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Microstructure evolution in an austenitic stainless steel during wire rolling
Dalarna University, 791 88 Falun, Sweden.
2013 (English)In: 5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013, Trans Tech Publications, 2013, Vol. 753, p. 407-410Conference paper, Published paper (Refereed)
Abstract [en]

Material characterization is of great importance for example to improve and further develop physically based models for predicting the microstructural evolution in steels during and after hot deformation. The aim of this study was to characterize the microstructure evolution during wire rod rolling of an austenitic stainless steel of type AISI 304L in a wire rod block, consisting of eight pairs of rolls, using electron backscatter diffraction. The investigation showed that the grain size in the center of the bar decreases during the first four passes. The grain size decrease from 6.5 μm after the first roll pass down to 2 μm, and only small changes was measured in the overall grain size during the last four passes. The subgrain size adopts an almost constant size of 0.9 μm from the second until the fifth roll pass. During the first 3 passes almost no recrystallization is observed and strain accumulates. Partial recrystallization then starts and for the last 3 passes the recrystallization is almost complete and the texture is nearly random.

Place, publisher, year, edition, pages
Trans Tech Publications, 2013. Vol. 753, p. 407-410
Series
Materials Science Forum, ISSN 02555476 ; 753
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227659DOI: 10.4028/www.scientific.net/MSF.753.407ISI: 000320677500086Scopus ID: 2-s2.0-84876516853ISBN: 9783037856888 (print)OAI: oai:DiVA.org:kth-227659DiVA, id: diva2:1205020
Conference
5th International Conference on Recrystallization and Grain Growth, ReX and GG 2013, Sydney, NSW, Australia, 5 May 2013 through 10 May 2013
Note

QC 20180514

Available from: 2018-05-09 Created: 2018-05-09 Last updated: 2018-05-14Bibliographically approved
In thesis
1. Experimental Studies of Deformation Structures in Stainless Steels using EBSD
Open this publication in new window or tab >>Experimental Studies of Deformation Structures in Stainless Steels using EBSD
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, the focus has been the study of deformation structures in stainless steels by using electron backscatter diffraction (EBSD). Via increased knowledge of the evolution of the substructure during deformation, the design and control of the manufacturing process can be improved.

A relation was found between the active deformation mechanisms, the evolution of low angle boundaries (LABs) and the strain hardening rate. When deformation twinning was an active deformation mechanism in an austenitic stainless steel with lower stacking fault energy (SFE), the strain hardening rate was maintained up to large strains due to formation of LABs. The deformation twin boundaries acted as new obstacles for dislocation slip which in turn increased the formation of LABs even further. During deformation by slip in an austenitic stainless steel with a higher SFE, the strain hardening rate instead decreased when LABs were formed. A high value of SFE promotes dislocation cross slip which in turn increases annihilation of dislocations leading to a minor increase in LAB formation.

Deformation structures formed in surface grains during in situ tensile tests were found to develop at lower strains than in bulk grains obtained from interrupted conventional tensile tests. This behavior is consistent with the fact that dislocations sources and deformation twinning operate at approximately half the stress on a free surface as compared to the bulk.

The deformation structures were quantified by measuring size distributions for entities bounded by LABs and high angle boundaries (HABs). The size distributions were found to be well described by bimodal lognormal distribution functions. The average size for the distribution of small grains and subgrains correlated well with the mean free distance of dislocation slip and to the strain hardening.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 63
Series
TRITA-ITM-AVL ; 2018:24
Keywords
EBSD, Austenitic stainless steels, Duplex stainless steel, In situ tensile test, Grain boundaries, Grain rotation, Grain size distribution, Texture, Strain hardening, Structure-property relationship, High strain rate, Wire rod rolling, Roll forming
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-227663 (URN)978-91-7729-772-7 (ISBN)
Public defence
2018-06-05, B2, Brinellvägen 23, Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Note

QC 20180514

Available from: 2018-05-14 Created: 2018-05-09 Last updated: 2018-05-14Bibliographically approved

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