The Resource On the spheroidal graphite growth and the austenite solidification in ductile irons, by Jingjing Qing

On the spheroidal graphite growth and the austenite solidification in ductile irons, by Jingjing Qing

Label
On the spheroidal graphite growth and the austenite solidification in ductile irons
Title
On the spheroidal graphite growth and the austenite solidification in ductile irons
Statement of responsibility
by Jingjing Qing
Creator
Author
Subject
Language
eng
Summary
"Evolutions of austenite and nodular/spheroidal graphite particles during solidifications of ductile irons were experimentally investigated. Spheroidal graphite particle and austenite dendrite were found nucleated independently in liquid. Austenite dendrite engulfed the spheroidal graphite particles after contact and an austenite shell formed around a spheroidal graphite particle. The graphite diameter at which the austenite shell closed around nodule was determined. Statistically determined graphite size distributions indicated multiple graphite nucleation events during solidification. Structures in a graphite nodule varied depending on the growth stages of the nodule in ductile iron. Curved graphene layers appearing as faceted growth ledges swept circumferentially around the surface of a graphite nodule at early growth stages. Mismatches between the growth fronts created gaps which divided a nodule into radially oriented conical substructures (3-D). Columnar substructure was observed in the periphery of a nodule (formed during the intermediate growth stages) on its 2-D cross section. A columnar substructure consisted of parallel peripheral grains, with their c-axes approximately parallel. Graphene layers continued building up in individual conical substructure, and a graphite nodule increased its size accordingly. Method for characterizing the crystal structures of graphite based on the selected area diffraction pattern was developed. Both hexagonal structure and rhombohedral structure were found in the spheroidal graphite particles. Possible crystallographic defects associated with hexagonal-rhombohedral structure transition were discussed. Schematic models for introducing tilt angles to the graphite lattice with basal plane tilt boundaries were constructed"--Abstract, page iv
Related
Member of
Cataloging source
UMR
http://library.link/vocab/creatorName
Qing, Jingjing
Degree
Ph. D.
Dissertation year
2016
Granting institution
Missouri University of Science and Technology
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • dictionaries
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Austenite
  • Iron alloys
  • Ductile iron
Label
On the spheroidal graphite growth and the austenite solidification in ductile irons, by Jingjing Qing
Instantiates
Publication
Note
  • Vita
  • This dissertation contains four papers for publication
Bibliography note
Includes bibliographic references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
952598731
Extent
1 online resource (xii, 140 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)952598731
Label
On the spheroidal graphite growth and the austenite solidification in ductile irons, by Jingjing Qing
Publication
Note
  • Vita
  • This dissertation contains four papers for publication
Bibliography note
Includes bibliographic references
Carrier category
online resource
Carrier category code
  • cr
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
952598731
Extent
1 online resource (xii, 140 pages)
Form of item
online
Governing access note
These materials are protected under copyright by the original author
Media category
computer
Media MARC source
rdamedia
Media type code
  • c
Other physical details
illustrations (most colored).
Specific material designation
remote
System control number
(OCoLC)952598731

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