Author/Authors :
Q.Auzoux، نويسنده , , L.Allais، نويسنده , , C.Caës، نويسنده , , B.Girard، نويسنده , , I.Tournié، نويسنده , , A.F.Gourgues، نويسنده , , A.Pineau، نويسنده ,
Abstract :
Thisstudyisdevotedtotheeffectofamultiaxialstressstateandofpre-strainingonthecreeppropertiesofanausteniticstainlesssteel.Creeptestsonbothsmoothandnotchedspecimenshavebeencarriedoutontype316L(N)steelat600°C.Incomparisontotheannealedstate,pre-strainingcausedasubstantialincreaseincreeplifetimebutalsoadramaticdropinintergranulardamageresistance.Theeffectofapre-strainoncreepductilitywassostrongthatcompacttensionspecimensinpre-strainedstatetestedunderrelaxationconditionscracked,whereasspecimensinannealedstatewerenotpronetocracking.Amodeltakingintoaccountbothpre-strainandmultiaxialeffectswasdevelopedandidentifiedonthebasisoflocalintergranularmicro-cracksmeasurementsonnotchedspecimens.Itsatisfactorilypredictstheresultsofrelaxationcrackpropagationtests.Thismodelmayalsoprovideausefulestimationoftherelaxationcrackingriskof316L(N)asafunctionofpre-strainlevelandstresstriaxialityratio.
