بررسی رفتار تغییر شکل گرم فولاد ابزار W360 با استفاده از آزمایش فشار گرم

نویسندگان

دانشگاه صنعتی مالک اشتر، مجتمع دانشگاهی مواد و فناوری‌های ساخت

چکیده

در این پژوهش، به بررسی رفتار تغییر شکل گرم فولاد ابزار گرم‌کار W360، با انجام آزمایش فشار گرم در محدوده دمایی 1000 تا 1200 درجه سانتی‌گراد و نرخ­های کرنش 0/001، 0/01، 0/1 و 1 بر ثانیه پرداخته شده است. مطابق نتایج حاصل، تبلور مجدد دینامیکی مهم‌ترین عامل ترمیم این آلیاژ حین تغییر شکل گرم است. در فولاد W360 با افزایش دما و افزایش نرخ کرنش، تبلور مجدد افزایش یافته است. در دمای 1000 درجه سانتی‌گراد و نرخ کرنش یک بر ثانیه ساختار کاملاً تبلور مجدد یافته حاصل شده است و در دمای 1200 درجه سانتی‌گراد وقوع رشد دانه کاملاً مشهود است. همچنین با رسم نقشه فرایند این فولاد، محدوده بهینه تغییر شکل گرم آن تعیین شد. تصاویر ریزساختاری حاصل از آزمایش فشار گرم نشان داد که در دمای 1000 درجه سانتی‌گراد و نرخ کرنش 0/01 بر ثانیه، تبلور مجدد آغاز شده و با افزایش دما و افزایش نرخ کرنش، به‌دلیل افزایش انرژی ذخیره شده و درنتیجه افزایش مکان‌های مساعد برای جوانه‌زنی، تبلور مجدد توسعه می‌یابد. نتایج حاصل از رسم نقشه فرایند نشان داد، منطقه مناسب تغییر شکل گرم فولاد مورد بررسی، محدوده دمایی 1050 تا 1150 درجه سانتی‌گراد و نرخ کرنش 0/1 تا 1 بر ثانیه است.

کلیدواژه‌ها


عنوان مقاله [English]

EVALUATING HOT DEFORMATION BEHAVIOR OF W360 TOOL STEEL BY HOT COMPRESSION TEST

نویسندگان [English]

  • R. Amirarsalani
  • M. Morakabati
  • R. Mahdavi
Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Iran.
چکیده [English]

In this research, the hot deformation behavior of W360 tool steel was investigated using hot compression test at 1000-1200°C and strain rates of 0.001, 0.01, 0.1, and 1 s-1. According to the results, dynamic recrystallization was found the most important restoration factor of this alloy during hot deformation. Recrystallization was enhanced with an increase in temperature and strain rate. Also, the hot working process was optimized by drawing the processing map of this steel. Microstructural images obtained from the hot compression test showed that recrystallization started at 1000°C and the strain rate of 0.01 s-1 and developed with increasing temperature and strain rate due to an increase in the stored energy and suitable regions for nucleation. The results of drawing the processing map showed that the best hot deformation region was the temperature range of 1050-1150°C and strain rates of 0.1-1 s-1.

کلیدواژه‌ها [English]

  • W360 hot work tool steel
  • Hot compression test
  • Dynamic recrystallization
  • Processing map
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