Journal
JOURNAL OF MATERIALS SCIENCE
Volume 52, Issue 17, Pages 10517-10525Publisher
SPRINGER
DOI: 10.1007/s10853-017-1169-4
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Funding
- LPW Technology
- EPSRC [EP/K503149/1]
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This work investigates whether the unique low thermal expansion property of Invar (64Fe-36Ni) is retained after processing using the additive manufacturing process selective laser melting (SLM). Using this process, near-full-density components (99.96%) were formed by melting thin (20 mu m) layers of powdered Invar (15-45 mu m particle size). The mechanical properties of SLM Invar were comparable to that of cold-drawn Invar36(A (R)); however, the thermal coefficient of expansion was observed to be a lower value and negative up until 100 A degrees C. This negative value was attributed to residual stress in the as-deposited parts. The low thermal expansion property of Invar was still maintained when processed using a non-conventional layer-based additive manufacturing technique.
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