-Hardfacing is one of the most useful and economic ways to improve the performance of components submitted to severe wear conditions. A study was made to compare the microstructure and abrasion resistance of hardfacing alloys reinforced with primary chromium carbides, the hardfacing alloys were deposited onto M.S. plate by SMAW process. Two different commercial hardfacing electrodes were employ...

Intergranular corrosion (IGC) can be defined as the phenomena in which the corrosion rate of the grain boundary is higher than that of the bulk grain body. Austenitic stainless steels can become “sensitized” to this type of corrosion when the bulk metal experiences a temperature excursion above that necessary to make chromium carbides dissolve. As the metal cools, chromium carbide preferentiall...

Abstract A high-vanadium alloy composite layer was prepared on the surface of a carbon steel using cast technology, and wear properties were investigated. The results showed that microstructure composed primary vanadium carbides (VC), flake martensite, residual austenite, fine VC. hardness 63 HRC. abrasive resistance impact increased by 60% 26%, respectively, compared with those high-chromium i...

PURPOSE The aim of this investigation was to measure the temperature increase due to heat transferred to the implant-bone interface when the abutment screw channel is accessed or a metal-ceramic crown is sectioned buccally with diamond or tungsten carbide bur using an air rotor, with or without irrigation. MATERIALS AND METHODS Cobalt-chromium copings were cemented onto straight titanium abut...

Purpose: of this paper is the effect of the soft annealing of initial microstructure of the 6Mn16 steel on the kinetics of the austenite formation during next intercritical annealing. Design/methodology/approach: Analytical TEM point analysis with EDAX system attached to Philips CM20 was used to evaluate the concentration of Mn, Ni and Cr in the microstructure constituents of the multiphase ste...

housands of orthodontic practitioners around the world currently recycle brackets, tubes, and bands. Nearly all recyclers, whether commercial companies or private clinicians, use heat and electropolishing. Heat is necessary not only to decontaminate and sterilize orthodontic attachments, but also to remove the adhesive's polymeric matrix. Heating stainless steel to between 350° and 800°C (650-1...

The methodology of calculating parameters the primary and secondary non-metallic inclusion formation in thermite alloys is offered. regularities growth time form corundum depending on its size, mass quantity are analysed. It shown that alloy obtained by self-propagating high-temperature synthesis, average size inclusions, surrounding heterogeneous inclusions chromium carbide, 15.4 ?m. during pr...

New methods of diffusion metallization AISI W1-7 steel have been developed. The paper proposes a comparative analysis the properties and characteristics after three chemical heat treatment: nitriding, nitrogen titration by physical deposition from gas phase, chromium plating with subsequent titanium alloys. results are presented as comprehensive coatings: metallographic, micro-X-ray spectral, X...

In this study, the effect of chromium carbide (Cr7C3) on abrasive wear behavior of Fe-C-Mo-FeCr composite was investigated. Composite, which was produced by a powder metallurgy route was containing 3 wt.% Mo, 1.5 wt. % C and 4,8,12 wt. % FeCr with the different particle sizes. In the experiments, wear resistance of samples were determined using different loads by a pin on disc wear tester. Micr...

Precession electron diffraction has seen a fast increase in its adoption as a technique for solving crystallographic structures as well as an alternative to conventional selected-area and converged-beam diffraction methods. One of the key issues of precession is the pivot point alignment, as a stationary apparent beam does not guarantee a fixed pivot point. A large precession tilt angle, along ...