اثر زمان عملیات زیر صفر عمیق روی ریزساختار و خواص کششی فولاد ابزار ...

نوع مقاله : علمی و پژوهشی

نویسندگان

1 دانشکده مهندسی، واحد آیت الله آملی، دانشگاه آزاد اسلامی، آمل، ایران

2 دانشکده مهندسی مواد، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

3 دانشکده مهندسی مواد، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

برای افزایش کارآیی فولاد ابزار، دو گروه از خواص شامل سختی بالا و چقرمگی بالا اهمیت دارد. سختی با چقرمگی در تقابل است. با استفاده از عملیات زیرصفرعمیق می توان برای افزایش همزمان سختی، استحکام و چقرمگی اقدام نمود. به همین منظور از 12دسته نمونه فولاد ابزار 1.2542، 9دسته به مدت 24، 36 و 48ساعت در دمای 196-درجه سانتیگراد قرار گرفته و سپس به مدت 1، 2 و 3ساعت در دمای 200درجه سانتیگراد برگشت شده‌اند و3دسته دیگر به عنوان نمونه استاندارد (شاهد) در نظر گرفته شده‌اند. در نهایت برای 12دسته نمونه، عملیات زیرصفرعمیق مجددا تکرار شد. نتیجه آنکه برای نمونه‌ای که 36 ساعت در دمای 196- درجه سانتیگراد و 1 ساعت در دمای 200 درجه سانتیگراد برگشت شده بود (نمونه 361) به طور همزمان سختی 5/8 درصد، استحکام کششی 4/26 درصد، استحکام تسلیم 4/23 درصد و چقرمگی کششی 8/13 درصد نسبت به نمونه استاندارد افزایش یافت.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of Duration of Deep Cryogenic Treatment on Microstructure and T ensile properties of 1.2542 tool steel

نویسندگان [English]

  • Seyed Ebrahim Vahdat 1
  • Said Nategh 2
  • Shamsoddin Mirdamadi Tehrani 3
1 Department of Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran
2 Department of Materials Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
3 School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
چکیده [English]

Two groups of tool steel properties, namely high hardness and high toughness, are important for the performance of tool steels. Any increase in hardness occurs at the expense of reduced toughness. Deep cryogenic treatment may be used for increasing toughness, strength and hardness simultaneously. 12 sets of 1.2542 tool steel specimens that 9 of which have been deep cryogenically treated for 24, 36, and 48h at -196 oC and have been tempered for 1, 2, and 3h at 200 oC and then double deep cryogenic treatment has been done. 3 sets were selected as standard specimens (control specimens). The best results, simultaneous improvement of 13.8% in toughness, 8.5% in hardness, 26.4% in tensile strength and 23.4% in yield strength were obtained for the specimen treated at -196 oC for 36 hours and then tempered at 200 oC for 1 hour (specimen 361).

کلیدواژه‌ها [English]

  • Hardness
  • Scanning electron microscopy
  • strength
  • Toughness
  • Transmission Electron Microscopy

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