%0 Journal Article
%T Effects of Long-term Creep at Elevated Temperatures on Rupture Ductility in 9Cr-1Mo-V-Nb-N Steel
%A Lihui ZHU
%A Qinxin ZHAO
%A Haicheng GU
%A Yansun LUSchool of Materials Science
%A Engineering
%A Xi''an Jiaotong University
%A Xi''an
%A China
%A <br>
%J 材料科学技术学报
%D 1998
%I 
%X Besides the creep strength, creep ductility has also been recognized as an important material parameter, since low ductility is often associated with notch sensitivity and concomitant prema-ture failure, especially brittle fracture. Creep rupture data of 9Cr-1Mo-V-Nb-N show that the creep ductility decreases with decreasing stress at constant temperatures or with decreasing tem-perature at constant stresses. SEM and TEM were used to investigate the mechanism of creep brittleness. The results indicate that the decrease of rupture ductility after long-term creep is related to the decrease of mobile dislocation density, the coarsening and coalescence of carbides and the decrease of shear lip size.
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=324DC3CAB22330DB19158AE0A9B7BFA5&aid=4582646BDCC533A3&yid=8CAA3A429E3EA654&vid=F3583C8E78166B9E&iid=38B194292C032A66&sid=6ED15D8DCB279BC4&eid=D6354F61445E9456&journal_id=1005-0302&journal_name=材料科学技术学报&referenced_num=4&reference_num=0