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SOME MECHANICAL CHARACTERISTICS OF NITROGEN STRUCTURAL STEELS
Author(s) -
Minchev Kiril
Publication year - 1992
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1992.tb00022.x
Subject(s) - materials science , fracture toughness , fracture (geology) , anisotropy , composite material , fracture mechanics , nitrogen , crystallinity , yield (engineering) , physics , quantum mechanics
In this paper, test conditions and microstructural factors have been investigated for newly developed nitrogen steels at load rates and test temperatures suitable for future operating conditions. Static tests have been carried out at ε∼ 10 −4 s ‐1 and dynamic tests at ε∼ 10 2 s −1 . Different test temperatures enable fracture mechanisms and fracture toughness variations to be studied. Anisotropy of some characteristics in the initial (non‐heat‐treated) state, together with heat treatment effects and structural changes under two load rates have been analysed. Fracture appearance transition temperature (FATT) values have been obtained from absorbed energy and fracture surface crystallinity values. Using yield strength and fracture toughness data, an estimate has been made of critical crack lengths for unstable fracture.