tailieunhanh - Ductile Iron Episode 4

Tham khảo tài liệu 'ductile iron episode 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SECTION V ALLOY DUCTILE IRONS SECTION V Figure 1850 Effect of silicon content on the critical temperature in cast irons. TEMPERATURE Figure TIME h Effect of silicon on the oxidation of ferritic Ductile Iron in air at 650 C 1200 F . ALLOY DUCTILE IRONS Introduction SILICONMOLYBDENUM DUCTILE IRONS Effect of Silicon Three families of alloy Ductile Irons - austenitic high nickel - Ni-Resist bainitic and ferritic high silicon-molybdenum have been developed either to provide special properties or to meet the demands of service conditions that are too severe for conventional or austem-pered Ductile Irons. While conventional and austempered Ductile Irons contain limited percentages of alloying elements primarily to provide the desired microstructure alloy Ductile Irons contain substantially higher levels of alloy in order to provide improved or special properties. The high silicon levels combined with molybdenum give the ferritic Ductile Irons superior mechanical properties at high temperatures and improved resistance to high temperature oxidation. The high nickel content of the austenitic Ductile Irons in conjunction with chromium in certain grades provides improved corrosion resistance superior mechanical properties at both elevated and low temperatures and controlled expansion magnetic and electrical properties. Bainitic irons are used where high strength and good wear resistance are obtainable in either the as cast state or heat treated using from 1-3 alloy Ni and Mo . The bainitic irons are not as widely used as the austenitic or Si-Mo Ductile Irons so they will not be covered in this chapter. The reader is encouraged to contact US for more information or consult other publications such as the Iron Castings Handbook available through the American Foundrymen s Society. Alloy Ductile Irons containing 4-6 silicon and or molybdenum were developed to meet the increasing demands for high strength Ductile Irons capable of operating at high temperatures in .

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