The Experts below are selected from a list of 273 Experts worldwide ranked by ideXlab platform
Ronald Schnitzer - One of the best experts on this subject based on the ideXlab platform.
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Influence of inhomogeneity on several length scales on the local mechanical properties in V-alloyed all-weld metal
Welding in the World, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Christian Schneider, Ronald SchnitzerAbstract:Recently, a new, vanadium alloyed welding consumable with a Minimum Yield Strength of 1100 MPa was developed. The mechanical properties of welding consumables for gas metal arc welding are usually classified by producing and testing all-weld metal samples, which are typically a multipass weld. Chemical and microstructural fluctuations of a vanadium alloyed all-weld metal sample on a macro- and microscale and their influence on the local mechanical properties were investigated. On a macroscale, hardness mappings show a pattern of hard and soft zones which can differ up to 60 HV. Despite the existence of these fluctuations, undersized Charpy V-notch tests revealed no significant difference between the last weld bead and the underlying ones. It is explained how vanadium and its tendency to form precipitates affect both the hardness inhomogeneity and the toughness homogeneity. On a microscale, segregations of several alloying elements and significant grain size fluctuations were found. Their influence on fluctuations of the mechanical properties is discussed as well.
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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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.
Phillip Haslberger - One of the best experts on this subject based on the ideXlab platform.
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Influence of inhomogeneity on several length scales on the local mechanical properties in V-alloyed all-weld metal
Welding in the World, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Christian Schneider, Ronald SchnitzerAbstract:Recently, a new, vanadium alloyed welding consumable with a Minimum Yield Strength of 1100 MPa was developed. The mechanical properties of welding consumables for gas metal arc welding are usually classified by producing and testing all-weld metal samples, which are typically a multipass weld. Chemical and microstructural fluctuations of a vanadium alloyed all-weld metal sample on a macro- and microscale and their influence on the local mechanical properties were investigated. On a macroscale, hardness mappings show a pattern of hard and soft zones which can differ up to 60 HV. Despite the existence of these fluctuations, undersized Charpy V-notch tests revealed no significant difference between the last weld bead and the underlying ones. It is explained how vanadium and its tendency to form precipitates affect both the hardness inhomogeneity and the toughness homogeneity. On a microscale, segregations of several alloying elements and significant grain size fluctuations were found. Their influence on fluctuations of the mechanical properties is discussed as well.
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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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.
Sandor Holly - One of the best experts on this subject based on the ideXlab platform.
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Influence of inhomogeneity on several length scales on the local mechanical properties in V-alloyed all-weld metal
Welding in the World, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Christian Schneider, Ronald SchnitzerAbstract:Recently, a new, vanadium alloyed welding consumable with a Minimum Yield Strength of 1100 MPa was developed. The mechanical properties of welding consumables for gas metal arc welding are usually classified by producing and testing all-weld metal samples, which are typically a multipass weld. Chemical and microstructural fluctuations of a vanadium alloyed all-weld metal sample on a macro- and microscale and their influence on the local mechanical properties were investigated. On a macroscale, hardness mappings show a pattern of hard and soft zones which can differ up to 60 HV. Despite the existence of these fluctuations, undersized Charpy V-notch tests revealed no significant difference between the last weld bead and the underlying ones. It is explained how vanadium and its tendency to form precipitates affect both the hardness inhomogeneity and the toughness homogeneity. On a microscale, segregations of several alloying elements and significant grain size fluctuations were found. Their influence on fluctuations of the mechanical properties is discussed as well.
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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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.
Wolfgang Ernst - One of the best experts on this subject based on the ideXlab platform.
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Influence of inhomogeneity on several length scales on the local mechanical properties in V-alloyed all-weld metal
Welding in the World, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Christian Schneider, Ronald SchnitzerAbstract:Recently, a new, vanadium alloyed welding consumable with a Minimum Yield Strength of 1100 MPa was developed. The mechanical properties of welding consumables for gas metal arc welding are usually classified by producing and testing all-weld metal samples, which are typically a multipass weld. Chemical and microstructural fluctuations of a vanadium alloyed all-weld metal sample on a macro- and microscale and their influence on the local mechanical properties were investigated. On a macroscale, hardness mappings show a pattern of hard and soft zones which can differ up to 60 HV. Despite the existence of these fluctuations, undersized Charpy V-notch tests revealed no significant difference between the last weld bead and the underlying ones. It is explained how vanadium and its tendency to form precipitates affect both the hardness inhomogeneity and the toughness homogeneity. On a microscale, segregations of several alloying elements and significant grain size fluctuations were found. Their influence on fluctuations of the mechanical properties is discussed as well.
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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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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Microstructure and mechanical properties of high-Strength steel welding consumables with a Minimum Yield Strength of 1100 MPa
Journal of Materials Science, 2018Co-Authors: Phillip Haslberger, Wolfgang Ernst, Sandor Holly, Ronald SchnitzerAbstract: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.
R.j. Dexter - One of the best experts on this subject based on the ideXlab platform.
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Effects of weld metal Strength and defects on the ductility of HSLA-100 plates
1995Co-Authors: R.j. Dexter, M. FerrellAbstract:Wide-plate tension tests were performed on high-Strength low-alloy steel, Minimum Yield Strength of 690 MPa, with various controlled intentional defects in both undermatched and overmatched welds. Lack-of-fusion areas on the sidewall comprising about 10 percent of the cross-section resulted in full net-section Strength. Weld undercut to a depth of 12 percent of the thickness resulted in gross-section Yielding and good elongation. Misalignment (offset) of 3 mm slightly reduced the elongation relative to plates within tolerances. There was no consistent difference between the results of the undermatched welds and the overmatched welds.
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Tensile And Shear Behavior of Undermatched Welded Joints
1995Co-Authors: M Ferrel, R.j. DexterAbstract:Large-scale specimens were made from HSLA-100 steel plate (690 MPa Minimum Yield Strength) featuring groove welds with varying Strength ranging from overmatched to significantly undermatched. Tensile tests with transverse groove welds demonstrated that moderately undermatched joints (15% or less) can achieve Strength and ductility as good as the overmatched welds. Severely undermatched joints (> 25%) provide full Strength, but only limited ductility. The constraint in the large-scale specimens, as in the actual structures, increases the load capacity of the undermatched joints. Unlike the large-scale specimens, conventional flat-strap cross-weld tension specimens cut from the same undermatched welds fail prematurely due to lack of constraint. Shear tests showed that undermatched groove welds do not affect shear Strength and ductility. The test results could be reasonably simulated using small-strain elastoplastic finite-element analysis.