분말 3D 프린팅된 Ti-6Al-4V 합금의 피로특성에미치는 후열처리의 영향
Effect of post heat treatment on fatigue properties of EBM 3D-printed Ti-6Al-4V alloy
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Additive manufacturing by electron beam melting is an affordable process for fabricating near net shaped parts of titanium and its alloys. 3D additive-manufactured parts have various kinds of voids, lack of fusion, etc., and they may affect crack initiation and propagation. Post process is necessary to eliminate or minimize these defects. Hot isostatic pressing (HIP) is the main method, which is expensive. The objective of this paper is to achieve an optimum and simple post heat treatment process without the HIP process. Various post heat treatments are conducted for the 3Dprinted Ti-6Al-4V specimen below and above the beta transus temperature (996oC). The as-fabricated EBM Ti-6Al-4V alloy has an α‘-martensite structure and transforms into the α+β duplex phase during the post heat treatment. The fatigue strength of the as-fabricated specimen is 400 MPa. The post heat treatment at 1000oC/30 min/AC increases the fatigue strength to 420 MPa. By post heat treatment, the interior pore size and the pore volume fraction are reduced and this can increase the fatigue limit.
Abstract
Additive manufacturing by electron beam melting is an affordable process for fabricating near net shaped parts of titanium and its alloys. 3D additive-manufactured parts have various kinds of voids, lack of fusion, etc., and they may affect crack initiation and propagation. Post process is necessary to eliminate or minimize these defects. Hot isostatic pressing (HIP) is the main method, which is expensive. The objective of this paper is to achieve an optimum and simple post heat treatment process without the HIP process. Various post heat treatments are conducted for the 3Dprinted Ti-6Al-4V specimen below and above the beta transus temperature (996oC). The as-fabricated EBM Ti-6Al-4V alloy has an α‘-martensite structure and transforms into the α+β duplex phase during the post heat treatment. The fatigue strength of the as-fabricated specimen is 400 MPa. The post heat treatment at 1000oC/30 min/AC increases the fatigue strength to 420 MPa. By post heat treatment, the interior pore size and the pore volume fraction are reduced and this can increase the fatigue limit.
참고문헌 (15)
- D. Gibson, , Astrophys J., 705, pp.123~ (2009)[DOI]
- H.K. Rafi, , J. Mater. Eng. Perform., 22, pp.3872~ (2013)[DOI]
- V. Chastand, , Mater. Charact. (2018)
- N. Hrabe, , Int. J. Fatigue, 94, pp.202~ (2017)[DOI]
- 신기승, "Ti-10wt.%Al-xMn 분말합금의 Mn첨가에 따른 소결특성 평가", 한국분말재료학회지, 24(3), pp.235~241 (2017), 한국분말재료학회[DOI]
- T. Vilaro, , Metall. Mater. Trans. A, 42, pp.3190~ (2011)[DOI]
- T.H. Becker, , South Africal Journal of Industrial Engineering, 26, pp.1~ (2015)
- E. Wycisk, , Adv. Mater. Res., 816-817, pp.134~ (2013)[DOI]
- S. Hongbo, , Rare Met. Mater. Eng., 43, pp.780~ (2014)[DOI]
- A. Kirchner, , Euro PM2015 Proceedings: AM - Electron Beam Melting (2015)
- H. Beladi, , Acta Mater., 80, pp.478~ (2014)[DOI]
- T. Ahmed, , Mater. Sci. Eng., A, 243, pp.206~ (1998)[DOI]
- S.L. Lu, , Acta Mater., 104, pp.303~ (2016)[DOI]
- S.T. Williams, , Scripta Mater., 122, pp.72~ (2016)[DOI]
- Bin Zhang, , Solid Freeform Fabrication 2017: Proceedings of the 28th Annual International Solid Freeform Fabrication Symposium, pp.107~ (2017)