Columnar Grains

4 cases · 5 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

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Micrographic detail of the weld metal in the last bead. The microstructure shows primary ferrite in the (previous austenite) grain boundaries, some regions of ferrite with aligned second phases and acicular ferrite in the center of the columnar grains.
51
VIEW
ML00153 / Jan.2019
X52 in a Tubular Structure
M - CMn SteelP - Seamless PipeAp - StructureCd - Qualified
Cm - Nital Etched Micrography by OMDf - Columnar Grains
The macrography of the transverse section shows the columnar grains typical of a centrifugally cast material. The etch is the same as the adopted for the micrographies. The bushing thickness is 1/2".
41
VIEW
ML00044 / Feb.2017
Centrifugally Cast CuAl Bushing
M - Aluminum BronzeP - Cast BushingAp - EngineCd - Removed From Service
Cm - Transverse Section AspectDf - Columnar Grains
The microstructure of the pipe seam weld metal, in the center of the thickness, presents a coarse prior beta grain size.
85
VIEW
ML00005 / Apr.2017
Environmental Hydrogen Damage in Ti Pipe
M - Unalloyed TitaniumP - Longitudinal Seam Welded PipeAp - PipingCd - Hydride Formation
Cm - Kroll Etched Micrography by OMDf - Columnar Grains
Micrography of the transverse section of the tube presenting the columnar grains of the autogenous weld, in the central region of the weld.
26
VIEW
ML00026 / Feb.2017
Autogenous Seam Welded Tube in Ferritic SS
M - Ferritic Stainless SteelP - Fabrication WeldAp - AutomotiveCd - Typical manufacturing
Cm - Kalling Etched Micrography by OMDf - Columnar Grains

More from these cases

ML00026 — Autogenous Seam Welded Tube in Ferritic SSM - Ferritic Stainless SteelP - Fabrication WeldAp - AutomotiveCd - Typical manufacturing
Micrography of the transverse section of the tube presenting the columnar grains of the autogenous weld, in the central region of the weld.
22
VIEW
ML00026 / Feb.2017
Autogenous Seam Welded Tube in Ferritic SS
M - Ferritic Stainless SteelP - Fabrication WeldAp - AutomotiveCd - Typical manufacturing
Cm - Kalling Etched Micrography by OMDf - Columnar Grains