADI. 4 -