Brittle Behavior

1 case · 6 images

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Application: Gas Turbine clear all

Brittle Behavior — sub-branches

Intergranular Cracking 1

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Transverse section of the blade showing large grains of this poliycristaline cast material.
421
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - H2SO4+HNO3+H3PO4 Etched MicroDf - Coarse Structure

More from these cases

ML00042 — Gas Turbine Blade IN 939, CoatedM - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Micrography of the blade, view inside the grain. The intragranular precipitation presents one unique size of precipitation, not yet coalesced, although the blade was in high temperature service for 50.000 hours. Etched by H2SO4 + HNO3 + H3PO4 reagent.
66
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - Micrography by SEMDf - Intragranular Secondary Precipitation
Micrography close to the surface of the blade, showing the diffusion coating (aluminum base alloy) that is still sound. No strong oxidation or erosion was detected.
53
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - H2SO4+HNO3+H3PO4 Etched MicroDf - Coating
Micrographic detail of the diffusion coating. H2SO4 + HNO3 + H3PO4 etched.
47
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - Micrography by SEMDf - Coating
Micrography as polished of the region where there was a refrigeration hole, presenting a cracking.
35
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - Micrography by OMDf - Cracking
The cracking from the refrigeration hole presents an intergranular morphology, as shown in the micrography of a transverse section of the blade.
35
VIEW
ML00042 / Apr.2017
Gas Turbine Blade IN 939, Coated
M - NiCrCo AlloyP - CastAp - Gas TurbineCd - Intergranular Cracking
Cm - H2SO4+HNO3+H3PO4 Etched MicroDf - Intergranular Cracking