%0 Journal Article %T EFFECT OF WAVY GRAIN BOUNDARY ON CREEP FRACTURE BEHAVIOUR IN ASTROLOY ALLOY
%A GUO Guixiong %A CAI Qigong %A SHEN Huiwang %A
%J 金属学报 %D 1983 %I %X By comparing the measurement and the prediction of the creep crack initiation life at the sharp notch root, it is demonstrated that the creep J~*-integral is the effective parameter controlling the asymptotic field at the tip of the notch (and so the crack). Accordingly, a combined analysis on the linear damage model and the HRR singularity is carried out and an expression for the creep crack growth rate is derived as:da/dt=Ba k/n+1 D(x_0)J~* kn/n+1which is in good agreement with the experimental results of material with smooth and wavy grain boundaries. A microscopic mechanism of the creep damage in the material with the wavy grain boundaries has been discussed from the view point of the cavity formation along the grain boundary. %U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=34F9DA53B5ED9E5FAC62DCACB9408529&yid=A7F20A391020FDEE&vid=2A8D03AD8076A2E3&iid=B31275AF3241DB2D&sid=FC0714F8D2EB605D&eid=EA389574707BDED3&journal_id=0412-1961&journal_name=金属学报&referenced_num=0&reference_num=1