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Microstructural composition and Mechanical properties in CGI Cast component: Industrial grade Compression-ignition Engine Block
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. (Lean Cast)
2021 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Sustainable development
Sustainable Development
Abstract [en]

The purpose of this master thesis is to assess primary austenite morphology in an industrially produced cast component in compacted graphite iron. Two locations in the cylinder block are of interest to establish microstructural relation to the acquired mechanical properties. This has been done to understand the significance of austenitic dendrite's role in materials strength.

The investigation included analysis of constituent phases – graphite, ferrite, pearlite content through image analysis and measured hardness and tensile strength. Optical microscopy was used to acquire microstructural features and the image analysis was carried out by the software Olympus stream motion. Micro-hardness of the pearlite phase by Vickers hardness was measured in accordance to [ISO 6507-1:2005]. The macro hardness (Brinell hardness) and uniaxial tensile strength measurements were provided by the company, and were done in accordance to [ISO 6506-1:2014HBW 2.5/187.5] and [SS-EN ISO 6892-1:2009] respectively.

A possible relation between primary austenitic dendrite morphology and ultimate tensile stress is prevalent. Implementation of the novel parameter to quantify dendrite morphology was done; Hydraulic diameter of the Inter-dendritic phase (DIPHyd) and Geometric modulus of dendrites (Mpd). The difficulty in quantifying secondary population in the cast is emphasised.

Place, publisher, year, edition, pages
2021. , p. 58
Keywords [en]
Cast iron, Compacted graphite iron, CGI, Cylinder block, Microstructure, Hydraulic Diameter of Dendrites, Pearlite microhardness, Secondary population
National Category
Metallurgy and Metallic Materials Vehicle Engineering
Identifiers
URN: urn:nbn:se:hj:diva-51973ISRN: JU-JTH-PRU-2-20210237OAI: oai:DiVA.org:hj-51973DiVA, id: diva2:1532429
External cooperation
Scania AB
Subject / course
JTH, Product Development
Presentation
2021-02-25, South conference room, Department of Materials and Manufacturing, JTH, Jönköping, 11:00 (English)
Supervisors
Examiners
Available from: 2021-03-03 Created: 2021-03-01 Last updated: 2021-03-03Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
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  • nn-NO
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  • asciidoc
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