تاثیر دمای آستمپرینگ دو مرحله‌ای و افزودن عنصر مس بر ریزساختار و خواص مکانیکی چدن ADI
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
مهدی قربانی جمال آبادی
1
,
امیر عابدی
2
,
سروش پرویزی
3
,
مینا صفا
4
,
سالومه مسگری عباسی
5
,
غلامرضا خلج
6
*
1 - گروه مهندسی مواد و متالورژی، دانشکده مهندسی مواد و فناوریهای نوین، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران
2 - گروه مهندسی مواد و متالورژی، دانشکده مهندسی مواد و فناوریهای نوین، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران
3 - گروه مهندسی مواد و متالورژی، دانشکده مهندسی مواد و فناوریهای نوین، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران
4 - گروه فیزیک، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران
5 - گروه مهندسی مواد، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران
6 - گروه مهندسی مواد، واحد ساوه، دانشگاه آزاد اسلامی، ساوه، ایران
کلید واژه: چدن داکتیل آستمپر شده, آسفریت, آستمپرینگ, آستمپرینگ دو مرحله‌ای, استحکام کششی, افزودن مس,
چکیده مقاله :
در این تحقیق تاثیر افزودن مس و دمای آستمپرینگ در حالت دو مرحله‌ای بر ریزساختار، مقدار فازها و خواص مکانیکی چدن ADI مورد بررسی قرار گرفت. ابتدا آلیاژهای بدون محتوای مس و با 5/1 درصد مس ذوب و ریخته‌گری شدند. سپس نمونه‌ها در کوره به دمای °Ϲ900 به مدت min90 آستنیته شدند، پس از آستنیته شدن، تا دمای °Ϲ260 کوئنچ شده و مدت زمان min 5 در این دما نگهداری شدند، سپس به دمای آستمپرینگ (350 و 400 °Ϲ) منتقل شده و مدت زمان min 120 در این دما نگهداری و پس از پایان زمان آستمپرینگ تا دمای محیط در هوا سرد شدند. مشخصه یابی نمونه‌ها با آزمون کشش، سختی، متالوگرافی نوری، SEM و XRD انجام شد. نتایج آزمون‌های استحکام کششی و نتایج سختی سنجی انجام شده بر روی نمونه‌ها بیانگر این است که افزایش دمای آستمپرینگ دو مرحله‌ای باعث کاهش استحکام تسلیم، کششی، ازدیاد طول، سختی و درصد آستنیت می‌شود. با افزایش مس، تمامی خواص نسبت به نمونه بدون مس افزایش می‌یابد.
This study investigated the influence of copper addition and two-step austempering temperature on the microstructure, phase fractions, and mechanical properties of austempered ductile iron (ADI). Two alloys, one without copper and one containing 1.5 wt% copper, were melted and cast. Samples were austenitized at 900°C for 90 minutes, quenched to 260°C, and held for 5 minutes. They were subsequently austempered at either 350°C or 400°C for 120 minutes and then air-cooled to room temperature. Characterization was performed using tensile testing, hardness measurements, optical metallography, scanning electron microscopy (SEM), and X-ray diffraction (XRD). Tensile and hardness test results indicated that increasing the two-step austempering temperature decreased yield strength, ultimate tensile strength, elongation, hardness, and retained austenite content. The addition of copper enhanced all measured mechanical properties compared to the copper-free samples.The addition of copper enhanced all measured mechanical properties compared to the copper-free samples.
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