Dear Selastine,
Creep strength is the ability of a metal to withstand a constant force at elevated temperatures. At elevated temperature, material with small grain size will be prone to phenomenon of grain boundary sliding (as smaller the grain size, the larger will be the total boundary surface area per unit volume). Therefore material with larger grain will give better creep properties.
According to my (little) knowledge:
Small grain size→ high hardness, tensile strength, yield strength
Intermediate grain size → high toughness, good fatigue properties
Large grain size→ high creep strength, ductility
Regards,
Ali Samdani
On Wed, Apr 24, 2013 at 8:08 PM, Dr-alaa Zg <dralaazg@yahoo.com> wrote:
Creep is different failure mode, creep strength will be better as the grain size increased. The reason behind such behavior is that as the grain becomes coarse, grain boundary area will be minimized.
Dr. Eng. Alaa Abdulhasan Atiyah
UOT- Baghdad- iraq
From: selastine sudhakar <mechselastine@gmail.com>;
To: materials-welding@googlegroups.com <materials-welding@googlegroups.com>;
Subject: [MW:17550] creep strength vs grain sizeSent: Wed, Apr 24, 2013 4:09:19 PM
Dear experts
What is the relation between grain size and creep strength..
Thanks
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selastine
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