Structural Performance of Inconel 625 Superalloy Brazed Joints

Chen, Jianqiang; Demers, Vincent; Cadotte, Eve-Line; Turner, D. P.; Bocher, Philippe

doi:10.1007/s11665-016-2491-8

Cited by 15 publications

(21 citation statements)

References 12 publications

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“…If the stress distribution is inhomogeneous, the failure load is determined by the peak stress, not the average stress. The stress distribution in SLJs is well known to be inhomogeneous [13,[15][16][17][18][19][23][24][25][26][27][28]30,31,[34][35][36][37][38][39] ; therefore, to understand the failure modes of brazed SLJs, it is necessary to understand the stress state.…”

Section: A Slj Stress Statementioning

confidence: 99%

“…Third, while the ''two-line'' behavior of r SLJ in brazed joints has been reported, [13,16,25,29] in many cases it is not observed. [13,[16][17][18][19]29] In some cases, the ''two-line'' interpretation is imposed, even though the data clearly do Fig.…”

Section: Introductionmentioning

confidence: 99%

“…[16,29] Furthermore, in the few papers that actually do report both r SLJ and the location of failure for a sufficiently wide range of o/t, it is evident that neither braze failures nor base metal failures are restricted to the segments of the curve specified in Figure 3. [13,16,25,29] While a handful of authors have acknowledged that the actual stress state in a brazed SLJ is more complicated than the simple shear considered in AWS C3.2, [16,17,19,[24][25][26] some did not utilize this knowledge in their analysis, [16,17] only a few used at least some aspects of the realistic stress state to interpret their SLJ data, [19,25,26] and even fewer included geometric nonlinearity in their analysis. [19,26] Interestingly, much work has been done to understand the actual stress state and its effects on SLJs bonded with polymer adhesives (e.g., References and 31), and we will show that much of that work can be applied directly to brazed SLJs.…”

Section: Introductionmentioning

confidence: 99%

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Strength of 316L Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Kemmenoe

Theisen

Baker

2021

Metall Mater Trans A

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In brazing, the choice of base metal, brazing filler metal (BFM), and braze process conditions involves complex tradeoffs among cost, mechanical strength, corrosion resistance, and others. In this work, the tradeoff between strength and corrosion resistance of 316L stainless steel joints brazed with a newer ''very corrosion-resistant'' Ni-Cr-P-Mo-Si BFM and a more established ''corrosion-resistant'' Ni-Cr-Si-B BFM is quantitatively analyzed. Corrosion tests and microstructural analyses were performed using common practices. Joint strength was evaluated by testing brazed single-lap joints (SLJs) in tension following standardized procedures. However, conventional interpretations were found to be inadequate for quantitative comparisons. Therefore, the SLJ stress state was analyzed in detail and a complete interpretation was developed. Joint strength is shown to be determined by the SLJ geometry, base metal properties, and braze microstructure. This analysis was used to explain the occurrence of different failure modes (fast fracture, peeling, and base metal failure) and to make suggestions for improved methods for conducting and analyzing brazed SLJ tensile tests. The newer BFM is shown to provide significantly better corrosion resistance for a moderate reduction in mechanical strength.

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Section: A Slj Stress Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strength of 316L Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Kemmenoe

Theisen

Baker

2021

Metall Mater Trans A

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“…Several reconstruction parameters were tested in order to improve the signal-to-noise ratio and correct both beam-hardening effects and ring artifacts. The defects were segmented and analyzed with the open source image analysis programs Fiji [4] and Icy [5].…”

Section: Xct Characterization 221 Acquisition Parametersmentioning

confidence: 99%

“…In the case of brazed materials, limiting the occurrence of defects such as cavities and precipitates in joints is a challenge for their in-service integrity. The presence of precipitates has received a lot of attention and brazing processes have been optimized to minimize their size or their presence [1][2][3] in order to maximize the static and fatigue mechanical properties of the joint [4][5][6][7][8]. However, the presence of porosities within the joint can also severely lower the mechanical strength of the welded assembly [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Vanderesse

Texier

Bocher

2020

Materials Characterization

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A quantitative investigation of the porosity and its effects on mechanical properties was conducted on brazed materials presenting macroscopically brittle behavior with various defect levels. Three different techniques for evaluating the porosity and the fracture mechanisms were compared: (i) pre-mortem X-ray computed tomography (XCT), (ii) post-mortem laser scanning confocal microscopy (LSCM), and (iii) post-mortem scanning electron microscopy (SEM). The apparent surface area of the pores was evaluated by segmenting the height maps produced by LSCM and the electron backscattered images produced by SEM. The results show good agreement for different porosity levels. The LSCM height maps for opposite fracture faces were virtually stitched together in order to reconstruct three-dimensional (3D) images of the whole brazed joints. These proved to be similar to the XCT 3D segmented images, yet with some discrepancies due to local plastic deformation. Quantitative volume fraction and spatial distribution of pores were assessed as well as the identification of fracture mechanisms. Interestingly, it was noted that two specimens with different ultimate tensile strengths presented the same porosity amount, but different distributions. Two distinctive features were identified in the broken specimens: plastically teared pillars and walls that were separating the pores before fracture, and plateaus of approximately constant height with micro-sized dimples showing interfacial fracture. Although the specimens exhibited a macroscopic brittle behavior, these features are characteristic of ductile fracture. The most probable scenario for fracture was conjectured as follows: (i) Final fracture occurs in the near-surface region of the samples and conversely early damage develops in the volume, (ii) Interfacial fracture within plateaus is responsible of the rupture/strength of the brazed specimen but detrimental effect is induced by the tearing if highly voided regions are present in the joint.

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Experimental Investigation on High-Cycle Fatigue of Inconel 625 Superalloy Brazed Joints

Chen

Demers

Turner³

et al. 2018

Metall Mater Trans A

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Structural Performance of Inconel 625 Superalloy Brazed Joints

Cited by 15 publications

References 12 publications

Strength of 316L Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Strength of 316L Stainless Steel Single-Lap Joints Brazed with Ni-Based Metallic Glass Foils for Corrosive Environments

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Experimental Investigation on High-Cycle Fatigue of Inconel 625 Superalloy Brazed Joints

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