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Abstract:
The experiments were carried out on laser surface alloying of F. G.
cast iron with pure Si Powder. The composition of the solidified
structures located in the range of ≤2.0%C and 1.62%～9.21%Si. The
processing and mechanism of rapid solidification were discussed. During
the quick heating by laser beam and subsequent rapidly self-quenching
the solidification rate and temperature gradient were chanted, which
determined the morphology and seale of the solidified structure. By
means of SEM with EPMA system and TEM, the details of structure and
phase were observed. The hardening mechanisms of the alloyed structures
were reveled. The structure had not only high hardness value of
830～1120HV, but also high wear resistance which was shown in wear
testing.
Key words:
Surface
alloying F. G. Cast iron Solidification Wearing
resistance
Received
19910805, received in revised form 19920511
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