Influence of alloying elements on the mechanical properties of high-strength weld metal

Schnitzer, Ronald; Zügner, Dominik; Haslberger, Phillip; Ernst, Wolfgang; Kozeschnik, Ernst

doi:10.1080/13621718.2016.1274095

Cited by 18 publications

(23 citation statements)

References 17 publications

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“…The tensile tests showed that the combined addition of Ti, Nb, and Al resulted in a significant strength increase compared to the reference sample (Table 3), which was already shown in [8]. By adding V in a comparatively high amount (0.2 m.%), the strength could be improved further.…”

Section: Alloy Groupmentioning

confidence: 52%

“…Currently, experiments are running with the goal of developing a filler material with a yield strength of 1100 MPa. Several alloying systems were used in previous studies, leading to promising results regarding both strength and toughness [8,9]. In these studies, high-resolution imaging methods were applied to analyze the microstructure of the welds [9].…”

Section: Introductionmentioning

confidence: 99%

“…In these studies, high-resolution imaging methods were applied to analyze the microstructure of the welds [9]. It was shown that microalloying can serve as an alternative concept for welds regarding strengthening [8]. A combination of Ti, Nb, and Al increased the strength of the welds effectively, as was predicted by thermodynamic and kinetic simulations.…”

Section: Introductionmentioning

confidence: 99%

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Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

et al. 2018

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Gas metal arc welding with metal-cored filler wires is frequently used to weld high strength steel constructions for lightweight and transportation applications. In the current study, microalloying is considered as strengthening concept for reaching the required mechanical properties by precipitation hardening. For this purpose, the typical microalloying elements Ti, Nb, V, and Al were added to the filler metal in a comparatively high amount (up to 0.5 m.%). All-weld metal samples with a yield strength of 1000 MPa and more were produced by gas metal arc welding. Laser-pulsed atom probe tomography was used to evaluate the potential of these elements to form clusters or precipitates and strengthen the weld metal. While Al and Nb did not form clusters, a strong tendency for clustering was found for V-and Ti-alloyed samples. The cluster size evolution and changes in chemical composition depending on the microalloying contents are discussed. Furthermore, the challenges arising from local alloying element enrichments and local differences in thermal history in the all-weld metal are addressed regarding sample preparation and data evaluation.

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Section: Alloy Groupmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

et al. 2018

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“…During this short time small clusters can form, if the vanadium concentration is high enough to guarantee a high clustering potential. Compared to other microalloying elements (Ti, Nb, Al), which were also tried in previous studies [4], vanadium showed the highest strengthening potential and was therefore chosen for this new generation of welding consumables. APT revealed small ironrich vanadium carbonitride clusters in alloy D (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, an approach was made to add microalloying elements to a metal-cored wire to strengthen the weld metal [4]. This approach showed promising results, and the outcomes of further experiments with vanadium alloying are discussed elsewhere [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of high-strength steel welding consumables with a minimum yield strength of 1100 MPa

et al. 2018

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Welded high-strength steel components have great potential for use in lightweight constructions or highly loaded structures. Welding of steels with a yield strength of more than 1100 MPa is particularly challenging because of the toughness requirements for the weld metal. Currently, a new generation of welding consumables with a minimum yield strength of 1100 MPa has been developed. Based on electron backscatter diffraction and atom probe tomography, a concept for toughening and strengthening of all-weld metal samples was deployed. Starting from a martensitic all-weld metal sample with an approximate yield strength of 1000 MPa, a reduction in manganese and silicon content resulted in a refined microstructure with a lower prior austenite grain size and effective grain size. Furthermore, a higher average grain boundary misorientation was measured, which influences the toughness positively. An addition of vanadium caused the formation of vanadium-rich clusters, which increased the strength of the all-weld metal significantly. With a combination of these two mechanisms, it was possible to produce an all-weld metal sample with the required yield strength of more than 1100 MPa and an acceptable toughness.

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Microstructural Analysis of the Recrystallization Behavior of Low Alloyed Steels

Esterl

Sonnleitner

Schnitzer

2019

steel research int.

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The recrystallization behavior of five low alloyed steels is investigated using double hit deformation tests. It is shown, that Niobium has the biggest influence in retarding the recrystallization kinetics. Further, the microstructural evolution dependent on strain and temperature during deformation is studied with a picric acid etchant and light-optical analysis. It is shown how the microstructure of two differently alloyed ultra-high strength steels changes along with the peculiarities of the corresponding stress-strain curves including the evolution of grain size and aspect ratio of the prior austenite grain. The findings on the different recrystallization kinetics with the role of recrystallization retarding elements are further reinforced by investigations on the Zener-Hollomon parameter and the activation energy needed for dynamic recrystallization. A rolling scenario on a deformation dilatometer is simulated on a hardenable and a micro-alloyed steel to illustrate the microstructural evolution between the rolling steps. It is shown, how the two ultra-high strength steels perform different in their microstructural evolution, as the waiving of micro-alloying elements (MAE) provides finer austenite grains.

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Influence of alloying elements on the mechanical properties of high-strength weld metal

Cited by 18 publications

References 17 publications

Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

Precipitates in microalloyed ultra-high strength weld metal studied by atom probe tomography

Microstructure and mechanical properties of high-strength steel welding consumables with a minimum yield strength of 1100 MPa

Microstructural Analysis of the Recrystallization Behavior of Low Alloyed Steels

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