METALOGRAPHY METHOD(Berdasarkan ERA Tech nology)

Ferrite/Bainite

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Ferrite/Pearlite

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Class / Stadium A B c D E F

Approx.Damage 0% 20% 40% 600/o 80o/o End Of Life

Approx. LifeRemaining 100o/o 80% 60% 40% 20% None

NatureNo Creep Defect,

Ferrite and distincttransformation

product

lncipient Spheroi-disation and

isolated carbidaprecipitation,

notably at grainboundaries

Evident Spheroi.disation of trans-formation productFerrite and trans-formation producteasily distinguish.

able

Full Spheroidisa-tion of transfor.mation product.No significant

carbide precipita.tion within ferrite

grains

Full Spheroidisa-tion. Carbides

evently dispersedthroughout gralns

and at grainboundaries

FullSpheroidisation.

Significantcoalescence

between carides

Action NoneReinspection afterApprox. 100.000service hours

Reinspection afterApprox. 50.000service hours

Reinspection afterApprox.35.000service hours

Reinspectlon afterApprox. 100.000

service hours

Management mustbe inforr,red im-

mediately grindingto determlne crack

depth

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