%0 Journal Article
%T Z-parameter Method for Damage Evaluation in HK40 Steel
%A Li XING
%A Jie ZHAO
%A Fuzhong SHEN
%A Wei FENG
%A <br>Li
%A XING
%A Jie
%A ZHAO
%A Fuzhong
%A SHEN
%A Wei
%A FENG
%J 材料科学技术学报
%D 2007
%I 
%X A Z-parameter method is used to evaluate the damage process of HK40 austenitic steel. By using Z-parameter based on the Larson-Miller method, the nonlinear master curve of the log stress vs Larson-Miller parameter P can be expressed as: P=27.74-3.41gσ-0.032σ, and a family of curves parallel to the master curve can be written as: P=(27.74-Z)-3.41gσ-0.032σ, where Z represents the magnitude of the deviation from the master curve. According to the creep rupture data both from different segments of a serviced tube and from the same segment locations with different service time, the value of parameter Z has close relationship with the deterioration of creep rupture properties. The damage state of the samples is evaluated by monitoring the changes in natural frequency f and Young's modulus E, and the relationships between Z and the damage parameters are discussed.
%K Damage evaluation
%K Creep rupture
%K Austenitic steel
%K Z-parameter<br>HK40钢
%K 奥氏体钢
%K 蠕变破裂
%K 评价
%K Z-参数法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=9F435F8E3A38A808&yid=A732AF04DDA03BB3&vid=EA389574707BDED3&iid=38B194292C032A66&sid=C6EC7357BCACD3A4&eid=2E01F39B6CBD53DE&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=0&reference_num=27