Next Article in Journal
An Approach to Supporting the Selection of Maintenance Experts in the Context of Industry 4.0
Next Article in Special Issue
A New Plasma Surface Alloying to Improve the Wear Resistance of the Metallic Card Clothing
Previous Article in Journal
Implementation of R&D Results and Industry 4.0 Influenced by Selected Macroeconomic Indicators
Previous Article in Special Issue
Filler Metal Mixing Behaviour of 10 mm Thick Stainless Steel Butt-Joint Welds Produced with Laser-Arc Hybrid and Laser Cold-Wire Processes
Article

Metallurgical Effects of Niobium and Molybdenum on Heat-Affected Zone Toughness in Low-Carbon Steel

1
NiobelCon bvba, 2970 Schilde, Belgium
2
Department of Materials MTM, Leuven University (KU Leuven), 3001 Leuven, Belgium
Appl. Sci. 2019, 9(9), 1847; https://doi.org/10.3390/app9091847
Received: 7 April 2019 / Revised: 29 April 2019 / Accepted: 29 April 2019 / Published: 5 May 2019
(This article belongs to the Special Issue Welding of Steels)
Modern weldable high strength steel grades are typically based on low-carbon alloy concepts using microalloying for obtaining a good strength-toughness balance. Such steel grades having a yield strength in the range of 420 to 690 MPa are very commonly used in pipelines, heavy vehicles, shipbuilding and general structural applications. Thermomechanical processing during hot rolling combined with accelerated cooling is an established means of producing such steel grades. Considering the alloying concepts, the use of niobium and molybdenum, and in selected cases boron, is very efficient to achieve high strength and good toughness. However, all targeted applications of such high strength steels involve extensive welding. Thus, heat affected zone properties are of particular importance. The present paper investigates the effects of Nb, Mo and Ti on the heat affected zone properties. Variations of the Mn and Si contents are considered as well. Additionally, the influence of post-weld heat treatment in the coarse-grained heat-affected zone (HAZ) is considered. In this approach, HAZ subzones were generated using laboratory weld cycle simulations in combination with systematic variation of alloying elements to scrutinize and interpret their specific effects. The results indicate that Mo and Nb, when alloyed in the typical range, provide excellent HAZ toughness and guarantee sufficiently low ductile-to-brittle transition temperature. An alloy combination of Nb, Mo and Ti improves performance under hot deformation conditions and toughness after post-weld heat treatment. View Full-Text
Keywords: welding simulation; heat-affected zone; post-weld heat treatment; high-strength steel; microalloying; solubility; precipitation; solute drag; abnormal grain coarsening; hot ductility welding simulation; heat-affected zone; post-weld heat treatment; high-strength steel; microalloying; solubility; precipitation; solute drag; abnormal grain coarsening; hot ductility
Show Figures

Figure 1

MDPI and ACS Style

Mohrbacher, H. Metallurgical Effects of Niobium and Molybdenum on Heat-Affected Zone Toughness in Low-Carbon Steel. Appl. Sci. 2019, 9, 1847. https://doi.org/10.3390/app9091847

AMA Style

Mohrbacher H. Metallurgical Effects of Niobium and Molybdenum on Heat-Affected Zone Toughness in Low-Carbon Steel. Applied Sciences. 2019; 9(9):1847. https://doi.org/10.3390/app9091847

Chicago/Turabian Style

Mohrbacher, Hardy. 2019. "Metallurgical Effects of Niobium and Molybdenum on Heat-Affected Zone Toughness in Low-Carbon Steel" Appl. Sci. 9, no. 9: 1847. https://doi.org/10.3390/app9091847

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop