The scientific literature regarding additive manufacturing, mainly the material extrusion method, suggests that mechanical characteristics of parts obtained by this technology depend on a number input factors specific to printing process, such as temperature, trajectory, layer height, etc., and also post-process operations for parts, which, unfortunately, requires supplementary setups, equipment, multiple steps raise overall costs. Therefore, paper aims investigate influence direction,...

Abstract Continuous research in the field of metal additive manufacturing has led to need for constant improvement parameters especially case FDM (Fused Deposition Modeling) manufacturing. In recent years, main directions outlined productivity and quality were related higher printing speed use ironing-type processes. This article aims study dimensional accuracy surface FDM-manufactured 316L stainless steel. The degree novelty is given by application ironing process green part. A full...

In recent years, to reduce cars costs, research has been conducted on dual-phase steels with low manganese content (below 1.0%). This study investigated the influence of technological parameters heat treatment (heating temperature and cooling medium) such steels’ structures mechanical properties. The ferrite-martensitic structures, specific for steels, were obtained by intercritical quenching: heating samples (made alloys 0.511% Mn, respectively 0.529% Mn) temperatures located between...

The present paper aims to contribute the methodology of 3D printing in-process colouring and study its implications impact on tensile strength surface quality obtained parts. proposed was based a Taguchi L27 DOE plan using standardised EN ISO 527-2 type 1B-shaped specimens, in which four factors three levels were considered. results highlight possibility presented method. Different materials (PLA, PLA+, PETG) with varying infill densities (15%, 30%, 50%), colour distribution (33%, 66%, 99%),...

Background and Objectives: Resin composites represent a class of materials widely used in restorative dentistry due to patient demands for better aesthetics. Colour changes composite resins can occur intrinsic extrinsic factors. Beverages, such as vegetable juices, be some these The purpose this study was investigate the colour stability modification microhardness two resin before after immersion different juices. Materials Methods: (Gradia Direct Anterior-shade A2 Valux Plus-shade A2)...

The purpose of the paper is to accomplish kinematics study a direct coupling between two shafts with high pair joint, point-surface type. Due Hartenberg and Denavit, analysis spatial mechanisms can be made by well-known method, named "homogenous operators method". This manner applicable only for containing cylindrical pairs particular solutions: prismatic revolute pair. In order apply Hartenberg-Denavit procedure shafts, contact must previously replaced succession 5 pairs. It results system...

With this article, the authors present a number of technological characteristics determined for dual-phase steel with 0.09% C and 1.90% Mn. This was obtained through intercritical quenching: heating at 740, 780 820 ° C, maintaining 30 minutes then cooling in water, oil, oil magnetic field direct current (DC) ultrasonic field. It degree cold upsetting, ultimate tensile strength resistance butt welded joints cutting property based on study forces surface roughness; it analyzed influence heat...

In this article, the authors have analysed influence of quenching temperature (T Q ) on microstructure a dual-phase steel with low carbon and manganese content (0,094 % C 0,53 Mn). The ferrite-martensite structures, typical steels, has been obtained by intercritical that consisted heating at temperatures ranging between 750 ° 830 C, maintaining for 30 minutes cooling in water. After carrying out heat treatments, samples subjected to metallographic analysis through which volume fraction...

In this article, the authors have analysed influence of quenching temperature (T Q ) on mechanical properties a dual-phase steel with 0.094 % C and 0.53% Mn. order to obtain ferrite-martensite structure, specimens material been subjected intercritical that consisted heating at 750, 770, 790, 810 830 ° C, maintaining for 30 minutes cooling in water. These then metallographic analysis tensile test determine volume fraction martensite (V M ultimate strength (R m ), 0.2% offset yield p0.2 total...

This study allowed, by dilatometric analyses, both to highlight the solid state transformations that occurred during continuous heating of two hypoeutectoid steels, as well investigate effect rate on critical points at which these occurred. The eutectoid transformation (the pearlite dissolution into austenite) was carried out in a temperatures interval, ranging between start temperature ( Ac 1 ) and finish (denoted fp this article). Increasing determined displacement solid-state phase higher...

This paper presents the influences of quenching technologies (classical, with cooling in magnetic field, cryogenic, ultrasonic field) on dimensional stability time and contact fatigue behaviour some elements ball bearings made from 100Cr6 (RUL 1) steel. From analysis experimental data obtained it has resulted that use ultrasound for martensitic these steels ensures changes to properties favorable may represent an effective way increasing quality bearings; technology is relatively simple,...

The paper presents the estimation of effects mass eccentricity a rotating geometrical axisymmetric body upon experimental tribological results obtained through inclined plane methodology. first part steps for deducing nonlinear ordinary differential equation motion an with in pure rolling on plane. This is numerically integrated and effect moving time pointed out. aspects are presented second work. A new designed device, used accurately finding presented. solution rotor rigorously controlled...