Volume 25, Issue 1 (January 2024)
Modares Mechanical Engineering 2024, 25(1): 43-54 |
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Ghasemi Mobarakeh H, Rahnama S, Abedini R, Masoudi Nejad R. Experimental Investigation of Very High Cycle Fatigue in DP1000 Steel. Modares Mechanical Engineering 2024; 25 (1) :43-54
URL: http://mme.modares.ac.ir/article-15-78393-en.html
URL: http://mme.modares.ac.ir/article-15-78393-en.html
1- University of Birjand
2- Department of Mechanics, Faculty of Engineering, University of Birjand ,srahnama@birjand.ac.ir
3- Iran University of Science and Technology
4- Faculty of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an-China
2- Department of Mechanics, Faculty of Engineering, University of Birjand ,
3- Iran University of Science and Technology
4- Faculty of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an-China
Abstract: (146 Views)
This study investigated damage initiation in the microstructure of DP1000 dual-phase steel under ultrasonic very high cycle fatigue (VHCF) conditions. The microstructure of this steel consists of ferrite and martensite phases, a combination of which provides outstanding mechanical properties such as high strength and fatigue resistance. In this study, a precise heat treatment method was employed to optimize the steels microstructure, resulting in a uniform distribution of 50% soft ferrite and 50% hard martensite. Additionally, the design of hourglass-shaped specimens for ultrasonic fatigue testing (20 kHz) and the implementation of a novel combined cooling system enabled stable temperature control during testing. This temperature control method allowed very high cycle fatigue testing to be conducted for the first time without the influence of thermal stresses, yielding results with greater accuracy and reliability compared to previous research. During the test, the displacement of the specimens free end was measured using a laser sensor and the S-N diagram was constructed. The results demonstrated that the optimized microstructure delayed damage initiation and reduced the crack growth rate, whereas an improper phase’s distribution accelerated crack growth
Article Type: Original Research |
Subject:
Damage Mechanics
Received: 2024/12/9 | Accepted: 2025/03/3 | Published: 2024/12/30
Received: 2024/12/9 | Accepted: 2025/03/3 | Published: 2024/12/30
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