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Gradient microstructure and microhardness in a nitrided 18CrNiMo7-6 gear steel
| Content Provider | Scilit |
|---|---|
| Author | Yang, R. Wu, G. L. Zhang, X. Fu, W. T. Huang, X. |
| Copyright Year | 2017 |
| Description | Journal: Iop Conference Series: Materials Science and Engineering A commercial gear steel (18CrNiMo7-6) containing a tempered martensite structure was nitrided using a pressurized gas nitriding process under a pressure of 5 atm at 530 °C for 5 hours. The mechanical properties and microstructure of the nitrided sample were characterized by Vickers hardness measurements, X-ray diffraction, and backscatter electron imaging in a scanning electron microscope. A micro-hardness gradient was identified over a distance of 500 μm with hardness values of 900 HV at the top surface and 300 HV in the core. This micro-hardness gradient corresponds to a gradient in the microstructure that changes from a nitride compound layer at the top surface (~ 20 μm thick) to a diffusion zone with a decreasing nitrogen concentration and precipitate density with distance from the surface, finally reaching the core matrix layer with a recovered martensite structure. |
| Related Links | http://iopscience.iop.org/article/10.1088/1757-899X/219/1/012047/pdf |
| ISSN | 17578981 |
| e-ISSN | 1757899X |
| DOI | 10.1088/1757-899x/219/1/012047 |
| Journal | Iop Conference Series: Materials Science and Engineering |
| Issue Number | 1 |
| Volume Number | 219 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2017-07-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Iop Conference Series: Materials Science and Engineering Coatings and Films Gradient Microstructure |
| Content Type | Text |
| Resource Type | Article |
