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Surface and Inner Deformation during Shape Rolling of High Speed Steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Shape rolling is a common manufacturing process used to produce long products i.e. bars and wire. One of the problems that might occur during rolling is defect formation leading to rejection of the finished product. This work is a step towards a better understanding of the evolution of some of these defects.

The evolution and reduction of cracks during shape rolling is studied in this thesis. To accomplish this, artificial longitudinal cracks are machined along bars of high speed steel. The cracks are positioned at different sites evenly distributed along the periphery in intervals of 45°. Some of the cracks are left open and some are filled with carbon or stainless steel welds. FE simulations are performed using the commercial code MSC.Marc and the results from the simulations are compared with experimental ones. Generally, simulations predict less reduction than observed experimentally. For most positions, the cracks tend to reduce most effectively followed by carbon steel welds and stainless steel welds.

To evaluate the inner deformation of a cross section during shape rolling in an oval-round-oval-round series, sample bars of M2 high speed steel are prepared with grids made up by stainless steel wires. After collecting samples after each pass, they are X-rayed to create an image of the grid. The deformation of the wires can favorably be described by FE simulations of a bar originally rotated 10° when entering the first pass. The results suggest that the simulations describe the deformation during shape rolling well.

Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , x, 14 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-4460ISBN: 978-91-7178-649-4 (print)OAI: oai:DiVA.org:kth-4460DiVA: diva2:12375
Presentation
2007-05-15, K 408, KTH, Brinellvägen 23, Stockholm, 11:00
Opponent
Supervisors
Note
QC 20101115Available from: 2007-07-10 Created: 2007-07-10 Last updated: 2010-11-15Bibliographically approved
List of papers
1. A study of surface deformation during wire-rod rolling of high speed steels using experimental and computational techniques
Open this publication in new window or tab >>A study of surface deformation during wire-rod rolling of high speed steels using experimental and computational techniques
2007 (English)In: Steel Research International, ISSN 1611-3683, Vol. 78, no 12, 876-883 p.Article in journal (Refereed) Published
Abstract [en]

The evolution of surface defects during shape rolling of high-speed steel billets is studied using longitudinal surface defects prepared by machining and welding. The reduction of the defects during rolling in a production mill is compared to the total area reduction of the billets. Samples are collected after pass 4, 6, 8, 14, 19 and the final pass, 28, representing the finished 5.5mm wire. By inspecting the cross sections, the rotation of the billets from pass to pass is evaluated. Results from FE simulations on solid billets are compared to the experimental results. Generally, simulations predict less reduction than observed experimentally. In most cases cracks reduce most effectively followed by carbon steel welds and stainless steel welds.

Keyword
FEM; wire-rod rolling; shape rolling; high speed steel; artificial cracks; surface layer deformation
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:kth:diva-7368 (URN)000252709300005 ()2-s2.0-38049097618 (Scopus ID)
Note
QC 20100825 Uppdaterad från accepted till published (20100825)Available from: 2007-07-10 Created: 2007-07-10 Last updated: 2010-11-15Bibliographically approved
2. Experimental and numerical study of inner deformation during shape rolling of an M2 high speed steel
Open this publication in new window or tab >>Experimental and numerical study of inner deformation during shape rolling of an M2 high speed steel
(English)Article in journal (Other academic) Submitted
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-7369 (URN)
Note
QS 20120328Available from: 2007-07-10 Created: 2007-07-10 Last updated: 2012-03-28Bibliographically approved

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