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On the fatigue damage micromechanisms in Si-solution-strengthened spheroidal graphite cast iron
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore.
Department of Mechanical Engineering, Tokyo Institute of Technology, Tokyo, Japan.
Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.ORCID-id: 0000-0002-5635-8023
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2018 (Engelska)Ingår i: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 41, nr 3, s. 625-641Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Graphite nodules in spheroidal graphite cast iron (SGI) play a vital role in fatigue crack initiation and propagation. Graphite nodules growth morphology can go through transitions to form degenerated graphite elements other than spheroidal graphite nodules in SGI microstructure. These graphite particles significantly influence damage micromechanisms in SGI and could act differently than spheroidal graphite nodules. Most of the damage mechanism studies on SGI focused on the role of spheroidal graphite nodules on the stable crack propagation region. The role of degenerated graphite elements on SGI damage mechanisms has not been frequently studied. In this work, fatigue crack initiation and propagation tests were conducted on EN-GJS-500-14 and observed under scanning electron microscope to understand the damage mechanisms for different graphite shapes. Crack initiation tests showed a dominant influence of degenerated graphite elements where early cracks initiated in the microstructure. Most of the spheroidal graphite nodules were unaffected at the early crack initiation stage, but few of them showed decohesion from the ferrite matrix and internal cracking. In the crack propagation region, graphite/ferrite matrix decohesion was the frequent damage mechanism observed with noticeable crack branching around graphite nodules and the crack passing through degenerated graphite elements. Finally, graphite nodules after decohesion acted like voids which grew and coalesced to form microcracks eventually causing rapid fracture of the remaining section.

Ort, förlag, år, upplaga, sidor
John Wiley & Sons, 2018. Vol. 41, nr 3, s. 625-641
Nyckelord [en]
damage micromechanisms; fatigue crack initiation; fatigue crack propagation; spheroidal graphite cast iron
Nationell ämneskategori
Metallurgi och metalliska material
Identifikatorer
URN: urn:nbn:se:hj:diva-38947DOI: 10.1111/ffe.12723ISI: 000425083000008Scopus ID: 2-s2.0-85042101852Lokalt ID: JTHMaterialISOAI: oai:DiVA.org:hj-38947DiVA, id: diva2:1187218
Tillgänglig från: 2018-03-02 Skapad: 2018-03-02 Senast uppdaterad: 2019-02-14Bibliografiskt granskad

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Kasvayee, Keivan AmiriGhassemali, EhsanJarfors, Anders E.W.

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