Searched for: subject%3A%22solidification%22
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Liang, X. (author)
Advanced high strength steels (AHSS) have been widely employed in the automotive industry to meet the requirements of improving crash performance while reducing vehicle weight. The excellent performance of AHSS in strength and ductility comes from a dedicated design of alloy composition and microstructure. However, the addition of some alloying...
doctoral thesis 2024
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Akbar Ahmadi, Ali (author), Hooman, K. (author), Rahbari, Alireza (author)
Automatic icemakers are integrated into refrigerators to ensure a consistent ice supply and improve energy efficiency. Despite these advantages, a thorough investigation of the automatic icemaking process in domestic refrigerator-freezers is lacking in the literature. This study aims at assessing the performance of automatic icemaking process...
journal article 2024
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Lingmont, Roald (author)
In order to scale the planar flow casting (PFC) process to industrial levels a Python model is created. The model which is based on a combination of empirical and theoretical equations, is used to explore the limits of the process. The model is independently verified with a Comsol simulation, which is extended with solidification and heat...
master thesis 2023
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Selvakumar, Ravishankaran (author)
A multi-material structure combines diverse materials, allowing for precise tailoring of properties in specific regions. The integration of dissimilar materials leads to superior performance compared to single-material components. Bimetallic structures, a subset of multi-material systems, offer site-specific performance owing to the contrasting...
master thesis 2023
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Li, Erlei (author), Shen, Haopeng (author), Wang, L. (author), Wang, Geoff (author), Zhou, Zongyan (author)
The shape variation of the laser beam is evidently observed in the laser powder bed fusion (LPBF) process because of changes in laser incidence angle and misalignment between the build plate and the laser focus plane. This issue is particularly relevant in large-scale LPBF systems where the laser beam needs to scan a large build area. However...
journal article 2023
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Nedumaran, Muthamil Selvan (author), Gnanasekaran, Nagarajan (author), Hooman, K. (author)
The present study compares a modified variable height fin heat sink with the conventional constant height fin heat sink. The two heat sinks are filled with an equal volume of PCM (n-eicosane) and a fin volume fraction of 8 %. The experiments are performed for constant loads and also different power surge conditions. The pulsed heat loads are...
journal article 2023
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Sood, A. (author)
Third-generation advanced high strength steels (AHSS) are a new class of steels that offer superior functional properties and significant weight savings in the body-in-white (BIW) structure of a car. Weight savings directly translate to reduced CO<sub>2</sub> emissions from cars which aids automotive manufactures to meet the vehicle emission...
master thesis 2020
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Agarwal, G. (author)
Preventing solidification cracking is an essential prerequisite for the safety of a welded structure. An undetected solidification crack has the potential to cause premature failure during service. Two conditions generated by a weld thermal cycle are responsible for the initiation of solidification cracks. The first is the presence of excessive...
doctoral thesis 2019
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Kirov, Nikolay (author)
Surprisingly, liquid media of dispersed dry micron-sized particles can generate tremendous impact resistance, can grow solid protrusions when acoustically-vibrated and can cause a range of other peculiar phenomena to objects sinking in their interior, even though their appearance essentially remains ’liquid-like’. These heterogeneous mixtures of...
master thesis 2019
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Ebrahimi, Amin (author), Kleijn, C.R. (author), Richardson, I.M. (author)
The high degree of uncertainty and conflicting literature data on the value of the permeability coefficient (also known as the mushy zone constant), which aims to dampen fluid velocities in the mushy zone and suppress them in solid regions, is a critical drawback when using the fixed-grid enthalpy-porosity technique for modelling non-isothermal...
journal article 2019
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Agarwal, G. (author), Kumar, A. (author), Richardson, I.M. (author), Hermans, M.J.M. (author)
Solidification cracking susceptibility during laser welding was studied experimentally and numerically in advanced high strength steel sheets, namely transformation-induced plasticity (TRIP) and dual phase (DP) steel. Using the same heat input, laser bead-on-plate welding was carried out on single sided clamped specimens at various starting...
journal article 2019
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Eftekharimilani, P. (author), Gao, H. (author), Huizenga, R.M. (author), van der Aa, EM (author), Amirthalingam, M. (author), Richardson, I.M. (author), Hermans, M.J.M. (author)
Advanced high strength steels (AHSS) are increasingly used in automotive industry; thousands of resistance spot welds are applied to car body-in-white. High alloying levels of AHSS result in lower weldability. Residual stresses play an essential role on the formation of defects and the mechanical performance of the weld. An electrical-thermal...
conference paper 2018
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Agarwal, G. (author), Gao, H. (author), Amirthalingam, M. (author), Richardson, I.M. (author), Hermans, M.J.M. (author)
Advanced high-strength steels (AHSS), which are increasingly used in the automotive industry, meet many functional requirements such as high strength and crash resistance. Some of these steels contain high amounts of alloying elements, which are required to achieve the necessary mechanical properties, but render these steels susceptible to weld...
conference paper 2018
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Agarwal, G. (author), Amirthalingam, M. (author), Moon, S. C. (author), Dippenaar, R. J. (author), Richardson, I.M. (author), Hermans, M.J.M. (author)
Sufficient liquid feeding under constrained solidification conditions like, those experienced in welding and casting, is vital to avoid solidification cracking. We present the results of unique in-situ experimental observations of liquid feeding in a solidifying steel melt pool. Liquid feeding was observed in the inter-cellular regions during...
journal article 2018
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Agarwal, G. (author), Gao, H. (author), Amirthalingam, M. (author), Hermans, M.J.M. (author)
Susceptibility to weld solidification cracking in transformation-induced plasticity steel sheets was studied using a modified standard hot cracking test used in the automotive industry. To vary the amount of self-restraint, bead-on-plate laser welding was carried out on a single-sided clamped specimen at increasing distances from the free...
journal article 2018
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Agnani, Milan (author)
Wire and Arc based Additive Manufacturing (WAAM) processes are novel technologies that are seen as promising candidates for fabricating complex 3-Dimensional large scale components. These processes offer avenues to locally tailor metallurgy of the melt pool and thus produce functionally and compositionally graded components for improved...
master thesis 2017
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Kidess, A. (author)
doctoral thesis 2016
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Sosro Subroto, T.A. (author)
Direct-chill (DC) casting is one of the most common methods to produce ingots of high-strength aluminum alloys such as an AA7050. Despite of its superior mechanical properties, this alloy is prone to both hot tearing (HT) and cold cracking (CC) during DC casting. HT form above the solidus while CC occurs below the solidus temperature. CC...
doctoral thesis 2014
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Santillana, M.B. (author)
Nowadays a vast majority of the steel produced worldwide is via the continuous casting process route because this is the most low-cost, efficient and high quality method to mass produce metal products in a variety of sizes and shapes. Most of the continuous casters are the initial manufacturing step of a product which is very close to the final...
doctoral thesis 2013
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Zhang, L. (author)
The research in ultrasonic processing for metallurgical application shows a promising influence on improving casting properties of aluminium alloys. The principle of ultrasonic processing is introduction of acoustic waves with a frequency higher than 17 kHz into liquid metal. Several promising beneficial effects caused by ultrasonic processing...
doctoral thesis 2013
Searched for: subject%3A%22solidification%22
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