Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 826, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141935
Keywords
Titanium-Nitrogen; Selective laser melting; Heat treatment; Heterogeneous microstructure; Deformation mechanism
Categories
Funding
- JST-Mirai Program [JPMJMI17E6]
- Council for Science, Technology and Innovation (CSTI) , Cross-ministerial Strategic Innovation Promotion Program (SIP) , Materials Integration for revolutionary design system of structural materials (Funding agency: JST)
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This study investigates the enhancement of ductility in SLM-processed Ti-(N) materials through post-heat treatment N dissolution, finding that quenching significantly increases ductility by altering grain morphology, dislocations, and N distribution. Examination techniques such as EPMA, TEM, high-temperature SEM observation, and in-situ EBSD observation during tensile testing were utilized to clarify the microstructural evolution and deformation response of the materials.
Light elements such as oxygen (O) and nitrogen (N) significantly impact the microstructure and mechanical properties of Ti-based materials through solid solution strengthening. The microstructures of Ti-based materials processed via selective laser melting (SLM) have also been observed to contain a martensitic phase that improves the tensile strength. However, this improvement is achieved at the cost of reduced ductility. This study considered the use of post-heat treatment N dissolution to enhance the ductility of SLM-processed alpha-Ti materials. Tensile testing of the as-fabricated SLM Ti-(N) revealed a significantly increased strength of similar to 1200 MPa and a low ductility of 5% for N content of 0.5 wt%. However, the quenched samples exhibited increased ductility by up to 20%, with the microstructure, including primary alpha(alpha(p)) and transformed beta structures. Further examination via electron probe micro-analysis (EPMA), transmission electron microscopy (TEM), in-situ high-temperature SEM observation and in-situ EBSD observation during tensile testing revealed that the enhancement in ductility of the quenched SLM-processed Ti-(N) samples was significantly due to alteration of the grain morphology, dislocations and N distribution. The findings of this study further clarify the microstructural evolution and deformation response of SLM-processed Ti-(N) materials under water quenching.
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