مواد و فناوری‌های پیشرفته

مواد و فناوری‌های پیشرفته

بررسی عوامل مؤثر بر استحکام خستگی فولادهای فنر

نوع مقاله : مقاله مروری پژوهشی

نویسندگان
1 دانشجوی دکتری، گروه مهندسی مواد و متالورژی، دانشگاه یزد، یزد، ایران
2 دانشیار، دانشکده‌ی معدن و متالورژی، گروه مهندسی مواد و متالورژی، دانشگاه یزد، یزد، ایران
3 استاد، دانشکده‌ی معدن و متالورژی، گروه مهندسی مواد و متالورژی، دانشگاه یزد، یزد، ایران
چکیده
این پژوهش در خصوص جایگاه و چگونگی بهبود استحکام خستگی فولاد فنر است. در این ‌خصوص، روش‌های اساسی و نوین شامل کاهش سایز آخال‌ها، ریزدانگی، کاهش عمق دکربوره در فرایند تولید، افزایش کیفیت سطحی و ریزساختار مطلوب مهندسی ناشی از عملیات حرارتی بررسی و مقایسه می‌شوند. درباره‌ی استحکام خستگی فولاد فنر در صنعت، به‌ویژه از ریزساختار مارتنزیت تمپرشده یا بینیت پایینی استفاده می‌شود. نتایج آزمایشی نشان می‌دهد که چندفازی شدن فولاد فنر از ریزساختارهای مارتنزیت تمپرشده، بینیت ریز و آستنیت باقی‌مانده در روش‌های عملیات حرارتی Q&P و Q&B یا ترکیبی از این دو روش بهترین ریزساختار میکروآلیاژی برای فولاد فنر را به ارمغان خواهد آورد. روش‌های ارزیابی مورد توجه عبارت هستند از ریزساختارهای گوناگون ناشی از عملیات حرارتی و کاهش سایز آخال‌های غیرفلزی در فولاد که به بیشترین حد استحکام خستگی منجر می‌شوند. نتایج پژوهشی حکایت از آن است که، در صورت تمیز بودن فولاد، ریزساختار نقش غالب در افزایش عمر خستگی خواهد داشت.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Investigating Factors Affecting Fatigue Strength of Spring Steels

نویسندگان English

َAli Maleki 1
Seyed Sadegh Ghasemi 2
Ali Reza Mashreghi 3
1 PhD Candidate of Material & Metallurgy Engineering, University of Yazd, Yazd, Iran.
2 Associate Professor, Faculty of Materials Engineering and Metallurgy, University of Yazd, Yazd, Iran.
3 Professor, Faculty of Materials Engineering and Metallurgy, University of Yazd, Yazd, Iran.
چکیده English

This article deals with the impact and how to improve the fatigue strength of spring steel. In this regard, the basic and modern methods that include reducing the size of inclusions, decrease grain size, reducing the depth of decarburization, increasing the surface quality and desirable microstructure due to heat treatment are investigated and compared. In relation to the fatigue strength of spring steel, the microstructure of tempered martensite or fine bainite is used in the industry. The experimental results show that the multi-phasing of spring steel from the microstructures of tempered martensite, fine bainite and retained austenite in Q&P and Q&B heat treatment methods or a combination of these two methods will bring the best micro-alloy microstructure for spring steel. The concerned evaluation methods were: different microstructures caused by heat treatment and reducing the size of non-metallic inclusions in steel. The experimental results show that if the steel is clean (free of inclusion), the microstructure would play a dominant role in increasing the fatigue life.

کلیدواژه‌ها English

Spring Steel
Fatigue
Physical Properties
Mechanical Properties
Heat Treatment
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دوره 14، شماره 1
بهار 1404
صفحه 1-27

  • تاریخ دریافت 11 شهریور 1403
  • تاریخ بازنگری 12 دی 1403
  • تاریخ پذیرش 17 فروردین 1404