Evaluation of environmentally assisted fracture of austempered ductile iron (ADI) under cyclic load bearing

Evaluation of environmentally assisted fracture of austempered ductile iron (ADI) under cyclic load bearing

This paper aims to characterize the behaviour of austempered ductile iron (ADI) under cyclic load bearing and its surface in contact with water. The first part is devoted to verifying the drop in Ultimate tensile strength and the elongation that takes place when ADI tensile samples are tested submer...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures Vol. 39; no. 3; pp. 346 - 356
Main Authors: Fernandez Scudeller, F, Martinez, R A
Format: Journal Article
Language:English
Published: Oxford Blackwell Publishing Ltd 01-03-2016
Wiley Subscription Services, Inc
Subjects:
ADI
Alloys
Crack initiation
cracks
cyclic load
Cyclic loads
embrittlement
Fatigue (materials)
Fatigue failure
Fracture mechanics
Fracture surfaces
Fracturing
Nodular iron
water
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Summary:This paper aims to characterize the behaviour of austempered ductile iron (ADI) under cyclic load bearing and its surface in contact with water. The first part is devoted to verifying the drop in Ultimate tensile strength and the elongation that takes place when ADI tensile samples are tested submerged in water as compared to values obtained in dry condition. Focus of this work is placed on crack initiation and propagation when submerged SEN(B) samples are tested applying cyclic loads. Different test stages of fissure nucleation and propagation on the lateral face of the sample were documented by microscopic imaging during the test, thereby allowing to characterize the manner in which failure occurred. The resulting fracture surfaces were analysed by scanning electron microscopy (SEM), and possible fracture mechanisms are discussed. The main contributions of this work include characteristic values of the time of crack initiation, crack growth rate and a methodology to study some particularities of the operating fracture mechanisms based on lateral observations and fracture surface images.
Bibliography:ArticleID:FFE12360
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istex:FF7B14167E79429367948447B3DE60DD6AD892CF
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.12360