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Title:
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Microstructural investigation of the NESC-1 clad layer and base material
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Author(s):
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Published by:
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Publication date:
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ECN
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1998
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ECN report number:
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Document type:
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ECN-I--97-047
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Other
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Number of pages:
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Full text:
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29
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Download PDF
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Abstract:
A large international program was performed to characterise the materialproperties of the NESC-1 spinning cylinder. The spinning cylinder is composed
of A533 base material and an austenitic cladding layer. Only a limited amount
of microstructural information is available that can be related to the
various material properties. The large variety in properties of the base
material just under the clad layer are for instance, solely due to the
microstructure of the heat affected zone (HAZ). The investigation of a cross
section parallel to the T-direction revealed a continuous brittle martensitic
layer at the cladding-base material interface, varying in thickness up to
30mum. The fine grained HAZ (FGHAZ) reveals martensitic segregation bands
with a hardness of 375-430HV0.05. So this is expected to be a relative
brittle phase in the HAZ. Low carbon martensite was found in the ER308/309L
cladding material. A decarburized zone (70-80mum) was found at the fusion
line. The base material, HAZ and austenitic clad layer have been investigated
by optical microscopy, hardness measurements and EDX-analysis. 3 refs.
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