The impact of transformation plasticity on the electron beam welding of thick-section ferritic steel components

Low pressure electron beam welding offers the prospect of large increases in productivity for thick section welds in RPV steels. However, it is important to understand how this welding process affects the structural performance of the completed weld. This paper reviews and presents key results from a programme of weldment manufacture, materials characterisation, residual stress measurements, and finite element modelling of EB welds made in plate of three thicknesses, 30mm, 130mm, and 200mm, and in three steels: SA508 Gr 2, SA508 Gr 3 C1 1, and SA516 Gr 70.

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Electron beam welding of Fe–Mn–Al–Ni shape memory alloy: Microstructure evolution and shape memory response

Functional Materials Letters ◽

10.1142/s1793604717500436 ◽

2017 ◽

Vol 10 (04) ◽

pp. 1750043 ◽

Cited By ~ 6

Author(s):

P. Krooß ◽

J. Günther ◽

L. Halbauer ◽

M. Vollmer ◽

A. Buchwalder ◽

...

Keyword(s):

Heat Treatment ◽

Electron Beam ◽

Shape Memory Alloy ◽

Shape Memory ◽

Electron Beam Welding ◽

Eb Welding ◽

Cyclic Heat Treatment ◽

Memory Response ◽

Cyclic Heat ◽

The Impact

The present study reports on the impact of abnormal grain growth (AGG) on the microstructural evolution following electron beam (EB) welding of Fe–Mn–Al–Ni shape memory alloy (SMA). Polycrystalline sheet-like material was EB-welded and a cyclic heat treatment, studied in previous work, was conducted for inducing AGG and a bamboo-like microstructure, respectively. Optical and electron microscopy were carried out to characterize the prevailing microstructure upon cyclic heat treatment. For characterization of the functional properties following AGG, a load increase test was conducted. The current results clearly show that good shape memory response can be obtained in Fe–Mn–Al–Ni SMA upon EB welding and subsequent post-heat treatment. These results further substantiate the potential use of conventional processing routes for Fe–Mn–Al–Ni SMA.

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Microstructure and properties of Co3W2 heat-resistant steel by vacuum electron beam welding

International Journal of Modern Physics B ◽

10.1142/s0217979220400585 ◽

2019 ◽

Vol 34 (01n03) ◽

pp. 2040058

Author(s):

Youyi Zhang ◽

Guoqing Gou

Keyword(s):

Tensile Strength ◽

Electron Beam ◽

High Temperature ◽

Weld Metal ◽

Base Metal ◽

Electron Beam Welding ◽

Resistant Steel ◽

Heat Resistant Steel ◽

Heat Resistant ◽

The Impact

12Cr10Co3W2MoNiVNbNB (Co3W2) is a new type of martensitic heat-resistant steel, which is mainly used in high-temperature dynamic, static blades, high-temperature bolts and other components of ultra-supercritical steam turbines. The Co3W2 steel was joined by vacuum electron beam welding, and the microstructures of the joints were analyzed. The hardness, tensile strength and impact toughness of the joints were investigated. The results show that the joints mainly consist of weld metal, fusion-line, heat-affected zone (HAZ) and base metal, the microstructure of the weld metal is a coarse martensite. The hardness of the weld metal is about 326 HV higher than that of the base metal, and the tensile strength of the joints is 939 MPa, which can reach 98.63% of base metal. The impact absorbed energy of weld metal is such that the weakest part of the welded joints during the impact process is about 18.5 J.

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Through Thickness Variations on Dissimilar Weldments of Austenitic Steel AISI 321 and Ferritic Steel AISI 409 Welded by Electron Beam Welding

Metallography Microstructure and Analysis ◽

10.1007/s13632-021-00783-1 ◽

2021 ◽

Author(s):

Ajay Sharma ◽

Vineet Prabhakar ◽

Sandeep Singh Sandhu

Keyword(s):

Electron Beam ◽

Austenitic Steel ◽

Ferritic Steel ◽

Electron Beam Welding ◽

Steel Aisi ◽

Thickness Variations ◽

Aisi 321

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Optimization of Electron Beam Welding Joint of Water-Cooled Ceramic Breeder Blanket

Materials ◽

10.3390/ma14123405 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3405

Author(s):

Yong Zhang ◽

Jiefeng Wu ◽

Zhihong Liu ◽

Songlin Liu ◽

Mingzhun Lei ◽

...

Keyword(s):

Electron Beam ◽

Electron Beam Welding ◽

Base Material ◽

Test Plate ◽

Welding Seam ◽

Clam Steel ◽

Δ Ferrite ◽

Fusion Engineering ◽

Test Reactor ◽

The Impact

The water-cooled ceramic breeder (WCCB) blanket is a component of the China Fusion Engineering Test Reactor (CFETR). The Reduced Activation Ferrite/Martensite (RAFM) steels are the preferred structural materials for WCCB blanket. As a kind of RAFM steels, China low activation martensitic (CLAM) steel was welded by electron beam welding (EBW), and then quenched-tempered treatment was carried out. The results show that at the welding state, the welding seam was composed of large martensite and δ ferrite and the organization of the heat-affected zone (HAZ) was changed slightly with the different heat input. Moreover, the hardness of welded joints was higher than that of base material (BM), but the impact toughness was very low. After quenched-tempered treatment, the δ ferrite in the weld was eliminated, the residual stress of the test plate decreased as a whole, and the mechanical properties were improved significantly.

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