Guest Editorial: Tribocorrosion 2009: East meets West

The 2nd International Symposium on TriboCorrosion held on the 17th and 18th of March 2009, at the Austrian Center of Competence for Tribology, Wiener Neustadt, was a seamlessly smooth transition from the colour of vibrancy of India where the 1st International Conference in TriboCorrosion was held in 2006, to the spectacular beauty of the scenery of Austria. Starting on March 17th, St Patrick's day, the organizers were hoping for the "rub of the green" (the luck of the Irish) and what emerged during the conference, a collective and lively gathering of new and established researchers, certainly lived up to its expectations. The aim of this symposium was not only to assemble specialists in this subject from across the world to address ongoing research issues but also to contemplate education transfer of knowledge and technical innovation, and imbue our young people in the area with an enthusiasm for the topic

Simulation and optimum design of journal porous metal bearing under elastohydrodynamic lubrication

With some new simulation methods and software tools it is possible to make qualitative analysis of sliding bearing behavior taking elastic deformations in account. This paper presents simulation and structural optimization of journal porous metal bearing under complex load distribution. Surface of porous metal bearing is loaded inside with pressure distribution that is calculated by hydrodynamic lubrication theory. Besides there is also frictional force loading inner surface and nonuniform temperature distribution on bearing volume. The structure analysis is made for each kind of load separately and for complex load distribution of bearing. This simulation is realized by finite elements method (FEM) in structure analysis module of CATIA V5 software. Based on this simulation in second part of paper is given parameter optimization of porous metal bearing with taking elastic deformations of bearing shell into account

Simulation and optimum design of journal porous metal bearing under elastohydrodynamic lubrication

With some new simulation methods and software tools it is possible to make qualitative analysis of sliding bearing behavior taking elastic deformations in account. This paper presents simulation and structural optimization of journal porous metal bearing under complex load distribution. Surface of porous metal bearing is loaded inside with pressure distribution that is calculated by hydrodynamic lubrication theory. Besides there is also frictional force loading inner surface and nonuniform temperature distribution on bearing volume. The structure analysis is made for each kind of load separately and for complex load distribution of bearing. This simulation is realized by finite elements method (FEM) in structure analysis module of CATIA V5 software. Based on this simulation in second part of paper is given parameter optimization of porous metal bearing with taking elastic deformations of bearing shell into account

Tantalum-modified Stellite 6 thick coatings:microstructure and mechanical performance

<p>Thick Co-based coatings with different contents of tantalum were prepared by simultaneous powder feeding laser cladding technique on 304 stainless steel substrate, with the Ta wt% being 0, 2, 7 and 12. Laser processing was carried out with a continuous 3.3 kW Yt:YAG fiber laser. Microstructural observations were executed using scanning electron microscopy, energy dispersive X-ray spectroscopy analysis, and transmission electron microscopy. Observations indicated that, with an increase in the Ta contents, the Ta-rich MC-type carbides were formed in interdendritic regions. Also, hexagonal M7C3-type carbides were formed instead of orthorhombic M7C3-type carbides. The orientation relationships between different phases and the matrix were determined by electron diffraction. Mechanical properties were determined using microhardness measurement at room temperature and wear resistance measurement at room and elevated (500 A degrees C) temperatures. The research demonstrated that alloying any amount of tantalum, in spite of increasing the microhardness, could be detrimental for increasing the wear resistance of Stellite 6, both at room and elevated temperatures. The relationship between microstructure and mechanical properties is explained.</p>