The discussion centers on the phenomenon of creep in materials, particularly alloys, where the temperature at which creep becomes significant is often higher than 0.3 to 0.4 times the melting point. Creep is defined as time-dependent inelastic deformation influenced by stress, temperature, and time. Key factors affecting creep resistance include grain size, with larger grains providing better resistance due to fewer grain boundaries. The ASTM E139 standard is referenced for conducting creep rupture tests, which are crucial for understanding material behavior under high temperatures.
PREREQUISITESMaterials scientists, mechanical engineers, and researchers involved in high-temperature applications or those studying the long-term performance of alloys under stress.
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