scholarly journals Effect of Hot Rolling on the Microstructure and Properties of Nanostructured 15Cr ODS Alloys with Al and Zr Addition

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3695
Author(s):  
Zhengyuan Li ◽  
Lijia Chen ◽  
Haoyu Zhang ◽  
Siqian Zhang ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Hot Rolling ◽  
Hot Isostatic Pressing ◽  
Oxide Dispersion Strengthened ◽  
Large Strains ◽  
High Temperature Strength ◽  
Oxide Dispersion ◽  
Excellent Thermal Stability ◽  
Zr Addition ◽  
Ods Alloys ◽  
Effect Of Hot Rolling

Oxide dispersion strengthened (ODS) alloys with Al and Zr addition have excellent radiation tolerance, high-temperature strength, and corrosion resistance. The 15Cr-Al-Zr-ODS alloys are processed by mechanical alloying (MA), hot isostatic pressing (HIP), subsequent hot rolling to large strains of 70%, and further annealing. The effect of hot rolling on the microstructure, and the properties of nanostructured 15Cr ODS alloys with Al and Zr addition, were investigated. The microstructure after hot rolling and annealing showed obvious anisotropy. The cubic texture (φ1 = 0°, Φ = 0°, φ2 = 0°) {0 0 1} <1 0 0> and brass-R texture (φ1 = 0°, Φ = 55°, φ2 = 45°) {1 1 1} <1 1 0> were observed. The similar size distribution of precipitates was obtained for the comparison of the hot rolling samples with the hot isostatic pressed samples, which can be attributed to excellent thermal stability. After hot rolling, the alloy showed higher yield strength but did not lose too much plasticity.

Selective Laser Melting of Oxide Dispersion Strengthened Steels

2011 ◽  
Author(s):  
Thomas Boegelein ◽  
Ashwin Rao ◽  
Andrew R. Jones ◽  
Gordon J. Tatlock
Keyword(s):  
Selective Laser Melting ◽  
Elevated Temperatures ◽  
Prolonged Exposure ◽  
Steel Substrate ◽  
Oxide Dispersion Strengthened ◽  
Nickel Base Superalloy ◽  
High Temperature Strength ◽  
Oxide Dispersion ◽  
Laser Melting ◽  
Ods Alloys

Oxide Dispersion Strengthened (ODS) alloys are a long established class of materials manufactured using powder metallurgy techniques. These alloys can offer exceptional high temperature strength and resistance to radiation damage, thus are envisioned to be used in a number of future nuclear and fossil energy power applications. However, due to the manufacturing steps involved, the overall cost to build components with these materials can be high. This paper presents work conducted to assess the feasibility of applying Selective Laser Melting (SLM) techniques to either coat or direct build on substrates with Fe-based Oxide Dispersion Strengthened (ODS) alloys. SLM is a rapid prototyping technique which can be used to manufacture near net-shape solid components from layered metallic powder beds. Two different geometries were of interest in this study — a simple button configuration with a nickel-base superalloy (IN939) substrate and a more complex hexagonal shaped wall with a mild steel substrate. Powders of PM2000 (a FeCrAl based ODS alloy) were deposited in both cases. Heat treatments were subsequently conducted on these structures to investigate effects of temperature on the bond characteristics and secondary recrystallisation. Electron microscopy examination revealed significant amounts of diffusion between the nickel and the ODS powders which enhances the bond strength. The studies have revealed the existence of a strong bond between the substrate and the interface even after prolonged exposure at elevated temperatures.

scholarly journals Microstructure and Mechanical Properties of 14Cr-ODS Steels with Zr Addition

2019 ◽  
Vol 38 (2019) ◽  
pp. 404-410 ◽  
Author(s):  
Weijuan Li ◽  
Haijian Xu ◽  
Xiaochun Sha ◽  
Jingsong Meng ◽  
Zhaodong Wang
Keyword(s):  
Mechanical Properties ◽  
Hot Isostatic Pressing ◽  
Oxide Dispersion Strengthened ◽  
Nominal Composition ◽  
Ods Steel ◽  
Zr Addition ◽  
Microstructure And Mechanical Properties ◽  
The Matrix ◽  
Ods Steels ◽  
The Impact

AbstractIn this study, oxide dispersion strengthened (ODS) ferritic steels with nominal composition of Fe–14Cr–2W–0.35Y2O3 (14Cr non Zr-ODS) and Fe–14Cr–2W–0.3Zr–0.35Y2O3 (14Cr–Zr-ODS) were fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP) technique to explore the impact of Zr addition on the microstructure and mechanical properties of 14Cr-ODS steels. Microstructure characterization revealed that Zr addition led to the formation of finer oxides, which was identified as Y4Zr3O12, with denser dispersion in the matrix. The ultimate tensile strength (UTS) of the non Zr-ODS steel is about 1201 MPa, but UTS of the Zr-ODS steel increases to1372 MPa, indicating the enhancement of mechanical properties by Zr addition.

scholarly journals Effect of Helium on Dispersoid Evolution under Self-Ion Irradiation in A Dual-Phase 12Cr Oxide-Dispersion-Strengthened Alloy

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3343 ◽  
Author(s):  
Hyosim Kim ◽  
Tianyao Wang ◽  
Jonathan G. Gigax ◽  
Shigeharu Ukai ◽  
Frank A. Garner ◽  
...  
Keyword(s):  
High Temperature ◽  
Ion Irradiation ◽  
Critical Mass ◽  
Control Sample ◽  
Oxide Dispersion Strengthened ◽  
Future Generation ◽  
High Temperature Strength ◽  
Oxide Dispersion ◽  
Dual Phase ◽  
Peak Displacement

As one candidate alloy for future Generation IV and fusion reactors, a dual-phase 12Cr oxide-dispersion-strengthened (ODS) alloy was developed for high temperature strength and creep resistance and has shown good void swelling resistance under high damage self-ion irradiation at high temperature. However, the effect of helium and its combination with radiation damage on oxide dispersoid stability needs to be investigated. In this study, 120 keV energy helium was preloaded into specimens at doses of 1 × 1015 and 1 × 1016 ions/cm2 at room temperature, and 3.5 MeV Fe self-ions were sequentially implanted to reach 100 peak displacement-per-atom at 475 °C. He implantation alone in the control sample did not affect the dispersoid morphology. After Fe ion irradiation, a dramatic increase in density of coherent oxide dispersoids was observed at low He dose, but no such increase was observed at high He dose. The study suggests that helium bubbles act as sinks for nucleation of coherent oxide dispersoids, but dispersoid growth may become difficult if too many sinks are introduced, suggesting that a critical mass of trapping is required for stable dispersoid growth.

Effect of hot-rolling and cooling rate on microstructure and high-temperature strength in 9CrODS steel

2013 ◽  
Vol 440 (1-3) ◽  
pp. 553-556 ◽  
Author(s):  
XCH. Wu ◽  
S. Ukai ◽  
R. Miyata ◽  
N. Oono ◽  
S. Hayashi ◽  
...  
Keyword(s):  
High Temperature ◽  
Cooling Rate ◽  
Hot Rolling ◽  
High Temperature Strength ◽  
Effect Of Hot Rolling

scholarly journals Structure and mechanical properties of Fe–Ni–Zr oxide-dispersion-strengthened (ODS) alloys

2015 ◽  
Vol 467 ◽  
pp. 205-213 ◽  
Author(s):  
K.A. Darling ◽  
M. Kapoor ◽  
H. Kotan ◽  
B.C. Hornbuckle ◽  
S.D. Walck ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Ods Alloys
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