Influence of surface quality and porosity on fatigue behaviour of Ti-6Al-4V components processed by MIM

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

卷:527

Article

Ferri, O. M.¹  Ebel, T.¹  Bormann, R.¹ 

[1] Mat Res Inst, GKSS Res Ctr, D-21502 Geesthacht, Germany

关键词: MIM;    Four-point bending fatigue;    Ti-6Al-4V alloy;    Binder content;    Sintering temperature;   

DOI  :  10.1016/j.msea.2009.11.007

来源: Elsevier

【 摘 要 】

Fatigue and tensile mechanical properties of Ti-6Al-4V alloy processed by metal injection moulding (MIM) technology were evaluated in this investigation. Two critical parameters, binder content of the feedstock and maximum sintering temperature, were studied. Samples sintered at 1350 degrees C exhibited higher tensile strength than those sintered at 1250 degrees C. Higher content of binder promoted an increase of the surface quality of MIM components. Consequently, the fatigue endurance limit increased from similar to 350 MPa (components with lower binder content) to similar to 400 MPa (samples with a higher binder content). Furthermore, reduction of ductility was observed for changing from closed to open porosity; however, the fatigue resistance did not follow the same trend. This is probably due to the fact that better surface quality and smaller grain size compensated the negative influence of porosity on the fatigue behaviour. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

Free