Comparative study on process-structure-property relationships of TiC/Ti6Al4V and Ti6Al4V by selective laser melting
Titanium matrix composites (TMCs) have gained tremendous attention due to their excellent mechanical properties by combining the advantages of Ti6Al4V matrix and ceramic reinforcement. In current study, the selective laser melting (SLM) technique is applied to manufacture TiC/Ti6Al4V and Ti6Al4V. Systematic characterization and analysis are conducted to reveal and compare their process-structure-property relationships. The results reveal that the near fully dense parts could be manufactured by process optimization upon the systematic investigation on their densification behaviors. The addition of TiC effectively refines the matrix grain and changes the microstructures. The SLM-manufactured (SLM-ed) Ti6Al4V exhibits typical coarse columnar grains with ultrafine lamellar α+β microstructures distributed inside (average α-lath thickness: 282 nm). Nevertheless, the SLM-ed TMCs possess a peculiar molten pool morphology, in which the sub-columnar grains grow upward along the direction of the steepest temperature gradient. The acicular nanoscale TiC is dispersed inside the sub-columnar grains, while the chain-like TiC is distributed along the boundary. Meanwhile, an evolution process is proposed to describe the microstructure evolution of the SLM-ed TMCs. The interrelationships between energy density and resulting microstructures are also identified, based on which, strong and ductile Ti6Al4V specimens (tensile strength: 1390 MPa, elongation: 9.66%) and ultra-strong TMCs specimens (tensile strength: 1538 MPa) are manufactured. The strengthening effects are mainly attributed to the Hall-Petch strengthening and load-bearing transformation. Fracture analysis indicates that the failure of the SLM-ed Ti6Al4V is caused by the micro-voids nucleation and coalescence at the interface of α and β phases, whereas the premature fracture of the SLM-ed TMCs is originated from the chain-like TiC.
Science, Technology and Innovation Commission of Shenzhen Municipality[JSGG20210420091802007];
|WOS Research Area|
Engineering ; Mechanics
Engineering, Mechanical ; Mechanics
|WOS Accession No|
|ESI Research Field|
Cited Times [WOS]:2
|Document Type||Journal Article|
|Department||Southern University of Science and Technology|
1.Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics,Southern University of Science and Technology,Shenzhen,518055,China
2.Department of Mechanical Engineering,Research Institute of Advanced Manufacturing,the Hong Kong Polytechnic University,Kowloon,Hung Hom,Hong Kong
|First Author Affilication||Southern University of Science and Technology|
|First Author's First Affilication||Southern University of Science and Technology|
Jiang，Qinghong,Li，Shuai,Guo，Sai,et al. Comparative study on process-structure-property relationships of TiC/Ti6Al4V and Ti6Al4V by selective laser melting[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2023,241.
Jiang，Qinghong,Li，Shuai,Guo，Sai,Fu，Mingwang,&Zhang，Bi.(2023).Comparative study on process-structure-property relationships of TiC/Ti6Al4V and Ti6Al4V by selective laser melting.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,241.
Jiang，Qinghong,et al."Comparative study on process-structure-property relationships of TiC/Ti6Al4V and Ti6Al4V by selective laser melting".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 241(2023).
|Files in This Item:||There are no files associated with this item.|
|Recommend this item|
|Export to Endnote|
|Export to Excel|
|Export to Csv|
|Similar articles in Google Scholar|
|Similar articles in Baidu Scholar|
|Similar articles in Bing Scholar|
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.