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Unformatted text preview: 430oC = "high" temperature for Pb;
melting point = 450oC
430oC = "low" temperature for Fe;
melting point = 1535oC
Chemical reaction rates go up as temperature goes up.
Environmental factors can become controlling. CREEP
When a material is under a constant load or
stress, it may undergo progressive plastic
deformation over a period of time at a constant
Time dependent strain CREEP TEST CONDITIONS
Above 1/2 absolute melting point
Plot change of length of specimen or strain vs. time Creep Test Result STAGES OF CREEP
Primary Creep Strain rate pr...
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- Fall '13