3 edition of Heat treatment of gray iron found in the catalog.
Heat treatment of gray iron
Charles Owen Burgess
|Statement||by C.O. Burgess.|
|The Physical Object|
|Pagination||117, vi p. :|
|Number of Pages||117|
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CAST IRONS - HEAT TREATMENT Grey Iron Grey irons are amenable to normal heat treatments applied to steel as the metallic matrix of the grey irons is considered as steel. Thus improvement in machinability, strength, dimension stability is achieved through heat treatments involving stress-relief annealing, annealing, hardening and tempering.
Cast Iron: Physical and Engineering Properties describes the importance of iron and its properties, as well as the process of casting in the different fields of engineering. The book covers topics such as the mechanical, physical, and electrical properties of iron and the different tests under which it is subjected; the effects of heat treatment on gray cast iron; and the resistance of cast iron to heat.
The most common heat treatments of gray iron are annealing and stress relieving. Chemical composition is another important parameter influencing the heat treatment of gray cast irons. Silicon, for example, decreases carbon solubility, increases the diffusion rate of carbon in austenite, and usually accelerates the various reactions during heat treating.
For gray and nodular cast iron it is noticeable that no changing in microstructure within heating for one hour at °C because the matrix in both cast iron types is ferrite, therefore no changing in mechanical properties under heat treatment process with time of one hour which is not sufficient to decomposition of graphite, but with comparison the hardness of gray cast iron Author: Mohamed A.
Gebril, Aldlemey, Farag I. Haider. Heat Treatment of Grey Irons | Cast Irons | Metallurgy Stress Relieving: It is practically impossible to produce a casting from Annealing: Annealing is performed mainly to soften the castings in order to improve their Normalising: Normalising may be used to increase the mechanical properties.
ASM Specialty Handbook: Cast Irons. Joseph R. Davis malleable iron Fifi filler metal flake graphite foundry fracture toughness furnace grade graphite graphite iron gray cast iron gray iron growth hardening hardness heat treated heat treatment high-chromium high-silicon higher increase inoculation machining magnesium malleable iron manganese /5(5).
Ductile iron is heat treated to improve strength and wear. Gray iron is heat treated to improve wear, but will show little improvement in strength. Both gray and ductile iron need to be tempered (softened) after quenching.
Tempering to 45 – 50 Rc will result in optimal wear resistance and material toughness. The. Although the majority of gray iron castings are used in the as-cast condition, gray iron is heat treated for a variety of reasons, such as to relieve residual stresses, improve machinability, increase the hardness of the surface either through induction or flame hardening, or harden the entire section through an oil quench and draw treatment.
ASTM specification A 48 classifies gray irons in terms of tensile strength. The usual microstructure of gray iron is a matrix of pearlite with graphite flakes dispersed throughout.
Section sensitivity effects are used in the form of a wedge test in production control to judge the suitability of an iron for pouring a particular casting.