In-situ observation of fatigue crack growth behavior of microstructure controlled steel

Mustapa, Mohammad Sukri and M. , Jayaprakash and Y. , Mutoh and T. , Sadasue (2008) In-situ observation of fatigue crack growth behavior of microstructure controlled steel. In: International Conference on Mechanical and Manufacturing Engineering 2008 (ICME 2008), 21-23 Mei 2008, Johor Bahru, Johor, Malaysia.

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Abstract

In the present study, fatigue crack growth (FCG) tests of structural pearlite-ferrite steels with two different ferrite grain sizes of 10μm and 50μm were performed. The results showed that the steel with coarse grained structure with large spacing and size of pearlite particle had a higher threshold value and better FCG resistance in both threshold and Paris regions. To understand clearly the effect of microstructure on FCG behavior, KΔ-constant FCG tests were performed (in Paris region) under a scanning electron microscope (SEM) equipped with a servo-hydraulic testing machine. From the crack path observations it was found that in the steel with coarse grained structure the crack path was more tortuous compared to the fine grained structure. These tortuous crack paths were more pronounced interlocking elements on the crack wake and then increased crack growth resistance.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:in-situ SEM observations; fatigue crack growth; grain size; interlocking
Subjects:T Technology > T Technology (General)
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
ID Code:2240
Deposited By:Normajihan Abd. Rahman
Deposited On:28 Mar 2012 16:12
Last Modified:28 Mar 2012 16:12

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