بررسی تأثیر استحاله آستنیت باقیمانده به مارتنزیت بر رفتار سایشی چدن‌های سفید

نوع مقاله : علمی و پژوهشی

نویسندگان

1 دانشگاه یزد

2 یزد

3 ِیزد

چکیده

در این پژوهش، تاثیر استحاله آستنیت باقیمانده به مارتنزیت بر رفتار سایشی چدن‌های سفید بررسی شده است. برای این منظور، رفتار سایشی یک نوع چدن سفید ‌آلیاژی با ریزساختار آستنیتی-کاربیدی در مقایسه با چدن سفید معمولی با ریزساختار پرلیتی-کاربیدی مورد بررسی قرار گرفت. تست سایش با استفاده از روش پین روی دیسک در بار‌گذاری‌های 80، 100، 120 و140 نیوتن انجام شد. نتایج نشان می‌دهد که در بارگذاری‌های کمتر از 100 نیوتن در نمونه‌های چدن سفید آلیاژی، آستنیت باقیمانده پایدار بوده و در طی آزمون سایش در اثر تنش‌ها و نیروهای مکانیکی پدیده کار سخت شدن آستنیت باقیمانده اتفاق افتاده است ولی در بارگذاری‌های بیش از 100 نیوتن آستنیت باقیمانده به مارتنزیت تحول یافته است که باعث افزایش شدیدی در مقاومت به سایش چدن سفید آلیاژی شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of Retained Austenite to Martensite Phase Transformation on Wear Behavior of White Cast Irons

نویسندگان [English]

  • Vahid Karami Dastenaee 1
  • seyedsadegh ghasemi bnad koki 2
  • masoud mosallaeepoor 2
  • alireza mashreghi 3
1 yazd university
2 yazd University
3 yazd
چکیده [English]

In this study, the effect of retained austenite to martensite phase transformation has been studied in conjunction with wear behavior of white cast irons. For this purpose, the wear behavior of an alloyed white cast iron with a carbide-austenite microstructure has been studied in comparison to that of conventional white cast iron with a pearlite-carbide microstructure. The wear tests were conducted by using pin on disk test method with loads of 80, 100, 120 and 140N. The results show that retained austenite is stable and also work hardened during wear test conducted with loads less than 100N in alloyed white cast iron samples, while, the retained austenite transformed to martensite after using loads greater than 100N. The retained austenite to martensite phase transformation has been associated with significant improvement in wear resistance in the alloyed white cast iron.

کلیدواژه‌ها [English]

  • white cast iron
  • carbide
  • pearlite
  • martensite
  • retained austenite
  • wear behavior

مراجع

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