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Specialty Steels and Hard Materials. Proceedings of the by N. R. Comins and J. B. Clark (Eds.)

By N. R. Comins and J. B. Clark (Eds.)

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Extra resources for Specialty Steels and Hard Materials. Proceedings of the International Conference on Recent Developments in Specialty Steels and Hard Materials (Materials Development '82) Held in Pretoria, South Africa, 8–12 November 1982

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43 Ref. (f) Refs. (g) (Chilton & Barton, 1967; Shimizu & Okamoto, 1971) (Reisdorf, 1963) (Miller & Mitchell, 1965; Marcus, Schwartz & Fine, 1966; Pinard-Legry 1969; Drapier & co-workers, 1971) (Miller & Mitchell, 1965; Shimizu & Okamoto, 1971; Pinard-Legry, 1969; Garwood & Jones, 1966) (Bandi, Lutz & Melnick, 1969; Pinard-Legry, 1969; Drapier & coworkers, 1971; Banerjee & Hauser, 1968; Lambert & co-workers, 1970) (Chilton & Barton, 1967) (Drapier & co-workers, 1971; Lambert & co-workers, 1970; Boesch & Cowan, 1968).

They can be welded in any thermal condition (annealed and maraged) without preheating. These properties have led to the use of maraging steels in many demanding applications. ALLOYING ELEMENTS IN MARAGING STEELS The main alloying element in maraging steels is nickel. Its presence ensures formation of martensite, thus increasing the strength of the matrix; and it reduces the solubility of other alloying elements in the matrix. In addition, Ni reduces the resistance to dislocation motion in the lattice and the energy of interaction between the dislocations and the interstitials and it promotes stress relaxation which in turn decreases the proneness to brittle fracture (Perkas, 1970).

Maraging steels show some excellent properties in the annealed and' the fully heat treated conditions. The main properties which have made them so interesting as constructional steels are the high strength-to-weight ratio and their superior toughness at high strength levels. They also show a better resistance to hydrogen embrittlement and to stress corrosion cracking than most of the conventional alloyed steels. They can be welded in any thermal condition (annealed and maraged) without preheating.

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