بررسی تأثیر دمای بازپخت بر ریزساختار، سختی و فشار ترکیدن فولاد 34CrMo4

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان، اصفهان 84156-83111، ایران

چکیده

مقدمه و اهداف: فولاد 34CrMo4 به دلیل داشتن محتوای متوسط کربن، امکان افزایش مقاومت خود را از طریق عملیات حرارتی خنک‌کردن و بازپخت دارد. هدف از پژوهش حاضر به‌دست آوردن دمای بهینه بازپخت به‌منظور دست‌یابی به خواص بهینه ساختاری و مکانیکی از جمله سختی و فشار ترکیدن است.
مواد و روش‌ها: در پژوهش حاضر، فولاد 34CrMo4 به‌عنوان ماده اولیه مورداستفاده قرار گرفته است. پس از طی مراحل فرایند ساخت مخزن گاز طبیعی و انجام عملیات حرارتی، به‌منظور بررسی خواص ریزساختاری و مکانیکی مخازن تولیدشده، آزمون‌های سختی‌سنجی، بررسی فشار هیدرولیک، فشار ترکیدن و مطالعات ریزساختاری انجام شد. 
یافته‌ها: نتایج نشان داد که در محدوده دمای بازپخت 505 تا 585 درجه سانتی‌گراد، سختی از 392 تا 310 برینل کاهش یافت و فشار شکست از 620 تا 500 بار کاهش یافت. در مقایسه با استاندارد ملی (ISIRI 7598) نمونه‌های ساخته‌شده در دماهای 505، 525 و 545 درجه سانتی‌گراد، شرایط استاندارد را برآورده نمی‌کنند و دمای عملیات حرارتی بهینه در محدوده 565 تا 585 درجه سانتی‌گراد، برای مخازن گاز طبیعی فشرده است.
نتیجه‌گیری: با افزایش دمای بازپخت، استحکام ماده کاهش‌یافته و با اعمال فشار کمتری ترکیدن اتفاق افتاده است. با افزایش دمای بازپخت سطوح شکست از شکست ترد به سمت شبه‌ترد و شکست نرم پیش خواهد رفت. محدوده دمای بازپختی که خواص مکانیکی بهینه مطابق با استاندارد ملی 7598 حاصل خواهد شد، بین 565-585 درجه سانتی‌‌گراد خواهد بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigating the Effect of Tempering Temperature on the Microstructure, Hardness and Burst Pressure of 34CrMo4 Steel

نویسندگان [English]

  • Ali Zareei
  • Mohammad Mahdi Piran
  • Masoud Atapoor
Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
چکیده [English]

Introduction and Objectives: 34CrMo4 steel has the ability to increase its strength through quenching and annealing heat treatment due to its moderate carbon content. The aim of the present study is to obtain the optimal annealing temperature in order to achieve optimal structural and mechanical properties, including hardness and burst pressure.
Materials and Methods: In the present study, 34CrMo4 steel was used as the starting material. After going through the stages of the natural gas tank construction process and performing heat treatment, hardness testing, hydraulic pressure testing, burst pressure testing, and microstructural studies were performed to investigate the microstructural and mechanical properties of the produced tanks.
Results: The results showed that in the annealing temperature range of 505 to 585°C, the hardness decreased from 392 to 310 Brinell and the breaking pressure decreased from 620 to 500 bar. Compared to the national standard (ISIRI 7598), the samples made at temperatures of 505, 525, and 545°C do not meet the standard conditions and the optimum heat treatment temperature is in the range of 565 to 585°C for compressed natural gas tanks.
Conclusion: With increasing tempering temperature, the strength of the material decreases and bursting occurs with less pressure. With increasing annealing temperature, the fracture surfaces will progress from brittle fracture to quasi-brittle and ductile fracture. The annealing temperature range at which optimal mechanical properties will be achieved in accordance with the National Standard 7598 will be between 565-585°C.

کلیدواژه‌ها [English]

  • 34CrMo4 steel
  • Annealing temperature
  • Pressure vessel
  • Mechanical properties
  • Microstructure

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