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بهبود رفتار سایشی فولاد آلیاژی زنگ‌نزن L 304 فراوری‌شده با روش پرس‌کاری شیارمقید | ||
| مکانیک هوافضا | ||
| مقاله 2، دوره 20، شماره 2 - شماره پیاپی 76، تیر 1403، صفحه 17-28 اصل مقاله (1.14 M) | ||
| نوع مقاله: گرایش ساخت و تولید | ||
| نویسندگان | ||
| مسعود فرج الهی1؛ محمود ابراهیمی* 2؛ شهرام آجری3 | ||
| 1کارشناسی ارشد، گروه مهندسی مکانیک، دانشکده فنی مهندسی، دانشگاه مراغه، ایران | ||
| 2نویسنده مسئول: دانشیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| 3دانشیار، گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه مراغه، مراغه، ایران | ||
| تاریخ دریافت: 04 دی 1402، تاریخ بازنگری: 23 دی 1402، تاریخ پذیرش: 16 اسفند 1402 | ||
| چکیده | ||
| تغییرشکل پلاستیک شدید به‌عنوان یکی از روش‌های تولید مواد با اندازه دانه زیر میکرومتر و حتی فوق ریزدانه مطرح می‌باشد. در این راستا، فرایند پرس‌کاری شیارمقید یکی از این تکنیک‌ها برای اعمال بر روی نمونه‌های ورقه‌ای‌شکل می‌باشد. در این پژوهش، مقاومت به سایش و سختی نمونه‌های فولاد آلیاژی زنگ‌نزن L304 فراوری‌شده با روش پرس‌کاری شیارمقید شده مورد تجزیه‌وتحلیل قرار گرفت. نتایج حاکی از آن است که سختی نمونه آنیل شده برابر با 5/163 ویکرز و نمونه‌های پاس اول و سوم 7/373 و 5/389 ویکرز می‌باشد که نشان از افزایش 128 و 138 درصد سختی در پاس اول و سوم نسبت به نمونه آنیل شده است. همچنین، نتایج آزمون سایش نشان داد که نرخ سایش برای نمونه آنیل شده در نیروی نرمال 30 و 50 نیوتنی به ترتیب 049/0 و 16/1 درصد، برای نمونه پاس اول 041/0 و 56/0 درصد و برای نمونه پاس سوم 036/0 و 24/0 درصد می‌باشد. ازجمله دلایل افزایش سختی و مقاومت به سایش را می‌توان به نتایج کار سرد و افزایش چگالی نابجایی‌ها نسبت داد. اگرچه نابجایی‌ها باعث انعطاف‌پذیری بیشتر ماده و افزایش تغییرشکل پلاستیک آن می‌شوند ولی اگر چگالی نابجایی‌ها در ماده از حد معینی بیشتر شود، منجر به برهمکنش نابجایی‌ها و قفل شدن آن‌ها می‌شود و ماده تردتر می‌گردد. نتایج نشان داد که افزایش سختی و مقاومت به سایش با افزایش تعداد پاس‌های فرایند بهبود می‌یابد. | ||
تازه های تحقیق | ||
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| کلیدواژه‌ها | ||
| تغییرشکل پلاستیک شدید؛ مواد فوق ریزدانه؛ نرخ سایش؛ مورفولوژی سطح | ||
| عنوان مقاله [English] | ||
| Improving Wear Behavior of 304L Stainless Steel under Constrained Groove Pressing | ||
| نویسندگان [English] | ||
| Masoud Farajollahi1؛ Mahmoud Ebrahimi2؛ Shahram Ajori3 | ||
| 1M.Sc., Department of Mechanical Engineering, Faculty of Engineering, University of Maragheh, Maragheh, Iran | ||
| 2Corresponding author: Associate Professor, Faculty of Engineering, University of Maragheh, Maragheh, Iran | ||
| 3Associate Professor, Faculty of Engineering, University of Maragheh, Maragheh, Iran | ||
| چکیده [English] | ||
| Severe plastic deformation is considered one of the methods of producing materials with sub-micrometer and even ultra-fine-grained materials. The constrained groove pressing process is one of the severe plastic deformation methods for sheet-formed materials. In this research, the wear resistance and hardness of 304L stainless steel after being subjected to constrained groove pressing were analyzed with respect to the pass number. It was found that the hardness of the initial annealed sample was 163.5 HV, and It was equal to 373.7 and 389.5 HV in the first and third passes, showing an increase of 128% and 138% of hardness in the first and third passes compared to the initial sample. Moreover, the sample wear rate at the normal load of 30 N and 50 N was 0.049% and 1.16% for the initial annealed state, 0.041% and 0.56% for the first pass condition, and 0.036% and 0.24% for the final pass situation. The main reasons for the hardness improvement and wear resistance increase are related to the application of cold work and the increase of dislocation density. It should be mentioned that the dislocation movement makes the material more ductile (increase in the plastic deformation) if the density of dislocations in the material exceeds a certain limit, it leads to the interaction of dislocations and their locking; so, the material becomes more brittle. It can be concluded that the improvement of hardness and wear resistance increases with the addition of the pass number. | ||
| کلیدواژه‌ها [English] | ||
| Severe plastic deformation, Ultra-fine-grained materials, Wear rate, Surface morphology | ||
| مراجع | ||
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