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Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Structure Standard: A Detail focus: Plastic Deformation clear all

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Detail of the margin of the perforated hole in the impact position. It is interesting to observe that the perforation caused the material to be expulsed from the hole, in the direction of the impact.
39
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Surface AspectDf - Plastic Deformation

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ML00143 — Impact of a .308 Winchester on A36 PlateM - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Detail of the margin of the perforated hole in the impact position. It is interesting to observe extreme plastic deformation created by the perforation expulsing the material from the hole, in the direction of the impact.
42
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Surface Aspect by SEMDf - Plastic Deformation
Micrography of the plate section, close to the surface that suffered the impact. The copper alloy melted and created a yellow-orange deposit. The plate material presented a strong plastic deformation, aligning the grains and strain hardening the microstructure.
26
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
Micrographic detail of the copper alloy melted and adhered at the surface and a strong plastic deformation of the plate microstructure.
28
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
Micrography of the damaged plate at the side of the bullet impact, top of the figure. The perforated hole expulsed the material to the top and bottom directions and the copper alloy is evident at the hole surface.After etching it is clear the strong plastic deformation of the plate microstructure.
26
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by OMDf - Plastic Deformation
Micrographic detail of the damaged plate at the side of the bullet impact. The perforated hole expulsed the material to the top and bottom directions and the copper alloy is evident at the hole surface. There is a strong plastic deformation of the ferritic-pearlitic microstructure and the hardness level increased from 151 HV to 308 HV (1kg).
20
VIEW
ML00143 / Aug.2018
Impact of a .308 Winchester on A36 Plate
M - Low Carbon SteelP - Rolled PlateAp - StructureCd - Pierced
Cm - Nital Etched Micrography by OMDf - Plastic Deformation

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