激光熔化沉积TC18钛合金的低周疲劳行为

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Published in中国有色金属学报：英文版 no. 9; pp. 2591 - 2597
Main Author 李真 田象军 汤海波 王华明
Format Journal Article
LanguageEnglish
Published 2013
Subjects
低周疲劳
激光熔化沉积
钛合金
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Bibliography:Low cycle fatigue （LCF） behavior of laser melting deposited （LMD） TC18 titanium alloy was studied at room temperature. Microstructure consisting of fine lamella-like primary α phase and transformed β matrix was obtained by double annealed treatment, and inhomogeneous grain boundaryαphase was detected. Fatigue fracture surfaces and longitudinal sections of LCF specimens were examined by optical microscopy and scanning electron microscopy. Results indicate that more than one crack initiation site can be detected on the LCF fracture surface. The fracture morphology of the secondary crack initiation site is different from that of the primary crack initiation site. When the crack grows along the grain boundaryαphase, continuous grain boundaryαphase leads to a straight propagating manner while discontinuous grain boundaryαphase gives rise to flexural propagating mode.
Zhen LI, Xiang-jun TIAN, Hai-bo TANG, Hua-ming WANG （Engineering Research Center of Ministry of Education on Laser Direct Manufacturing for Large Metallic Components, Beihang University, Beijing 100191, China）
43-1239/TG
titanium alloy; low cycle fatigue; laser melting deposition
ISSN:1003-6326