Section VIII. Element analysis
Quantification of the separate matrix constituents of spheroidal graphite cast iron implanted with 15N by nuclear reaction analysis using an ion muprobe

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Abstract

The retained dose of nitrogen in a spheroidal graphite (SG) cast iron (4% carbon) implanted with 2 × 101715solNcm2 at 200 keV has been determined separately in the iron matrix and in the graphite inclusions of 30 μm average diameter randomly dispersed in the matrix, using the 15N(p, αγ)12C resonance at 898 keV and a proton muprobe focussed to less than 20 μm spot diameter. In normalised and tempered SG cast iron the retained doses were 1.09 × 1017 and 1.74 × 1017Ncm2 in the pearlitic matrix and graphite nodules, respectively, and in induction hardened SG cast iron the retained doses were 1.18 × 1015 and 0.97 × 1017Ncm2 in the martensitic matrix and nodules, respectively. The profile shapes are also quite different in both types of samples, and in both matrix and nodule.

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