The effect of large heat input on the microstructure and corrosion behaviour of simulated heat affected zone in 2205 duplex stainless steel

2011 ◽  
Vol 53 (11) ◽  
pp. 3756-3763 ◽  
Author(s):  
Yinhui Yang ◽  
Biao Yan ◽  
Jie Li ◽  
Jia Wang
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Corrosion Behaviour ◽  
2205 Duplex Stainless Steel ◽  
Large Heat

Effect of heat input on austenite microstructural evolution of simulated heat affected zone in 2205 duplex stainless steel

2018 ◽  
Vol 26 (5) ◽  
pp. 435-441 ◽  
Author(s):  
Tian-hai Wu ◽  
Jian-jun Wang ◽  
Hua-bing Li ◽  
Zhou-hua Jiang ◽  
Chun-ming Liu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Microstructural Evolution ◽  
Heat Affected Zone ◽  
Heat Input ◽  
2205 Duplex Stainless Steel

scholarly journals Corrosion Behavior of Welded Joints in Different Stainless Steels

2001 ◽  
Vol 71 (3) ◽  
pp. 440-449
Author(s):  
Eniko Reka Fabian ◽  
Janos Kuti ◽  
Jozsef Gati ◽  
Laszlo Toth
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Pitting Corrosion ◽  
Stainless Steels ◽  
Heat Affected Zone ◽  
Welding Speed ◽  
Welded Joints ◽  
Heat Input ◽  
Laser Power ◽  
Base Material

The welded metals characteristics produced by TIG welding or laser beam welding depend on heat input as a function of laser power and welding speed. High laser power and high welding speed have produced welded joint with a remarkable decrease in fusion zone size and an acceptable weld profile with high weld depth/width ratio. At duplex stainless steels the microstructure of welded metal, and heat affected zone is strongly influenced by cooling rate, which is depend on heat input as a function of laser power and/or welding speed. It was found that increasing welding speed the corrosion rate of welded joints decreased. In austenitic stainless steels appeared pitting corrosion in the base material as well as in the welding zone. In case of 2304 duplex stainless steel pitting corrosion appeared in welded metal and heat affected zone in case of autogenously welding, but at 2404 duplex stainless steel pitting appear more in the heat affected zone.

scholarly journals Development and Comparison of Quantitative Phase Analysis for Duplex Stainless Steel Weld

2018 ◽  
Vol 62 (3) ◽  
pp. 247-253 ◽  
Author(s):  
Balázs Varbai ◽  
Timothy Pickle ◽  
Kornél Májlinger
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Heat Affected Zone ◽  
Heat Input ◽  
Welding Process ◽  
Phase Ratio ◽  
Quantitative Phase Analysis ◽  
Point Count ◽  
Count Method ◽  
Point Count Method

In duplex stainless steels the ideally 1:1 ratio of austenite-to-ferrite phases ensures the outstanding mechanical and corrosion properties compared to other, conventional stainless steel grades. However, this phase balance can be easily shifted to a mostly austenitic or mostly ferritic microstructures, depending on the welding process and heat input. In order to determine the phase ratio, several methods are available to use, such as Feritscope measurements, ASTM E562 manual point count method (on metallographic images) or quantitative image analysis. From these methods, Feritscope measurements cannot be applied to determine phase quantification in the narrow heat affected zone of duplex stainless steel welds – because of the very limited heat input. The manual point count method is very dependent of the assessor and cannot be automated. In this paper a histogram-based image analyzing process was developed, using Beraha's etchant solution. The results were compared to Feritscope measurements and a very good correlation (R2 = 0.9995) was found. This method will give the ability to easily and automatically measure phase ratio in weld metal, heat affected zone or in subsurface regions of multi-pass welds.

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