[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 -----

From: Ali Asghari

To: materials-welding@googlegroups.com

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.

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