Enhancement of mechanical properties and failure mechanism of electron beam welded 300M ultrahigh strength steel joints

Zhang, Guodong; Yang, Xinqi; He, Xinlong; Li, Jinwei; Hu, Haichao

doi:10.1016/j.matdes.2012.09.004

Cited by 34 publications

(13 citation statements)

References 25 publications

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“…The studies of 300M steel welded joints showed that the microstructure of the weld is composed of bainite, ferrite and primary austenite, whereas the heat affected zone is composed of ferrite and cementite. The strength of welded joints after tempering was 1900 MPa [15]. In the case of the 2N11K13H3M and N19M4T steels it was found that after an additional heat treatment of welded joints the microstructure of weld was uniform.…”

Section: Introductionmentioning

confidence: 93%

“…However, electron beam welding was used to join 2N11K13H3M and N19M4T maraging steels [14] and 300M-type steel used in the aerospace industry [15]. The studies of 300M steel welded joints showed that the microstructure of the weld is composed of bainite, ferrite and primary austenite, whereas the heat affected zone is composed of ferrite and cementite.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural and Mechanical Characterization of Electron Beam Welded Joints of High Strength S960QL and Weldox 1300 Steel Grades

Błacha¹,

Węglowski²,

Dymek³

et al. 2017

Archives of Metallurgy and Materials

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The paper shows the results of metallographic examination and mechanical properties of electron beam welded joints of quenched and tempered S960QL and Weldox 1300 steel grades. The aim of this study was to examine the feasibility of producing good quality electron beam welded joints without filler material.Metallographic examination revealed that the concentrated electron beam significantly affects the changes of microstructure in the weld and the adjacent heat affected zone (HAZ) in both steel grades. The microstructure of the welded joints is not homogeneous. The four zones, depending on the distance from the weld face, can be distinguished. Basically, the microstructure of the weld consists of a mixture of martensite and bainite. However, the microstructure of HAZ depends on the distance from the fusion line. It is composed of martensite near the fusion line and a mixture of bainite and ferrite in the vicinity of the base material.Significant differences in mechanical properties of the welded joints were observed. For a butt welded joint of the S960QL steel grade the strength is at the level of the strength of the base material (R m = 1074 MPa). During the bending test the required angle of 180° was achieved. The impact strength at -40°C was 71,7 J/cm 2 . In the case of the Weldox 1300 steel grade butt welded joints exhibit high mechanical properties (R m = 1470 MPa), however, the plastic properties are on the lower level than for the base material.Keywords: electron beam welding, high strength quenched and tempered steel, weld microstructure

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Microstructural and Mechanical Characterization of Electron Beam Welded Joints of High Strength S960QL and Weldox 1300 Steel Grades

Błacha¹,

Węglowski²,

Dymek³

et al. 2017

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

show abstract

“…The fusion zone consists of coarse columnar dendritic grains, which are oriented perpendicular to the fusion boundary. Since the rate of heat extraction is maximum in the direction perpendicular to the fusion boundary, the grains tend to grow in that direction, resulting in a columnar grain structure in the fusion zone [18,19]. Different sub-zones within the HAZ experience different peak temperatures during the welding thermal cycle, owing to differences in distance from the weld centerline.…”

Section: Macrostructuresmentioning

confidence: 99%

Microstructure and mechanical properties of laser welded S960 high strength steel

et al. 2015

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“…The fusion zone consists of coarse columnar dendritic grains which are aligned in a direction that is perpendicular to the fusion boundary. The direction of maximum heat flow is perpendicular to the fusion boundary, so grains tend to grow fastest in that direction, which results in columnar grains in the fusion zone [25,26]. Under higher magnification in an optical microscope, it was observed that the grain size varied with distance from the weld centre line.…”

Section: Macrostructure Characteristicsmentioning

confidence: 99%

Microstructure and mechanical characteristics of a laser welded joint in SA508 nuclear pressure vessel steel

Guo

Dong

Francis

et al. 2015

Materials Science and Engineering: A

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a b s t r a c t SA508 steels are typically used in civil nuclear reactors for critical components such as the reactor pressure vessel. Nuclear components are commonly joined using arc welding processes, but with design lives for prospective new build projects exceeding 60 years, new welding technologies are being sought. In this exploratory study, for the first time, autogenous laser welding was carried out on 6 mm thick SA508 Cl.3 steel sheets using a 16 kW fiber laser system operating at a power of 4 kW. The microstructure and mechanical properties (including microhardness, tensile strength, elongation, and Charpy impact toughness) were characterized and the microstructures were compared with those produced through arc welding. A three-dimensional transient model based on a moving volumetric heat source model was also developed to simulate the laser welding thermal cycles in order to estimate the cooling rates included by the process. Preliminary results suggest that the laser welding process can produce welds that are free of macroscopic defects, while the strength and toughness of the laser welded joint in this study matched the values that were obtained for the parent material in the as-welded condition.

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Enhancement of mechanical properties and failure mechanism of electron beam welded 300M ultrahigh strength steel joints

Cited by 34 publications

References 25 publications

Microstructural and Mechanical Characterization of Electron Beam Welded Joints of High Strength S960QL and Weldox 1300 Steel Grades

Microstructural and Mechanical Characterization of Electron Beam Welded Joints of High Strength S960QL and Weldox 1300 Steel Grades

Microstructure and mechanical properties of laser welded S960 high strength steel

Microstructure and mechanical characteristics of a laser welded joint in SA508 nuclear pressure vessel steel

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