Thermal fatigue life prediction. Verification of Coffin-Mansons´s Law in the Phase Transformation Range of Ferrite Matrix Ductile Cast Iron
Morihito Hayashi, Kanagawa, Japan
ABSTRACT For clarifying the behavior of thermal fatigue and verifying the role of Coffin-Manson's law in thermal fatigue, out-of phase type thermal fatigue tests were carried out on ferritic ductile cast iron. As a results of the tests, the dependence of thermal fatigue life and the plastic strain produced in each cycle on cyclic peak temperature and the dependence of thermal fatigue life on cyclic plastic strain were made clear. Particularly, the exponent and the coefficient in the latter relationship, i.e. Coffin-Manson's law, are kept constant over all ranges including phase transformation range. And it shows that the thermal fatigue life can be predicted by tensile the properties of specimen at room temperature. By the way, the microstructure and the fracture surface of failed specimens were observed and the mechanism of thermal fatigue is discussed here.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2004-7/8, pp -
Publisher: Carl Hanser Verlag München
© NDTnet
