| Autor: |
da Silva, Sinval Pedroso, Abrão, Alexandre Mendes, Carneiro, José Rubens Gonçalves, da Silva, Ernane Rodrigues |
| Předmět: |
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| Zdroj: |
International Journal of Advanced Manufacturing Technology; Dec2024, Vol. 135 Issue 7/8, p3559-3575, 17p |
| Abstrakt: |
This study investigates the effectiveness of in-situ urea-assisted nitriding during electrical discharge machining (EDM) as a novel approach to enhance the fatigue performance of AISI 4140 steel. EDM is known to introduce surface defects and tensile residual stresses that compromise fatigue strength. By employing a urea-based dielectric solution, this method forms a protective nitride layer on the steel surface, which addresses these issues. Experimental results demonstrate significant improvements in fatigue life for nitrided specimens, with an increase of 24% at a stress amplitude of 388 MPa and up to 14-fold at 242 MPa. Additionally, surface tensile residual stresses were reduced by 26% in nitrided specimens. These enhancements are attributed to the formation of the nitride layer, which improves fatigue resistance and surface integrity. Compared to traditional nitriding methods, in-situ urea-assisted EDM nitriding offers several advantages, including the ability to simultaneously form the nitride layer and machine the component, reducing processing time and costs. This work underscores the promising potential of in-situ urea-assisted EDM nitriding as an effective strategy for improving the fatigue performance of AISI 4140 steel components and suggests directions for future research in surface modification techniques. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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