Problems of Ferrite Content Determination

Bögre, Bálint; Mészarós, István

doi:10.3311/ppme.15022

Cited by 5 publications

(1 citation statement)

References 15 publications

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“…The ferrite ratio was also measured with Fischer FMP30 Feritscope. The feritscope has a larger measured volume to be measured comparing to the metallographic techniques [29]. It should be noted that the feritscope measures a larger average volume, while the optical microscope provides a 2D image of a 1.7x1.7 mm area in our case.…”

Section: Fig 3 Location Of the Removed Partmentioning

confidence: 82%

The Effects of ArC Voltage and Shielding Gas Type on the Microstructure of Wire ArC Additively Manufactured 2209 Duplex Stainless Steel

Kemény,

Sándor,

Varbai

et al. 2023

Advances in Materials Science

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Duplex stainless steels (DSSs) are widely used due to their corrosion resistance. Austenite and ferrite determine the excellent properties. Ferrite provides strength and good corrosion resistance, while austenite provides toughness and weldability. During our research, samples were produced with ER 2209 duplex steel wire using wire arc additive manufacturing (WAAM). Two different 17 V and 19 V arc voltages were used during the production. Two shielding gases were used for each voltage: M12-ArC-2.5 and M12-ArHeC-20/2. The research aimed to determine the ferrite ratio as a function of the welding parameters. The ferrite (or austenite) content must be between 30% and 70% for duplex stainless steel welds, according to the ISO 17781 standard. Based on our research, it can be stated that the austenite ratio increases as the voltage increases, thus failing to fulfill the standard's requirements. The helium content reduced the ferrite ratio even when the 17 V voltage was used due to the gas's higher ionization potential. During the metallographic examination, our welded samples met the standard requirements for the austenite content for 17 V arc voltage and M12-ArC-2.5 shielding gas. The ferrite content in the entire sample cross-section fell between 30-42% during feritscope and image analysis measurements. These welding parameters can be recommended for industrial applications.

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Section: Fig 3 Location Of the Removed Partmentioning

confidence: 82%