Experimental and numerical investigations of oxide-related defects in Al alloy gravity die castings

Scampone, Giulia; Pirovano, Raul; Mascetti, Stefano; Timelli, Giulio

doi:10.1007/s00170-021-07680-5

Cited by 9 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this process, the "Molten Metal" is poured directly from a "ladle into a semi-permanent or permanent die", which is completely automated. To lessen oxidation and foaming, it is necessary to fill the die with the least amount of turbulence possible through one or more channels [6,7]. "Investment Casting" is a crucial process for generating "turbine blades with a near-net shape" because of the complexity as well as high volume manufacturing of these parts.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Manufacturing Process Selection Utilizing the TOPSIS Method

2023

jbab

View full text Add to dashboard Cite

Bancassurance. A bank and an insurance provider will enter into a "bancassurance" agreement so that the insurance provider can market to the bank's clients. The insurance provider gains from higher sales and a broader customer base without having to hire more salespeople. The marketing of insurance policies through banks is known as bancassurance. Cooperation between banks and insurance firms allows the bank to market its customers the insurance products of the associated insurance company. The Reserve Bank of India, which oversees the banking system, recognized that it was important for banks to diversify their business models and gave them permission to enter the insurance industry. In order for the insurance provider to market to the bank's customers, the bank another insurance provider will enter into a "bancassurance" agreement. More sales and a larger customer base benefit the insurance provider without the need to add more salesmen. Bancassurance refers to the sale of insurance products through banks. Banks and insurance companies can promote each other's insurance products to customers through a partnership between the two parties. Since it was crucial for banks to diversify their business models, the Reserve Bank of India, which regulates the banking system, approved their entry into the insurance sector. GRA (Gray Relational Analysis

show abstract

Section: Introductionmentioning

confidence: 99%

Assessment of Manufacturing Process Selection Utilizing the TOPSIS Method

2023

jbab

View full text Add to dashboard Cite

show abstract

“…Virtual casting analysis has gained increasing attention in the scientific community due to its advantages in terms of cost-effectiveness, shorter analysis time and reduced environmental impact compared to real casting tests. Several authors have contributed to this field by publishing studies employing numerical simulation to investigate fluid flow, solidification and defect formation in each stage of the casting process, including filling, injection and solidification [40][41][42][43][44][45]. These research efforts have played a significant role in advancing knowledge in this area and improving casting processes.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Gating System for Rapid Investment Casting of Shape Memory Alloys: Computational Numerical Analysis for Defect Minimization in a Simple-Cubic Cell Structure

Albuquerque

Silva

Grassi

et al. 2023

Metals

View full text Add to dashboard Cite

With the aid of virtual prototyping and casting numerical simulation, this work presents the optimization of an injection system used in a non-traditional investment casting process that applies perpendicular centrifugal force to inject the molten metal into refractory plaster molds. In this study, advanced techniques of simulation and production of complex geometries in Computer-Aided Design CAD (Computer-Aided Design) are used in the design of the casting system of a miniaturized simple-cubic cell structure. The cast part has a complex shape profile and needs a high surface finish with strict dimensional tolerance. The alloy used to fill the mold is an aluminum bronze shape memory alloy (SMA). CAD was used to model the part and the proposed models for casting optimization. ProCAST software was used for the numerical simulation of the casting process. Experimental parameters were used as input data for the numerical simulation. The simulation results were analyzed focusing on the identification of defects in the Cu–Al–Mn SMA simple-cubic structures. Different feeding systems have been designed to eliminate the identified defects. Concerning the molten recirculation, the optimal nozzle model has a truncated cone profile, with a larger radius of 6.5 mm, a smaller radius of 2.0 mm and a height of 8.0 mm (called here model 3). Experimental observations from cast SMA parts agree with the simulated results of the optimized nozzle model 3. In addition to the elimination of alloy recirculation with the nozzle optimization in this work, the shrinkage porosity at the upper base of the part was eliminated with the addition of a compensation volume close to the region where porosity is more intense. By exploring the possibilities offered by commercial software, the work contributes to advance the knowledge and application of the non-traditional investment casting process, highlighting its advantages and potential applications.

show abstract

“…However, maintaining a high bifilm concentration simply to lengthen grain refiner fading would be a faulty and highly uneconomical step. Most (if not all) advantages of grain refinement could be counterweighted by the presence of bifilms [ 40 ]: mechanical properties such as ultimate tensile strength, elongation to failure [ 41 , 42 , 43 , 44 , 45 , 46 , 47 ] and fatigue limit [ 48 , 49 , 50 ] could be lowered drastically; fluidity decreases [ 51 , 52 ] while the tendency to porosity and hot tear formation increases by an increment in bifilm content [ 53 , 54 , 55 ]. This clearly shows that a different approach is needed.…”

Section: Introductionmentioning

confidence: 99%

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

View full text Add to dashboard Cite

Grain refiner particles, which are intended to induce the formation of fine equiaxed grain structure during the solidification of aluminum alloys, are prone to settling during the holding of the liquid metal, which phenomenon can affect not only the grain size but the spatial distribution of the double oxide films in the melt. In this study, the settling of Al3Ti inoculant particles, as well as its effects on melt quality and grain refinement, were studied. During the experiments, the Ti-concentration of a liquid Al-Si-Mg-Cu alloy was increased to 0.3 wt.% by the addition of Al-10%Ti master alloy at different melt temperatures. Particle settling and grain size evolution were studied by quantitative metallography, while the interactions of grain refiners and bifilms were investigated by scanning electron microscopy (SEM). The evolution of melt quality was assessed by the computed tomographic (CT) analysis of reduced pressure test (RPT) samples. It was found that effective grain refinement was only realized when the introduced blocky Al3Ti particles were dissolved and re-precipitated in the form of (Al,Si)3Ti at a lower temperature. Without dissolving at higher holding temperatures, Al3Ti particle settling has taken place within 10 min. The settling of (Al,Si)3Ti particles improved melt quality by the aided sedimentation of bifilms in the melt.

show abstract

Experimental and numerical investigations of oxide-related defects in Al alloy gravity die castings

Cited by 9 publications

References 48 publications

Assessment of Manufacturing Process Selection Utilizing the TOPSIS Method

Assessment of Manufacturing Process Selection Utilizing the TOPSIS Method

Optimizing the Gating System for Rapid Investment Casting of Shape Memory Alloys: Computational Numerical Analysis for Defect Minimization in a Simple-Cubic Cell Structure

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Contact Info

Product

Resources

About