Tensile Strength of Carbon–Carbon Composites: II – Effect of Heat Treatment Temperature

2004 ◽  
Vol 38 (19) ◽  
pp. 1685-1699 ◽  
Author(s):  
Hiroshi Hatta ◽  
Tatsuji Aoi ◽  
Itaru Kawahara ◽  
Yasuo Kogo
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Carbon Composites

The effect of heat treatment temperature on the mechanical properties of copper M1.

2015 ◽  
Vol 2015 (3) ◽  
pp. 94-97
Author(s):  
Юлия Гусева ◽  
Yuliya Guseva ◽  
Владимир Сакало ◽  
Vladimir Sakalo ◽  
Татьяна Иншакова ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Heat Treatment Temperature ◽  
Tensile Tests ◽  
Treatment Temperature ◽  
Condi Tions ◽  
Solid Copper

Tensile tests of specimens made from solid copper M1 had been conducted. Samples were subjected to heat treatment by heating to temperatures of 200 to 900°C and were cooled in water or air. Values of tensile strength and relative residual elongation were defined. The condi-tions under which solid copper acquires the properties of soft copper installed.

scholarly journals Research on the influence of heat treatment temperature on bearing capacity of high steel grade pipeline during in-service welding

2021 ◽  
Vol 353 ◽  
pp. 01020
Author(s):  
Yan Xu ◽  
Yinglai Liu ◽  
Xianghui Nie ◽  
Zhenjun Feng ◽  
Liang Li ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
High Temperature ◽  
Yield Strength ◽  
Bearing Capacity ◽  
Tensile Properties ◽  
Heat Treatment Temperature ◽  
Heating Temperature ◽  
Treatment Temperature ◽  
Steel Grade

During the welding of in-service pipeline, natural gas is continuously transported in the pipeline, which maintains a high gas pressure. Therefore, the welding process is completed under strong cooling conditions, and welding delay crack is easy to occur. Preheating before welding and heat treatment after welding can effectively control the hardened microstructure, reduce the residual stress and ensure the welding quality. In this study, the influence of heating temperature on the bearing capacity of high steel grade pipe during in-service welding repair was studied. The high temperature tensile test was used to simulate the bearing capacity of the pipe under heating and high temperature environment. It is found that when the heating temperature is below 400°C, the pipe strength remains at the original level. With the increase of heating temperature, when the test temperature is higher than 400°C, the yield strength and tensile strength of the pipe decrease significantly. When the test temperature is 450°C, the yield strength and tensile strength of the material decrease by 15.8% and 11.1%, respectively, compared with the normal temperature, which are lower than the pipe standard requirements. Therefore, it is suggested that when the heat treatment temperature is higher than 400°C during in-service welding repair, it is necessary to consider reducing the pipeline pressure. At the same time, the box furnace heat treatment method was adopted to heat treat the pipe, and the tensile properties of the pipe after heat treatment were tested to analyze the bearing capacity of the pipe after heat treatment. It is found that when the heating temperature is higher than 700°C, the tensile properties of high grade pipeline steel pipe decrease sharply. It is suggested that when the heat treatment temperature is higher than 700°C, the risk assessment of the service safety of the heat treated pipeline should be carried out.

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