Open Access Conference Proceedings

Abstract: Folding is a common industry practice. In this work we have studied the influence of some parameters such as (the radius of curvature of the matrix, the coefficient of friction between the punch and the specimen, the play between matrix and punch, the thickness of the specimen and the mesh of the specimen) on the deformations of the different zones of the specimen, by a numerical simulation of U-bending using the ABAQUS calculation code.The studied parameters will prove to be of relevant use for the design of the parts from the metal sheets, through the bending forming process. [..] Read more

Abstract: The article presents the finite-element modeling results of stranding, reduction, straightening and mechanical-thermal treatment (MTT) of prestressing strand (PSC strand). Computer models took into account the distribution of residual stresses formed at the preliminary stage of wire drawing. [..] Read more

Abstract: Development of technologies to produce the very fine structure is currently very intensively accelerated. Even in scientific research, it is recognized that precisely controlled forming processes, including special processes, enabling control of technological parameters with regard to the structure refinement, and tied with the strengthening of materials, currently had the highest gradient of utilization efficiency of the scientific research findings in practice. [..] Read more

Abstract: In this article a continuous severe plastic deformation (SPD) process entitled dual rolls equal channel extrusion (DRECE) for producing ultrafine-grained (UFG) microstructure of thin sheets is presented. The DRECE process combines conventional equal channel angular pressing (ECAP) process and continual CONFORM process, and it can be easily scaled for industrial use. [..] Read more

Abstract: Paper deals with tool steel of QRO90 Supreme type that was treated by four different heat treatments. Firstly only laser quenched, afterwards laser quenched with followed-up plasma nitridation, the third material was only nitrided by plasma and the last one was nitrided by plasma and subsequently laser quenched. [..] Read more

Abstract: The combination of different mechanical properties of tailor welded blanks (TWB-s) results in non-constant plastic flow and instability of the weld interface during forming. This is most marked when combining metal sheets of different thicknesses or sheets with significantly different plastic characteristics. [..] Read more

Abstract: Alloys used for the manufacture of various structures must be strong and easy to process. Under certain conditions, hydrogen can adversely affect the fracture characteristics of most structural alloys. [..] Read more

Abstract: These days is still increasing emphasis put on making the production process of sheet metal stampings, which are used in the automotive, aerospace or power industries, more accurate and fast. These aspects need to be proportionately respected with respect to the economic side of these components production and in light of still increasing environmental requirements. [..] Read more

Abstract: INCEFA-PLUS (INcreasing Safety in NPPs by Covering gaps in Environmental Fatigue Assessment) project characterized environmentally assisted fatigue of stainless steels in light water reactor environments. During this project more than 200 fatigue tests have been carried out in different laboratories across Europe in air and water environment. [..] Read more

Abstract: Current trend of long-term operation of NPP’s for more than 60 years requires assurance of its safety and reliability. One of the solutions how to extend service life of reactor pressure vessel (RPV) is thermal annealing, which became a verified technology and its application in nuclear industry was prompted mainly due to an inability of RPV exchange. [..] Read more

Abstract: Titanium-stabilized austenitic stainless steel 08Ch18N10T is often used in nuclear power facilities due to its favourable properties. Many parts of the primary circuit of VVER 440 and VVER 1000-type nuclear power plants are manufactured of this steel. [..] Read more

Abstract: This work is focused on the study of influence of additives manufacturing on material properties of AISI 316L steel. Comparison of the material properties of the plate produced by the selective laser melting (SLM) technology and the hot-rolled plate was performed not only on the results of tensile tests, but also on small punch tests, which is an evolving and promising testing method and will be implemented into standardized testing methods within EU soon. [..] Read more

Abstract: The problem of selecting a material with an extreme value of its performance using its anisotropy is considered. It is important for specialists of metallurgical profile to be able not only to select the material for realization of the set engineering task, but also to use its anisotropy, and to be able to determine the orientation of the material with the extreme value of its performance. [..] Read more

Abstract: Structural designs of the dynamically loaded welded structures are currently based primarily on the values of the parent base material fatigue life. Although it tries to capture the influence of the given process by using the safety constants of the notch effect both of the weld and the thermal influence, it is only a theoretical estimation. [..] Read more

Abstract: The aim of the work was to obtain information about the effect of hydrogen in pre-deformed samples made of TRIP 780 steel and during deformation, when retained austenite transforms into martensite. Electrolytic hydrogenation took place both under the simultaneous action of deformation and before the tensile test itself. [..] Read more

Abstract: This article is about the chemical composition and microstructure of the outer door handles of the TATRA 87. The TATRA 87 was produced between 1937 and 1950. [..] Read more

Abstract: In the present work, obtained billets from powder high-speed steel by the HIP method. Samples were tested at various speeds and degrees of hot plastic deformation, which are modeled on the Gleeble-3800 complex. [..] Read more

Abstract: Twin - roll strip casting is an advanced technology for production of thin strips with the thickness of several millimetres. Recent progress in twin - roll strip casting makes it possible to apply this technology for the production of grain oriented electrical steels (GOES). [..] Read more

Abstract: The aim of this paper is to describe the selected mechanical properties and microstructure of butt welded joints obtained by the hybrid Plasma+MAG method of S700 MC steel (high strength Re=700 MPa). The results of metallographic research of welded joints, microstructure of the weld and heat affected zone, hardness distribution and impact toughness are presented. [..] Read more

Abstract: The T24 steel grade has been frequently used for the construction of membrane walls in modern power plant boilers. This steel grade has been developed with the intention of welding without post weld heat treatment. [..] Read more