scholarly journals The Influence of Heat Treatment on the Thermal Expansion Coefficient and Carbides of Steel for Turbine Shafts. (Studies on the Reversible Deflection of Turbine Shaft, 1st Report)

1961 ◽  
Vol 25 (2) ◽  
pp. 131-135
Author(s):  
Akira Tokuda
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Turbine Shaft

Effects of Heat-Treatment Temperature on the Properties of Negative CTE Eucryptite Ceramics

2010 ◽  
Vol 105-106 ◽  
pp. 123-125 ◽  
Author(s):  
Yong Li ◽  
Qi Hong Wei ◽  
Ling Li ◽  
Chong Hai Wang ◽  
Xiao Li Zhang ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Heat Treatment Temperature ◽  
Bending Strength ◽  
Sol Gel ◽  
Negative Thermal Expansion ◽  
Treatment Temperature ◽  
Heat Treated

In this paper, negative thermal expansion coefficient eucryptite powders were prepared by sol-gel method using silica-sol as starting material. The raw blocks were obtained by dry pressing process after the powder was synthesized, and then the raw blocks were heat-treated at 600º, 1150º, 1280º, 1380º, 1420º and 1450°C, respectively. Variations of density, porosity and thermal expansion coefficient at different heat treatment temperatures were investigated. Phase transformation and fracture surface morphology of eucryptite heat-treated at different temperatures, respectively, were observed by XRD and SEM. The results indicate that, with the increasing heat- treatment temperature, the grain size and the bending strength increased, porosity decreased, thermal expansion coefficient decreased continuously. Negative thermal expansion coefficient of -5.3162×10-6~-7.4413×10-6 (0~800°C) was obtained. But when the heat-treatment temperature was more than 1420°C, porosity began to increase, bending strength began to decrease, which were the symbols of over-burning, while the main crystal phase didn’t change.

Effect of Heat Treatment on the Thermal Expansion Coefficient of Austempered Ductile Iron

2005 ◽  
Vol 475-479 ◽  
pp. 203-212
Author(s):  
M.Tadayon Saidi ◽  
N. Baghersaie ◽  
N. Varahram
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Ductile Iron ◽  
Automotive Application ◽  
Austempered Ductile Iron ◽  
Steel Microstructure ◽  
Design Flexibility ◽  
Cast Steels

Austempered ductile iron provide a unique combination of strength and toughness coupled with excellent design flexibility for automotive application as compared to forged or cast steels. Some material properties such as thermal expansion coefficient and its influence in final machining tolerance is a matter of discussion in the automotive industry. In this study the effect of heat treatment cycle on the microstructure & thermal expansion of ADI was investigated. Samples were austempered at 275 º C and 375 º C for one hour and then dilatometric test carried out in the temperature range of 50 °C to 350 °C, then the result was compared with the thermal expansion coefficient of forged steel. Microstructure and mechanical investigations were used to the assurance of these results. The results indicate that replacing of forged steel with ADI due to lower cost production and reduction in weight is possible if the correct tolerance were selected.

Crystallization and Thermal Expansion of MgO-Al2O3-SiO2-TiO2 Glass-Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 1635-1638
Author(s):  
Hua Shao ◽  
Kai Ming Liang ◽  
Feng Zhou ◽  
Fei Peng
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Phase Separation ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Treatment Condition ◽  
Glass Ceramics ◽  
Heat Treatment Condition ◽  
Crystallization Sequence ◽  
The Relationship

Crystallization sequence of MgO-Al2O3-SiO2-TiO2 system glass was investigated by means of DTA, XRD, SEM and EDS. The relationship between crystalline phases, heat treatment methods and thermal expansion coefficient (α) were well discussed. The results have shown that: The glass first underwent extensive phase separation into titanium-rich droplets in a silica-rich matrix, then magnesium aluminotitanate (MAT) initially precipitated in the droplet phases. With the crystallization temperature increased, β-quartzss, sapphirine, α-quartzss and α-cordierite made their appearance successively. The thermal expansion coefficient as a function of the heat treatment condition was studied.

Numerical Simulation of Welding Residual Stress and Post-Weld Heat Treatment for Dissimilar Steel Welded Joint

2008 ◽  
Vol 575-578 ◽  
pp. 747-752 ◽  
Author(s):  
Guo Dong Zhang ◽  
Chang Yu Zhou
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Thermal Expansion ◽  
Thermal Expansion Coefficient ◽  
Base Metal ◽  
Expansion Coefficient ◽  
Welded Joint ◽  
Welding Residual Stress ◽  
Dissimilar Steel ◽  
Welding Line

By the finite element analysis software ABAQUS and the function of coupling process between heat and stress, the welding residual stress of Cr5Mo and 20 steel joint was analyzed. In addition the heat treatment of dissimilar steel welded joint was simulated. The residual stress distributions of dissimilar steel welding and heat treatment after welding were obtained. The comparison of welding residual stress between the homogenous steel and dissimilar steel was carried out. The results indicate that the welding residual stress of the same steel is lower than that of dissimilar steel welded joint obviously. Because of the difference of thermal expansion coefficient for base metal and welding microstructure, the relatively higher residual stress is produced due to the bigger thermal expansion coefficient of base metal. The highest annular residual stress is in welding line root of internal wall, while the highest axial residual stress is in welding line surface of outer wall. The welding residual stress of dissimilar welded joint is reduced obviously after heat treatment. The research results provide the possibility for optimizing the welding procedure and improving the reliability of dissimilar steel welding joint.

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