تأثیر کار سرد بر ریزساختار و بافت کریستالی ورق فولادی API 5L X70 در سطح و مقطع 45 درجه آن

نوع مقاله : علمی و پژوهشی

نویسندگان

گروه مهندسی مواد و متالورژی، دانشکده مهندسی، دانشگاه فردوسی مشهد، ایران

چکیده

در مطالعه حاضر، ترکیبی از روش‌های آنالیز طیف‌سنجی پراش پرتو ایکس، میکروسکوپ الکترونی روبشی نشر میدانی (FESEM) و میکروسکوپ نوری برای بررسی تغییرات ریزساختار و بافت کریستالی فولاد خط لوله API 5L X70 به دنبال یک فرآیند کار سرد شدید که منجر به کاهش ضخامت 80 درصدی در نمونه شد، استفاده شد. تمام بررسی‌ها بر روی دو مقطع مختلف نمونه شامل سطح و مقطع شیبدار °45 نسبت به سطح انجام شد. در واقع، این دو مقطع به گونه‌ای انتخاب شده‌اند که زاویه بین دو صفحه کریستالوگرافی مهم (100) و (110) را نشان دهند. تجزیه و تحلیل‌های FESEM و میکروسکوپ نوری نشان داد نمونه اولیه دارای ریزساختاری ریزدانه شامل فاز زمینه فریتی و فازهای ثانویه بینیت بالایی به همراه جزایر مارتنزیت/آستنیت باقیمانده با مورفولوژی نواری در بین آن بود. همچنین مورفولوژی ریزساختار اولیه شامل دانه‌های اکثرا هم‌محور بود که پس از اعمال کار سرد در اثر قرار گرفتن تحت فشار شدید به ریزساختاری با مورفولوژی دانه‌های کشیده شده در سطح نرمال و به خصوص در سطح با زاویه °45 تبدیل می‌شود. تجزیه و تحلیل تغییرات جهت‌گیری کریستالی توسط طیف‌سنجی پراش پرتو ایکس نشان داد چگالی صفحات کریستالوگرافی {100} در اثر کار سرد اعمالی در سطح کاهش یافته و به صورت هم‌زمان چگالی صفحات کریستالوگرافی {110} روی سطح افزایش می‌یابد. همچنین نتایج حاصل ثابت کرد صفحات کریستالوگرافی {100} بر روی نمونه از مقطع °45 جایگزین صفحات کریستالوگرافی {110} شدند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The Effect of Cold Rolling on the Microstructure and Texture Evolution of API 5L X70 Steel in Normal and 45° Tilted Cross Section

نویسندگان [English]

  • Seyed Hossein Hosseini Mortazavi
  • Mostafa Mirjalili
  • Mohammad Hadi Moayed
  • gholamreza ebrahimi
  • Ghasem Barati Darband
Department of Materials and Metallurgical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
چکیده [English]

In the present study, a combination of X-ray diffraction spectroscopy, field emission scanning electron microscopy (FESEM) and optical microscopy methods were used to investigate the microstructure and crystallographic texture changes of API 5L X70 pipeline steel following an extreme cold working process that resulted in reduce the thickness of 80% in the sample. All investigations were done on two different sections of the sample, including the surface and the inclined section rotated 45 degrees relative to the surface. In fact, these two cross-sections are chosen to show the angle between the two important crystallographic planes of {100} and {110}. FESEM and optical microscope analyzes showed that the microstructure of the primary steel includes granular bainite, conventional upper bainite, and martensite-austenite islands. The results showed that the morphology of the initial microstructure consisted of mostly equiaxed grains, which after applying cold work due to being subjected to severe pressure, turns into a microstructure with the morphology of elongated grains, especially in the rotated section. Analysis of crystal orientation changes by X-ray diffraction spectroscopy showed that the density of {100} crystallographic planes decreased due to applied cold work on the surface and at the same time the density of {110} crystallographic planes on the surface increased. Also, the results proved that {100} crystallographic planes were replaced by {110} crystallographic planes on the sample rotated by 45 degrees.

کلیدواژه‌ها [English]

  • X70 steel
  • cold rolling
  • texture
  • microstructure
  • grain boundary

مراجع

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