Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Investigating Factors Affecting Fatigue Strength of Spring Steels

Document Type : Research Review Article

Authors
َ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.
10.30501/jamt.2025.474640.1306
Abstract
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.
Keywords
Spring Steel
Fatigue
Physical Properties
Mechanical Properties
Heat Treatment

Subjects

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Journal of Advanced Materials and Technologies
Volume 14, Issue 1
Spring 2025
Pages 1-27

  • Receive Date 01 September 2024
  • Revise Date 01 January 2025
  • Accept Date 06 April 2025