Elevated temperature impact on performance of Low Temperature Co‐fired Ceramic dielectrics

2019 ◽  
Vol 17 (2) ◽  
pp. 728-733
Author(s):  
Anton Polotai ◽  
Julie Voak ◽  
Jim Henry ◽  
David Thoss ◽  
Yi Yang ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Low Temperature ◽  
Temperature Impact ◽  
Ceramic Dielectrics

scholarly journals Experimental Study on Laser-MIG Hybrid Welding of Thick High-Mn Steel Plate for Cryogenic Tank Production

2021 ◽  
Vol 9 (6) ◽  
pp. 604
Author(s):  
Du-Song Kim ◽  
Hee-Keun Lee ◽  
Woo-Jae Seong ◽  
Kwang-Hyeon Lee ◽  
Hee-Seon Bang
Keyword(s):  
Low Temperature ◽  
Yield Strength ◽  
Steel Plate ◽  
Weld Zone ◽  
Base Material ◽  
Hardness Test ◽  
Steel Plates ◽  
Hybrid Welding ◽  
Temperature Impact ◽  
Mn Steel

The International Maritime Organization has recently updated the ship emission standards to reduce atmospheric contamination. One technique for reducing emissions involves using liquefied natural gas (LNG). The tanks used for the transport and storage of LNG must have very low thermal expansion and high cryogenic toughness. For excellent cryogenic properties, high-Mn steel with a complete austenitic structure is used to design these tanks. We aim to determine the optimum welding conditions for performing Laser-MIG (Metal Inert Gas) hybrid welding through the MIG leading and laser following processes. A welding speed of 100 cm/min was used for welding a 15 mm thick high-Mn steel plate. The welding performance was evaluated through mechanical property tests (tensile and yield strength, low-temperature impact, hardness) of the welded joints after performing the experiment. As a result, it was confirmed that the tensile strength was slightly less than 818.4 MPa, and the yield strength was 30% higher than base material. The low-temperature impact values were equal to or greater than 58 J at all locations in the weld zone. The hardness test confirmed that the hardness did not exceed 292 HV. The results of this study indicate that it is possible to use laser-MIG hybrid welding on thick high-Mn steel plates.

Influence of welding HAZ microstructure on low-temperature impact fracture behaviour in C–Mn shipbuilding steel

2021 ◽  
Vol 26 (4) ◽  
pp. 316-323
Author(s):  
Zuopeng Zhao ◽  
Xuteng Hu ◽  
Weidong Wen ◽  
Bin Wang
Keyword(s):  
Low Temperature ◽  
Fracture Behaviour ◽  
Impact Fracture ◽  
Shipbuilding Steel ◽  
Temperature Impact

Progress of Research on Welding for Molybdenum Alloys

2014 ◽  
Vol 33 (3) ◽  
pp. 193-200 ◽  
Author(s):  
Jiteng Wang ◽  
Juan Wang ◽  
Yajiang Li ◽  
Deshuang Zheng
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Low Temperature ◽  
Welded Joint ◽  
Structural Materials ◽  
Practical Applications ◽  
Traditional Technology ◽  
Molybdenum Alloys ◽  
Resistance To Oxidation ◽  
Temperature Applications

AbstractMolybdenum and molybdenum alloys are considered to be attractive structural materials for high-temperature applications. However, molybdenum alloys are sensitive to gas impurities and have the characteristics of low temperature embrittlement and less resistance to oxidation at elevated temperature. The toughness and strength of welded joint is not easy to be ensured by traditional technology. Recently, many efforts have been made to join molybdenum and its alloys. In this paper, we present the result of investigations on welding methods of molybdenum and its alloys and overview the practical applications in engineering. The key of joining molybdenum alloys is to improve the toughness of welded joint and prevent the generation of pores and cracks.

Mycorrhiza does not alter low temperature impact on Gnaphalium norvegicum

Oecologia ◽  
2004 ◽  
Vol 140 (2) ◽  
pp. 226-233 ◽  
Author(s):  
Anna Liisa Ruotsalainen ◽  
Minna-Maarit Kytöviita
Keyword(s):  
Low Temperature ◽  
Temperature Impact

scholarly journals Challenging the thorium-immobility paradigm

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Haylea Nisbet ◽  
Artas A. Migdisov ◽  
Anthony E. Williams-Jones ◽  
Hongwu Xu ◽  
Vincent J. van Hinsberg ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Low Temperature ◽  
Nuclear Fuel ◽  
Fuel Cycle ◽  
Nuclear Fuel Cycle ◽  
Hydrothermal Fluids ◽  
Solubility Data ◽  
Aqueous Systems ◽  
Hydrothermal Deposits ◽  
High Concentrations

AbstractThorium is the most abundant actinide in the Earth’s crust and has universally been considered one of the most immobile elements in natural aqueous systems. This view, however, is based almost exclusively on solubility data obtained at low temperature and their theoretical extrapolation to elevated temperature. The occurrence of hydrothermal deposits with high concentrations of Th challenges the Th immobility paradigm and strongly suggests that Th may be mobilized by some aqueous fluids. Here, we demonstrate experimentally that Th, indeed, is highly mobile at temperatures between 175 and 250 °C in sulfate-bearing aqueous fluids due to the formation of the highly stable Th(SO4)2 aqueous complex. The results of this study indicate that current models grossly underestimate the mobility of Th in hydrothermal fluids, and thus the behavior of Th in ore-forming systems and the nuclear fuel cycle needs to be re-evaluated.

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