Stress distribution in mechanically surface treated Ti-2.5Cu determined by combining energy-dispersive synchrotron and neutron diffraction

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:527

Article

Maawad, E.¹  Brokmeier, H. -G.^1,2  Hofmann, M.³  Genzel, Ch.⁴  Wagner, L.¹ 

[1] Tech Univ Clausthal, Inst Mat Sci & Engn, Clausthal Zellerfeld, Germany

[2] GKSS Forschungszentrum Geesthacht GmbH, Inst Mat Res, Geesthacht, Germany

[3] Tech Univ Munich, Forsch Neutronenquelle Heinz Maier Leibnitz FRM I, Munich, Germany

[4] Helmholtz Zentrum Berlin BESSY, Berlin, Germany

关键词: Shot peening;    ball-burnishing;    residual stress;    synchrotron radiation;    neutron diffraction;    Ti-2.5Cu;   

DOI  :  10.1016/j.msea.2010.05.044

来源: Elsevier

【 摘 要 】

Mechanical surface treatments such as shot peening (SP) or ball-burnishing (BB) induce plastic deformation close to the surface resulting in work-hardening and compressive residual stresses. It enhances the fatigue performance by retarding or even suppressing micro-crack growth from the surface into the interior. SP and BB were carried out on a solution heat treated (SHT) Ti-2.5Cu. The investigations of compressive and balancing tensile residual stresses need a combination of energy-dispersive synchrotron (ED) and neutron diffraction. Essential for the stress distribution is the stress state before surface treatments which was determined by neutron diffraction. Results show that the maximum compressive stress and its depth play an important role to improve the fatigue performance. (C) 2010 Elsevier B.V. All rights reserved.

【 授权许可】

Free