Effects of strain rate and matrix structure on transition of toughness of spheroidal graphite cast irons
作者:
NagaiK.,
KishitakeK.,
OwadanoT.,
期刊:
Materials Science and Technology
(Taylor Available online 1991)
卷期:
Volume 7,
issue 5
页码: 464-468
ISSN:0267-0836
年代: 1991
DOI:10.1179/mst.1991.7.5.464
出版商: Taylor&Francis
数据来源: Taylor
摘要:
Abstractensile, three point bendJc, and Charpy V-notch impact tests were carried out at various loading speeds and temperatures on ferritic, pearlitic–ferritic, and pearlitic spheroidal graphite cast irons. The 0·2% proof stress increased monotonically with decreasing temperature. Similar behaviour was observed for tensile strength, but the temperature range over which it occurred was limited. Both 0·2% proof stress and tensile strength were increased slightly by increasing the crosshead speed. The energy for fracture per unit volume in tensile tests was evaluated as the mean of the tensile strength plus proof stress multiplied by elongation. This energy reveals the ductile–brittle transition behaviour in the same manner asJcvalue or Charpy impact energy. An increase of loading speed shifted the transition curve of the energy for fracture to higher temperature, leaving the upper shelf value unchanged. An increase of pearlite volume fraction in the matrix also shifted the curves to higher temperature, decreased the upper shelf value, and reduced the slope of the transition curve. The transition temperatures of the energy for fractureJcvalue, and Charpy impact energy were found to be linearly related to the logarithm of strain rate.MST/1343
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