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Effect of different inclusions on mechanical properties and machinability of 20NiCrMo carburizing steels
RISE, Swerea, KIMAB. KTH Royal Institute of Technology, Sweden.
RISE, Swerea, KIMAB.
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
2015 (English)In: Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015, Chinese Society for Metals , 2015, p. 805-808Conference paper, Published paper (Refereed)
Abstract [en]

In modern steelmaking, carburizing steels are often used for production of automotive components with elevated levels of toughness and fatigue strength. This study is focused on the link between the characteristics of non-metallic inclusions in the steel and the machinability of the given steel grades. For this purpose, inclusion characteristics (such as composition, number, size, morphology etc.) in steel samples were determined by common two-dimensional (2D) observations of inclusions on polished metal surface of samples as well as by three-dimensional (3D) investigations of inclusions after electrolytic extraction from steel samples. The inclusion characteristics were investigated in the three types of 20NiCrMo carburizing steel grades: Steel A - reference steel (410ppm S) having a common level of mechanical properties and machinability, Steel B - steel grade (having 340ppm S) with an improved machinability due to the Ca-treatment and modification of MnS inclusions and Steel C - clean steel grade (40ppm S) having a small amount of inclusions and a higher fatigue strength. It was found that the number of inclusions in Steel B is smaller than that in Steel A and that the inclusion composition is different. At the same time, the estimated machinability (tool life) of the Ca-treated steel was superior to that of the reference steel. However, the significant decrease of the number of inclusions in the clean steel (Steel C) resulted in a lower machinability in comparison to the reference steel grade.

Place, publisher, year, edition, pages
Chinese Society for Metals , 2015. p. 805-808
Keywords [en]
Carburizing steel, Machining, Non-metallic inclusions, PCBN cutting tool, Calcium, Extraction, Mechanical properties, Steelmaking, Electrolytic extraction, Inclusion characteristics, Inclusion composition, PCBN cutting tools, Threedimensional (3-d), Two Dimensional (2 D), Cutting tools
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42221Scopus ID: 2-s2.0-84983137878OAI: oai:DiVA.org:ri-42221DiVA, id: diva2:1379680
Conference
6th International Congress on the Science and Technology of Steelmaking, ICS 2015, 12 May 2015 through 14 May 2015
Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2019-12-17Bibliographically approved

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