





Microstructure
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Crevice Corrosion in a Subsea System — Aspect Before Analysis
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Aged Martensite 5Alpha 4Alpha & Beta 1Austenite 20Austenitic Matrix 1Austeno ferritic 2Bainite 2Bainitic Martensitic 2Carburized Layer 1Coarse Precipitation at Grain Boundaries 1Coarse Structure 2Coating Layer 6Cored Matrix 1Dendritic 4Detrimental phases 4Duplex Ferritic Austenitic 10Equiaxial Grains 2Ferrite and Carbides 1Ferritic 4Ferritic Bainitic 5Ferritic matrix 4Ferritic pearlitic 12Ferritic pearlitic matrix 2Fine Transgranular Precipitation 1Free from Carbides 1Grain Boundary Phases 1Granular 6Graphite in flakes 1Graphite in nodules 4Graphite in nodules, imperfect 1Hypoeutectic 2Intragranular Intergranular Precipitates 1Lamellar Eutectoid 1Large Grains 1Large amount of inclusions 1Local Melting 1Martensite 13Martensite and Carbides 2Martensite and Retained Austenite 3Monophasic 2Network of Primary Carbides 1Networlike Precipitates 1Pb Inclusions 1Pearlite Highly Strained 1Pearlitic 7Pearlitic Matrix 1Precipitation Hardened 3Primary carbides 2Refined ferritic 1Secondary carbides 5Segregation Bands 7Small Amount of Delta Phase 2Small amount of delta ferrite 2Strain Hardened 9Surface layer of Thermal Spray 4Tempered Martensite 21Zinc Layer 2