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Industrialpureironspecimenswiththethicknessvariedfrom0.2to2.0mmwereinvestigatedintensiletesttoexaminetheinfluencesof specimen thickness on elongation and deformation energy. Conventionally, the total elongation of tensile specimen can be converted by JIS 0202-1987 formula, which is related to the tensile test specimen thickness. However, in this experiment, it was noticed that there were number of factors which led to the inaccuracy in the result. The totalelongationwasinfluencedbythestresstriaxiality.AccordingtotheFEM(FiniteElementMethod)analysis,itshowedthatthestress triaxialityincreasedsignificantlywiththethinnerspecimen,thiswasduetothevoidgrowthbehavior,observedbySEM(ScanningElectron Microscope)underlowvoltage.Theseresultsrevealedthatvoidsnucleationandgrowthbehaviorinfluencedbythestresstriaxialitywerethe main cause for the formula incompatibility. After the tensile test, stress-strain curve can be obtained and categorized into the uniform and local deformation. The uniform deformation energy was not depended on the specimen thickness in contrast to duplex stainless steel of previous study. On the other hand, the local deformation energy lowered with the decrease in specimen thickness as with duplex stainless steel. These results indicated that the void nucleation andgrowthbehaviorhadasignificantimpactonthetotalelongation.

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