Aging behavior and mechanical properties of maraging steels in the presence of submicrocrystalline Laves phase particles

Journal Article · Sat Oct 15 04:00:00 EDT 2011 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2011.07.012· OSTI ID:22066333

Mahmoudi, A ^[1]; Ghavidel, M.R. Zamanzad ^[1]; Nedjad, S Hossein ^[2]; Heidarzadeh, A ^[1]; Ahmadabadi, M Nili ^[3]

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1. Young Researchers Club, Ahar Branch, Islamic Azad University, P.O. Box 54516, Ahar (Iran, Islamic Republic of)
2. Faculty of Materials Engineering, Sahand University of Technology, P. O. Box: 51335-1996, Tabriz (Iran, Islamic Republic of)
3. School of Metallurgy and Materials Engineering, University of Tehran, P. O. Box: 14395-731, Tehran (Iran, Islamic Republic of)

Cold rolling and annealing of homogenized Fe-Ni-Mn-Mo-Ti-Cr maraging steels resulted in the formation of submicrocrystalline Fe{sub 2}(Mo,Ti) Laves phase particles. Optical and scanning electron microscopy, X-ray diffraction, tensile and hardness tests were used to study the microstructure, aging behavior and mechanical properties of the annealed steels. The annealed microstructures showed age hardenability during subsequent isothermal aging at 753 K. Ultrahigh fracture stress but poor tensile ductility was obtained after substantial age hardening in the specimens with 2% and 4% chromium. Increasing chromium addition up to 6% toughened the aged microstructure at the expense of the fracture stress by increasing the volume fraction of retained austenite. The Laves phase particles acted as crack nucleation sites during tensile deformation. - Highlights: {yields} Laves phases dispersed in a BCC iron matrix by annealing of cold rolled samples. {yields} The samples showed age hardenability during subsequent isothermal aging at 753 K. {yields} Ultrahigh fracture stress but poor ductility was obtained after age hardening. {yields} Increasing chromium addition toughened the aged microstructure. {yields} Laves phase particles acting as crack nucleation sites during tensile deformation.

• OSTI ID: 22066333
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 10 Vol. 62; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGE HARDENING
ANNEALING
AUSTENITE
BCC LATTICES
CHROMIUM ADDITIONS
CRACKS
DEFORMATION
DUCTILITY
FRACTURES
HARDNESS
LAVES PHASES
MARAGING STEELS
MATRIX MATERIALS
MICROSTRUCTURE
PARTICLES
ROLLING
SCANNING ELECTRON MICROSCOPY
STRESSES
X-RAY DIFFRACTION