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Effect of hardness of second phase particle on fatigue crack growth behavior of steels with hard second phase particle in soft ferrite matrix

Mustapa, Mohammad Sukri and Yoshiharu, Mutoh (2010) Effect of hardness of second phase particle on fatigue crack growth behavior of steels with hard second phase particle in soft ferrite matrix. Advanced Materials Research, 129. pp. 775-779. ISSN 10226680

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Abstract

ΔK-constant fatigue crack growth (FCG) tests were conducted on low carbon steels with uniformly distributed hard particle with different of pearlite, bainite and martensite in a soft ferrite matrix. The FCG tests by using a single edge cracked tension (SECT) type was performed inside a scanning electron microscope chamber equipped with a servo-hydraulic fatigue machine. During the test, in-situ crack path observation was carried out to identify the crack tip stress shielding phenomena. From the results, influence of hardness of second phase particle on the FCG behavior in Paris regime was systematically investigated. The results revealed that the ferrite-martensite (FM) steel showed significantly higher FCG resistance compared to that of ferrite-pearlite (FP) and ferrite-bainite (FB) steels. The harder second phase particle would be more difficult to be plastically deformed, which would induce higher plastic constrain. This higher plastic constrain may result in significant crack closure effect and stress shielding effect, thereby increasing higher FCG resistance.

Item Type: Article
Uncontrolled Keywords: Fatigue crack growth; hardness; crack closure; crack tip stress shielding; interlocking; plastic constrain deformation
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Mechanical Engineering Technology
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 13 Aug 2018 03:36
Last Modified: 13 Aug 2018 03:36
URI: http://eprints.uthm.edu.my/id/eprint/8961
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