Effect of Heat Treatment Process on the Preparation of Foamed Glass Ceramic from Red Mud and Fly Ash

2014 ◽  
Vol 670-671 ◽  
pp. 201-204 ◽  
Author(s):  
Yu Xi Guo ◽  
Yi He Zhang ◽  
Hong Wei Huang ◽  
Pan Hu
Keyword(s):  
Heat Treatment ◽  
Fly Ash ◽  
Glass Ceramic ◽  
Red Mud ◽  
Treatment Process ◽  
Sintering Temperature ◽  
Holding Time ◽  
Heat Treatment Process ◽  
Ceramic Foams

Lightweight glass ceramic foams have been prepared from a mixture of solid wastes, namely 40 wt-% red mud and 60 wt-% fly ash. In this work, we illustrate the effects of variables in heat treatment process, including the sintering temperature and the holding time, on the quality of the foams. The reduction of sintering temperature as well as the holding time, was found to limit the coalescence and improve the apparent density and the compressive strength.

scholarly journals The Influence of Holding Time on the Microstructure Evolution of Mg–10Zn–6.8Gd–4Y Alloy during Semi-Solid Isothermal Heat Treatment

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 420 ◽  
Author(s):  
Shuang Nie ◽  
Bingyang Gao ◽  
Xuejian Wang ◽  
Zhiqiang Cao ◽  
Enyu Guo ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Grain Boundaries ◽  
Microstructure Evolution ◽  
Treatment Process ◽  
Ostwald Ripening ◽  
Eutectic Structure ◽  
Holding Time ◽  
Isothermal Heat Treatment ◽  
Heat Treatment Process ◽  
Semi Solid

A semi-solid microstructure of Mg–10Zn–6.8Gd–4Y alloys is acquired via an isothermal heat treatment process, and the effects of the holding time on the microstructure evolution of Mg–10Zn–6.8Gd–4Y alloys are investigated. The results show that the microstructure of the cast alloy is composed of primary α-Mg dendritic grains with a eutectic structure (W-phase and eutectic Mg) distributed at the grain boundaries. The primary α-Mg dendritic grains grow in size with increasing holding time, and they tend to grow into more globular structures in the initial stage; they then become a bit more dendritic, as small branches grow from the grain boundaries after holding the sample at 580 °C for 10 min. Meanwhile, the interdiffusion of magnesium atoms within the eutectic region, and between the primary α-Mg and eutectic structure, leads to the formation of fine and relatively globular eutectic Mg grains in the eutectic structure after holding for 10 min. The eutectic Mg grains begin to grow, coarsen, coalesce, or be swallowed by the surrounding primary grains, causing fluctuations of the general grain size. Over the whole isothermal heat treatment process, two mechanisms—coalescence and Ostwald ripening—dominate the grain coarsening.

Surface Modification of 2205 Duplex Stainless Steel by Low Temperature Thermochemical Hybrid Heat Treatment at 450° C

2013 ◽  
Vol 845 ◽  
pp. 408-411
Author(s):  
M.S. Adenan ◽  
M.N. Berhan ◽  
E. Haruman
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Low Temperature ◽  
Duplex Stainless Steel ◽  
Treatment Process ◽  
Surface Hardness ◽  
Horizontal Tube ◽  
Holding Time ◽  
Hardness Profile ◽  
Heat Treatment Process

An approach has been made in developing hybrid heat treatment process for improvement of surface properties of duplex stainless steel (DSS). The process was performed using horizontal tube furnace at temperature of 450° C at holding time of 4, 8, 16 and 30 hours. Carbon and nitrogen elements were simultaneously introduced onto the surface of DSS with a ratio of 5% CH4 + 25% NH3 + 70% N2. The microstructure, phase analysis, surface hardness and hardness profile were systematically assessed. Hybrid heat treatment process managed to produce diffusional layer, where longer holding time had increased the thickness of the layer and improved the surface hardness. Expanded austenite phase has been formed at specimens 8, 16 and 30 hours. Longer holding time however gradually diffused Cr2N at the ferrite grains at the substrates. From the process, it can be concluded that low temperature hybrid heat treatment be able to improve the surface hardness of DSS however concern on holding time must be highly considered.

scholarly journals Effect of Holding Time and Cooling Media on Heat Treatment Process to Gear Motor Indopart Hardness

2021 ◽  
Vol 1125 (1) ◽  
pp. 012116
Author(s):  
Klemens A. Rahangmetan ◽  
Cipto ◽  
Christian W. Wullur ◽  
D Parenden ◽  
Farid Sariman
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Holding Time ◽  
Heat Treatment Process ◽  
Cooling Media

scholarly journals Pengaruh jarak nozzle penyemprot terhadap kemampukerasan baja komersil dengan metode jominy test

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Yusuf Yusuf ◽  
Asep Ruchiyat ◽  
Muh Anhar
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Process ◽  
Test Method ◽  
Holding Time ◽  
Heat Treatment Process ◽  
Wear And Tear ◽  
Jominy Test ◽  
Specimen Number

Steel is the material most widely used in the industry. To avoid wear and tear on steel, it is necessary to do heat treatment to improve the mechanical properties of the steel according to its application in the field. The increase in hardenability in metals can be determined by doing a hardenability test, namely the Jominy test method. The Jominy test is a method to determine the hardness value of metal using ASTM standards. This research was conducted with varying the distance of the nozzle of the sprayer to the lower end of the specimen, namely 10 mm, 12.5 mm, and 14 mm with a long spraying time of 15 minutes. The heat treatment process at temperature of 780oC and 90 minutes holding time. The averagehardness value of specimen number one (10 mm spraying distance) is 45.43 kgf, specimen number two (12.5 mm spraying distance) is 45.68 kgf, and specimen number three (14 mm spraying distance) is 44.31 kgf. The highest hardness value was specimen number two, there was an increase of 1.87 kgf (4.02%), according to ASTM standards where the spraying distance was 12.5 mm.Keywords: Steel, spraying distance, Jominy test.

Flexible perovskite solar cells fabricated by a gradient heat treatment process

2020 ◽  
Vol 4 (2) ◽  
pp. 824-831 ◽  
Author(s):  
Yue Yue Xiao ◽  
Yongqiang Meng ◽  
Hongli Gao ◽  
Yichuan Chen ◽  
Qi Meng ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solar Cells ◽  
Treatment Process ◽  
Perovskite Solar Cells ◽  
Heat Treatment Process

A gradient heat treatment process can effectively improve the quality of perovskite films and the efficiency of flexible perovskite solar cells.

Effect of Heat Treatment on Microstructures and Mechanical Properties of A356 Alloy by Low Pressure Casting

2015 ◽  
Vol 1096 ◽  
pp. 319-324
Author(s):  
Xiao Jian Yu ◽  
Ya Lin Lu ◽  
Fu Xian Zhu ◽  
Xing Cheng Li
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Treatment Process ◽  
A356 Alloy ◽  
Low Pressure ◽  
Holding Time ◽  
Pressure Casting ◽  
Heat Treatment Process ◽  
Low Pressure Casting ◽  
Microstructures And Mechanical Properties

Automobile wheel of A356 alloy was cast by low pressure casting process. The effect of heat treatment process on microstructures and mechanical properties of A356 alloy cast was discussed. The results indicated that optimal parameters of heat treatment process for A356 alloy included solution temperature of 535°Cand holding time of 4.5hours, aging temperature of 145°Cand holding time of 4hours. Ultimate strength of A356 is 270MPa and elongation rate is 10%. Meanwhile, the microstructure has been apparently improved. The eutectic silicon particle became more spheroidal and distributed uniformly in matrix.

scholarly journals Application of DCOR-QFD model for improving the process performance and quality of the product

2018 ◽  
Vol 7 (1.9) ◽  
pp. 64
Author(s):  
T S. SivadasAniyan ◽  
V R. Pramod
Keyword(s):  
Heat Treatment ◽  
Business Process ◽  
Treatment Process ◽  
Machining Process ◽  
Product Development Process ◽  
Heat Treatment Process ◽  
Process Performance ◽  
Business Process Performance

In this case study, DCOR - QFD model has been experimented as a product development process in the forging industry to assess the business process performance of the company, improving the heat treatment process and machining process. The present business process performance characteristics values were calculated using DCOR-1 model. The revised processes for improving the heat treatment process and machining process were identified. In this research, the performance of the integrated DCOR-QFD model was not evaluated in this research. The business process performance of the company using DCOR-1 model and the revised processes for improving the present processes were identified using QFD were calculated separately.

scholarly journals Manufacture of Toothed Elements in Nanoausferritic Ductile Iron

2014 ◽  
Vol 59 (3) ◽  
pp. 1217-1221 ◽  
Author(s):  
D. Myszka ◽  
E. Skołek ◽  
A. Wieczorek
Keyword(s):  
Heat Treatment ◽  
Ductile Iron ◽  
Treatment Process ◽  
Induction Hardening ◽  
Heat Treatment Process ◽  
Hardening Process ◽  
Long Time ◽  
New Material ◽  
Quality Of Products

Abstract The technology currently used for the fabrication of toothed wheels, gear couplings and chain drums involves the induction hardening process or hardening and tempering after carburising. All these processes take a long time and cause adverse changes in the dimensions and surface quality of products, requiring post-treatment machining to remove the resulting cavities. The paper proposes the implementation of gear elements made of ductile iron with nanoausferritic matrix obtained by a new appropriate heat treatment process. The new material offers good performance characteristics and nearly no need for the application of other technological processes commonly used in the manufacture of gears.

Study on Normalizing Process for 100mm E40 Heavy Plate

2013 ◽  
Vol 765-767 ◽  
pp. 197-201
Author(s):  
Xiang Yu Xu ◽  
Xue Min Wang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Treatment Process ◽  
High Strength ◽  
Holding Time ◽  
Heat Treatment Process ◽  
Heavy Plate ◽  
Hull Steel ◽  
Normalization Process

The influence of chemical composition, heat treatment process and microstructure on the properties of E40 heavy plate have been studied. After normalization process of thick TMCP plate for high strength hull steel, the structure is substantially more regular, but the strength decreases. The former microstructure consists of lath-like bainite, but after heat treatment it consists of ferrite and pearlite. The mechanical properties meet the requirement of GB 712 prescript. With cooling rate decreasing, grain size in normalizing samples increases gradually, and the strength decreases. With the holding time extending, grain growth is not obvious, and the strength decreases. The best normalizing temperature is 910 °C, and the best holding time is about100 min.

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