Addition of Nickel by the Watts Bath as a Way to Correct the Phase Balance on Nd:YAG Pulsed-Laser-Welded UNS S32750

Cruz, Eli; Seloto, Bruna Berbel; Ventrella, Vicente Afonso; Settimi, Alessio Giorgio; Gennari, Claudio; Calliari, Irene; Zambon, A.

doi:10.1007/s11661-021-06521-0

Cited by 3 publications

(3 citation statements)

References 26 publications

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“…Studies of specialized welding have explored SDDS laser welding, which involves the use of austenite-promoting elements to increase the volume fraction of austenite [3,10,12,15,18,19]. The addition of elements or preheating can increase the austenite volume fraction.…”

Section: Resultsmentioning

confidence: 99%

“…This process requires maintaining the temperature at the austenite formation level for a while. In high-cooling-rate scenarios, like pulsed laser welding, there is insufficient time to complete austenite formation, leading to an unbalanced microstructure [15]. The microstructural unbalance has a negative effect on both the mechanical and corrosion resistance properties of the material [16].…”

Section: Resultsmentioning

confidence: 99%

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Effects of Base Metal Preheating on the Microstructure, Mechanical Properties, and Corrosion Resistance of UNS S32750 SDSS Pulsed Nd:YAG Laser Welding

da Cruz Junior,

Varasquim,

Crespo

et al. 2023

Coatings

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Super duplex stainless steel has a microstructure consisting of equal proportions of austenite and ferrite. However, welding with Nd:YAG pulsed laser results in an imbalanced microstructure that compromises the steel’s properties. This paper studied the effects of preheating the base metal on pulsed Nd:YAG laser welding. Four conditions were evaluated (no preheating and heating at 100 °C, 200 °C, and 300 °C). The analysis included studying the microstructure, microhardness, and corrosion resistance. Preheating the base metals was found to be an effective method for increasing the volume fractions of austenite. The preheated samples showed an improvement in corrosion resistance compared to the untreated sample. The microhardness varied, with the ferrite amount being higher in the untreated sample.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Effects of Base Metal Preheating on the Microstructure, Mechanical Properties, and Corrosion Resistance of UNS S32750 SDSS Pulsed Nd:YAG Laser Welding

da Cruz Junior,

Varasquim,

Crespo

et al. 2023

Coatings

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“…It is quite challenging to add alloying elements in Nd:YAG pulsed laser welding due to process characteristics, using either shielding gas or filler wires [29]. Da Cruz Junior et al reported the use of a nickel electroplating technique for preparing surfaces of SDSS mechanical elements to be welded [30]. They submitted the surface to be welded to the Watts bath, promoting the formation of a nickel layer.…”

Section: Introductionmentioning

confidence: 99%

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

et al. 2023

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Super-duplex stainless steel (SDSS) shows high mechanical and corrosion resistance because of the balanced structure of austenite and ferrite. However, maintaining this phase ratio after welding is a challenge. The use of austenite stabilizing components is recommended to balance the microstructure. The addition of alloying elements presents a challenge because of the characteristics of Nd:YAG pulsed laser welding. An approach, which has proven to be effective, is to use metal electroplating to prepare the surfaces of the mechanical SDSS components that will be welded, therefore promoting the phase balance in the fusion zone. While the effects of metals such as nickel as an austenite stabilizer are well recognized, cobalt’s effects require more research. The present work investigated the influence of the use of cobalt addition in the joining process by preliminary electroplating on UNS S32750 SDSS Nd: YAG pulsed laser welding, specifically regarding microstructure and microhardness. Three conditions were investigated, changing the thickness of the deposited cobalt layer. The addition of cobalt modified the morphology and increased the volume fraction of austenite. An austenite volume fraction of around 48% was obtained using a 35 μm thick cobalt coating. The microhardness was affected by austenite/ferrite proportions. The microhardness dropped from about 375 HV to 345 HV as the cobalt layer’s thickness rose, being similar to that of the base metal. The effect of cobalt as an austenite stabilizer was observed, and the cobalt electroplating technique was effective to correct the phase balance on UNS S32750 laser welding.

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Investigation on Corrosion Behavior of Simulated Welding HAZ for 22 pct Cr Lean Duplex Stainless Steel With Different Mn/N Ratio Addition

Yang

2023

Metall Mater Trans A

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Addition of Nickel by the Watts Bath as a Way to Correct the Phase Balance on Nd:YAG Pulsed-Laser-Welded UNS S32750

Cited by 3 publications

References 26 publications

Effects of Base Metal Preheating on the Microstructure, Mechanical Properties, and Corrosion Resistance of UNS S32750 SDSS Pulsed Nd:YAG Laser Welding

Effects of Base Metal Preheating on the Microstructure, Mechanical Properties, and Corrosion Resistance of UNS S32750 SDSS Pulsed Nd:YAG Laser Welding

Correction of Phase Balance on Nd:YAG Pulsed Laser Welded UNS S32750 Using Cobalt Electroplating Technique

Investigation on Corrosion Behavior of Simulated Welding HAZ for 22 pct Cr Lean Duplex Stainless Steel With Different Mn/N Ratio Addition

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