Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2013;2:43-7 DOI: 10.1016/j.jmrt.2013.03.003
Original Article
Comparative study of mechanical properties using standard and micro-specimens of base materials Inconel 625, Inconel 718 and Ti-6Al-4V
Nikolai Kashaev, , Manfred Horstmann, Volker Ventzke, Stefan Riekehr, Norbert Huber
Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics/ACE-Centre, Geesthacht, Germany
Received 09 August 2012, Accepted 20 November 2012
Abstract

To improve innovative joining and deposition technologies for the construction of dissimilar joints, precise knowledge of the local mechanical properties of materials must be obtained. In the present article a comparative study of the tensile properties and fatigue behaviour in case of flat standard and micro-specimens of base materials Inconel 625, Inconel 718 and Ti-6Al-4V was accomplished. The aim of the study was to develop an efficient method for the investigation of the local mechanical properties by the use of micro-specimens subjected to electro discharge machining treatment and to obtain reliable tensile and fatigue test results. By the miniaturization of specimens a significant effect of roughness on mechanical properties was obtained. By considering a correction for the effective load-bearing cross-section the data obtained from micro-specimens are within 3% error with respect to standard specimen results. The results showed that the proposed technique can be successfully used to determine the tensile and fatigue properties of a small material volume.

Keywords
Micro-tensile Specimen, Micro-fatigue Specimen, Small Scale Testing, Size Effect, Local Tensile Properties, Local Fatigue Properties
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Corresponding author. (Nikolai Kashaev nikolai.kashaev@hzg.de)
Copyright © 2013. Brazilian Metallurgical, Materials and Mining Association
J Mater Res Technol 2013;2:43-7 DOI: 10.1016/j.jmrt.2013.03.003