Z2CND18.12N is the main material used in the primary pipelines of the pressurized water reactor due to its excellent characteristics. In the consideration of its serious environment, the cyclic deformation of material at high temperatures is concerned. A series of multiaxial ratcheting experiments were conducted at room, 350℃ and 550℃. These experiments contained circular, rhombus and uniaxial loading paths with different mean stresses and stress amplitudes. At elevated temperature conditions, it got quick shakedown in multiaxial cases which is similar in uniaxial ones indicating that dynamic strain aging (DSA) exists. At room temperature, ratcheting strain of uniaxial case fell between circular case and rhombus case, however, it showed lower ratcheting strain in multiaxial tests than in uniaxial tests at both 350℃ and 550℃ conditions. Besides of that, at 350℃, the ratcheting strain of circular case was higher than the rhombus case, while it is opposite at 550℃. From the two aspects above, it can be seen that nonproportionality of loading is constant but the DSA effect was strengthened with temperature increasing, which results in different ratcheting deformation. Therefore, it can be inferred that, under elevated temperatures, with DSA effect enhancing, the DSA and nonproportionality loading play a coupled effect on ratcheting deformation.


Multiaxial Ratcheting Deformation of z2cnd18.12n at Elevated Temperatures

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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