Contact Fatigue Strength of Austempered Ductile Iron (ADI) in Gear Applications
Abstract
:1. Introduction
2. Objective and Approach
3. Test Parts, Test Rigs and Test Conditions
3.1. Test Parts
3.2. Test Rig and Test Conditions
4. Results and Discussion
4.1. Contact Fatigue Strength
4.2. Pitting Characteristics and Microstructural Changes of ADI
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Appendix A
Symbol | Unit | Definition |
---|---|---|
a | mm | Center distance |
A | % | Fracture elongation |
b | mm | Width of disk |
da | mm | Outer diameter of disk |
E | N/mm2 | Young’s modulus |
FN | N | Normal force |
FR | N | Friction force |
HBW | - | Brinnell hardness |
HV | - | Vickers hardness |
m | - | Slope of time yield straight |
mn | mm | Normal module |
n | min−1 | Rotational speed |
N | - | Number of load cycles |
pH | MPa | Hertzian contact pressure |
Q | min−1 | Volume flow rate |
rcrown | mm | Radius of disk crowning |
rb | mm | Base circle radius |
Ra | µm | Arithmetical average roughness |
Rz | µm | Average peak-to-valley height |
Rm | N/mm2 | Tensile strength |
Rp0.2 | N/mm2 | Yield strength |
s | % | Slippage |
t | µm | Depth |
T | °C | Temperature |
w | m/s | Tangential speed |
z1/2 | - | Number of teeth |
αn | ° | Normal pressure angle |
δ | µm | Amount of plasticdeformation of disk |
ν | - | Poisson’s ratio |
ρ | mm | Radius of curvature |
ω | s−1 | Angular speed |
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Carbon | Silicon | Manganese | Copper | Nickel | Molybdenum |
---|---|---|---|---|---|
C [wt.%] | Si [wt.%] | Mn [wt.%] | Co [wt.%] | Ni [wt.%] | Mo [wt.%] |
3.56 | 2.44 | 0.20 | 0.65 | 1 | 0.26 |
Material Grade | Tensile Strength | Yield Strength | Frac. Elongation | Brinnell Hardn. |
---|---|---|---|---|
ISO17804 [15] | Rm [N/mm2] | RP0.2 [N/mm2] | A5 [%] | HBW |
ADI JS/900-8C | 925 | 723 | 8.2 | 294–311 |
ADI JS/1200-3C | 1241 | 945 | 4.1 | 378–392 |
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Goergen, F.; Mevissen, D.; Masaggia, S.; Veneri, E.; Brimmers, J.; Brecher, C. Contact Fatigue Strength of Austempered Ductile Iron (ADI) in Gear Applications. Metals 2020, 10, 1147. https://doi.org/10.3390/met10091147
Goergen F, Mevissen D, Masaggia S, Veneri E, Brimmers J, Brecher C. Contact Fatigue Strength of Austempered Ductile Iron (ADI) in Gear Applications. Metals. 2020; 10(9):1147. https://doi.org/10.3390/met10091147
Chicago/Turabian StyleGoergen, Fabian, Dieter Mevissen, Stefano Masaggia, Enrico Veneri, Jens Brimmers, and Christian Brecher. 2020. "Contact Fatigue Strength of Austempered Ductile Iron (ADI) in Gear Applications" Metals 10, no. 9: 1147. https://doi.org/10.3390/met10091147