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Use of the small punch test to determine the ductile‐to‐brittle transition temperature of structural steels
Author(s) -
CONTRERAS M. A.,
RODRÍGUEZ C.,
BELZUNCE F. J.,
BETEGÓN C.
Publication year - 2008
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.1460-2695.2008.01259.x
Subject(s) - charpy impact test , materials science , transition temperature , punching , fracture (geology) , brittleness , composite material , metallurgy , microstructure , superconductivity , physics , quantum mechanics
The small punch test (SPT) consists in punching very small square specimens, measuring 10 × 10 mm 2 and 0.5‐mm thickness, until fracture using a 2.5‐mm‐diameter hemispherical punch. Different specimens of a structural steel were tested from room temperature to cryogenic temperatures in order to determine its ductile‐to‐brittle transition temperature (DBTT). The DBTT obtained in SPT (DBTT STP ) is much lower than the DBTT obtained by means of Charpy specimens (DBTT CVN ). The variation of the mechanical parameters calculated from the SPTs with temperature was also calculated and the operative fracture micromechanisms defined using a scanning electron microscope.