Hydro Casthouse Reference Centre

2009 ◽  
Vol 630 ◽  
pp. 9-16
Author(s):  
Trond Furu ◽  
Idar Kjetil Steen
Keyword(s):  
State Of The Art ◽  
Casting Machine ◽  
Casting Process ◽  
Pilot Scale ◽  
Hot Tearing ◽  
Ceramic Foam ◽  
Practical Training ◽  
Emergency Situations ◽  
Reference Centre ◽  
Melt Treatment

Since October 2006 the Hydro Casthouse Reference Centre has been operating. The centre is a full scale state of the art pilot casting centre for extrusion ingot, sheet ingot and foundry alloys, consisting of a 17Mtons furnace with a metal loop, a launder system including modular in-line melt treatment units such as ceramic foam filters (CFF) and inline melt refining units (Hycast SIR) and a casting pit with the possibility to cast full size geometries and a casting length of 5.5m. A two strand horizontal casting machine further adds the possibility of continuous casting of extrusion ingot and foundry alloy ingot. The centre has a state of the art superior control system (SCS) and a lay-out, including control room facilities, well suited for training and demonstration purposes. In addition the centre has access to state of the art software codes for simulating the casting process (Alsim) and the as cast microstructure (Alstruc). The present paper gives some examples on how the centre is operating and the support that is offered to casthouses in Hydro. This includes (i) simulation of the casting processes (hot tearing and as cast structures) applying the Alsim and Alstruc codes, (ii) pilot scale testing of casting and melt treatment equipment, (iii) testing of new parameters and procedures for melt treatment and casting (iv) production of trial orders of new alloys and (v) practical training of casthouse operators (basic for molten metal handling, emergency situations and response, casting principles and trouble shooting, etc.).

Study on high-temperature wear and mechanism of Al-Si/graphite composites prepared by the die-casting process

2020 ◽  
Vol 72 (10) ◽  
pp. 1153-1158 ◽  
Author(s):  
Yafei Deng ◽  
Xiaotao Pan ◽  
Guoxun Zeng ◽  
Jie Liu ◽  
Sinong Xiao ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Peer Review ◽  
Die Casting ◽  
Casting Machine ◽  
Injection Pressure ◽  
Casting Process ◽  
Matrix Alloy ◽  
Content Type ◽  
The Matrix

Purpose This paper aims to improve the tribological properties of aluminum alloys and reduce their wear rate. Design/methodology/approach Carbon is placed in the model at room temperature, pour 680°C of molten aluminum into the pressure chamber, and then pressed it into the mold containing carbon felt through a die casting machine, and waited for it to cool, which used an injection pressure of 52.8 MPa and held the same pressure for 15 s. Findings The result indicated that the mechanical properties of matrix and composite are similar, and the compressive strength of the composite is only 95% of the matrix alloy. However, the composite showed a low friction coefficient, the friction coefficient of Gr/Al composite is only 0.15, which just is two-third than that of the matrix alloy. Similarly, the wear rate of the composite is less than 4% of the matrix. In addition, the composite can avoid severe wear before 200°C, but the matrix alloy only 100°C. Originality/value This material has excellent friction properties and is able to maintain this excellent performance at high temperatures. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0454/

Research on causes of hot-tearing of AA3003 aluminum billet during DC casting process

2021 ◽  
Vol 95 ◽  
pp. 29-37
Author(s):  
Bach Dao Hong ◽  
◽  
Trung Trinh Van
Keyword(s):  
Chemical Composition ◽  
Casting Process ◽  
Direct Chill ◽  
Hot Tearing ◽  
Cast Aluminum ◽  
Allowable Limit ◽  
Chemical Composition Distribution ◽  
Electron Microscopes ◽  
Scanning Electron Microscopes ◽  
Direct Chill Casting Process

AA3003 aluminum alloy made from raw scrap materials that have the advantage of economical use, but hottearing often occurs in the product billets of the direct chill casting process. This study used ANOVA analysis method for determination of chemical composition of AA3003 aluminum billet products to show influence of chemical composition on hot-tearing ability. The evaluation of the microstructure and chemical composition distribution of the elements by optical and scanning electron microscopes combined with energy dispersive spectroscopy showed the existence of impurities such as Cu, Zn, Fe, Pb exceeding the allowable limit in aluminum billets, especially at grain boundary, which can be the main reason for the hot-tearing of cast aluminum billets.

scholarly journals The Influences of Grain Refiner, Inclusion Level, and Filter Grade on the Filtration Performance of Aluminum Melt

2021 ◽  
Author(s):  
Jiawei Yang ◽  
Sarina Bao ◽  
Shahid Akhtar ◽  
Ulf Tundal ◽  
Stig Tjøtta ◽  
...  
Keyword(s):  
Oxide Films ◽  
Pilot Scale ◽  
Ceramic Foam ◽  
Grain Refiner ◽  
Filtration Process ◽  
Aluminum Melt ◽  
Filtration Performance ◽  
Master Alloys ◽  
Inclusion Level ◽  
High Level

AbstractThe addition of grain refiner particles in the aluminum melt is known to reduce the filtration efficiency of ceramic foam filter (CFF). In the present work, a systematic study on the influence of the addition level of Al-Ti-B master alloys and the inclusion level on the filtration performance of aluminum melt has been investigated by pilot-scale filtration tests using 50 PPi and 80 PPi filters. The inclusion level of the melt has been measured using both LiMCA and PoDFA. For 80 PPi CFF, the N20 inclusion (diameter larger than 20 μm) value in the post-filtrated melt does not increase when an ultra-high level of inclusions is introduced in the form of chips. For the melts with a low level of grain refiners (~ 0.5 kg/ton), the filtration performance of CFF is not affected by grain refiners, regardless of inclusion load. An addition of 2.0 kg/ton grain refiners reduces the filtration performance for melts with a high inclusion level, where post-filtration inclusions with the size of 15-20 µm were significantly increased. It is found, however, for the melts with an ultra-high inclusion load, the filtration performance of 80 PPi CFF is not affected by the grain refiner addition up to 2.0 kg/ton. The interactions between inclusions and grain refiner particles and the filtration mechanism have been studied by characterizing the spent filter and measuring the pressure drop during the filtration process. It is revealed that the strong adherence between oxide film with grain refiner particles dominates the grain refiner influence on the filtration performance of CFF. During the filtration process, oxide films have strong influences on the capturing of other inclusions such as oxide particles and TiB2 particles by the filter. A mechanism based on the interactions between oxide films and grain refiner particles is proposed to explain the CFF performance under the influence of grain refiner.

A Preliminary Study of Fabrication Technology for Dynamic Compression Plates Using Centrifugal Casting Process

2021 ◽  
Vol 18 (2) ◽  
Author(s):  
A.K. Nasution ◽  
D. Gustiani ◽  
A. Handoko ◽  
Mukhtar ◽  
Zulkarnain ◽  
...  
Keyword(s):  
Low Income ◽  
Dynamic Compression ◽  
Centrifugal Casting ◽  
Casting Machine ◽  
Casting Process ◽  
Low Income Countries ◽  
Silicon Alloy ◽  
Horizontal Type ◽  
Preliminary Study ◽  
Cast Pipe

The high cost of health services in low-income countries has caused them to produce implants and medical devices at low cost. This research highlights a preliminary study of the design concept, mould design, and fabrication of horizontal type centrifugal casting machines for the manufacture of dynamic compression plates materials. Normally, dynamic compression plate is produced from materials such as 316L stainless steel, cobalt, and titanium alloys. In this work, aluminium-silicon alloy was used in this preliminary study. Aluminium-silicon alloy was melted at a temperature of 730 °C and poured into a mould with a rotational speed of 1500 rpm. Tensile, hardness and microstructure investigation were carried out to discern the mechanical properties of the cast product from the horizontal type centrifugal casting machine. Results showed the measured value of tensile strength is not significantly different in the two zones of cast pipe, the butt zone of fall of molten metal (specimen A) was 147 MPa, and the butt-end zone (specimen B) was 142 MPa. The hardness value for the as-cast pipe obtained from the outside, middle, and inside, was 104.0, 92.9, and 80.3 HV, respectively. Evaluation of microporosity in fractures (from tensile test) results from horizontal type centrifugal castings showed a small distribution. Meanwhile, the calculation of the contour hole processing time for DCP with eight holes is 38 minutes per implant.

Technology for modeling and integrated assessment of regional security indicators

2020 ◽  
pp. 127-139
Author(s):  
А.В. Маслобоев
Keyword(s):  
State Of The Art ◽  
Arctic Region ◽  
Regional Security ◽  
Economic Systems ◽  
Problem Statement ◽  
Probabilistic Estimation ◽  
Emergency Situations ◽  
Management Scenario ◽  
Integral Estimation ◽  
Security Indicators

Для задач синтеза сценариев управления региональной безопасностью в условиях кризисных ситуаций разработана технология интегральной оценки безопасности региональных социально-экономических систем. Предложена формализованная постановка задачи и ее декомпозиция с учетом набора ключевых показателей безопасности. В отличие от известных формальных моделей устойчивого развития технология обеспечивает формирование матричного интегрального показателя региональной безопасности и позволяет оценить состояние и тенденции развития региона за счет совместного использования системно-динамических, нечетких и вероятностных моделей оценки индикаторов безопасности. С применением разработанной технологии построена матрица региональной безопасности Арктической зоны РФ. For management scenario synthesis of regional security under emergency situations problem-solving a technology for security integral estimation of the regional socio-economic systems has been developed. The formalized problem statement and it decomposition subject to the set of key security indicators have been proposed. In contrast to well-known and state-of-the-art formal models of sustainable development the technology provides matrix integral index formation of regional security and allows situation and tendencies assessment of regional development at the expense of joint use of system-dynamic, fuzzy and probabilistic estimation models of security indicators. With application of developed technology the regional security matrix of Arctic region of Russian Federation has been designed.

A narrative review: The electromagnetic field arrangement and the “braking” effect of electromagnetic brake (EMBr) technique in slab continuous casting

2021 ◽  
Vol 118 (2) ◽  
pp. 218
Author(s):  
Zhuang Li ◽  
Lintao Zhang ◽  
Danzhu Ma ◽  
Nicholas P. Lavery ◽  
Engang Wang
Keyword(s):  
Continuous Casting ◽  
State Of The Art ◽  
Casting Process ◽  
Continuous Casting Process ◽  
Electromagnetic Brake ◽  
Slab Continuous Casting ◽  
Advantages And Disadvantages ◽  
Local Type ◽  
High Casting Speed ◽  
Multi Mode

Electromagnetic brake (EMBr) technique is adopted to reduce the turbulence of molten alloy in the slab mould in the continuous casting process, especially under high casting speed. We introduce a state-of-the-art EMBr technique by reviewing the published literature. The main objective of this paper is to give a clear view of the EMBr technique in terms of the magnet arrangement, along with their “Braking” effect to help decision-making. The EMBr system can be divided into three types, in terms of the magnet arrangement: the Local type, the Ruler type and the Multi-mode type, respectively. Both advantages and disadvantages of each type have been discussed. Further challenges are also raised.

scholarly journals CO2 Capture, Use, and Storage in the Cement Industry: State of the Art and Expectations

Energies ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 5692 ◽  
Author(s):  
Marta G. Plaza ◽  
Sergio Martínez ◽  
Fernando Rubiera
Keyword(s):  
Co2 Capture ◽  
Carbon Capture ◽  
State Of The Art ◽  
Pilot Scale ◽  
Cement Industry ◽  
General Overview ◽  
Climate Targets ◽  
Commercial Scale ◽  
And Storage ◽  
Made In

The implementation of carbon capture, use, and storage in the cement industry is a necessity, not an option, if the climate targets are to be met. Although no capture technology has reached commercial scale demonstration in the cement sector yet, much progress has been made in the last decade. This work intends to provide a general overview of the CO2 capture technologies that have been evaluated so far in the cement industry at the pilot scale, and also about the current plans for future commercial demonstration.

scholarly journals PARABORN: A Training Program for “Outdoor” Activities by Pregnant Urgent Patients for Paramedics

2019 ◽  
Vol 34 (s1) ◽  
pp. s155-s155
Author(s):  
Vaclav Jordan
Keyword(s):  
Obstetric Care ◽  
Hospital Environment ◽  
Premature Delivery ◽  
Practical Training ◽  
Emergency Situations ◽  
Standard Position ◽  
Cultural Conditions ◽  
Educational Concept ◽  
Newborn Child ◽  
Professional Assistance

Introduction:Spontaneous delivery is a completely physiological phenomenon. Occupational obstetric care in a hospital environment focuses on supporting the mother, the smooth progression of the baby, and the treatment of the newborn child. Occupational activities play a rather supportive and assisting role. The obstetrician and the midwife are ready to respond immediately in the hospital environment to any complications or sudden emergencies. During a birth outside of the hospital environment, there are a number of influences that can cause complications in an unprepared environment without professional assistance, endangering the condition of both the child and the woman.Methods:The educational concept of PARABORN focuses on situations outside the hospital environment. It is generalized and adaptable to varying geographic, economic, and cultural-political conditions of the target providers, particularly to rescue and paramedic teams. Educational concepts are specialized, interactive courses. The course includes a theoretical and practical block. In the theoretical part, the participants acquire knowledge of urgent obstetric conditions in an out-of-hospital environment including an overweight birth, bleeding, premature delivery, or a complicated delivery (non-standard position, umbilical cord prolapse, etc.). In the practical block, participants acquire the skills of acute interventions as well as methods of communication in these emergency situations. Practical training takes the form of case studies and can be tailored to the real geographic and cultural conditions in which the intervention units operate such as remote terrain, conflicts zones, etc.Discussion:The knowledge of the cultural and political environment is a necessary prerequisite for managing the urgent situation. Paramedics, as first responders, should have adequate training to manage maternity situations in an out-of-hospital environment where a hospital environment is not available or accessible either by choice or circumstance.

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