Effect of Heating Rate on Al Bonding in Air by Inserted A5056 Disk

2007 ◽  
Vol 345-346 ◽  
pp. 1457-1460 ◽  
Author(s):  
Hiroshi Kawakami ◽  
Keiko Kimura ◽  
Satoshi Kondo ◽  
Jippei Suzuki
Keyword(s):  
Mechanical Properties ◽  
Oxide Film ◽  
Heating Rate ◽  
Thermal History ◽  
Bonding Process ◽  
High Heating Rate ◽  
High Heating ◽  
History Of ◽  
Al Oxide ◽  
Bonding Surface

Al bonding in air by inserted A5056 was investigated in this study. Heating rate in thermal history of bonding process may have the relation with the growth of Al oxide film and the deformation of bonding surface by softening. Both of phenomena affect the joinability and the mechanical properties of bond. Al bonding in air was carried out by several heating rate. Growth of Al oxide film significantly suppressed the progress of bonding in air by low heating rate, 1K/s. Decrease of deformation of bonding surface suppressed also the progress of bonding by high heating rate, 10K/s. In case of medium heating rate, 5K/s, good joinabilty of Al bonding in air was obtained by the medium growth of oxide film and the deformation of bonding surface.

scholarly journals Effect of the Heating Rate on the Spark-Plasma-Sintering (SPS) of Transparent Y2O3 Ceramics: Microstructural Evolution, Mechanical and Optical Properties

Ceramics ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 56-69
Author(s):  
Lihong Liu ◽  
Koji Morita ◽  
Tohru S. Suzuki ◽  
Byung-Nam Kim
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Heating Rate ◽  
Spark Plasma Sintering ◽  
Near Infrared ◽  
Slow Heating ◽  
High Heating Rate ◽  
Plasma Sintering ◽  
High Heating ◽  
Spark Plasma

High strength transparent Y2O3 ceramics were fabricated from commercial powders using spark plasma sintering (SPS) technique by optimizing the heating rate. The heating rate significantly influenced the microstructures and the optical/mechanical properties of the Y2O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2O3 ceramics, which were sintered by SPS with 100 °C/min, showed good transmittance range from visible to near infrared (IR). For a high heating rate of 100 °C/min, the in-line transmittance at a visible wavelength of 700 nm was 66%, whereas for a slow heating rate of 10 °C/min, it reduced to 46%. The hardness Hv tends to increase with increasing the heating rate and rigorously followed the Hall–Petch relationship; that is, it is enhanced with a reduction of the grain size. The toughness KIC, on the other hand, is less sensitive to both the heating rate and the grain size, and takes a similar value. This research highlighted that the high heating rate SPS processing can fabricate fully dense fine-grained Y2O3 ceramics with the excellent optical and mechanical properties.

Comparing fast inductive tempering and conventional tempering: Effects on microstructure and mechanical properties

2018 ◽  
Vol 115 (4) ◽  
pp. 407 ◽  
Author(s):  
Annika Eggbauer Vieweg ◽  
Gerald Ressel ◽  
Peter Raninger ◽  
Petri Prevedel ◽  
Stefan Marsoner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Charpy Impact ◽  
Heat Treating ◽  
Processing Route ◽  
High Heating Rate ◽  
Heating Rates ◽  
High Heating ◽  
Tempering Treatment ◽  
Carbide Distribution

Induction heating processes are of rising interest within the heat treating industry. Using inductive tempering, a lot of production time can be saved compared to a conventional tempering treatment. However, it is not completely understood how fast inductive processes influence the quenched and tempered microstructure and the corresponding mechanical properties. The aim of this work is to highlight differences between inductive and conventional tempering processes and to suggest a possible processing route which results in optimized microstructures, as well as desirable mechanical properties. Therefore, the present work evaluates the influencing factors of high heating rates to tempering temperatures on the microstructure as well as hardness and Charpy impact energy. To this end, after quenching a 50CrMo4 steel three different induction tempering processes are carried out and the resulting properties are subsequently compared to a conventional tempering process. The results indicate that notch impact energy raises with increasing heating rates to tempering when realizing the same hardness of the samples. The positive effect of high heating rate on toughness is traced back to smaller carbide sizes, as well as smaller carbide spacing and more uniform carbide distribution over the sample.

Investigations on High Heating Rate and Precision Calibration of the Thermoelectric Characteristics of the Tool and Work Materials

CIRP Annals ◽  
1983 ◽  
Vol 32 (1) ◽  
pp. 47-51 ◽  
Author(s):  
H.J. Xu ◽  
X.C. Tong ◽  
X.S. Zhao ◽  
Y.Z. Zhang ◽  
J. Peklenik
Keyword(s):  
Heating Rate ◽  
High Heating Rate ◽  
High Heating

Metal oxide nanoparticles formed from solution droplets under high heating rate

2012 ◽  
Vol 43 ◽  
pp. 23-31 ◽  
Author(s):  
Francesco Carbone ◽  
Alberto C. Barone ◽  
Federico Beretta ◽  
Andrea D’Anna
Keyword(s):  
Metal Oxide ◽  
Heating Rate ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
High Heating Rate ◽  
High Heating

scholarly journals High heating rate sintering and microstructural evolution assessment using the discrete element method

Open Ceramics ◽  
2021 ◽  
Vol 8 ◽  
pp. 100182
Author(s):  
Mirele Horsth Paiva Teixeira ◽  
Vasyl Skorych ◽  
Rolf Janssen ◽  
Sergio Yesid Gómez González ◽  
Agenor De Noni Jr ◽  
...  
Keyword(s):  
Discrete Element Method ◽  
Heating Rate ◽  
Microstructural Evolution ◽  
Discrete Element ◽  
High Heating Rate ◽  
High Heating ◽  
Element Method

scholarly journals Gasification of High Heating-rate Biomass-derived Chars at Elevated Temperatures

2017 ◽  
Vol 105 ◽  
pp. 642-647
Author(s):  
Tian Li ◽  
Yanqing Niu ◽  
Liang Wang ◽  
Terese Løvås
Keyword(s):  
Heating Rate ◽  
Elevated Temperatures ◽  
High Heating Rate ◽  
High Heating

scholarly journals XPS and Electron Microscopy Study of Oxide-Scale Evolution on Ignition Resistant Mg-3Ca Alloy at Low and High Heating Rates

2020 ◽  
Vol 1 ◽  
Author(s):  
L. A. Villegas-Armenta ◽  
R. A. L. Drew ◽  
M. O. Pekguleryuz
Keyword(s):  
Oxide Scale ◽  
Heating Rate ◽  
Photoelectron Spectroscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
High Heating Rate ◽  
Heating Rates ◽  
Oxide Interface ◽  
Protective Oxide ◽  
High Heating

AbstractEarlier work by the authors suggested that the formation of molten eutectic regions in Mg-Ca binary alloys caused a discrepancy in ignition temperature when different heating rates are used. This effect was observed for alloys where Ca content is greater than 1 wt%. In this work, the effect of two heating rates (25 °C/min and 45 °C/min) on the ignition resistance of Mg-3Ca is evaluated in terms of oxide growth using X-ray Photoelectron Spectroscopy. It is found that the molten eutectic regions develop a thin oxide scale of ~100 nm rich in Ca at either heating rate. The results prove that under the high heating rate, solid intermetallics are oxidized forming CaO nodules at the metal/oxide interface that eventually contribute to the formation of a thick and non-protective oxide scale in the liquid state.

scholarly journals Effects of Heating Rate on Formation of Globular and Acicular Austenite during Reversion from Martensite

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 266 ◽  
Author(s):  
Xianguang Zhang ◽  
Goro Miyamoto ◽  
Yuki Toji ◽  
Tadashi Furuhara
Keyword(s):  
Heating Rate ◽  
High Temperatures ◽  
The Other ◽  
Growth Mode ◽  
High Heating Rate ◽  
Heating Rates ◽  
Other Hand ◽  
High Heating ◽  
Martensite Matrix

The effects of heating rate on the formation of acicular and globular austenite during reversion from martensite in Fe–2Mn–1.5Si–0.3C alloy have been investigated. It was found that a low heating rate enhanced the formation of acicular austenite, while a high heating rate favored the formation of globular austenite. The growth of acicular γ was accompanied by the partitioning of Mn and Si, while the growth of globular γ was partitionless. DICTRA simulation revealed that there was a transition in growth mode from partitioning to partitionless for the globular austenite with an increase in temperature at high heating rate. High heating rates promoted a reversion that occurred at high temperatures, which made the partitionless growth of globular austenite occur more easily. On the other hand, the severer Mn enrichment into austenite at low heating rate caused Mn depletion in the martensite matrix, which decelerated the reversion kinetics in the later stage and suppressed the formation of globular austenite.

Microstructural evolution of nanocrystalline Al2O3 sintered at a high heating rate

2010 ◽  
Vol 36 (2) ◽  
pp. 555-559 ◽  
Author(s):  
Fancheng Meng ◽  
Zhengyi Fu ◽  
Weimin Wang ◽  
Qingjie Zhang
Keyword(s):  
Heating Rate ◽  
Microstructural Evolution ◽  
High Heating Rate ◽  
High Heating

Coal Swelling Model for High Heating Rate Pyrolysis Applications

2011 ◽  
Vol 25 (5) ◽  
pp. 2163-2173 ◽  
Author(s):  
Randy C. Shurtz ◽  
Kolbein K. Kolste ◽  
Thomas H. Fletcher
Keyword(s):  
Heating Rate ◽  
High Heating Rate ◽  
Coal Swelling ◽  
High Heating ◽  
Swelling Model
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