Tempering Kinetics of the Martensitic Phase in DP Steel

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概要

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• The increase in the yield stress of dual phase (DP) steels, resulting from the static strain ageing phenomenon, commonly referred to as bake hardening (BH), gives an important contribution to the additional in-service strength of outer auto body parts, e.g. with respect to the dent resistance of the components made with DP steel. In order to understand this large BH effect, the role of the different constituents of the DP steel during this process needs to be considered. The various stages of tempering phenomena taking place in the martensite phase were investigated in detail by means of precision dilatometry and X-Ray Diffraction (XRD). The succession of the various tempering reactions that are characterised by typical volume changes was determined using both constant heating rate and isothermal dilatometric tests. The measurements made it possible to distinguish five distinct stages of structural changes during tempering: (I) the redistribution of carbon atoms, (II) the precipitation of η- or ε-carbide, (III) the formation of Häg-carbide, (IV) the decomposition of retained austenite, and (V) the transformation of transition carbides to cementite.

• 社団法人 日本鉄鋼協会の論文
• 2006-01-15

著者

• De Cooman

  Laboratory For Iron And Steelmaking University Of Ghent Ocas Nv Research Centre Of Sidmar Arbed Grou

• De Cooman

  Laboratory For Iron And Steelmaking Department Of Metallurgy And Materials Science Ghent University

• WATERSCHOOT T.

  Laboratory for Iron and Steelmaking, Department of Metallurgy and Materials Science, Ghent Universit

• VERBEKEN K.

  Fund for Scientific Research-Flanders (Belgium) (F.W.O.-Vlaanderen)

• Waterschoot T.

  Laboratory For Iron And Steelmaking Department Of Metallurgy And Materials Science Ghent University

関連論文

• The Influence of the Substitution of Si by Al on the Properties of Cold Rolled C-Mn-Si TRIP Steels
• Tempering Kinetics of the Martensitic Phase in DP Steel
• Kinetics of Phase Transformation in Steels: A New Method for Analysing Dilatometric Results

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