| 摘要 |
1. A method of preparing a steel sample for spectrographic analysis in order to produce a local zone of purified steel flush with the surface of a face of said sample, wherein the sample is subjected to an electric arc established between an electrode (11) and a face of the sample (10) within an enclosure (3) in which an inert atmosphere is maintained, characterized by the following steps : the sample is first subjected to a rapid metal crust removal operation thereby to remove the superficial oxides, and then placed on a cooled metal support (1), the sample is subjected to a local melting using an electric arc, said local melting being maintained during a sufficient time interval such that the inclusions (0) which are contained in the zone (II) adjacent to the impact area of the electric arc are gathered within the zone (I) subjected to the local melting but said time interval being insufficient for the sample being pierced, applying a rapid surfacing of the sample face which was subjected to said local melting thereby to remove said zone (I) within which the inclusions have been gathered and to produce a zone of purified steel (II) flush with the surface of the sample. |
