Effects of CNTs addition on the microstructure and microhardness of stainless steel alloy/carbon-manganese non-alloyed steel welding

• Type: Article in International Scientific Journal
• Date: 2021

Authors

Marcos Allan dos Reis (Author) Other; Mário Edson S. de Sousa (Author) Other; André A. Ferreira (Author) Other; Íris S. M. Carneiro (Author) Other; Clarissa H. de Melo (Author) Other; Marcionilo N. S. Junior (Author) Other; Manuel F. Vieira (Author) FEUP

Journal

Title: Journal of Composite Materials

Vol. 55 No. 22

Pages: 3061-3069

ISSN: 0021-9983

Publisher: SAGE

Indexing

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Other information

Authenticus ID: P-00T-RNB

DOI: 10.1177/00219983211007201

Abstract (EN): In recent years some progress has been made about the addition of Carbon Nanotubes (CNTs) in the stainless steel metal matrix by pulsed Gas Tungsten Arc Welding (P-GTAW). Despite that, there is lack of information regarding to microstructural modifications induced by CNTs in dissimilar welding. In this sense, we present the welding of nanocomposite based on Nickel/Carbon Nanotubes-stainless steel 316L alloy (Ni/CNTs-SS 316L), as the welding metal, on carbon-manganese (C-Mn) non-alloyed structural steel, as the base metal. The microstructure of manufactured specimens with/without nanocomposite was characterized by: optical microscopy; Raman spectroscopy; scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS) and electron backscattering diffraction (EBSD). Moreover, Vickers tests were performed from the welding metal (WM) to the base metal (BM) before/after temper treatment in order to investigate the microhardness changes. The results show that dilution rate and grain size for specimen with nanocomposite was higher than without nanocomposite; the CNTs affected the misorientation angle and texture of the WM; the topside microhardness from WM with Ni-CNTs was on average 30.40% higher than BM; and, in transverse cross-section microhardness was 31% higher than control sample on average at fusion line zone. These results indicate that addition of CNTs in the metallic matrix by dissimilar welding is a fertile ground for new studies applicable to manufacturing industry.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9