Kalling Etched Micrography by OM

2 cases · 6 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Detail focus: Banded Structure clear all

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Low magnification micrography of the nut in the longitudinal section, presenting the machined internal thread and a banded microstructure.
55
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Banded Structure
Micrographic detail of the pin microstructure at the longitudinal section showing a tempered martensitic structure and a band of retained austenite.
61
VIEW
ML00085 / Nov.2017
Corrosion Fatigue of a Martensitic SS Pin
M - Martensitic Stainless SteelP - Forged PinAp - O&G Well DrillingCd - Corrosion Fatigue
Cm - Kalling Etched Micrography by OMDf - Banded Structure

More from these cases

ML00148 — Brittle Fracture of a 420 SS Barrel NutM - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Microstructural aspect of a longitudinal section of the nut, in the middle of the thickness. Martensitic structure, banded.
46
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Banded Structure
Microstructural detail of the banded structure. The rough aspect of the band is created by the carbides (better seen in the higher magnification image) in the segregation band.
38
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Banded Structure
Vickers microhardness identations using 100 grams. In a position out of the band (top line). Values from left to right, 380HV; 390HV and 394HV. In a position inside the band (bottom line). Values from left to right, 433HV, 483HV and 473 HV.
33
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Banded Structure
Low magnification micrography of the nut in the longitudinal section, presenting the machined internal thread and a banded microstructure. It is possible to see that the contact pressure in the thread caused a surface plastically deformation.
23
VIEW
ML00148 / Sep.2018
Brittle Fracture of a 420 SS Barrel Nut
M - Martensitic Stainless SteelP - Barrel NutAp - LiftingCd - Heat Treatment Defect
Cm - Kalling Etched Micrography by OMDf - Banded Structure