J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (8): 1578-1586.DOI: 10.1016/j.jmst.2019.04.008
• Orginal Article • Previous Articles Next Articles
Sheng Caoab, Qiaodan Huc, Aijun Huangab*(), Zhuoer Chenb, Ming Suna, Jiahua Zhanga, Chenxi Fub, Qingbo Jiab, Chao Voon Samuel Limb, Rodney R.Boyerb, Yi Yanga*(), Xinhua Wub
Received:
2018-09-28
Revised:
2018-12-30
Accepted:
2019-01-26
Online:
2019-08-05
Published:
2019-06-19
Contact:
Huang Aijun,Yang Yi
About author:
1 These authors contributed equally to this work.
Sheng Cao, Qiaodan Hu, Aijun Huang, Zhuoer Chen, Ming Sun, Jiahua Zhang, Chenxi Fu, Qingbo Jia, Chao Voon Samuel Lim, Rodney R.Boyer, Yi Yang, Xinhua Wu. Static coarsening behaviour of lamellar microstructure in selective laser melted Ti-6Al-4V[J]. J. Mater. Sci. Technol., 2019, 35(8): 1578-1586.
Fig. 1. BSE images of as-SLMed Ti?6Al?4V at different magnifications (a, b); white arrow in (b) illustrates martensite lamellae containing twins, and associated inset is a high magnification image of twins inside lamellae.
Fig. 2. BSE images of post-SLM heat treatments at 700 °C for: (a) 1 h, (b) 2 h, (c) 4 h, and (d) 10 h. White arrows are twins inside lamella, and associated insets are high magnification BSE images. In all images, dark area is α phase and bright area is β phase.
Fig. 3. BSE images of post-SLM heat treatments at 800 °C for: (a) 0.5 h, (b) 1 h, (c) 2 h, (d) 4 h, (e) 6 h, and (f) 12 h. White arrows are twins inside lamella, and associated insets are high magnification BSE images. In all images, dark area is α phase and bright area is β phase.
Fig. 4. BSE images of post-SLM heat treatments at 900 °C for: (a) 0.5 h, (b) 1 h, (c) 2 h, (d) 4 h, (e) 6 h, and (f) 12 h. White arrows are equiaxed α grains. In all images, dark area is α phase and bright area is β phase.
Fig. 5. BSE images of post-SLM heat treatments at 950 °C for: (a) 0.5 h, (b) 1 h, (c) 2 h, (d) 4 h. White arrows are equiaxed α grains. In all images, dark area is α phase and bright area is β phase.
Fig. 6. Measured lamellar width of post-SLM heat treated Ti?6Al?4V at various temperatures with different holding times. Solid symbols were data points measured in this work, and the four hollow symbols at 700 °C/2 h, 800 °C/2 h, 800 °C/6 h, and 800 °C/12 h were data from a previous study [13].
Fig. 10. (a) Hardness of As-SLMed and post-SLM heat treated samples at 800 °C and 900 °C with different holding time, (b) a Hall?Petch relationship between hardness of post-SLM heat treated samples and measured α lath width in Fig. 6.
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