تأثیر فرایند کوئنچ و پارتیشن‌بندی بر ساختار و خواص مکانیکی فولاد AISI 4130

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی مالک ‌اشتر، ایران

چکیده

در پژوهش حاضر تأثیر عملیات حرارتی کوئنچ و پارتیشن‌بندی بر ریزساختار و خواص مکانیکی فولاد AISI 4130 مورد بررسی قرار گرفته است. فرایند مورد بحث در دمای کوئنچ 270 درجه سانتی‌گراد و سه دمای پارتیشن‌بندی 270، 330 و 380 درجه سانتی‌گراد دنبال شد. مشخصه‌یابی ساختار فازی نمونه‌های حاصل توسط آزمون‌های پراش‌سنج پرتو ایکس و میکروسکوپی الکترونی روبشی انجام شد. خواص مکانیکی نمونه‌ها نیز توسط آزمون سختی‌سنجی و آزمون کشش طبق استاندارد  ASTM E8 دنبال شد. نتایج حاصل نشان داد که با انجام فرایند کوئنچ و پارتیشن‌بندی در فولاد AISI 4130 با حفظ درصد ازدیاد طول (در حدود 9/6 درصد)، استحکام کششی تا حدود 1450 مگاپاسکال قابل افزایش است. این مقدار افزایش، در حدود 20 درصد بیشتر از استحکام حاصل از فرایند معمول کوئنچ و تمپر در مورد این فولاد است. شرایط بهینه عملیات کوئنچ و پارتیشن‌بندی، دمای پارتیشن‌بندی 330 درجه سانتی‌گراد و زمان 120 دقیقه تعیین شد. انجام پارتیشن‌بندی در دماهای پایین‌تر قادر به پایدارسازی فاز آستنیت نبوده، پارتیشن‌بندی در دماهای بالاتر تجزیه آستنیت و رسوب کاربید را به دنبال دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Quenching and Partitioning (Q&P) Process on the Structural and Mechanical Properties of AISI 4130 Steel

نویسندگان [English]

  • S. Hossain Reza
  • M. Tavoosi
  • M.R. Dehnavi
Department of Materials Engineering, Malek- Ashtar University of Technology, Shahin-Shahr, Isfahan, Iran
چکیده [English]

In this study, the effect of quenching and partitioning (Q&P) heat treatment on the structural and mechanical properties of AISI 4130 steel was investigated. The Q&P process was followed at a quench temperature of 270 oC and three different partitioning temperatures of 270, 330, and 380 oC. The phase and structural characterization of the prepared spicimens were done using X-ray diffractometer (XRD) and scanning electron microscopy (SEM), respectively. The mechanical properties of the samples were also monitored by hardness and tensile test according to ASTM E8 standard. The results showed that the tensile strength can be increased up to 1450 MPa while maintaining the elongation percentage (about 9.6%) by performing the Q&P process on the AISI 4130 steel. This strength is about 20% greater than that of obtained by the usual quench and tempering process in this steel. Optimum partitioning temperature and time for AISI 4130 steel were determined to be 330 °C and 120 minutes, respectivly. Partitioning at lower temperatures could not stabilize the austenite phase, while partitioning at higher temperatures caused the decomposition of the austenite phase and carbide precipitation.

کلیدواژه‌ها [English]

  • Quenching and partitioning
  • AISI 4130 steel
  • Mechanical properties
  • Microtructure
  • Austenite
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