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On the analysis of cast structure and its changes during hot working of forging ingots
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Forging ingots are hot worked to consolidate structural imperfections and refine the microstructure. Possible imperfections are segregations, porosities, cracks, and inclusions. In this thesis, techniques and methods for the characterisation of behaviour and properties of ingots and forgings. The root causes for quality issues in open-die forgings are shown to be numerous. Ingot structure in cast tool steel was analyzed, and the main imperfections were centre macrosegregation, and mid radius A-segregations.For overheated steel forgings and low reductions after reheating, a high ultrasonic attenuation and low Charpy-V toughness was found. It could be related to the coarse grain structure found. Only a high forging reduction after reheating will break down the coarse structure. Shorter reheating times and lower forging temperatures gave higher toughness and lower ultrasonic attenuation. Some reduction in toughness was also found from the inclusion field from the bottom of the ingot. Accurate attenuation measurements require a lathe turned surface, complicating in-between-measurements in heat treatment sequences. But on carefully surface prepared forgings, attenuation measurement can be used to determine the success of grain refinement in the heat treatment. A new method for ultrasonic macrography of cast ingot samples is presented. In addition, a new method for hot compression testing of cylindrical metal samples is presented.

Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , 27 p.
Series
Trita-MG. AVH, 2009:01Trita-MG, ISSN 1104-7127
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9774OAI: oai:DiVA.org:kth-9774DiVA: diva2:128039
Public defence
2009-01-16, Sal F3, Lindstedtsvägen 26, KTH,, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20100809Available from: 2008-12-15 Created: 2008-12-11 Last updated: 2010-12-20Bibliographically approved
List of papers
1. Macrosegregation In Ingot Cast Tool Steel
Open this publication in new window or tab >>Macrosegregation In Ingot Cast Tool Steel
2004 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2004. 22 p.
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-7084 (URN)KTH-MG-INR-04:09 SE (ISRN)
Note
QC 20101102Available from: 2007-05-14 Created: 2007-05-14 Last updated: 2010-12-20Bibliographically approved
2. Causes of High Ultrasonic Attenuation and Reduced Mechanical Toughness of a Forged Rotor Shaft
Open this publication in new window or tab >>Causes of High Ultrasonic Attenuation and Reduced Mechanical Toughness of a Forged Rotor Shaft
2005 (English)Report (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 16 p.
Series
Trita-MG, ISSN 1104-7127 ; 2005:04
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9780 (URN)KTH-MG-INR-05:04SE (ISRN)
Note
QC 20100809Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2010-12-20Bibliographically approved
3. Influence of Various Heating and Forging Routes on the Microstructure of 3%Ni-Steels
Open this publication in new window or tab >>Influence of Various Heating and Forging Routes on the Microstructure of 3%Ni-Steels
2003 (English)Conference paper, Published paper (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9785 (URN)
Conference
15th International Forgemasters Meeting, Kobe, Japan, 2003
Note
QC 20100809Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2010-12-20Bibliographically approved
4. The possibility of evaluation of defects and grain structure by ultrasonictechniques in large forgings and test pieces of ingots
Open this publication in new window or tab >>The possibility of evaluation of defects and grain structure by ultrasonictechniques in large forgings and test pieces of ingots
2006 (English)In: 16th International Forgemasters Meeting, Sheffield, United Kingdom, 2006, 2006Conference paper, Published paper (Refereed)
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9786 (URN)
Note
QC 20100809Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2010-08-09Bibliographically approved
5. Ultrasonic Evaluation of Imperfections and Defects in Cast Steel Ingot Samples Using Immersion Tank Testing
Open this publication in new window or tab >>Ultrasonic Evaluation of Imperfections and Defects in Cast Steel Ingot Samples Using Immersion Tank Testing
2009 (English)Report (Other academic)
Publisher
15 p.
Series
Trita-MG, ISSN 1104-7127 ; 2009:01
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9783 (URN)
Note
QC 20100809Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2010-08-09Bibliographically approved
6. Hot Deformation Testing of Cast Metal Samples
Open this publication in new window or tab >>Hot Deformation Testing of Cast Metal Samples
2009 (English)Report (Other academic)
Publisher
19 p.
Series
Trita-MG, ISSN 1104-7127 ; 2009:02
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-9784 (URN)
Note
QC 20100809Available from: 2008-12-16 Created: 2008-12-16 Last updated: 2010-08-09Bibliographically approved

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Citation style
  • apa
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Output format
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