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تجزیه و تحلیل شکست مهندسی
جزئیات رویداد
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  • uni-axial and multi-axial creep behaviour of p91-type steel under constant load

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    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 509
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the uni-axial and multi-axial creep behaviour of p91-type steel under constant load was studied. the conventional, uni-axial, constant-load creep tests were performed at initial stresses ranging from 120 mpa to 240 mpa, and at temperatures from 625 to 675 °c, while the multi-axial, small-punch, constant-load creep tests were performed at loads ranging from 350 n to 550 n, and at temperatures from 650 to 690 °c. both types of test can be considered as short-term creep tests because the maximum time-to-rupture was less than 500 h. since it is well known that the creep behaviour of p91-type steel cannot be satisfactorily described by a simple, arrhenius-type, power-law constitutive model, an improved stress-dependent, energy-barrier model was used for a description of the uni-axial as well as the multi-axial creep behaviour of the p91-type steel. it was found that the obtained values of the apparent activation energies qc during the uni-axial and multi-axial creep tests were very close, and in both types of test they were considerably higher than the activation energy for the lattice diffusion in iron.

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