CREEP BEHAVIOR AT HIGH TEMPERATURE OF HYBRID REBAR-GLULAM TIMBER BEAM UNDER LONG-TERM LOADING

Rapid solidification processing (RSP) is one method of producing high strength aluminum alloys for elevated temperature applications. Allied-Signal, Inc. has produced an Al-12.4 Fe-1.2 V-2.3 Si (composition in wt pct) alloy which possesses good microstructural stability up to 425°C. This alloy contains a high volume fraction (37 v/o) of fine nearly spherical, α-Al12(Fe, V)3Si dispersoids. The improved elevated temperature strength and stability of this alloy is due to the slower dispersoid coarsening rate of the silicide particles. Additionally, the high v/o of second phase particles should inhibit recrystallization and grain growth, and thus reduce any loss in strength due to long term, high temperature annealing.The focus of this research is to investigate microstructural changes induced by long term, high temperature static annealing heat-treatments. Annealing treatments for up to 1000 hours were carried out on this alloy at 500°C, 550°C and 600°C. Particle coarsening and/or recrystallization and grain growth would be accelerated in these temperature regimes.

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KUBOTA KNC-03

Alloy Digest ◽

10.31399/asm.ad.ni0676 ◽

2010 ◽

Vol 59 (1) ◽

Keyword(s):

Compressive Strength ◽

High Temperature ◽

Physical Properties ◽

Tensile Properties ◽

High Strength ◽

Temperature Performance ◽

Resistance To Oxidation

Abstract Kubota KNC-03 is a grade with a combination of high strength and excellent resistance to oxidation. These properties make this alloy suitable for long-term service at temperature up to 1250 deg C (2282 deg F). This datasheet provides information on physical properties, hardness, elasticity, tensile properties, and compressive strength as well as creep. It also includes information on high temperature performance as well as casting and joining. Filing Code: Ni-676. Producer or source: Kubota Metal Corporation, Fahramet Division. See also Alloy Digest Ni-662, April 2008.

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ATI 6-2-4-2

Alloy Digest ◽

10.31399/asm.ad.ti0169 ◽

2020 ◽

Vol 69 (8) ◽

Keyword(s):

Tensile Strength ◽

Titanium Alloy ◽

High Temperature ◽

Creep Strength ◽

High Strength ◽

Heat Treating ◽

Good Combination ◽

Long Term Stability ◽

Temperature Performance

Abstract ATI 6-2-4-2 is a near-alpha, high strength, titanium alloy that exhibits a good combination of tensile strength, creep strength, toughness, and long-term stability at temperatures up to 425 °C (800 °F). Silicon up to 0.1% frequently is added to improve the creep resistance of the alloy. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ti-169. Producer or Source: ATI.

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CO Detection Investigation at High Temperature by SiC MISFET Metal/Oxide Gas Sensors

Proceedings ◽

10.3390/proceedings2020056041 ◽

2021 ◽

Vol 56 (1) ◽

pp. 41

Author(s):

Lida Khajavizadeh ◽

Anita Lloyd Spetz ◽

Mike Andersson

Keyword(s):

High Temperature ◽

Gas Sensors ◽

Elevated Temperatures ◽

Long Term Stability ◽

Stability Performance ◽

Catalytic Metal ◽

Co Detection ◽

Effect Transistor ◽

Metal Oxide Gas Sensors

In order to investigate the necessary device improvements for high-temperature CO sensing with SiC metal insulator semiconductor field effect transistor (MISFET)-based chemical gas sensors, devices employing, as the gas-sensitive gate contact, a film of co-deposited Pt/Al2O3 instead of the commonly used catalytic metal-based contacts were fabricated and characterized for CO detection at elevated temperatures and different CO and O2 levels. It can be concluded that the sensing mechanism at elevated temperatures correlates with oxygen removal from the sensor surface rather than the surface CO coverage as observed at lower temperatures. The long-term stability performance was also shown to be improved compared to that of previously studied devices.

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In Situ Tests on Creep Behavior of Rock Mass with Joint or Shearing Zone in Foundation of Large-Scale Hydroelectric Projects

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.261-263.1097 ◽

2004 ◽

Vol 261-263 ◽

pp. 1097-1102 ◽

Cited By ~ 2

Author(s):

Jian Liu ◽

Xia Ting Feng ◽

Xiu Li Ding ◽

Huo Ming Zhou

Keyword(s):

Rock Mass ◽

Creep Behavior ◽

Large Scale ◽

Time Dependent ◽

Three Gorges Project ◽

Three Gorges ◽

The Three Gorges ◽

The Three Gorges Project

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

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Microstructural investigation on the failure in APMT/KHR45A dissimilar weld interface after long-term service at high temperature

Materials Characterization ◽

10.1016/j.matchar.2021.111110 ◽

2021 ◽

pp. 111110

Author(s):

Han-Jin Kim ◽

Jihye Park ◽

Young-Su Ji ◽

Byung Moon Jeong ◽

Jingak Nam ◽

...

Keyword(s):

High Temperature ◽

Weld Interface ◽

Microstructural Investigation ◽

Dissimilar Weld

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First Demonstration of High Temperature SiC CMOS Gate Driver in Bridge Leg for Hybrid Power Module Application

Materials Science Forum ◽

10.4028/www.scientific.net/msf.924.854 ◽

2018 ◽

Vol 924 ◽

pp. 854-857

Author(s):

Ming Hung Weng ◽

Muhammad I. Idris ◽

S. Wright ◽

David T. Clark ◽

R.A.R. Young ◽

...

Keyword(s):

High Temperature ◽

Integrated Circuits ◽

Initial Increase ◽

Reliability Test ◽

Power Devices ◽

Power Module ◽

Hybrid Power ◽

Gate Driver ◽

Passive Circuit

A high-temperature silicon carbide power module using CMOS gate drive technology and discrete power devices is presented. The power module was aged at 200V and 300 °C for 3,000 hours in a long-term reliability test. After the initial increase, the variation in the rise time of the module is 27% (49.63ns@1,000h compared to 63.1ns@3,000h), whilst the fall time increases by 54.3% (62.92ns@1,000h compared to 97.1ns@3,000h). The unique assembly enables the integrated circuits of CMOS logic with passive circuit elements capable of operation at temperatures of 300°C and beyond.

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