Semiautomatic welding of 15Kh5M steel in a carbon dioxide atmosphere without heat treatment of the weld joints

1992 ◽  
Vol 28 (9) ◽  
pp. 569-573
Author(s):  
A. G. Khalimov ◽  
N. M. Korolev ◽  
A. F. Tishkin ◽  
I. K. Kutluev
Keyword(s):  
Carbon Dioxide ◽  
Heat Treatment ◽  
Weld Joints ◽  
Carbon Dioxide Atmosphere ◽  
Semiautomatic Welding

Calcite Bone Substitute Prepared from Calcium Hydroxide Compact Using Heat-Treatment under Carbon Dioxide Atmosphere

2011 ◽  
Vol 493-494 ◽  
pp. 166-169 ◽  
Author(s):  
Kanji Tsuru ◽  
Akihiro Otsu ◽  
Michito Maruta ◽  
Alireza Valanezhad ◽  
Giichiro Kawachi ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Heat Treatment ◽  
Calcium Hydroxide ◽  
Heating Temperature ◽  
High Mechanical Property ◽  
X Ray ◽  
Carbon Dioxide Atmosphere ◽  
Short Period ◽  
Diametral Tensile Strength ◽  
Intergranular Space

The purpose of this study is to investigate whether calcite blocks with high mechanical property could be obtained for a short period from calcium hydroxide (Ca(OH)2) compact using heat-treatment under carbon dioxide (CO2) atmosphere. The Ca(OH)2 disks compacted with different pressure was heated at different temperature ranging from 200°C to 800°C for an hour under CO2 atmosphere. From the X-ray diffractometry, Ca(OH)2 converted into calcite along with the rise of the heating temperature. Small amount of unreacted Ca(OH)2 remained in samples heated at 600°C whereas samples treated at 800°C converted to calcite with very small amount of calcium oxide. The diametral tensile strength (DTS) value increased with the rise of heating temperature up to 600°C then decreased down to 800°C. Meanwhile, the porosity decreased with the rise of heating temperature up to 600°C then slightly increased up to 800°C. From the scanning electron microscope observation, grains grew bigger along with the rise of heating temperature. Intergranular space between grains decreased from 200°C to 600°C. The highest DTS value (14 MPa±1.3) at 600°C could be the result of lesser intergranular space due to sintering.

scholarly journals Influence of Post Weld Heat Treatment on the Grain Size, and Mechanical Properties of the Alloy-800H Rotary Friction Weld Joints

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4366
Author(s):  
Saqib Anwar ◽  
Ateekh Ur Rehman ◽  
Yusuf Usmani ◽  
Ali M. Al-Samhan
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Grain Size ◽  
Heat Affected Zone ◽  
Tensile Testing ◽  
Weld Zone ◽  
Alloy 800H ◽  
Weld Joints ◽  
Heat Treated ◽  
Friction Weld

This study evaluated the microstructure, grain size, and mechanical properties of the alloy 800H rotary friction welds in as-welded and post-weld heat-treated conditions. The standards for the alloy 800H not only specify the composition and mechanical properties but also the minimum grain sizes. This is because these alloys are mostly used in creep resisting applications. The dynamic recrystallization of the highly strained and plasticized material during friction welding resulted in the fine grain structure (20 ± 2 µm) in the weld zone. However, a small increase in grain size was observed in the heat-affected zone of the weldment with a slight decrease in hardness compared to the base metal. Post-weld solution heat treatment (PWHT) of the friction weld joints increased the grain size (42 ± 4 µm) in the weld zone. Both as-welded and post-weld solution heat-treated friction weld joints failed in the heat-affected zone during the room temperature tensile testing and showed a lower yield strength and ultimate tensile strength than the base metal. A fracture analysis of the failed tensile samples revealed ductile fracture features. However, in high-temperature tensile testing, post-weld solution heat-treated joints exhibited superior elongation and strength compared to the as-welded joints due to the increase in the grain size of the weld metal. It was demonstrated in this study that the minimum grain size requirement of the alloy 800H friction weld joints could be successfully met by PWHT with improved strength and elongation, especially at high temperatures.

Thermodynamic Studies of Iron Carbonate Solubility in Aqueous Monoethylene Glycol Mixtures and CO2 Atmosphere

2016 ◽  
Vol 830 ◽  
pp. 134-138 ◽  
Author(s):  
Camila Senna Figueiredo ◽  
Jailton Ferreira do Nascimento ◽  
Rony Oliveira de Sant'ana ◽  
Deborah Cordeiro de Andrade ◽  
Zaniel Souto Dantas Procópio ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
High Capacity ◽  
Gas Production ◽  
Aqueous Mixtures ◽  
Iron Carbonate ◽  
Low Viscosity ◽  
Carbon Dioxide Atmosphere ◽  
Equilibrium Data ◽  
Monoethylene Glycol

Monoethylene glycol (MEG) is being widely applied as thermodynamic inhibitor to avoid formation of natural gas hydrates. High hydrophilicity, low toxicity, low viscosity, low solubility in liquid hydrocarbons and high capacity of dissolving salts are advantageous for the use of MEG in the natural gas production. In addition, MEG recovery can be easily achieved considering its low volatility in relation to water, which makes the process economical and environmentally feasible. The reuse of MEG is being theme of research and phase equilibrium data for the involved species are required. In this work, a experimental procedure to synthetize iron carbonate and, afterwards, determine its solubility in aqueous mixtures of MEG in the presence of carbon dioxide atmosphere have been developed. Furthermore, a series of solubility data has been measured. This work presents a worthy contribution to the description of iron carbonate aqueous solubilities in the presence of MEG and carbon dioxide, regarding the instability of the salt to respect of oxidation. Subsequently, the knowledge of the behavior of the iron carbonate solubilities is useful for the industrial unities of production of natural gas and recovery of MEG.

Impact strength of the metal of weld joints made with powder wire in carbon dioxide

1979 ◽  
Vol 15 (7) ◽  
pp. 533-534
Author(s):  
N. T. Lositskii ◽  
S. N. Berezhnitskii ◽  
V. K. Krasil'nikov ◽  
Zh. E. Milyaeva
Keyword(s):  
Carbon Dioxide ◽  
Impact Strength ◽  
Powder Wire ◽  
Weld Joints

Influence of heat treatment on the tensile and hardness characteristics of friction stir weld joints of dissimilar aluminium alloys

2022 ◽  
Author(s):  
K. Ramesha ◽  
P. D. Sudersanan ◽  
Prem Kumar Mahto ◽  
Shaikh Mohammed Ismail ◽  
Ashwin C. Gowda ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloys ◽  
Friction Stir Weld ◽  
Friction Stir ◽  
Weld Joints

scholarly journals Heat treatment mode optimization of dissimilar weld joints of EP517 steel to 36NKhTYu alloy

2020 ◽  
Vol 759 ◽  
pp. 012024
Author(s):  
E V Terentyev ◽  
A Yu Marchenkov ◽  
A L Goncharov ◽  
A P Sliva ◽  
K T Borodavkina
Keyword(s):  
Heat Treatment ◽  
Treatment Mode ◽  
Dissimilar Weld ◽  
Weld Joints ◽  
Heat Treatment Mode ◽  
36Nkhtyu Alloy
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