Nickel-based Ni-Cr-Si-B self-fluxing alloys are excellent candidates to replace cobalt-based in aeronautical components. In this work, metal additive manufacturing by directed energy deposition using a laser beam (DED-LB, also known as LMD) and gas-atomized powders material feedstock is presented potential route for the complex processing of these alloys. This research deals with advanced characterization obtained LMD study understanding their solidification paths strengthening mechanisms....

Inconel 738LC (IN738LC) is a nickel-based superalloy specially used in the hot section components of turbine engines. One its main drawbacks relies on cracking susceptibility when it manufactured by laser powder bed fusion (LPBF). This paper analyzes influence minor alloying element concentration tendency IN738LC LPBF. For that objective, samples were using two powders, which presented different elements (Si, Zr and B). It was shown crack very depending for their manufacturing. In fact,...

This work investigated the premature failure of a beam reinforcement made austenitic stainless steel AISI 310 used in entrance rolling furnace working continuously at cycles from 650 to 850 °C. Fracture surface and microstructural investigations allowed identify fracture mechanism as fatigue failure. The was probably initiated oxidized grain boundaries an early stage service life, when no microstructure degradation present, while most crack propagation occurred after precipitation secondary...

Reduced hot cracking susceptibility is essential to ensure the flawless manufacturing of nickel superalloys typically employed in welded aircraft engine structures. The precipitation strengthened alloy 718 mainly depends on chemical composition and microstructure resulting from thermal story. Alloy usually a solution annealed state. However, even with this treatment, cracks can be induced during standard industrial conditions, leading costly time-consuming reworking. In work, wrought...

In this present work, an assessment of eutectic modification based on thermal analysis was performed modified A356 alloy. The effect various cooling rates which were achieved by means casting samples with moduli in sand and metallic moulds investigated. Cooling curves recorded from thermocouples inserted the centre showed characteristic undercooling recalescence associated (Al)-Si modification. results that rate has a role observed level. Furthermore, differential included to determine...

Ni-Cr-Si-Fe-B self-fluxing alloys are commonly used in hardfacing applications; addition, they subjected to conditions of wear, corrosion, and high temperatures, but not casting applications. In this work, gravity is presented as a potential manufacturing route for these alloys. Three with different chemical compositions were investigated focus on microstructure characterization, solidification path, strengthening mechanisms. Phases precipitates characterized using field emission scanning...

Evaluation of solidification kinetics by thermal analysis is a useful tool for quality control Al–Si melts before pouring provided it rapid and highly reproducible. Series records made with standard cups are presented that show good reproducibility. They evaluated using Newton's like approach to get the instantaneous heat evolution from kinetics. An alternative way calculating zero line proposed which validated fact latent thus within 5% value calculated thermodynamic data. Solidification...

The necessity of preserving resources and to reduce environmental pollution makes light weight concepts highly interesting for the transportation market, with being essential newly developed electric hybrid vehicles. However, some components cannot be replaced only by aluminium, but need combined steel in order achieve desired mechanical characteristics. Therefore, there is great interest developing processes manufacture aluminium/steel structures that present a good bond.In work range...

The use of secondary aluminium is increasingly being promoted in the automotive industry for environmental reasons. purpose this study was to demonstrate that it possible obtain a recycled AlSi10MnMg(Fe) alloy with equal metallurgical quality primary AlSi10MnMg when an adequate melt treatment applied. consisted deoxidation, degassing and skimming accordance detailed procedure described article. qualities one two alloys were assessed using thermal analysis, density index test, macroinclusion...

El uso creciente de fundiciones esferoidales en aplicaciones tecnológicas hace que se busquen nuevos métodos para mejorar su comportamiento frente a la corrosión. Entre las distintas maneras abordar este problema, modificación composición química tiene un doble interés dado que, junto con aumento resistencia corrosión, pueden conseguir propiedades mecánicas mejoradas. Todo ello debe conseguir, además, sin aumentar manera significativa los costes producción. En trabajo presentan primeros...

Primary AlSi10MnMg alloy is the most widely used for manufacturing of vacuum assisted high pressure die castings (VPDC) with ductility requirements. In this alloy, soldering avoided by a Mn level (0.5 - 0.6 wt. %) while Fe kept low (< 0.25 %). Such combination guarantees that Al-Fe-Mn-Si intermetallic compounds are α-iron rich polyhedral or Chinese script type, which less harmful to ductility. However, secondary alloys cheaper and their production requires energy than one primary alloys....

In this work, weldability and hot cracking susceptibility of five alloy 718 investment castings in laser beam welding (LBW) were investigated. Influence chemical composition, with varying Si contents from 0.05 to 0.17 wt %, solidification rate, pre-weld heat treatment studied by carrying out three different tests, i.e., ductility, Varestraint, bead-on-plate after isostatic pressing (HIP) solution annealing treatment. Onset ductility drop was directly related the presence residual Laves...

Both thermal analysis (TA) and differential (DTA) have been used since long to evaluate latent heat release solid fraction evolution during solidification of metallic alloys. TA makes use cooling curves recorded under "natural" while DTA consists in recording the temperature difference between sample an inert reference a controlled cooling, i.e. at imposed constant rate. In both cases, is deduced from calculation as estimated by means transfer model. This paper provides comparison such...