scholarly journals Microstructure Study of Pulsed Laser Beam Welded Oxide Dispersion-Strengthened (ODS) Eurofer Steel

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 629
Author(s):  
Jia Fu ◽  
Ian Richardson ◽  
Marcel Hermans
Keyword(s):  
Grain Size ◽  
Laser Beam ◽  
Fusion Zone ◽  
Pulsed Laser ◽  
Oxide Dispersion Strengthened ◽  
Filler Material ◽  
Oxide Dispersion ◽  
Nano Oxide ◽  
Oxide Particles ◽  
Pulsed Laser Beam

Oxide dispersion-strengthened (ODS) Eurofer steel was laser welded using a short pulse duration and a designed pattern to minimise local heat accumulation. With a laser power of 2500 W and a duration of more than 3 ms, a full penetration can be obtained in a 1 mm thick plate. Material loss was observed in the fusion zone due to metal vaporisation, which can be fully compensated by the use of filler material. The solidified fusion zone consists of an elongated dual phase microstructure with a bimodal grain size distribution. Nano-oxide particles were found to be dispersed in the steel. Electron backscattered diffraction (EBSD) analysis shows that the microstructure of the heat-treated joint is recovered with substantially unaltered grain size and lower misorientations in different regions. The experimental results indicate that joints with fine grains and dispersed nano-oxide particles can be achieved via pulsed laser beam welding using filler material and post heat treatment.

scholarly journals Applicability Study of Pulsed Laser Beam Welding on Ferritic–Martensitic ODS Eurofer Steel

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 736
Author(s):  
Jia Fu ◽  
Jurriaan van Slingerland ◽  
Hans Brouwer ◽  
Vitaliy Bliznuk ◽  
Ian Richardson ◽  
...  
Keyword(s):  
Laser Beam ◽  
Fusion Zone ◽  
Laser Beam Welding ◽  
Pulsed Laser ◽  
Base Material ◽  
Oxide Dispersion Strengthened ◽  
Material Loss ◽  
Pulsed Laser Beam Welding ◽  
A Minor ◽  
Pulsed Laser Beam

Pulsed laser beam welding was used successfully to join the oxide dispersion-strengthened (ODS) Eurofer steel. The joining was conducted with a laser power of 2500 W and a pulsed duration of 4 ms. With the filler material being used, a minor material loss and microvoids were observed in the joint. The microstructure of the fusion zone consists of dual phase elongated structures. The heat-affected zone has a width of around 0.06 mm with finer grains. The transmission electron microscopy observation reveals that nanoprecipitates are finely distributed in the fusion zone. The tensile strength, yield strength and elongation of the joint are slightly inferior to the base material. The fractography results reveal a typical ductile fracture. The experimental results indicate a reasonable joint from the perspective of both the microstructure and mechanical behaviour.

Microstructure and Mechanical Property of 12Cr Oxide Dispersion Strengthened Steel

2016 ◽  
Vol 35 (3) ◽  
pp. 321-325 ◽  
Author(s):  
Haijian Xu ◽  
Zheng Lu ◽  
Chunyan Jia ◽  
Hao Gao ◽  
Chunming Liu
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Hot Isostatic Pressing ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Number Density ◽  
Ods Steel ◽  
Nano Oxide ◽  
Average Grain Size ◽  
Oxide Particles

AbstractNanostructured oxide dispersion strengthened (ODS) steels with nominal compositions (wt%): Fe-12Cr-2W-0.3Ti-0.3Y2O3 were produced by mechanical alloying and hot isostatic pressing. The microstructure was characterized by means of electron microscopy (EBSD, TEM and HRTEM) and the hardness and the tensile properties at different temperatures were measured. The results showed that the ultimate tensile strength of the fabricated 12Cr-ODS steel reached nearly 1,100 MPa at room temperature and maintained around 340 MPa at 700°C. Nano-oxide particles with size ranging from several nm to 30 nm and the number density was 3.6 × 1020/m3 were observed by TEM. Following heat treatment, including normalizing at 1,100°C for 1 h and tempering at 750°C for 2 h, the average grain size was a little decreased. The number of nano-oxide particles increased and the number density was 8.9 × 1020/m3. Specimens showed much higher ductility and there was a slight increase of ultimate tensile strength and Vickers hardness at the same time.

scholarly journals ODS EUROFER Steel Strengthened by Y-(Ce, Hf, La, Sc, and Zr) Complex Oxides

Metals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1148 ◽  
Author(s):  
Roman Husák ◽  
Hynek Hadraba ◽  
Zdeněk Chlup ◽  
Milan Heczko ◽  
Tomáš Kruml ◽  
...  
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Complex Oxides ◽  
Oxide Dispersion Strengthened ◽  
Interparticle Spacing ◽  
Oxide Dispersion ◽  
Strengthening Effect ◽  
Dispersion Strengthening ◽  
Doping Element ◽  
Average Grain Size

Oxide dispersion-strengthened (ODS) materials contain homogeneous dispersions of temperature-stable nano-oxides serving as obstacles for dislocations and further pinning of grain boundaries. The strategy for dispersion strengthening based on complex oxides (Y-Hf, -Zr, -Ce, -La) was developed in order to refine oxide dispersion to enhance the dispersion strengthening effect. In this work, the strengthening of EUROFER steel by complex oxides based on Y and elements of the IIIB group (lanthanum, scandium) and IVB group (cerium, hafnium, zirconium) was explored. Interparticle spacing as a dispersoid characteristic appeared to be an important factor in controlling the dispersion strengthening contribution to the yield strength of ODS EUROFER steels. The dispersoid size and average grain size of ODS EUROFER steel were altered in the ranges of 5–13 nm and 0.6–1.7 µm, respectively. Using this strategy, the yield strength of the prepared alloys varied between 550 MPa and 950 MPa depending on the doping element.

Quasi-one-dimensional thermal deformation and displacement of the surface of a solid in a pulsed laser beam

1997 ◽  
Vol 39 (12) ◽  
pp. 1985-1988
Author(s):  
S. V. Vintsents ◽  
S. G. Dmitriev ◽  
K. I. Spiridonov
Keyword(s):  
Laser Beam ◽  
Thermal Deformation ◽  
Pulsed Laser ◽  
One Dimensional ◽  
Pulsed Laser Beam

scholarly journals Growth of oxide particles in FeCrAl- oxide dispersion strengthened steels at high temperature

2017 ◽  
Vol 493 ◽  
pp. 180-188 ◽  
Author(s):  
N.H. Oono ◽  
S. Ukai ◽  
S. Hayashi ◽  
S. Ohtsuka ◽  
T. Kaito ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Oxide Particles

High precision balanced mode polarimetry with a pulsed laser beam

1995 ◽  
Vol 119 (3-4) ◽  
pp. 403-414 ◽  
Author(s):  
M. Bouchiat ◽  
D. Chauvat ◽  
J. Guéna ◽  
Ph. Jacquier ◽  
M. Lintz ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Precision ◽  
Pulsed Laser ◽  
Pulsed Laser Beam
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