What is Autofrettage and How Does it Improve Material Elasticity?

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vin300
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I'm not sure I understand everything written on Wikipedia about it. The cylinder has compressive stress on the inside, it is heat treated to increase the elastic limit. I never knew that materials could be made more elastic by heat treatment, only that it could relieve stresses and improve life.
 

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Increasing the "elastic limit", the range of elasticity, is not the same as changing the elasticity of a material.
 
The objective is to reduce operating stresses by inducing residual stresses. If it is put into a furnace the residual stresses will go away and things will go back to where it started from.