Microstructure Influence on Corrosion Resistance of Brazed AISI 304L/NiCrSiB Joints

Penyaz, Milena; Otto, Johanna; Popov, N. S.; Ivannikov, A. A.; Schmiedt-Kalenborn, Anke; Walther, Frank; Kalin, B. A.

doi:10.1007/s12540-021-00974-z

Cited by 7 publications

(1 citation statement)

References 28 publications

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“…So, one of the aims was to investigate the influence of chromium and molybdenum-in previous studies, the authors also investigated these in terms of corrosion resistance [14] and corrosion fatigue behavior [15]. Furthermore, so far, how the alloy and holding time change the residual stress state of austenitic steel joints has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Otto

Penyaz

Möhring

et al. 2021

Metals

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The knowledge of alloy–process–structure–property relationships is of particular interest for several safety-critical brazed components and requires a detailed characterization. Thus, three different nickel-based brazing filler metals were produced with varying chromium and molybdenum content and were used to braze butt joints of the austenitic stainless steel AISI 304L under vacuum. Two holding times were used to evaluate diffusion-related differences, resulting in six specimen variations. Significant microstructural changes due to the formation and location of borides and silicides were demonstrated. Using X-ray diffraction, alloy-dependent residual stress gradients from the brazing seam to the base material were determined and the thermal-induced residual stresses were shown through simulations. For mechanical characterization, impact tests were carried out to determine the impact toughness, as well as tensile tests at low and high strain rates to evaluate the strain-rate-dependent tensile strength of the brazed joints. Further thermal, electrical, and magnetic measurements enabled an understanding of the deformation mechanisms. The negative influence of brittle phases in the seam center could be quantified and showed the most significant effects under impact loading. Fractographic investigations subsequently enabled an enhanced understanding of the fracture mechanisms.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Otto

Penyaz

Möhring

et al. 2021

Metals

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Influence of nitrogen content on the pit formation and pit propagation in the welded joints of X5CrNi18‐10 stainless steel

Radojković,

Jegdić,

Pejić

et al. 2023

Materials & Corrosion

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The influence of welding current and nitrogen content in argon shielding gas on the resistance of the welded joint (weld metal and heat‐affected zone [HAZ]) of the stainless steel X5CrNi18‐10 to the formation and growth of pits was investigated. Also, the susceptibility of the welded joint to intergranular corrosion was examined. Pitting corrosion resistance indicators were determined based on anodic potentiodynamic polarization measurements in NaCl + Na2SO4 solution, while susceptibility to intergranular corrosion was determined by the potentiokinetic method with a double loop (DL EPR). SEM/EDS was used to analyze the microstructure. It has been shown that higher nitrogen content in shielding gas leads to an increase in the resistance of welded joints (weld metal and HAZ) to the pit formation. However, an improvement in the resistance to the pit formation leads to a decline in the resistance of the welded joint to pit growth. An explanation of this phenomenon is proposed. Also, it was shown that the increase of the welding current increases the susceptibility of the welded joint to intergranular corrosion, while the higher nitrogen content has no effect.

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Non-Destructive Evaluation of the AISI 304 Stainless Steel Susceptibility to Intergranular Corrosion by Electrical Conductivity Measurements

Radojković,

Jegdić,

Marunkić

et al. 2023

Met. Mater. Int.

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Microstructure Influence on Corrosion Resistance of Brazed AISI 304L/NiCrSiB Joints

Cited by 7 publications

References 28 publications

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Microstructure, Residual Stresses, and Strain-Rate-Dependent Deformation and Fracture Behavior of AISI 304L Joints Brazed with NiCrSiB Filler Metals

Influence of nitrogen content on the pit formation and pit propagation in the welded joints of X5CrNi18‐10 stainless steel

Non-Destructive Evaluation of the AISI 304 Stainless Steel Susceptibility to Intergranular Corrosion by Electrical Conductivity Measurements

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