Varied sub-grain microstructure impacts fracture behavior and resistance in 316LN weld metal

Keshun, Dai; Zhu, Li; Xiao, Wenkai; Chen, Fangyu; Fu-ju, Zhang; Xue, Yunfei; Kunqi, Mudi; Xian, Zhai; Zhang, Mingxiang

doi:10.1016/j.engfracmech.2017.02.025

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…This was attributed to the increased aging time and the rise in carbide content to 7.89% [34]. The carbide at the grain boundaries grew to 13.03% when the aging time was increased to 200 h, and the intergranular rupture revealed a brittle fracture in the shape of icing sugar, with tiny and shallow tough nests dispersed over the crystal surface [35], as shown in Figure 6d. The tough nests nearly vanished completely as the aging time rose to 300 and 500 h, and the icing sugar-like structures became more visible (Figure 6e-f), since the intergranular carbide concentration was approximately 19% at this time.…”

Section: Charpy Impact and Hbw Hardness Testmentioning

confidence: 94%

Effect of Microstructure on Mechanical Properties of 316 LN Austenitic Stainless Steel

2022

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The microstructure development of 316 LN austenitic stainless steel (316 LNSS) during the aging process is investigated in this article. The thermal aging processes were conducted at 750 °C with different periods ranging from 50 to 500 h. The metallographic results show that the coherent and incoherent twins were present in the original 316 LNSS grains, but dwindled as the aging period increased. After 50 h of aging, many fine, dispersed particles precipitated from the matrix, which were identified as M23C6 by energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). Additionally, the impact toughness and Brinell hardness (HBW) changed during the aging, which was closely related to the effects of dispersion strengthening and solution strengthening. A negatively linear relationship between Brinell hardness and Charpy impact energy was established, which could be utilized to predict the degree of thermal embrittlement.

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Section: Charpy Impact and Hbw Hardness Testmentioning

confidence: 94%

Effect of Microstructure on Mechanical Properties of 316 LN Austenitic Stainless Steel

2022

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Impact Toughness and Fracture Structure about Welded Joints of Low Chromium Nickel Ferritic Stainless Steel Containing Ce/Ti

Meng

Fan

Guo

2019

steel research int.

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In order to improve the impact toughness and reduce inclusion, rare earth element Ce and stable element Ti are added in the low chromium nickel ferritic stainless steel welded joints and heat treatment. The Charpy test and tensile test are carried out and fracture structure are analyzed. The results show that when the ratio of Ce is 0.24% and Ti is 0.72% in welded joints of ferritic stainless steel, the mechanical properties is the best. The impact energy of welded joint is 9.4 times more than the samples without Ce and Ti, the impact toughness is also increased by 123.6% after heat treatment and the tensile strength increases by 41.9% The fracture structure is main ductile fracture and dimple, the shape of dimples is parabolic. The dimple is large and deep, and in the bottom of dimple has second phase particles. There is a few cleavage facets and river patterns in the fracture. After thermal cycling, the number of oxide particles reduce and the second phase particles are refined, so the impact toughness is improved.

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Axial-torsional high-cycle fatigue of both coarse-grained and nanostructured metals: A 3D cohesive finite element model with uncertainty characteristics

Sun

Guo

Weng

et al. 2018

Engineering Fracture Mechanics

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Varied sub-grain microstructure impacts fracture behavior and resistance in 316LN weld metal

Cited by 4 publications

References 21 publications

Effect of Microstructure on Mechanical Properties of 316 LN Austenitic Stainless Steel

Effect of Microstructure on Mechanical Properties of 316 LN Austenitic Stainless Steel

Impact Toughness and Fracture Structure about Welded Joints of Low Chromium Nickel Ferritic Stainless Steel Containing Ce/Ti

Axial-torsional high-cycle fatigue of both coarse-grained and nanostructured metals: A 3D cohesive finite element model with uncertainty characteristics

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