Banding in copper friction stir weld

Savolainen, Kati; Saukkonen, Tapio; Hänninen, Hannu

doi:10.1179/1362171811y.0000000089

Cited by 21 publications

(37 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…there are no differences in hardness across the processing lines. When using the intentionally too cold processing parameters some localization of strain and increase in the nanohardness could be detected in connection with the processing lines in our earlier studies reported elsewhere [10]. Only when the processing lines are exactly marked on the FSW weld cross-section it can be surely stated, that the EBSD maps are run across the processing lines.…”

Section: Figure 7 Ebsd Maps Of the Transverse Cross-section Of The Ementioning

confidence: 65%

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Savolainen

Saukkonen²,

Hänninen³

2012

WJNST

View full text Add to dashboard Cite

Localization of plastic deformation in different parts (extruded and forged base materials as well as EB and FSW welds) of the corrosion barrier copper canister for final disposal of spent nuclear fuel was studied using tensile testing, optical strain measurement, scanning electron microscopy (SEM), and electron back-scatter diffraction (EBSD). Results show that in the base materials plastic deformation occurs very uniformly. In FSW welds the deformation localizes in the weld either at the processing line or at a line of entrapped oxide particles. In EB welds the deformation localizes to the equally oriented large grains at the weld centreline or at the steep grain size gradient in the fusion line

show abstract

Section: Figure 7 Ebsd Maps Of the Transverse Cross-section Of The Ementioning

confidence: 65%

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Savolainen

Saukkonen²,

Hänninen³

2012

WJNST

View full text Add to dashboard Cite

show abstract

“…Grain size of the base materials may also vary depending on the manufacturing method (60-75 μm) [5]. Banding of the microstructure may occur due to cold welding conditions, in which the bands consist of alternating sections of smaller and larger grains [81], but it was not observed in the canister welds. One of the core findings of ref.…”

Section: Copper Fsw Welds [Paper Ii]mentioning

confidence: 99%

Hydrogen effects on mechanical performance of nodular cast iron

2019

View full text Add to dashboard Cite

The KBS-3 method for long-term disposal of spent nuclear fuel is designed with an external self-standing copper shell, which provides the most important barrier against corrosion and escape of radionuclides, and an internal nodular cast iron insert, which provides the load-bearing structure against external loads. The material intended for the load-bearing insert is ferritic nodular cast iron EN 1563 grade EN-GJS-400-15U. In this paper, hydrogen uptake and sensitivity to hydrogen-induced cracking of the cast iron were studied using tensile testing under continuous electrochemical charging in 1 N H2SO4 solution. Hydrogen uptake was measured by using the thermal desorption method. It was found that the hydrogen desorption profile manifests three distinct peaks at initial locations of 400, 500, and 700 K with a heating rate of 6 K/min. Plastic deformation results in a remarkable increase of the 400 K peak, which indicates hydrogen uptake during deformation. In the constant extension rate tests (CERT) and the constant load tests (CLT), electrochemical hydrogen charging reduced markedly the elongation to fracture and time to fracture, respectively. In CLT, hydrogen charging increased dramatically the creep rate at the applied load of about 0.7 yield stress. Ligaments between the graphite nodules exhibit brittle cleavage facets in the presence of hydrogen, while the ligaments show a characteristic ductile appearance of shear and small dimples when testing in air or distilled water. The obtained results are discussed in terms of the known mechanisms of hydrogen-induced cracking and the role of the graphite nodules in the embrittlement of ductile cast iron.

show abstract

“…15 Most Mg-alloys can be joined by arc welding processes. 99 However, there are some difficulties in welding these alloys, especially the cast grades. The major problems encountered in welding of Mg-alloys are the presence of porosity 11,57 and the emission of large volumes of non-toxic fumes in arc welding.…”

Section: Physical Metallurgy Of Mg-alloysmentioning

confidence: 99%

Friction stir welded structural materials: beyond Al-alloys

Çam

2011

International Materials Reviews

449

124

View full text Add to dashboard Cite

The friction stir welding (FSW) technique is widely accepted to be one of the most significant welding techniques to emerge in the last 20 years. Friction stir welding of Al-alloys is now commonplace and is covered in several recent reviews, including one in this journal. Consequently, the technique is currently being used for joining of these alloys in various industrial applications. Complementary to these developments has been a dramatic increase in research into joining of other alloys and systems by FSW. This field is very active, but less mature. Thus, the aim of this review article is to build on our understanding of the fundamentals, as applied to Al-alloys that laid out in the previous review in this journal, and to address the current state-of-the-art of FSW developing beyond Al-alloys, including Mg-alloys, Cu-alloys, steels, Tialloys and metal matrix composites, focusing particularly on microstructural aspects, including texture formation, and the resulting properties of these joints. Material selection for tooling will also be covered to some extent while modelling studies of material flow during FSW are outside the scope of this paper. Finally, residual stresses are mentioned in a number of places and while these have been measured extensively for Al-alloy systems there are fewer measurements for other systems.

show abstract

Banding in copper friction stir weld

Cited by 21 publications

References 23 publications

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Localization of Plastic Deformation in Copper Canisters for Spent Nuclear Fuel

Hydrogen effects on mechanical performance of nodular cast iron

Friction stir welded structural materials: beyond Al-alloys

Contact Info

Product

Resources

About