This study focuses on the processability of four low-alloy steels (AISI 4130, 4140, 4340 and 8620) via laser-based powder bed fusion (LB-PBF). In as-built condition, alloys consisted tempered martensite that was result an intrinsic heat treatment (IHT) during LB-PBF. terms defects, a distinct transition in porosity observed correlated to volumetric energy density (VED). At low VED, specimens co...

The landing gear, which is one of the most important mechanical systems in aircraft, structure that exposed to loads, and critical loads aircraft throughout its life cycle. In addition fact gear system must have high strength these long life, performance, low volume, minimum weight, cost are criteria. For this purpose, optimum design created by making a structural analysis using finite element ...

Sol-Gel coatings are a good choice for protection and bioactivation of metals used as dentistry and standard surgical implant materials. These films should both prevent degradation of the substrates by wear or corrosion, and bioactivate the material for inducing the formation of a hydroxyapatite (HA) rich layer onto the material surface, thereby permitting a natural bonding to living tissues. T...

Accurately predicting the physical cutting process variables, e.g. temperature, velocity, strain and stress fields, plays a pivotal role for predictive process engineering for machining processes. These predicted field variables, however, are highly influenced by workpiece constitutive material model (i.e. flow stress), thermo-mechanical properties and contact friction law at the tool–chip–work...

The current experimental study is to investigate the effects of process parameters (cutting speed, feed rate and depth of cut) on performance characteristics (surface roughness, machining force and flank wear) in hard turning of AISI 4340 steel with multilayer CVD (TiN/TiCN/Al2O3) coated carbide insert. Combined effects of cutting parameter (v, f, d) on performance outputs (Ra, Fm and VB) are e...

The study the hardness, wear corrosion resistance of as-coating, heat treatment and plasma-nitriding Ni- B electroless coatings was deposit on 4340 steel. After procees coating, samples were in percentage hydrogen/nitrogen ratio (50%), temperature 400°C, at 4 hours compared with treatment. characterization by FESEM, XRD, microhardness, Corrosion Resistance surface roughness measurements. Microh...