آمار
| تعداد نشریات | 22 |
| تعداد شمارهها | 485 |
| تعداد مقالات | 5,045 |
| تعداد مشاهده مقاله | 9,290,881 |
| تعداد دریافت فایل اصل مقاله | 6,135,353 |
The Effect of ECAP Process on the Microstructure and Mechanical Properties of AISI 1020 Plain Carbon Steel | ||
| Journal of Stress Analysis | ||
| دوره 8، شماره 2، خرداد 2024 | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22084/jrstan.2024.28517.1250 | ||
| نویسنده | ||
| K. Hajizadeh* | ||
| Faculty of Materials Engineering, Urmia University of Technology, Urmia, Iran | ||
| چکیده | ||
| In the present study, the equal channel angular pressing (ECAP) was applied on AISI 1020 plain carbon steel to refine the grain size down to the sub-micrometer range. ECAP was conducted up to 10 passes at 300 °C in a die with a channel angle of 105°. The microstructure before and after ECAP was observed in two different scales using a light microscope and a transmission electron microscope (TEM). Evaluation of mechanical properties was carried out by tensile tests and microhardness measurements. The results indicate that by applying 10 passes of ECAP, an ultrafine-grained microstructure with a mixture of equiaxed and elongated grains with an average grain size and width of 320 and 270 nm, respectively, is formed in the steel. In addition, the analysis of the X-ray peak profiles of the ECAP-ed samples shows that inside the grains, there are finer microstructural components such as dislocation cells/subgrains. The average size of these components was measured at ~143 nm. In terms of mechanical properties, it was proven that ECAP is very effective in improving the strength and hardness of the steel. It causes a three times growth in yield strength from 280 MPa to 1100 MPa and a 1.67 times increase in hardness from 125 to 395 Vickers. At the same time, the studied material showed an acceptable ductility of εf = 14.8% at these high strength levels. These promising mechanical properties was discussed in terms of characteristics of the ECAP-produced microstructure: extremely fine grains/subgrains, and increased dislocation density. | ||
| کلیدواژهها | ||
| Equal channel angular pressing؛ AISI 1020؛ Ultrafine-grained materials؛ XRD؛ TEM | ||
|
آمار تعداد مشاهده مقاله: 42 |
||