Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys
Abstract
:1. Introduction
2. Investigation of Static Stretching and Dynamic Non-Equilibrium Process (DNP) of Alloys VT23 and VT23M
- 1
- Static stretching to fracture (VT23M and VT23);
- 2
- Impact toughness testing (VT22M):
- -
- in the initial state;
- -
- after DNP.
3. Algorithm for Image Analysis
3.1. Algorithm
- area ;
- coefficient of roundness ;
- visual depth in units of image intensity.
3.2. Equivalent Diameters of Dimples Analysis
3.2.1. Static Stretching
3.2.2. Impact Toughness
4. Macroparameters as an Integral Indicator
4.1. Shape and Depth of Dimples
4.1.1. Static Stretching
4.1.2. Impact Toughness
4.2. Additional Characteristic of the Surface
4.2.1. Relative Share of the Surface Covered with Dimples and Average Dimple Size
4.2.2. Static Stretching
4.2.3. Impact Toughness
5. Conclusions
Author Contributions
Conflicts of Interest
References
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Fe | Cr | Mo | V | Ti | Al |
---|---|---|---|---|---|
0.5–0.8 | 1.0–1.4 | 1.8–2.5 | 4.3–5.0 | 86.0–89.3 | 4.4–6.3 |
Titanium Alloys | Mechanical Properties | ||
---|---|---|---|
σys, MPa | σus, MPa | δ, % | |
VT23 | 980–1180 | 1080–1280 | 15 |
VT23M | 1000–1150 | 1080–1180 | 20 |
Schemes of Deformation | Relative Strain, ε, % | , μm | N, pcs | Relative Shares of Dimples, Sr, % | Relative Shares of Interstices, Sb, % | |
---|---|---|---|---|---|---|
Static fracture | VT23 | 17.40 | 2.84 | 1038 | 74.04 | 25.96 |
VT23M | 22.30 | 3.13 | 767 | 75.19 | 24.81 | |
Impact fracture | VT23M | - | 3.75 | 571 | 80.22 | 19.78 |
VT23M after DNP | - | 2.74 | 695 | 75.59 | 24.41 |
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Konovalenko, I.; Maruschak, P.; Prentkovskis, O. Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys. Metals 2018, 8, 161. https://doi.org/10.3390/met8030161
Konovalenko I, Maruschak P, Prentkovskis O. Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys. Metals. 2018; 8(3):161. https://doi.org/10.3390/met8030161
Chicago/Turabian StyleKonovalenko, Ihor, Pavlo Maruschak, and Olegas Prentkovskis. 2018. "Automated Method for Fractographic Analysis of Shape and Size of Dimples on Fracture Surface of High-Strength Titanium Alloys" Metals 8, no. 3: 161. https://doi.org/10.3390/met8030161