Fiber laser beam welding of additive manufactured 316L austenitic stainless steel with wrought 2507 super duplex and wrought 904L super austenitic stainless steels: Crystallographic texture, microstructure, and mechanical properties

Köse, Ceyhun

doi:10.1016/j.vacuum.2023.112347

Cited by 34 publications

(1 citation statement)

References 49 publications

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“…Duplex and super duplex stainless steels (DSS and SDSS, respectively) are widely used in industries such as marine, nuclear, and petrochemical plants due to their mechanical properties, good weldability, and high corrosion resistance. SDSSs also have an excellent combination of heat transfer capability and thermal expansion coefficient, i.e., high heat transfer and low thermal expansion of the material [1][2][3]. DSSs and SDSSs have a balanced bimetallic microstructure of 50% ferrite and 50% austenite, which is responsible for the material good properties, as well as its excellent applicability, even in aggressive environments [3][4][5].…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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Effect of Boron on the Solidification Characteristics and Constitutive Equation of S31254 Superaustenitic Stainless Steel

Liu,

Wang,

Chen

et al. 2024

steel research int.

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Solidification structure and segregation behavior of S31254 superaustenitic stainless steel ingot containing 0 wt% B and 0.005 wt% B are investigated. The results show that serious element segregation and massive eutectics are present in the center of the ingot. By contrast, the addition of boron reduces the secondary dendrite spacing, the degree of elemental segregation, and the σ phase. Further, the effect of boron on the solidification process is studied by using the high‐temperature confocal laser scanning microscope and combined with Thermo‐Calc thermodynamic simulation results. The results show that boron can widen the solidification temperature range and greatly retard the matrix solidification. The role of boron in refining dendrite structure and inhibiting precipitation is further confirmed. The effect of boron on the constitutive equation of S31254 superaustenitic stainless steel has also been researched through isothermal compression testing in the temperature range of 950–1200 °C and strain rate range of 0.01–10 s−1. The activation energy of the boron‐free and boron‐containing S31254 superaustenitic stainless steels based on the constitutive equation are 427.77 and 495.80 kJ mol−1, respectively. Processing maps indicate that the instability domain is significantly reduced and the hot ductility is improved after the addition of B.

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Microstructure and Hot Oxidation Resistance of Wrought and Wire Arc Additive Manufactured Austenitic Stainless Steel 347

Rajesh Kannan,

Rajkumar,

Durgaprasad

et al. 2024

steel research int.

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Boiler steels in gas turbines and waste‐to‐energy recovery units undergo severe damage due to oxidation. The hot oxidation behavior of wire arc additive manufactured austenitic stainless steel 347 (WAAM 347) and wrought alloy AISI 347 are examined at 700 °C for 50 cycles in a hot still environment. The microstructural characteristics and oxidation species are evaluated. In comparison with the wrought AISI 347, the WAAM 347 wall with equiaxed and large columnar dendrites along with lower residual ferrite and niobium carbide aids in better oxidation resistance despite having an identical oxide layer comprising of an inner oxidation zone rich in Cr and Fe, and an exterior oxide layer rich in Fe. The overall weight gain in WAAM 347 specimens ranges between 0.83 and 0.90 mg cm−2 with a lower oxidation rate and is less than that in AISI 347 (3.29 mg cm−2). X‐ray diffraction analysis reveals the presence of Fe2O3, FeCr2O4, NiO, and Cr2O3 along with NiCr2O4 spinel phases. The higher wt% of Cr and the formation of oxidation species such as NiO, NiCr2O4, and Cr2O3 are attributed to the reduced oxidation rate in WAAM 347. The research findings indicate that WAAM can fabricate customized components with comparable hot oxidation performance.

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Fiber laser beam welding of additive manufactured 316L austenitic stainless steel with wrought 2507 super duplex and wrought 904L super austenitic stainless steels: Crystallographic texture, microstructure, and mechanical properties

Cited by 34 publications

References 49 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

Effect of Boron on the Solidification Characteristics and Constitutive Equation of S31254 Superaustenitic Stainless Steel

Microstructure and Hot Oxidation Resistance of Wrought and Wire Arc Additive Manufactured Austenitic Stainless Steel 347

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