J. Mater. Sci. Technol. ›› 2020, Vol. 45: 146-156.DOI: 10.1016/j.jmst.2019.11.031
• Research Article • Previous Articles Next Articles
Haoqing Lia,b, Ming Wanga,b, Dianjun Louc, Weilong Xiac, Xiaoying Fanga,b,*()
Received:
2019-10-18
Revised:
2019-11-14
Accepted:
2019-11-29
Published:
2020-05-15
Online:
2020-05-27
Contact:
Xiaoying Fang
Haoqing Li, Ming Wang, Dianjun Lou, Weilong Xia, Xiaoying Fang. Microstructural features of biomedical cobalt-chromium-molybdenum (CoCrMo) alloy from powder bed fusion to aging heat treatment[J]. J. Mater. Sci. Technol., 2020, 45: 146-156.
Co | Cr | W | Mo | Si |
---|---|---|---|---|
63.9 | 24.7 | 5.4 | 5.0 | 1.0 |
Table 1 Chemical compositions of CoCrMo alloy (wt%).
Co | Cr | W | Mo | Si |
---|---|---|---|---|
63.9 | 24.7 | 5.4 | 5.0 | 1.0 |
Layer power | Spot size | Scan speed | Layer thickness | Preheating | Scan spacing |
---|---|---|---|---|---|
195 W | 100 μm | 1200 mm/s | 20 μm | 80 °C | 90 μm |
Table 2 SLM setup and process parameters.
Layer power | Spot size | Scan speed | Layer thickness | Preheating | Scan spacing |
---|---|---|---|---|---|
195 W | 100 μm | 1200 mm/s | 20 μm | 80 °C | 90 μm |
Fig. 6. Surface morphologies on the transverse cross-section (TC) ⊥ to build direction and longitudinal cross-section (LC in two different scales) // to build direction of the samples after polishing and etching.
No. | Phase | Co | Cr | Mo | W | Si |
---|---|---|---|---|---|---|
1 | Matrix | 62.12 | 25.95 | 5.09 | 6.52 | 0.68 |
2 | Matrix | 61.12 | 27.07 | 4.96 | 6.03 | 0.81 |
3 | Matrix | 63.52 | 25.46 | 5.03 | 4.98 | 1.01 |
4 | Matrix | 61.56 | 28.13 | 4.62 | 4.08 | 1.61 |
5 | Microsegregation zone | 57.97 | 24.02 | 5.87 | 11.07 | 1.07 |
6 | Microsegregation zone | 57.20 | 25.65 | 5.55 | 10.98 | 0.62 |
7 | Microsegregation zone | 56.40 | 24.82 | 5.65 | 12.23 | 0.90 |
8 | Microsegregation zone | 59.13 | 24.01 | 6.21 | 9.90 | 0.75 |
9 | Laves | 42.50 | 18.01 | 10.13 | 22.92 | 6.44 |
10 | Sigma | 42.60 | 34.98 | 14.12 | 7.32 | 0.98 |
Table 3 EDS results of different areas corresponding to Fig. 7.
No. | Phase | Co | Cr | Mo | W | Si |
---|---|---|---|---|---|---|
1 | Matrix | 62.12 | 25.95 | 5.09 | 6.52 | 0.68 |
2 | Matrix | 61.12 | 27.07 | 4.96 | 6.03 | 0.81 |
3 | Matrix | 63.52 | 25.46 | 5.03 | 4.98 | 1.01 |
4 | Matrix | 61.56 | 28.13 | 4.62 | 4.08 | 1.61 |
5 | Microsegregation zone | 57.97 | 24.02 | 5.87 | 11.07 | 1.07 |
6 | Microsegregation zone | 57.20 | 25.65 | 5.55 | 10.98 | 0.62 |
7 | Microsegregation zone | 56.40 | 24.82 | 5.65 | 12.23 | 0.90 |
8 | Microsegregation zone | 59.13 | 24.01 | 6.21 | 9.90 | 0.75 |
9 | Laves | 42.50 | 18.01 | 10.13 | 22.92 | 6.44 |
10 | Sigma | 42.60 | 34.98 | 14.12 | 7.32 | 0.98 |
Fig. 9. High-resolution EBSD map in the HT1 sample: (a) cellular grain morphology. (b) OIM based on IPF; (c) two phases distribution; (d) EBSD image quality.
Fig. 11. EBSD reconstructed OIMs (a-d and e-h) and GBCDs (a’-d’ and e’-h’) on the transverse cross-section (TC) and longitudinal cross-section (LC) for the samples. The grain boundaries of different misorientations were labeled by the color lines in Fig. 11(a’-d’) and (e’-h’), where red line represents twin boundary (TB).
Fig. 16. Residual scratch depth vs. length in the different directions on the transverse cross section-TC (a, c, e, g) and longitudinal cross section-LC (b, d, f, h).
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