Strength of 444 Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Kemmenoe, David J.; Theisen, Eric; Baker, Shefford P.

doi:10.1007/s11661-022-06601-9

Cited by 8 publications

(17 citation statements)

References 13 publications

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“…In Figure 2, r UTS = 566 and 402 MPa for brazed 316L and 444 stainless steel SLJs respectively. [22] Third, the transition from one line of the 'two-line' behavior to the other does not correlate with a change in failure mode. In Figure 2, all of the 316L samples failed by peeling while all of the 444 samples failed in the base metal.…”

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confidence: 91%

“…In previous work, we investigated the tensile strength of 316L [9] and 444 [22] stainless steel SLJs brazed with two different corrosion-resistant amorphous braze filler metals. We used two different braze time/temperature cycles and made SLJs over the range 0.5 [ o/t [ 12.…”

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confidence: 99%

“…As per AWS C3.2, [4] we found 'two-line' r UTS vs. o/t behavior in our experiments. [9,22] Examples from 316L and 444 SLJs brazed with the same braze filler metal under identical braze conditions are shown in Figure 2. We also found both braze and base-metal failures, but showed that braze failures divide into fast fracture and stable crack propagation, leading to three distinct failure modes.…”

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confidence: 99%

“…In the absence of a more complete stress analysis, we interpreted our results based on a qualitative analysis of the features of the stress distributions acting on the braze [9,22] that must be true based on G&R, [10] the adhesive SLJ literature, [1,2,6,15,16,[23][24][25] and the limited work that has been done to characterize stress distributions in brazed/monolithic SLJs beyond G&R (e.g. References 11 through 14,17,18).…”

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confidence: 99%

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Stress Distributions in Brazed Single-Lap Joints Under Tensile Loading

Kemmenoe

Baker

2023

Metall Mater Trans A

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The most common method for characterizing the strength of brazed joints is uniaxial tension testing of single lap joints (SLJs). Standard interpretations depend on the assumption that the average shear stress at failure is the key metric in determining joint strength. However, it is evident from the geometry that the stress distributions must be inhomogeneous with shear lag type stress concentrations at the ends of the overlap regions. Eccentric loading causes overlap rotation and bending stresses that amplify the stress concentrations and result in geometric nonlinearity. Unfortunately, details of the distributions of normal and shear stresses on the braze needed to understand failure have not been presented. Thus, finite element analysis was used to quantify these stress distributions using 2D elastic and elasto-plastic models of monolithic stainless steel SLJs. Bending stresses and normal and shear stresses acting on the braze were determined over a wide range of overlap ratios and applied stresses. For all conditions, stresses are highly concentrated in a narrow region at overlap ends with peak normal stresses exceeding peak shear stresses. Variations in peak stresses with applied stress and overlap ratio were found to fully explain experimental joint strength data. Common interpretations based on the average shear stress at failure are found to be incorrect. Implications for testing, interpretation, and joint design are discussed.

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confidence: 99%

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Stress Distributions in Brazed Single-Lap Joints Under Tensile Loading

Kemmenoe

Baker

2023

Metall Mater Trans A

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“…However, the brazed joint is still the weakest part of the whole component and sometimes the brazed structure could undergo unexpected failure. For example, there are intermetallic compounds in the brazed seam and the voids will appear in it due to unsuitable parameters [ 24 , 25 , 26 ], thus the defects in the joints can expand rapidly after the high temperature and high strain processes [ 27 , 28 ]. Among them, Mn-based brazing filler can meet the high-temperature service conditions of stainless steel brazed joints due to its good weldability and excellent high-temperature mechanical properties [ 29 ].…”

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confidence: 99%

Interfacial Microstructure and Mechanical Properties of 1Cr18Ni9Ti/1Cr21Ni5Ti Stainless Steel Joints Brazed with Mn-Based Brazing Filler

Chen

Chen²,

Yang³

et al. 2022

Materials

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The problem of stainless steel brazing is still the focus of scientific research. In this work, the Mn-based brazing filler was used to braze 1Cr18Ni9Ti and 1Cr21Ni5Ti stainless steel. The typical microstructure of the 1Cr18Ni9Ti/1Cr21Ni5Ti joint was analyzed in detail, and the interface structure of the joint was determined to be 1Cr18Ni9Ti/Mn(s, s)/1Cr21Ni5Ti. The brazing temperature and holding time were shown to have a great influence on the microstructure of the brazed joint. The tensile strength of brazed joints first increased and then decreased with the rising of the brazing temperature and the holding time. The maximum tensile strength was 566 MPa when the joints were brazed at 1125 °C for 15 min. The diffusion of Mn and Cr was an important factor affecting the quality of the joints. The diffusion distances of Mn and Cr at different brazing temperatures and holding times were measured, and the diffusion activation energy and diffusion coefficient were achieved by the Arrhenius equation.

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A Boron-Free Ni-25Cr-6P-3Si Amorphous Brazing Foil with a Melting Temperature of 985 °C

Bizen

2023

J. of Materi Eng and Perform

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Strength of 444 Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Cited by 8 publications

References 13 publications

Stress Distributions in Brazed Single-Lap Joints Under Tensile Loading

Stress Distributions in Brazed Single-Lap Joints Under Tensile Loading

Interfacial Microstructure and Mechanical Properties of 1Cr18Ni9Ti/1Cr21Ni5Ti Stainless Steel Joints Brazed with Mn-Based Brazing Filler

A Boron-Free Ni-25Cr-6P-3Si Amorphous Brazing Foil with a Melting Temperature of 985 °C

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