Selective laser melting (SLM) has been recognized as a pertinent process for manufacturing of complex geometries. Al 4047 has been manufactured in this study with different processing parameters of the SLM process to obtain the optimal parameters suitable for required applications, as well as to determine the effect of these parameters and post-processing heat treatment on mechanical properties. A unique Al-Si eutectic microstructure is obtained with Al dendrites growing in the scanning direction. Mechanical properties of the SLM manufactured Al 4047 are at par with those of conventionally manufactured alloy. These properties can be varied by changing the SLM process parameters which can help controlling the process cost depending upon required mechanical properties.

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Although composite materials like wood, vulcanized fiber and carbon reinforced plastic (CFRP) are already investigated by means of their mechanical properties, the abrupt fracture mechanism as well as the deformation behavior right before and after fracture has not been investigated. However, it is marginally investigated for CFRP because of the quite high fracture speed. The knowledge about the damage evolution as the crack start and propagation can help to improve the strength and sensitivity to fracture by improving the materials structure and to utilize these materials for structural applications. For the investigated materials, fracture happens abruptly as it is the nature of composites and the detailed fracture mechanisms could not be detected by conventional measurement techniques. Therefore, an innovative combination of testing devices is presented which is able to fill this gap. Tensile tests were performed to receive conventional stress-strain curves. At the fracture stage, a high-speed camera recorded the fracture process. This information could be combined with digital image correlation (DIC) to visualize the deformation behavior. At the same time acoustic emission (AE) was used to detect the spectrum of mechanical vibrations which gives information about the released energy due to fracture. The challenging triggering of the high-speed camera was solved for each material individually. By using improved light sources, the recording speed could be set up to 2 million frames per second (Mfps). The investigations show different fracture mechanisms for each composite. Wood and vulcanized fiber were also investigated in different directions due to their anisotropy.

123 Production-and microstructure-based fatigue assessment of metallic AISI 304/430 multilayer materials produced by hot pack rolling B. Mitevski, S. Weiß and A. Fischer 130 In-situ tensile testing of notched poly-and oligocrystalline 316L wires 136 Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding S. Gach, A. Schwedt, S. Olschok, U. Reisgen and J. Mayer 148 Confirmation of tensile residual stress reduction in electron beam welding using low transformation temperature materials (LTT) as localized metallurgical injection-Part 1: Metallographic analysis T. Srinivasa Rao, G. Madhusudhan Reddy and S. R. Koteswara Rao 155 Investigation on variations in hardness and microstructure of in-process cooled 7075 aluminum alloy friction stir welds M. Farajian, V. Hardenacke, W. Pfeiffer, M. Klaus and J. R. Kornmeier 161 Numerical and experimental investigations on shot-peened high-strength steel by means of hole drilling, X-ray, synchrotron and neutron diffraction analysis G. Sun and Z. Zhou 166 Ultrasonic imaging of particle distribution in SiCp/Al composites 183 Finite element analysis of a vibration test bed frame J. Gülen and M. İskeçeli 188 Removal of methylene blue by using porous carbon adsorbent prepared from carbonized chestnut shell

This paper presents a preliminary research about a newly developed glass-steel composite created with diffusion welding of glass (C49-1) and carbon steel (St3sp). The main conclusions on the process of forming a diffusion zone during the welding of glass and steel are made. The results of quasi-static and cyclic mechanical tests and corrosion investigations are presented and interpreted on the basis of the microstructure developed during diffusion welding and described in this article. Keywords: hardening of glass, diffusion welding, glass-steel composite material, tensile tests, cyclic tests, fatigue, corrosion, microstructurê lanek predstavlja uvodne raziskave novo razvitega kompozita steklo-jeklo, izdelanega z difuzijskim varjenjem stekla (C49-1) in ogljikovega jekla (St3sp). Postavljeni so glavni zaklju~ki o postopku nastajanja difuzijske cone med varjenjem stekla in jekla. Na osnovi razvoja mikrostrukture pri difuzijskem varjenju so predstavljeni in razlo`eni rezultati kvazi stati~nih, cikli~nih mehanskih in korozijskih preizkusov. Klju~ne