A dissimilar welded joint of Inconel 718 and 304L austenitic stainless steel was prepared using a combined procedure with the gas tungsten arc welding shielded metal processes by employing Ni-based fillers: ERNiCr-3 ENiCrFe-3. The joints were investigated for metallographic testing mechanical properties, relationship established between microstructure resultant properties. Microstructural obser...

Abstract During the last few years, additive manufacturing has been more and extensively used in several industries, especially aerospace medical device fields, to produce Ti6Al4V titanium alloy parts. Selective Laser Melting (SLM) process, heterogeneity of finished product is strictly connected scan strategies building direction. An optimal managing latter parameters allows better control defi...

There were investigated properties of WMD, especially metallographic structure, toughness and fatigue strength of welds with various oxygen amount. The connection between the properties of welds with the content of oxygen in WMD were carried out. The research results indicate that it should be limited oxygen content in steel welds. Subsequent researchers could fi nd more precisely the most bene...

This lecture aims at providing a survey of the metallographic techniques available for the examination of aluminium and its alloys. The information must be sufficient to be sure that the students and the users are able to choose the most suitable technique to solve their problems in the examination of samples. The lecture should contain a direct understanding of the main problems in the metallo...

In general the SEM sample preparation techniques are more or less similar to the metallographic sample preparation technique for optical microscopy, because both the microscopes reveals the surface topography of sample. In SEM a focussed beam of electrons scans over the specimen surface and the electrons emitted from the sample surface controls the brightness of the CRT spot which also scans th...

The article deals with mechanical properties of layers which were created by plasma nitriding technology. Nitrided layers apply to steel AISI 4140 were evaluated by metallographic method, GDOES method, microanalysis method and microhardness method. The trend of mechanical properties was experimentally obtained in dependence on length of cavity during plasma nitriding process. Moreover, the infl...

An investigation into the mechanisms of failure of current Björk-Shiley cardiac valve prostheses is reported. Two failed valves, one apparently unfailed but defective valve, and one unused valve, were examined by scanning electron microscopy and metallographic section. In the first two valves (removed 12 and 23 months after implantation) fracture was associated with the welds joining the short ...