Effect of heat-treatment conditions on the structure and physicomechanical and chemical properties of a Ni-Cr-Cu-Ti maraging steel / Bannykh O.A., Berezovskaya V.V. // Russian Metallurgy (Metally). - 2007. - V. 2007, l. 3. - P. 201-208.

ISSN:

00360295

Type:

Article

Abstract:

The effects of quenching (from 950°C or from 950 and 850°C) and the aging conditions on the structure, properties, and delayed fracture (DF) of 03Kh11N10M2DT maraging steel has been studied by dilatometry, X-ray diffraction, and fracture tests. The DF-crack growth rate is maximal after aging at 400°C irrespective of the quenching conditions, and the corrosion rate is maximal after aging at 350-400°C in the case of single quenching and at 350°C after double quenching. The kinetics and mechanism of the early stages of the decomposition of a supersaturated α solid solution are investigated by electrical-resistance measurements and transmission electron microscopy. In the state after single quenching, aging occurs in two stages at all isothermal heat treatments; in the state after double quenching, aging occurs in one stage at a time exponent n = 0.2 in the Johnson-Mehl equation. Upon aging at 400°C, the intermediate ordered Fe3(Ni,Ti) phase with a complex cubic lattice precipitates, and the intermetallic compound Ni3Ti precipitates upon subsequent aging. Moreover, copper-rich ε-phase precipitates form only in the case of single quenching. The substantial increase in the crack growth rate during DF with n < 0.2 is likely to be caused by the formation of Guinier-Preston zones enriched in nickel and titanium. © 2007 Pleiades Publishing, Ltd.

Author keywords:

Index keywords:

Aging of materials; Crack propagation; Fracture testing; Intermetallics; Quenching; Solid solutions; Supersaturation; X ray diffraction; Aging conditions; Crack growth rate; Maraging steel

DOI:

10.1134/S003602950703007X

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https://www.scopus.com/inward/record.uri?eid=2-s2.0-34548530667&doi=10.1134%2fS003602950703007X&partnerID=40&md5=c3f223e46c52b15753c9cb863ae20813

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Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-34548530667&doi=10.1134%2fS003602950703007X&partnerID=40&md5=c3f223e46c52b15753c9cb863ae20813
Affiliations	Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russian Federation; Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russian Federation
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Correspondence Address	Bannykh, O.A.; Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russian Federation; email: bannykh@ultra.imet.ac.ru
Language of Original Document	English
Abbreviated Source Title	Russ. Metall. (Metally)
Source	Scopus