tailieunhanh - Ductile Iron Episode 5

Tham khảo tài liệu 'ductile iron episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | SECTION VII HEAT TREATMENT SECTION VII TEMPERATURE 1000 800 600 400 200 p o TEMPERATURE Figure Examples of different heat treatments used to relieve stresses anneal and normalize Ductile Iron castings. Figure The iron-iron carbide binary equilibrium diagram. HEAT TREATMENT Introduction One reason for the phenomenal growth in the use of Ductile Iron castings is the high ratio of performance to cost that they offer the designer and end user. This high value results from many factors one of which is the control of microstructure and properties that can be achieved in the as-cast condition enabling a high percentage of ferritic and pearlit-ic Ductile Iron castings to be produced without the extra cost of heat treatment. To obtain the advantage of producing high quality castings as-cast requires the use of consistent charge materials and the implementation of consistent and effective practices for melting holding treating inoculation and cooling in the mold. By following these practices especially the use of high purity charges and late inoculation castings can be produced as-cast essentially free of carbides and with pearlite contents less than 10 in section sizes as low as in. mm . However heat treatment is a valuable and versatile tool for extending both the consistency and range of properties of Ductile Iron castings well beyond the limits of those produced in the as-cast condition. Thus to utilize fully the potential of Ductile Iron castings the designer should be aware of the wide range of heat treatments available for Ductile Iron and its response to these heat treatments. Ductile Iron castings may be heat treated to increase toughness and ductility increase strength and wear resistance increase corrosion resistance stabilize the microstructure to minimize growth equalize properties in castings with widely varying section sizes improve consistency of properties improve machinability and relieve internal stresses. This Section deals with heat .

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