Analysis of Composition and Size Distribution of Inclusions in Fe-10Mass%Ni Alloy Deoxidized by Al and Mg Using Laser Ablation ICP Mass Spectrometry

Abstract

The laser ablation ICP mass spectrometry (LA-ICP-MS) has been applied for the quantitative analysis of the inclusion composition and size distribution in an Fe-10mass%Ni alloy deoxidized by Al and/or Mg. The composition and size distributions of particles in the range of d V Ͻ10 mm obtained from LA-ICP-MS are compared with those from SEM with EPMA. It was found that total size distribution of inclusions in the range of d V Ͼ1 mm obtained from LA-ICP-MS agrees reasonably well with that on film filter after electrolytic extraction from SEM. The underestimation of particle number density obtained from LA-ICP-MS is found in the range of d V Ͻ1 mm and it can be explained by the limit of LA-ICP-MS analysis for small size particles on polished metal surface. The LA-ICP-MS is superior to EPMA for the analysis of nonuniform complex inclusions. The inclusion size obtained by Mg followed by Al addition is smaller than that obtained by Al followed by Mg addition. The total compositions for most of inclusions in these experiments are not spinel composition.KEY WORDS: quantitative analysis; deoxidation by Mg and Al; inclusion composition; size distribution; laser ablation ICP mass spectrometry.

Simultaneous Determination of the Composition and Size of Oxide Particles in Solid Materials by Laser Ablation-Inductively Coupled Plasma Mass Spectrometry

“…(14) was obtained with consideration for results of previous reports 18,19) and new data of present study. Some scattering of the data points from the lines in Fig.…”

“…By substituting eqs. (10), (11), (19) and (20) into eq. (18), the size of heterogeneous particle, d V,het , can be written as follows:…”

“…In previous reports, [17][18][19] it was concluded that LA-ICP-MS can be successfully applied to the composition and size determination of oxide particles containing Al 2 O 3 , MgO and CaO in metals and alloys deoxidized with Al, Mg and Ca. However, the other elements such as Si, Mn and Ti are used also often in steelmaking processes for deoxidation and alloying.…”

“…However, the other elements such as Si, Mn and Ti are used also often in steelmaking processes for deoxidation and alloying. In this study, the results of previous investigations [17][18][19] are summarized, and then supplemented with respect to the application of LA-ICP-MS method to the analysis of composition and size of one component and multicomponent particles consisting of Al, Mg, Ca, Mn and Si oxides. For this purpose, the calibration lines for Si and Mn have been obtained.…”

Measurement of Inclusion Size by Laser Ablation ICP Mass Spectrometry

“…The influence of some operating parameters such as energy level and defocus of laser beam on the ion intensity of isotopes by LA-ICP-MS are considered in detail elsewhere. 19) The data obtained at different operating parameters are corrected by using the following procedure. The corrected ion intensity of isotope for a given set of operating parameters p 2 are the mean ion intensities of isotope for M element in a given glass standard sample obtained at different sets of operating parameters p 1 and p 2 , respectively.…”