Influences of heat treatments on the strength properties of amorphous SiC fibers

2019 ◽  
Vol 28 (5) ◽  
pp. 491-506 ◽  
Author(s):  
Shingo Kanazawa ◽  
Naoki Yamazaki ◽  
Tomonori Kishi ◽  
Keiji Kubushiro
Keyword(s):  
Strength Properties ◽  
Heat Treatments ◽  
Sic Fibers ◽  
Amorphous Sic

Three Point Bend Performance of Solutionized, Die Quenched and Heat Treated AA7075 Beam Members

2014 ◽  
Vol 794-796 ◽  
pp. 431-436 ◽  
Author(s):  
Alexander Bardelcik ◽  
Alexandre Bouhier ◽  
Michael J. Worswick
Keyword(s):  
Mechanical Properties ◽  
Peak Load ◽  
Natural Aging ◽  
High Strength ◽  
Total Elongation ◽  
Strength Properties ◽  
Heat Treatments ◽  
Forming Process ◽  
Heat Treated ◽  
Point Bend

To overcome the low room temperature formability of AA7075-T6 aluminum sheet, without sacrificing the high strength properties of this alloy, a hat section beam member was formed and quenched within a cold die immediately after a 20 minute solutionizing treatment. Natural aging for 24 hours followed the forming process which was then followed by various heat treatments that included a typical precipitation hardening (PH) and industrial paint bake (PB) temperature-time treatment. Tensile specimens were extracted from the beams to evaluate their mechanical properties. When compared to the as-received AA7075-T6 mechanical properties, the beams heat treated with the PH, PHPB and PB treatment resulted in a 5%, 13% and 20% reduction in ultimate tensile strength respectively. A similar trend was shown for the yield strength measurements. There was little effect of the heat treatments on the total elongation, with the PH condition showing a slight improvement. A backing plate was riveted to the beams and a quasi-static 3 point bend test was conducted to evaluate the crush performance. The peak load for the PH, PHPB and PB beams was 9.2, 8.5 and 7.3 kN respectively, but the calculated energy-displacement (or energy absorption) curves were similar for the PH and PHPB parts due to a more ductile fracture behavior for the PHPB material condition.

The synthesis of TiAl intermetallic films by a rf magnetron sputtering and the mechanical properties of the microcomposites with SiC fibers

1994 ◽  
Vol 9 (4) ◽  
pp. 1028-1034 ◽  
Author(s):  
Takakazu Suzuki ◽  
Hiroyuki Umehara ◽  
Ryuichi Hayashi
Keyword(s):  
Magnetron Sputtering ◽  
Titanium Aluminide ◽  
Rf Magnetron Sputtering ◽  
Strength Properties ◽  
Matrix Composites ◽  
Sic Fibers ◽  
Sic Fiber ◽  
Intermetallic Matrix ◽  
Intermetallic Matrix Composites ◽  
Increasing Temperature

The intermetallic matrix composites reinforced with heat-resistive fibers are expected to improve the ductility and the toughness of intermetallic compounds. Titanium aluminide, TiAl, shows a unique behavior that increases the mechanical strength with increasing temperature up to 1000 K. Vapor phase processings for manufacturing near-net-shaped composites or continuous fiber-reinforced composites will be hopeful methods. The synthesis of TiAl by a magnetron sputtering using a multiple target has been successfully established, and the microcomposites with SiC fibers have been prepared. The TiAl film was evaluated by Auger electron spectroscopy and the x-ray analysis and so on. The tensile strength properties of the SiC/TiAl microcomposites, of which the interface bonding was controlled with the powers of sputtering, were estimated. The results show that the strength properties of SiC/TiAl microcomposites are decreasing with increasing the power of the sputtering, and the irradiation-cured SiC fiber has better compatibility with TiAl than the oxidation-cured SiC fiber.

Laser Assisted Cutting of Abrasion Resistant Steel

2012 ◽  
Vol 504-506 ◽  
pp. 1371-1376 ◽  
Author(s):  
Jani Kantola ◽  
Kari Mäntyjärvi ◽  
Jussi A. Karjalainen
Keyword(s):  
Heat Treatment ◽  
High Hardness ◽  
Strength Properties ◽  
Heat Treatments ◽  
Relative Depth ◽  
Laser Heat Treatment ◽  
Resistant Steel ◽  
Shearing Force ◽  
Laser Milling ◽  
Laser Heat

Abrasion resistant (AR) steels offer excellent hardness and strength properties in applications as mining and earth moving machines. As an outcome of high hardness AR steels can be used to produce durable, light-weight and energy saving products. However, their mechanical processing can be challenging as the hardness of the material approaches the hardness of the tooling used. This places high forces on cutting tools and machines, which, in turn, increases wear and causes early breakdown. This research examines whether the laser treatment of AR steels can be used to aid guillotine shearing. The tested material was abrasion resistant steel with hardness of 400 HBW. Two different laser treatments were examined: local laser heat treatment and laser milling. The aim of laser heat treatment was to change the original martensitic microstructure locally into weaker structure, beneficially for shearing. Narrow grooves were made along the cut line by laser milling, and then the plate cut along them. The effect of local laser heat treatment and the fracture initiating effect of the groove was evaluated from the cutting force. Microhardness tests and micro photos were taken after laser heat treatments. The results indicated that the shearing force of AR steels can be reduced up to 25% with the aid of laser heat treatments. Laser milling had only a slight effect to the shearing force of up to about 8%. In addition, the relative depth of the laser milled groove is estimated at the same range, thus force reduction is mainly due to reduction of material thickness.

Vapor Phase Synthesis of Ti Aluminides and the Interfacial Bonding Effect on the Mechanical Property of Micro-Composites Reinforced by Pyrolized SiC Fibers

1994 ◽  
Vol 350 ◽  
Author(s):  
T. Suzuki ◽  
H. Umehara ◽  
R. Hayashi
Keyword(s):  
Vapor Phase ◽  
Strength Properties ◽  
Reinforced Composites ◽  
Interface Bonding ◽  
Phase Synthesis ◽  
Sic Fibers ◽  
Sic Fiber ◽  
Sputtering Power ◽  
Bonding Effect ◽  
Vapor Phase Synthesis

AbstractVapor phase processings for manufacturing near-net-shaped composites, continuous fiber reinforced composites or lamellar composite will be hopeful methods. The method for synthesis of TiAl by a magnetron sputtering using a multiple target has been successfully established, and the tensile property of the microcomposite with SiC fibers has been studied. The TiAl produced by a vapor phase processing was evaluated by Auger electron spectroscopy and the x-ray analysis. The tensile strength properties of the SiC/TiAl microcompositesof which the interface bonding was controlled with the powers of sputtering were estimated. The properties of SiC/TiAl microcomposites are decreasing with increasing the sputtering power. The irradiation-cured SiC fiber has better compatibility with TiAl than the oxidation-cured SiC fiber. The strength of the microcomposite has been improved with using a thin C-coated irradiation-cured SiC fiber.

scholarly journals Effect of Impurities Control on the Crystallization and Densification of Polymer-Derived SiC Fibers

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2933
Author(s):  
Young-jun Joo ◽  
Sang-hyun Joo ◽  
Hyuk-jun Lee ◽  
Young-jin Shim ◽  
Dong-geun Shin ◽  
...  
Keyword(s):  
Impurity Content ◽  
Fiber Surface ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Sic Fibers ◽  
Decomposition Reactions ◽  
Blending Method ◽  
Effect Of Impurities ◽  
Curing Method ◽  
Amorphous Sic

The polymer-derived SiC fibers are mainly used as reinforcing materials for ceramic matrix composites (CMCs) because of their excellent mechanical properties at high temperature. However, decomposition reactions such as release of SiO and CO gases and the formation of pores proceed above 1400 °C because of impurities introduced during the curing process. In this study, polycrystalline SiC fibers were fabricated by applying iodine-curing method and using controlled pyrolysis conditions to investigate crystallization and densification behavior. Oxygen and iodine impurities in amorphous SiC fibers were reduced without pores by diffusion and release to the fiber surface depending on the pyrolysis time. In addition, the reduction of the impurity content had a positive effect on the densification and crystallization of polymer-derived SiC fibers without a sintering aid above the sintering temperature. Consequently, dense Si-Al-C-O polycrystalline fibers containing β-SiC crystal grains of 50~100 nm were easily fabricated through the blending method and controlled pyrolysis conditions.

Effect of high temperature heat treatment on the microstructure and mechanical properties of third generation SiC fibers

2013 ◽  
Vol 1514 ◽  
pp. 131-137
Author(s):  
Dominique Gosset ◽  
Aurélien Jankowiak ◽  
Thierry Vandenberghe ◽  
Maud Maxel ◽  
Christian Colin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Anisotropy Parameter ◽  
Tensile Tests ◽  
Heat Treatments ◽  
Neutral Atmosphere ◽  
X Ray Diffraction ◽  
Sic Fibers ◽  
High Temperature Heat Treatment ◽  
Temperature Heat ◽  
Temperature Heat Treatment

ABSTRACTSiC fibers (High Nicalon S -HNS and Tyranno SA3 -Ty-SA3) submitted to heat treatments in neutral atmosphere up to 1900°C were studied by X-ray diffraction (XRD) and TEM observations then submitted to tensile tests up to 1800°C. The microstructural changes in both materials were determined by XRD using a modified Hall-Williamson method introducing an anisotropy parameter taking into account the high density of planar defects of the SiC-3C structure. HNS fibers exhibit significant modifications in the CDD size which drastically increases from 24 nm to 70 nm in the range 1600°C to 1800°C and in the microstrains which decrease from 0.0015 to 0.0005 between 1750°C to 1850°C. Concerning the Ty-SA3 fibers, no evolution of CDD size and microstrains has been observed. The mechanical properties of single fibers were investigated after the heat treatments showing decreases in the tensile strength reaching up to 20% for Tyranno SA3 and 50% for High Nicalon S. The Weibull moduli were also significantly affected. These results are correlated to the fiber structural and microstructural evolutions.

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