Mechanical Industry

2 cases · 6 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Standard: AISI Detail focus: Microstructure clear all

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Micrography presenting a tempered martensitic microstructure, with light etch in segregated bands.
74
VIEW
ML00182 / Jul.2022
Brittle Fracture of a LAS Fixing Rod
M - Low Alloy Medium Carbon QTP - StemAp - Mechanical IndustryCd - Brittle Fracture
Cm - Nital Etched Micrography by OMDf - Tempered Martensite
Macrography of a circumferential section of the roller bearing, showing two different structures: one, white and hard (64 HRc), close to the external surface; and the other, dark and soft (21 HRc), close to the internal surface. The hardness in the thickness, close to the interface, is about 50 HRc.
122
VIEW
ML00131 / Apr.2018
Brittle Failure of a Soft Roller Bearing
M - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Cm - NItal Etched MacroDf - Duplex structure

More from these cases

ML00131 — Brittle Failure of a Soft Roller BearingM - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Micrographic detail of the roller bearing microstructure, close to the external surface, presenting 64 HRc and a microstructure that is martensitic with large carbides.
86
VIEW
ML00131 / Apr.2018
Brittle Failure of a Soft Roller Bearing
M - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Cm - Nital Etched Micrography by OMDf - Martensite
Micrographic detail of the roller bearing microstructure, close to the internal surface, presenting 21 HRc that reveals that the matrix is not martensitic. It is ferritic with large aligned carbides (cracked).
72
VIEW
ML00131 / Apr.2018
Brittle Failure of a Soft Roller Bearing
M - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Cm - Nital Etched Micrography by OMDf - Ferrite
Ferritic structure close to the internal diameter of the cylindrical roller bearing, in the circuferemtial direction, presenting large carbides (not aligned due to the direction of the section) and small round carbides. in this region the fracture presented ductile micromechanisms (dimples) as well as decohesion of large carbides and cleavage facets, typical of overloading of this low toughness material.
52
VIEW
ML00131 / Apr.2018
Brittle Failure of a Soft Roller Bearing
M - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Cm - Nital Etched Micrography by OMDf - Ferrite
Martensitic structure close to the external diameter of the cylindrical roller bearing, in the circuferemtial direction, presenting large carbides (not aligned due to the direction of the section) and a martensitic matrix. in this region the fracture presented quasecleavage micromechanism as well as decohesion of large carbides.
36
VIEW
ML00131 / Apr.2018
Brittle Failure of a Soft Roller Bearing
M - Wear Resistant SteelP - Roller BearingAp - Mechanical IndustryCd - Heat Treatment Defect
Cm - Nital Etched Micrography by OMDf - Martensite