Study on plastic strengthening and damage effects of commercial pure titanium based on small punching test
To explore the plastic strengthening and damage effects of plastic deformation on TA2,small punching tests of TA2 with differ-ent plastic deformations were carried out.The results show that within the plastic deformation of 15%,the strength parameters of small punching tests indicate that plastic deformation has strengthening effect on TA2,and the yield strength and tensile strength are improved.The strengthening rates are 12.8%and 10.9%,respectively,and the yield ratio remains basically unchanged.When the plastic deform-ation reaches 15%,the increase amplitude of yield strength decreases,while the tensile strength slightly decreases,resulting in the con-stant increase of yield ratio until 1.Therefore,within small plastic deformation range,it is beneficial for the plastic strain strengthening of TA2,but when the plastic deformation exceeds 15%,the strengthening effect of plastic deformation is no longer significant,and the plas-tic damage tends to be obvious,resulting in the decrease of the toughness of material.Finally,based on the microstructure analysis,it can be found that within the plastic deformation of 15%,the reasons for the strengthening is the action of twin structure.When the plastic deformation exceeds 15%,the reasons for plastic damage are:on the one hand,some of the deformable of grains is consumed during plastic strengthening,and on the other hand,a large number of slip bands accumulate at the grain boundary,resulting in the decrease of the toughness of material.
small punching testcommercial pure titanium TA2plastic strengtheningplastic damage
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