Understanding low cycle fatigue and creep–fatigue interaction behavior of 316 L(N) stainless steel weld joint

Shankar, Vani; Mariappan, K.; Sandhya, R.; Laha, K.

doi:10.1016/j.ijfatigue.2015.09.003

Cited by 44 publications

(7 citation statements)

References 31 publications

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“…Typical engineering stress-strain curves are illustrated in Figure 9, and the numbers from 1 to 11 in the figure represent the number of the specimens. It could be obviously found that most of the test samples show a tensile strength of about 500 MPa, which was close to that of the substrate material (Shankar et al, 2016). Test sample cut from specimen S10 illustrates the highest tensile strength and the sample cut from S2 and S9 shows the highest elongation.…”

Section: Tensile Results and Fracture Characteristicsmentioning

confidence: 55%

Quick butt welding of steel sheets using the high-speed laser cladding method

Liu²,

Shen³

et al. 2022

Front. Mater.

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Laser butt welding of thin steel sheets without filler material was widely used in many industrial fields. However, it was very difficult to focus the small laser spot on the narrow gap between the sheets during the laser butt welding process. In this study, a new method to weld thin steel sheets using a high-speed laser cladding technique is proposed. Stainless steel sheets with a thickness of 0.5 mm were welded using the high-speed laser cladding process. The results illustrated that good weld joints could be obtained without obvious cracks and pores in most of the specimens. The joints were well formed even if the sheets were not spliced together entirely. The average tensile strength of the specimens was about 500 MPa, which is almost the same as that of the substrate. The results also showed that most of the failures did not happen in the welding region, which could be concluded that the strength of joints was higher than that of the substrate. The microstructure was determined using an optical microscope (OM) and scanning electron microscope (SEM). The results showed that it may be a good choice to use the high-speed laser cladding technique for butt welding of stainless steel sheets.

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Section: Tensile Results and Fracture Characteristicsmentioning

confidence: 55%

Quick butt welding of steel sheets using the high-speed laser cladding method

Liu²,

Shen³

et al. 2022

Front. Mater.

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“…This unaccumulated plastic strain balances by forming cavities or new surfaces of cracks in the austenitic matrix in the FZ. 39 Further, the microstructure of fatigue fracture specimens was examined to confirm the failure location at different stress amplitudes. For the specimens tested with 150 MPa and 175 MPa stress amplitude, the failure location was approximately 0.97 mm away from the fusion boundary in the FZ, as illustrated in Figures 8(b) and (c).…”

Section: Failure Location Of Fatigue Test Specimenmentioning

confidence: 99%

Study on the microstructural variation and fatigue performance of microplasma arc welded thin 316L sheet

Saha

Pal

2021

Proceedings of the Institution of Mechanical Engineers, Part L:

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Welding is a venerable and reliable fabricating technique to integrate materials into complex geometry desired for various industrial applications. However, localized heat concentration leading to microstructural variations can deteriorate the fatigue life of welded components. The present study explains tensile and high cycle fatigue performance of microplasma arc welded 316L SS thin sheet (0.5 mm thickness) material. The square butt joint configuration with a single pass weld was achieved for 316L SS similar sheet material. The skeletal and lathy delta-ferrite-austenitic structures were observed in the fusion zone (FZ) due to non-equilibrium solidification, which is attributed to the different thermal cycle behaviour of the FZ. This morphology is explained by the pseudo phase diagram and the Schaeffler diagram of SS material. The tensile test showed that the microplasma arc welding process achieved a joining efficiency of 93%. The high cycle fatigue performance of welded specimens was analysed at different alternating stress amplitude. The presence of a dense delta ferrite phase in the austenitic matrix is responsible for fatigue failure of the welded specimen. However, the development of deformation-induced martensite in the crack initiation site promotes fatigue life. The crack initiation, propagation, and sudden failure site were investigated to explain the fatigue fracture behaviour.

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“…A number of parameters such as the strain rate or strain amplitude have a significant influence on LCF behavior [ 9 , 10 ]. In addition, defects and the near-surface microstructure in particular have a significant influence on LCF fatigue properties.…”

Section: Introductionmentioning

confidence: 99%

Separation of Damage Mechanisms in Full Forward Rod Extruded Case-Hardening Steel 16MnCrS5 Using 3D Image Segmentation

Lingnau,

Heermant,

Otto

et al. 2024

Materials

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In general, formed components are lightweight as well as highly economic and resource efficient. However, forming-induced ductile damage, which particularly affects the formation and growth of pores, has not been considered in the design of components so far. Therefore, an evaluation of forming-induced ductile damage would enable an improved design and take better advantage of the lightweight nature as it affects the static and dynamic mechanical material properties. To quantify the amount, morphology and distribution of the pores, advanced scanning electron microscopy (SEM) methods such as scanning transmission electron microscopy (STEM) and electron channeling contrast imaging (ECCI) were used. Image segmentation using a deep learning algorithm was applied to reproducibly separate the pores from inclusions such as manganese sulfide inclusions. This was achieved via layer-by-layer ablation of the case-hardened steel 16MnCrS5 (DIN 1.7139, AISI/SAE 5115) with a focused ion beam (FIB). The resulting images were reconstructed in a 3D model to gain a mechanism-based understanding beyond the previous 2D investigations.

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Understanding low cycle fatigue and creep–fatigue interaction behavior of 316 L(N) stainless steel weld joint

Cited by 44 publications

References 31 publications

Quick butt welding of steel sheets using the high-speed laser cladding method

Quick butt welding of steel sheets using the high-speed laser cladding method

Study on the microstructural variation and fatigue performance of microplasma arc welded thin 316L sheet

Separation of Damage Mechanisms in Full Forward Rod Extruded Case-Hardening Steel 16MnCrS5 Using 3D Image Segmentation

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