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[MW:2000] Re: effect of H on notch strength

By Materials & Welding
Chaps,
 
Please find the attachment, hopefully clarify the things,
 


 
On Tue, Apr 21, 2009 at 7:36 PM, Ali Asghari <asghariali@rocketmail.com> wrote:
hi oven
thank you for answer,but i dont understand yet.
because the toughness in -100 is more than in 50,why?
another question:this figure is true in all steel?
regard advance

From: Owen Jenkins <owen@osjl.co.uk>

To: materials-welding@googlegroups.com
Sent: Sunday, April 19, 2009 12:20:17 PM
Subject: [MW:1985] Re: effect of H on notch strength

Ali,
The top line shows the toughness of the base material without hydrogen embrittlement occurring - toughness increases steadily with increasing temperature.
 
The lower, V-shaped line shows that the effect of hydrogen embrittlement is worst at about 50°C, decreasing rapidly as the temperature increases (and the ability of the hydrogen to diffuse out of the metal increases) and also decreasing at lower temperatures, where reaction rates are much lower and the density of hydrogen increases, hence its volume decreases.
 
Other may wish to add more to this simple approach. Does this help?
 
Regards,
Owen.
----- Original Message -----
Sent: Saturday, April 18, 2009 11:31 AM
Subject: [MW:1980] effect of H on notch strength



hi
can anybody explain about this picture?
rgds.










--
Thanks & regards,

K.Babu
Welding Engineer,
PPL Shipyard Pte Ltd
Singapore
HP:  +65 94815990
Skype: psgbabu


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