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Dynamic Properties of High Endurance Gears

Dynamic Properties of High Endurance Gears. Heron A. Rodrigues, Masa Hanada, Ryu Goto, and Ron Steranko. Engineered Sintered Components, Inc. 250 Old Murdock Road Troutman, North Carolina 28166. Dynamic Properties of High Endurance Gears. Impact + Fatigue = Impact-Fatigue Life.

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Dynamic Properties of High Endurance Gears

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  1. Dynamic Properties of High Endurance Gears Heron A. Rodrigues, Masa Hanada, Ryu Goto, and Ron Steranko Engineered Sintered Components, Inc. 250 Old Murdock Road Troutman, North Carolina 28166

  2. Dynamic Properties of High Endurance Gears Impact + Fatigue = Impact-Fatigue Life

  3. OBJECTIVES • Enhance the dynamic properties of high endurance pinion gears • Evaluate the dynamic properties by simulating actual field conditions • Clarify the relationship between the impact-fatigue strength properties and the material structure.

  4. Experimental Mix Compositions and Green Density Compacted at 690 MPa (50 Tsi).

  5. Impact Fatigue Test Rig

  6. Determination of Ideal Sintering Conditions (Mix K Baseline)

  7. Pre-Alloy Mix Average IFL

  8. Elemental Mix Average IFL

  9. Partial Alloy Mix Average IFL

  10. Pre-Alloy Probability Plot (Weibull Distribution)

  11. Elemental Probability Plot (Weibull Distribution)

  12. Partial Alloy Probability Plot (Weibull Distribution)

  13. Impact Fatigue Life(Weibull Fit)

  14. 95% IFL Ranking

  15. Comparison of Average and 95% Impact Fatigue Life

  16. Correlation of Final Density and 95% Impact Fatigue Life

  17. Correlation of Tooth Strength and 95% Impact Fatigue Life.

  18. Correlation of Radial Crush Strength and 95% IFL

  19. Correlation of Apparent Hardness and 95% IFL

  20. Effect of Nickel Content on 95% Impact Fatigue Life

  21. Effect of Carbon Content on95% Impact Fatigue Life

  22. Green and Final Density Comparison

  23. SUMMARY • Dynamic properties of high endurance gears were evaluated by simulating field service conditions with an impact-fatigue test rig. • P/M mixes utilizing three alloying modes with varying amounts of Ni, Cu, Mo, and C were evaluated for dynamic performance. • To limit processing costs, gears were single pressed and sintered, then heat treated.

  24. CONCLUSIONS • Higher sintering temperature = significant improvement in impact fatigue properties • Significant improvement when Ni content increased from 4% to 6% • Carbon also beneficial, except in material F, which performed well even without added carbon

  25. CONCLUSIONS (cont.) • A density increase within a given alloying mode results in improvement of 95% IFL • No correlation was evident between the 95% IFL and mechanical properties such as hardness, radial crush strength and tooth strength

  26. CONCLUSIONS (cont.) • The pre-alloy based material D resulted in optimum 95% IFL: • Homogeneous microstructure • Strong matrix • Large rounded pores • Higher mean pore spacing

  27. CONCLUSIONS (cont.) • Elemental (F) and partial alloy (J) mixes: • Slightly better average IFL than mix D • Lower 95% IFL due to microstructural variation

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