The primary-auxiliary local post-welding heat treatment method to control welding residual stresses for pressure vessels

2021 ◽  
pp. 104431
Author(s):  
Qiang Jin ◽  
Wenchun Jiang ◽  
Wenbin Gu ◽  
Jinguang Wang ◽  
Gang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Treatment Method ◽  
Pressure Vessels ◽  
Heat Treatment Method

A Study of the Influence of Local Heat Treatment on the Structure of Welded Titanium Pipelines

2021 ◽  
Vol 410 ◽  
pp. 37-41
Author(s):  
Natalia A. Astafeva ◽  
Andrey A. Balanovskiy ◽  
Anna A. Pershina
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Titanium Alloys ◽  
Welded Joints ◽  
Treatment Method ◽  
Local Heat ◽  
Optical Metallography ◽  
Heat Treated ◽  
Weld Structure ◽  
Heat Treatment Method

The article analyzes the results of a study of the influence of zonal heat treatment on the structure of welded joints of pipeline elements made of titanium alloys Ti-3.5Al-1.5Mn. In the manufacture of such structures, the TIG welding method is used to join pipe elements, after which the heat treatment method can be used to relieve residual stresses. The experiments have confirmed the effectiveness of zonal heat treatment preceded by welding. It was revealed that for welded joints made of titanium alloys, heat treatment can stabilize the structure. In experiments conducted by the method of optical metallography, the structure of heat treated and untreated welded joints was investigated. The influence of heat treatment on the weld structure and heat-affected zone was identified.

Modified-edge-support heat treatment method of polyimide for crystalline, large-area, and self-standing ultrathin graphite films

Carbon ◽  
2021 ◽  
Author(s):  
Kensuke Murashima ◽  
Yuki Kawashima ◽  
Shuhei Ozaki ◽  
Atsushi Tatami ◽  
Masamitsu Tachibana ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Method ◽  
Large Area ◽  
Heat Treatment Method

Preparation of aluminum nitride granules by a two-step heat treatment method

2018 ◽  
Vol 29 (4) ◽  
pp. 849-854 ◽  
Author(s):  
Kuan-Ting Lai ◽  
Cheng-Hung Shih ◽  
Chun-Te Wu ◽  
Min-Yu Yang ◽  
Chi-Shiung Hsi
Keyword(s):  
Heat Treatment ◽  
Aluminum Nitride ◽  
Treatment Method ◽  
Step Heat Treatment ◽  
Heat Treatment Method

scholarly journals Improving the Inner Surface State of Thick-Walled Tubes by Heat Treatments with Internal Quenching Considering a Simulation Based Optimization

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1303
Author(s):  
Fabian Mühl ◽  
Moritz Klug ◽  
Stefan Dietrich ◽  
Volker Schulze
Keyword(s):  
Heat Treatment ◽  
Residual Stresses ◽  
Surface State ◽  
Treatment Process ◽  
Treatment Method ◽  
Fe Model ◽  
Heat Treatment Process ◽  
Residual Stress State ◽  
Optimization Study ◽  
Inner Surface

Internal Quenching is an innovative heat treatment method for difficult to access component sections. Especially, the microstructure, as well as the residual stress state at inner surfaces, of thick-walled tubes can be adjusted with the presented flexible heat treatment process. Based on multiphysical FE-models of two different steels, a simulative optimization study, considering different internal quenching strategies, was performed in order to find the optimal cooling conditions. The focus hereby was on the adjustment of a martensitic inner surface with high compressive residual stresses. The simulatively determined optimal cooling strategies were carried out experimentally and analyzed. A good agreement of the resulting hardness and residual stresses was achieved, validating the presented Fe-model of the Internal Quenching process. The shown results also indicate that the arising inner surface state is very sensitive to the transformation behavior of the used steel. Furthermore, the presented study shows that a preliminary simulative consideration of the heat treatment process helps to evaluate significant effects, reducing the experimental effort and time.

A supercapacitor with ultrahigh volumetric capacitance produced by self-assembly of reduced graphene oxide through phosphoric acid treatment

2020 ◽  
Vol 8 (36) ◽  
pp. 18933-18944 ◽  
Author(s):  
Zhaoyuan Liu ◽  
Lidong Wang ◽  
Guizhi Ma ◽  
Yinan Yuan ◽  
Henan Jia ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Graphene Oxide ◽  
Phosphoric Acid ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Acid Treatment ◽  
Treatment Method ◽  
Reduced Graphene ◽  
Volumetric Capacitance ◽  
Heat Treatment Method

Self-assembled reduced graphene oxide was prepared by a phosphoric acid heat-treatment method and exhibited an ultra-high volumetric capacitance.

VO2: from negative electrode material to symmetric electrochemical capacitor

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97239-97247 ◽  
Author(s):  
Xue-Jing Ma ◽  
Wei-Bin Zhang ◽  
Ling-Bin Kong ◽  
Yong-Chun Luo ◽  
Long Kang
Keyword(s):  
Heat Treatment ◽  
Electrode Material ◽  
Negative Electrode ◽  
Electrochemical Capacitor ◽  
Treatment Method ◽  
Heat Treatment Method ◽  
Negative Electrode Material

A novel negative electrode material of 3D irregular ellipsoidal VO2 with excellent pseudocapacitive properties is synthesized via a simple heat treatment method.

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