Softening Kinetics in the Subcritical Heat-Affected Zone of Dual-Phase Steel Welds

Welds in dual-phase (DP) steels exhibit heat-affected zone (HAZ) softening in which the tempered or subcritical HAZ exhibits a lower hardness vs that of the parent material. The rate of this softening reaction with respect to welding heat input was determined for four DP steels by making several bea...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2010-09, Vol.41 (9), p.2348-2356
Main Authors: Biro, E., McDermid, J. R., Embury, J. D., Zhou, Y.
Format: Article
Language:English
Subjects:
Applied sciences
Automobile industry
Characterization and Evaluation of Materials
Chemistry and Materials Science
Decomposition
Exact sciences and technology
Hot rolling
Joining, thermal cutting: metallurgical aspects
Materials Science
Metallic Materials
Metallurgy
Metals. Metallurgy
Microstructure
Nanotechnology
Steel alloys
Structural Materials
Surfaces and Interfaces
Thin Films
Welding
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Summary:Welds in dual-phase (DP) steels exhibit heat-affected zone (HAZ) softening in which the tempered or subcritical HAZ exhibits a lower hardness vs that of the parent material. The rate of this softening reaction with respect to welding heat input was determined for four DP steels by making several bead-on-plate laser welds using a variety of heat inputs and measuring the resulting minimum hardness. The reduction in hardness was then fit to the Avrami equation, enabling a comparison of the relative heat needed to soften each steel. It was found that the heat input required for HAZ softening decreased as the C content of the martensite within the DP structure increased. However, the presence of carbide forming alloying elements such as Cr and Mo was able to increase resistance to softening.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-010-0323-2