Nital etched, OM

3 cases · 8 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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5
VIEW
ML00155 / Jan.2020
Failure of a Prestressed Concrete Steel Strand
M - High Carbon SteelP - Wire RopeAp - StructureCd - Corrosion Fatigue
Cm - Nital etched, OMDf - Austenite
The morphology of the cracking in the weld metal is intergranular (in the previous austenite grain boundaries), and branched. The replication technique was adopted to define the nature of the cracks.
148
VIEW
ML00071 / Jan.2019
Reheating Cracking of a CrMo Vessel Weld
M - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Cm - Nital etched, OMDf - Cracks
Acetate metallographic replica from the surface, before cracking removal, showing the intergranular morphology of the cracks in a very refined weld metal structure.
123
VIEW
ML00010 / Oct.2017
Cold Cracks in a Gouged Weld Metal
M - Low Alloy Low Carbon QTP - Rolled PlateAp - OffshoreCd - Welding Defect
Cm - Nital etched, OMDf - Intergranular Cracking

More from these cases

ML00071 — Reheating Cracking of a CrMo Vessel WeldM - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Detail of the weld metal intergranular and branched cracking (in the previous austenite grain boundaries). The replication technique was adopted to define the nature of the cracks.
125
VIEW
ML00071 / Jan.2019
Reheating Cracking of a CrMo Vessel Weld
M - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Cm - Nital etched, OMDf - Cracks
The forged T presented a ferritic perlitic/bainitic structure at the surface, where the replica was conducted. The base material material hardness is 180 HB.
121
VIEW
ML00071 / Jan.2019
Reheating Cracking of a CrMo Vessel Weld
M - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Cm - Nital etched, OMDf - Ferrite and Bainite
The thick wall tube presented a bainitic structure at the surface, where the replica was conducted. The base material material hardness is 167 HB.
108
VIEW
ML00071 / Jan.2019
Reheating Cracking of a CrMo Vessel Weld
M - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Cm - Nital etched, OMDf - Bainite
The weld metal presented a ferritic/bainitic structure at the surface, where the replica was conducted. The weld metal hardness is 272 HB, too high for this material, suggesting lack of a suitable PWHT.
102
VIEW
ML00071 / Jan.2019
Reheating Cracking of a CrMo Vessel Weld
M - CrMo SteelP - In Field WeldAp - EnergyCd - Welding Defect
Cm - Nital etched, OMDf - Weld Metal
ML00010 — Cold Cracks in a Gouged Weld MetalM - Low Alloy Low Carbon QTP - Rolled PlateAp - OffshoreCd - Welding Defect
Detail of the acetate metallographic replica from the surface, before cracking removal, showing the (previous austenite) intergranular morphology of the cracks in a very refined weld metal structure.
107
VIEW
ML00010 / Oct.2017
Cold Cracks in a Gouged Weld Metal
M - Low Alloy Low Carbon QTP - Rolled PlateAp - OffshoreCd - Welding Defect
Cm - Nital etched, OMDf - Intergranular Cracking