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Ameya Joshi
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Why is the actual value of temperature, at which alloy is at a risk of creep, higher than the expected 0.3 (or 0.4)
of melting point?
of melting point?
mpotsengshimi03 said:can anyone of you guys please tell me different ways of preventing or minimizing creep in materials?
thank you so muchyirmidokuz said:Grain boundaries are very weak areas when compared to lattice structure. Thus, they are prone to creep behavior. Therefore less grain boundaries you have, high creep resistance you have. That means, if you can increase your average grain size, you will have higher creep resistance compared to small grain sized material.
Which is why turbine blades are preferably single crystal.yirmidokuz said:Grain boundaries are very weak areas when compared to lattice structure. Thus, they are prone to creep behavior. Therefore less grain boundaries you have, high creep resistance you have. That means, if you can increase your average grain size, you will have higher creep resistance compared to small grain sized material.
Inspector Eng said:I am trying to do a creep rupture test at high temperature to a tube with dia. 5'', thick. 6.5mm. Can anyone help me with the standard specimens diamensions, especially the length of this specimen. Is the whole specimen covered with the furnace ?
thanks for any effort
The creep temperature is typically higher than the melting point because creep is a process that occurs at high temperatures and under constant stress, while the melting point is the temperature at which a material transitions from a solid to a liquid state. In other words, the melting point is a characteristic of the material itself, while creep is a phenomenon that is influenced by external factors such as temperature and stress.
Creep is the gradual deformation of a material under constant stress at high temperatures. It is a time-dependent process that occurs over an extended period of time. In contrast, melting is the transformation of a solid material into a liquid state when it reaches its melting point. Melting is an instantaneous process, whereas creep is a continuous process.
Yes, there is a relationship between creep temperature and melting point. Generally, materials that have higher melting points also have higher creep temperatures. This is because materials with high melting points are more resistant to deformation and can withstand higher temperatures and stress before undergoing creep.
There are several factors that can affect the creep temperature of a material, including temperature, stress, and time. Higher temperatures and stress levels can accelerate the creep process, while longer periods of time can also contribute to creep deformation. Additionally, the composition and microstructure of the material can also impact its creep behavior.
Creep temperature can be measured through various techniques such as creep testing or stress relaxation testing. These tests involve applying a constant stress to a material at different temperatures and measuring the resulting deformation over time. The temperature at which the material starts to deform significantly is considered the creep temperature.