Thanks Mr. Ghulam for your response,
My conclusion is,
SLOW COOLING > Grain growth > Coarse grains > high ductility, softness & Low hardness
RAPID COOLING > Fine grains > high hardness
But I think large grain structure shows very low impact strength. So how does the TOUGHNESS increases with increase in grain size. Please explain & correct me if I am wrong.
S.Binoy
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ghulam Haider
Sent: Monday, April 22, 2013 10:17 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:17510] Effect of grain growth in toughness and Softness of a metal
grain size is directly related to the toughness of the material.larger the grain size,more is the toughness of materials. Grain size and hardness are inversely related,i.e smaller the grain size, more is the hardness. Ductility is directly related to the grain size. Grain growth is increase in the grain size..so if the grain size increases,ductility and toughness increase and hardness decreases. And as far as heat treatment is concerned, plz specify what exactly you want to know
regards
Ghulam Haider
final year student
Gik Institute
From: Binoy Soman <binoy.spp@DAELIM.CO.KR>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Monday, April 22, 2013 3:18 PM
Subject: [MW:17506] Effect of grain growth in toughness and Softness of a metal
Dear experts,
Kindly explain the relation between grain growth, toughness, hardness & ductility. If anybody have some texts which explains the basic changes that happens during heat treatment, please share.
S.binoy
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