Quantitative analysis of microstructure and effects of heat treatment on properties of TC18 titanium alloy
In order to investigate the influence law of solid solution+aging process on the organisation and properties of TC18 titanium alloy.The volume fraction of primary phase(αp)in the alloy was controlled by controlling the solid solution temperature in the(α+β)two-phase region,and the proportion and size of secondary phase(αs)were regulated by controlling the aging temperature,which was quantitatively characterised with high precision by MIPAR's deep learning module based on qualitative analyses of the process-organisation-property evolution law.The results show that when aging at 500℃,with the increase of solid solution temperature(710-860℃),the volume fraction of incipient phase(αp)decreases about 45.03%,the strength of the alloy is increased by 273.66 MPa,and the plasticity is decreased by 9.39% .When aging at 550℃,with the increase of solid solution temperature(710-860℃),the volume fraction of incipient phase(αp)decreases about 58.78%,the strength of the alloy increased by 367.72 MPa and the plasticity decreased by 9.89% .Conclusion:The solid solution treatment can control the content of primary phase(αp)and thus affect the plasticity of the alloy,while the aging treatment can control the size and content of secondary phase(αs)and affect the strength of the alloy,and the comprehensive performance of the alloy can be improved by setting high solid solution temperature and low aging temperature.
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