Abrasive blasting contamination in Super Duplex and carbon steels - a quantification approach by rietveld analysis

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 17; no. 5; pp. 1356 - 1366
• Main Authors: Rocha, Adriana da Cunha, Nascimento, Áquila Vieira do, Margarit-Mattos, Isabel Cristina Pereira, Assis, Kioshy dos Santos, Mattos, Oscar Rosa
• Format: Journal Article
• Language: English; Portuguese; Spanish
• Published: ABM, ABC, ABPol 01.10.2014; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: abrasive contamination; Aluminum oxide; Carbon steels; Contamination; Duplex Stainless Steel; Duplex stainless steels; ENGINEERING, CHEMICAL; Martensitic stainless steels; MATERIALS SCIENCE, MULTIDISCIPLINARY; Mathematical models; METALLURGY & METALLURGICAL ENGINEERING; Rietveld method; Steels; Substrates; x-ray diffraction; Rietveld method; Duplex Stainless Steel; x-ray diffraction; abrasive contamination
• ISSN: 1516-1439; 1980-5373; 1516-1439; 1980-5373
• DOI: 10.1590/1516-1439.313514

A methodology for quantifying the contamination after abrasive blasting by Aluminum Oxide and Martensitic Carbon Steel particles in Super Duplex and Carbon Steel substrates has been developed. The method consisted of performing x-ray diffraction in the blasted steel substrates and calculating the particle contamination using Rietveld Quantitative Method. In this way, it is possible to evaluate the substrate volume in which the abrasive particles have been trapped (taking into account the surface roughness) rather than solely performing visual examination, as indicated by standards documents. Equations describing the intensity model of the diffracted peaks as well as those describing the quantitative measurements are presented. Correction functions are also employed to compensate the effect of the surface roughness generated on the metallic substrates after blasting. Alumina and martensitic steel abrasives contaminations were detected and quantified in both steel substrates. Results showed that Super Duplex Steel substrates revealed a higher degree of contamination when compared to the Carbon Steel substrates, both for alumina abrasives as for martensitic abrasives. Also, the abrasive that generated the lower degree of contamination was the Martensitic Carbon Steel, for both substrates.