Effects of Shielding Gas on the Mechanical and Microstructural Properties of 409L Ferritic Stainless Steels during Gas Metal Arc Welding

Journal of Environmental Friendly Materials

مقاله 6، دوره 1، شماره 2، آذر 2017، صفحه 33-40   

نوع مقاله: Original Article

نویسندگان

A. Feghhi¹؛ A. Emamikhah²؛ Y. Bayat Asl²

¹Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.

²Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.

چکیده

The present study investigates the effects of type of shielding gas on the weld microstructure and mechanical properties of 409L ferritic stainless steel. For this purpose, Ar, Ar +20% He, Ar + 12% CO₂, and Ar ₊ 25% CO₂ were used as shielding gases in gas metal arc welding (GMAW) of stainless steel. To evaluate the welds, non-destructive inspections of the specimens were followed by mechanical (hardness and tensile) tests while microstructural examinations of both the heat affected zone (HAZ) and the fusion zone were performed. Moreover, the phases produced were observed and identified by analyzing the specimens using SEM and EDS techniques. Results showed that specimens welded with Ar + 25% CO₂ and Ar + 12% CO₂ have the highest strength and hardness values in the fusion zone due to the formation of martensite around the ferrite grains. However, the enhancements observed in the mechanical properties of specimens welded with Ar and Ar +20% He were attributed to the reduced ferrite grain size and martensite content

کلیدواژه‌ها

Ferritic Stainless Steels؛ Shielding Gas؛ Gas Metal Arc Welding؛ Microstructure؛ Mechanical Tests

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