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Fracture behaviour of slightly hypereutectoid steel with different degree of spheroidization
Author(s) -
Toribio J.,
González B.,
Matos J. C.
Publication year - 2014
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/ffe.12167
Subject(s) - cementite , pearlite , materials science , microstructure , eutectic system , ledeburite , fracture (geology) , fracture toughness , isothermal process , metallurgy , composite material , austenite , physics , thermodynamics
This paper analyses how the microstructure influences the fracture behaviour of a steel with quasi‐eutectoid composition (slightly hypereutectoid) and pearlitic microstructure, when subjected to different spheroidization processes by means of isothermal treatment of pearlite at 700 ºC and different spheroidization times. Results indicate that the fracture toughness decreases with the degree of spheroidization, strongly at the beginning and with quasi‐linear trend later. The fracture surface shows an initial fibrous region formed by microvoids, originated in the pearlitic microstructure by fracture of cementite lamellae and in the spheroidized microstructure from the large cementite particles in the proeutectoid layer (by matrix decohesion or fracture), followed by unstable fracture by cleavage.