The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Birhan Sefer - One of the best experts on this subject based on the ideXlab platform.
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Chemical Milling of cast ti 6al 4v and ti 6al 2sn 4zr 2mo alloys in hydrofluoric nitric acid solutions
Corrosion, 2017Co-Authors: Birhan Sefer, Robert Pederson, Illia Dobryden, Nils Almqvist, Martalena AnttiAbstract:The behavior of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo during Chemical Milling in hydrofluoric-nitric (HF-HNO3) acid solutions with 1:3 and 1:11 molar ratios was investigated using electroChemical and atomic force microscopy (AFM) techniques. Faster corrosion rate in 1:3 solutions was measured for Ti-6Al-4V than for Ti-6Al-2Sn-4Zr-2Mo, whereas in 1:11 solution Ti-6Al-2Sn-4Zr-2Mo exhibited higher corrosion rate. Scanning Kelvin probe force microscopy measurements revealed difference in the Volta potential between the α-laths and the β-layers in the Widmansttaten microstructure indicating operation of microgalvanic cells between the microconstituents when in contact with HF-HNO3 solution. The AFM topography measurements demonstrated faster corrosion of the α-laths compared to the β-layers, in both alloys. In 1:3 solutions, higher α/β height difference was measured in Ti-6Al-4V, whereas in 1:11 solution, the difference was higher in Ti-6Al-2Sn-4Zr-2Mo. The results revealed that the Chemical Milling behavior o...
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Chemical Milling effect on the low cycle fatigue properties of cast ti 6al 2sn 4zr 2mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
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Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
Robert Pederson - One of the best experts on this subject based on the ideXlab platform.
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Chemical Milling of cast ti 6al 4v and ti 6al 2sn 4zr 2mo alloys in hydrofluoric nitric acid solutions
Corrosion, 2017Co-Authors: Birhan Sefer, Robert Pederson, Illia Dobryden, Nils Almqvist, Martalena AnttiAbstract:The behavior of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo during Chemical Milling in hydrofluoric-nitric (HF-HNO3) acid solutions with 1:3 and 1:11 molar ratios was investigated using electroChemical and atomic force microscopy (AFM) techniques. Faster corrosion rate in 1:3 solutions was measured for Ti-6Al-4V than for Ti-6Al-2Sn-4Zr-2Mo, whereas in 1:11 solution Ti-6Al-2Sn-4Zr-2Mo exhibited higher corrosion rate. Scanning Kelvin probe force microscopy measurements revealed difference in the Volta potential between the α-laths and the β-layers in the Widmansttaten microstructure indicating operation of microgalvanic cells between the microconstituents when in contact with HF-HNO3 solution. The AFM topography measurements demonstrated faster corrosion of the α-laths compared to the β-layers, in both alloys. In 1:3 solutions, higher α/β height difference was measured in Ti-6Al-4V, whereas in 1:11 solution, the difference was higher in Ti-6Al-2Sn-4Zr-2Mo. The results revealed that the Chemical Milling behavior o...
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Chemical Milling effect on the low cycle fatigue properties of cast ti 6al 2sn 4zr 2mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
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Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
Martalena Antti - One of the best experts on this subject based on the ideXlab platform.
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Chemical Milling of cast ti 6al 4v and ti 6al 2sn 4zr 2mo alloys in hydrofluoric nitric acid solutions
Corrosion, 2017Co-Authors: Birhan Sefer, Robert Pederson, Illia Dobryden, Nils Almqvist, Martalena AnttiAbstract:The behavior of cast Ti-6Al-4V and Ti-6Al-2Sn-4Zr-2Mo during Chemical Milling in hydrofluoric-nitric (HF-HNO3) acid solutions with 1:3 and 1:11 molar ratios was investigated using electroChemical and atomic force microscopy (AFM) techniques. Faster corrosion rate in 1:3 solutions was measured for Ti-6Al-4V than for Ti-6Al-2Sn-4Zr-2Mo, whereas in 1:11 solution Ti-6Al-2Sn-4Zr-2Mo exhibited higher corrosion rate. Scanning Kelvin probe force microscopy measurements revealed difference in the Volta potential between the α-laths and the β-layers in the Widmansttaten microstructure indicating operation of microgalvanic cells between the microconstituents when in contact with HF-HNO3 solution. The AFM topography measurements demonstrated faster corrosion of the α-laths compared to the β-layers, in both alloys. In 1:3 solutions, higher α/β height difference was measured in Ti-6Al-4V, whereas in 1:11 solution, the difference was higher in Ti-6Al-2Sn-4Zr-2Mo. The results revealed that the Chemical Milling behavior o...
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Chemical Milling effect on the low cycle fatigue properties of cast ti 6al 2sn 4zr 2mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
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Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
A Mateo - One of the best experts on this subject based on the ideXlab platform.
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Chemical Milling effect on the low cycle fatigue properties of cast ti 6al 2sn 4zr 2mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
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Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
Raghuveer Gaddam - One of the best experts on this subject based on the ideXlab platform.
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Chemical Milling effect on the low cycle fatigue properties of cast ti 6al 2sn 4zr 2mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.
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Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy
International Journal of Fatigue, 2016Co-Authors: Birhan Sefer, Raghuveer Gaddam, A Mateo, Martalena Antti, Robert PedersonAbstract:The current research work presents the Chemical Milling effect on the low cycle fatigue properties of cast Ti–6Al–2Sn–4Zr–2Mo alloy. Chemical Milling treatment is one of the final steps in manufacturing titanium alloy components that removes the brittle alpha-case layer formed during various thermal processes. The treatment includes immersion of the components in solutions containing hydrofluoric (HF) and nitric (HNO3) acids in relevant molar ratios. Although this treatment demonstrates advantages in handling components with complex net geometries, it may have detrimental effects on the surface, by introducing pitting and/or intergranular corrosion and thereby adversely affecting in particular the fatigue strength. The first series of specimens were tested in as-machined condition. Two more series were, prior to fatigue testing, subjected to 5 and 60 min Chemical Milling treatment. It was found that the fatigue lives were substantially decreased for the Chemically treated specimens. The fractographic investigation of all mechanically tested samples revealed multiple fatigue crack initiation sites in the Chemically milled samples. These cracks were located either at the prior beta grain boundary or the prior beta grain boundary triple joints. The prior beta grain boundaries were found to have deep ditch-like appearance which depth increased with increasing Milling time. These ditch-like grain boundaries acts as stress raisers and thereby promote early fatigue crack initiation and thus lower fatigue life.