In order to assess the integrity of welded pressure vessel containing a crack, behavior three-point bending specimens made HSLA steel joint are tested at -40°C, and their fracture behaviour analyzed, as conservative measure crack resistance. Specimens were low-alloyed NIONIKRAL 70, by SAW process. Surface notches machined electro-erosion method in parent metal (PM), heat affected zone (HAZ) wel...

Direct metal SLS processes use a high power laser beam to selectively fuse fully metallic powder to directly produce functional metal components or tooling. As a thermal dynamic process, it inevitably causes thermal stresses, stress-induced deformations and cracking. Understanding these is very important in controlling residual stresses and stress-induced deformations. In this research, the res...

Exposure of the engine valve to high temperatures led degradation material due microstructural instability and deteriorating mechanical properties. Performance enhancement alteration in microstructures can be attained through powder metallurgy route which is a viable method produce near net shape components. In this current study, development austenitic stainless steel (21-4N) as an alternate f...

T. Wyleciał, H. Radomiak, D. Urbaniak, Częstochowa University of Technology, Czestochowa, Poland The use of coal in the steel industry, similarly as in the whole national ec onomy, is often preceded by its pre-treatment. Coal is mined in the form of big solids, but, being in such a form, it can’t be combusted, sintered, or gasifi ed. Therefore, it needs t o be appropriately grinding. In the pap...

In this work, AISI 4340 steel was produced by powder metallurgy. Samples were sintered at 1150?C for 90 min. and then cooled in the furnace. Except to those as-sintered condition, one of samples homogenized 1 h air. Other deformed temperature range 1150-930?C deformation rate 30 60% followed cooling sand, air water mediums. The grain size gradually decreased depending on or steel. Small grains ...

Low‐alloyed steels are used for a variety of different applications like bearings or gears. Additive manufacturing technologies directed energy deposition (DED‐LB/M) allow fast and close‐to‐contour fabrication sophisticated products without excessive waste material. However, the DED‐LB/M process cannot be considered as state‐of‐the‐art this group materials. This study presents findings on mater...

The world standards for conventional ceramic hardness have varying requirements for control of loading rate during the indentation cycle. A literature review suggests that loading rate may affect measured hardness in some instances. In view of the uncertainty over this issue, new experiments over a range of indentation loading rates were performed on a steel, sintered silicon carbide, and an al...

Within the scope of increase in cutting tools efficiency, a CW CO;! laser beam has been used for butt welding sintered tips containing cobalt and tungsten carbide to a medium carbon steel core. After optimization of the laser processing conditions, full penetrating, sound and homogeneous welds are observed. Hardness is found to be nearly constant across the entire weld bead cross-section. Micro...

Sintered stainless steel (SSS) microfiltration membranes, which served as electrode directly, were used for the experiment of separating Alamin, a calcium salt and protein containing particles, found in dairy processing. Fouling and cleaning of the SSS membranes under the application of an external electric field were studied. The imposed electric field was found, diverging the pH of permeate a...