Abstract
In an electromagnetic field, the morphology of a binary faceted-faceted (FF) Ni31Si12-Ni2Si eutectic microstructure and the alloy’s mechanical properties were investigated. Hardness experiments demonstrated that the solidified ingots were significantly strengthened, and the hardness was improved to 63.1 and 786.6 on the Rockwell hardness C and Vickers hardness scales, respectively. Tests of friction and wear in stirred FF eutectic alloys showed excellent anti-fatigue and anti-adhesion wear performance. Alloy changed from an anomalous microstructure to a refined quasi-regular structure, and there was an increase in the lamellar microstructure fraction. The formation process of the refined quasi-regular microstructure and the resulting mechanical properties were investigated.
Highlights
The third type of binary eutectic alloy, i.e. FF eutectic alloys, has rarely been investigated
Around the eutectic composition of 29.8% Si, the ordered intermetallic compound (Ni31Si12) and (Ni2Si) phases are formed in an equilibrium eutectic reaction [21], by initiating the 50-Hz/120-A electromagnetic field as soon as the molten metal was poured into the austenitic-steel crucible
The HV and HRC values of Ni31Si12-Ni2Si eutectic alloys with an electromagnetic field improved by 17.9% and HV 786 788 778 772 809 786.6 electromagnetic HRC 64.5 63.5 62 64 63.5 63.1
Summary
Received August 26, 2011; accepted September 28, 2011; published online March 8, 2012. Anisotropic growth of the eutectic phase is strong in the solidification process and the solidified structure is extremely complex. It is very difficult for such eutectic alloys to achieve a regular structure under. If we can obtain a refined and uniform solidified structure, the toughness and plasticity will be improved This will greatly reduce the processing costs and increase the use of binary FF eutectic alloys. Regular microstructures have been obtained in FF Ni31Si12-Ni2Si eutectic alloys by rapid solidification [8]. FF Ni31Si12Ni2Si eutectic alloys have potential applications under hightemperature conditions, so we tried to obtain refined or quasiregular microstructures of binary FF Ni31Si12-Ni2Si eutectic alloys using rotary magnetic fields
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