تاثیر عملیات کوئنچ و پارتیشن‌بندی بر ریزساختار و خواص کششی یک فولاد متوسط کربن پرسیلیسیم‌

نوع مقاله : علمی و پژوهشی

نویسندگان

1 مهندسی مکانیک، دانشگاه صنعتی بیرجند، بیرجند

2 مهندسی مواد و متالورژی، دانشگاه صنعتی بیرجند، بیرجند

چکیده

یکی از روشهای کاربردی جهت توسعه فولادهای استحکام بالا با انعطاف‌پذیری مناسب، عملیات حرارتی کوئنچ و پارتیشن‌بندی به منظور ایجاد یک ریزساختار میکروکامپوزیتی (مارتنزیت+آستنیت باقیمانده) است. به کمک این روش می‌توان با هزینه اندک، ترکیبی فوق‌العاده از خواص مکانیکی را در یک فولاد کم آلیاژ بوجود آورد. در پژوهش حاضر، فولاد متوسط کربن پرسیلیسیم 7102/1 با اعمال فرآیندهای کوئنچ و پارتیشن‌بندی مورد مطالعه قرار گرفته است و تاثیر پارامترهای مختلف از جمله دمای کوئنچ (محدوده دمایی 170 الی 230 درجه سانتیگراد) و زمان پارتیشن‌بندی (3 الی 30 دقیقه) روی ریزساختار و خواص کششی بررسی شده است. ریزساختار توسط میکروسکوپ نوری بررسی شده و کسر حجمی آستنیت باقی‌مانده، توسط تکنیک پراش پرتوی ایکس اندازه‌گیری شده است. نتایج بدست آمده نشان می‌دهد که ریزساختار میکروکامپوزیتی پس از عملیات حرارتی بوجود آمده است. افزایش زمان پارتیشن‌بندی باعث کاهش آستنیت باقیمانده و تشکیل رسوبات کاربیدی می‌گردد همچنین با افزایش دمای کوئنچ در زمان پارتیشن بندی 3 دقیقه ، درصد آستنیت باقی‌مانده و پایدارشده افزایش یافته است. بهترین خواص کششی مربوط به نمونه کوئنچ شده در 170 درجه سانتیگراد و پارتیشن‌بندی شده در 300 درجه سانتیگراد به مدت 8 دقیقه با استحکام کششی 1997 مگاپاسکال، استحکام تسلیم 1730 مگاپاسکال، ازدیاد طول 3/10 درصد و میزان کاهش سطح مقطع 48 درصد می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of quenching and partitioning process on the microstructure and tensile properties of medium carbon high silicon steel

نویسندگان [English]

  • Aliakbar Abedini 1
  • Habibollah Rastegary 2
  • syyed mohammad emam 1
1 Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran.
2 Department of Materials and Metallurgy Engineering, Birjand University of Technology, Birjand, Iran.
چکیده [English]

One of the practical methods for developing high strength steels with suitable ductility is quenching and partitioning process to create a micro-composite microstructure (martensite + residual austenite). In this regard, a good combination of mechanical properties can be produced in a low-alloy steel with a low cost. In the present study, a medium silicon carbon steel 1.7102 was studied by applying quenching and partitioning processes. For this purpose, the effect of quenching temperature (temperature range 170 to 230 °C) and partitioning time (3 to 30 min) were investigated on the microstructure and tensile properties. Microstructural observation was carried out by light microscopy and the volume fraction of the retained austenite was determined using the X-ray diffraction technique. The results show that quenched and partitioned microstructure contains micro-composite features. Moreover, the amount of retained austenite was reduced by increasing the partitioning time followed by precipitation of carbide phase. The best tensile properties were obtained for the specimen quenched at 170 ° C and partitioned at 300 ° C for 8 minutes with a tensile strength of 1997 MPa, yield strength of 1730 MPa, elongation of 10.3% and reduction area of 48%.

کلیدواژه‌ها [English]

  • Heat treatment
  • quenching and partitioning
  • medium carbon high silicon steel
  • mechanical properties
  • microstructure

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