Microstructure and Mechanical Properties of 9Cr-ODS Ferritic/Martensitic Steels by Mechanically Alloyed and Spark Plasma Sintering

2013 ◽  
Vol 747-748 ◽  
pp. 636-640 ◽  
Author(s):  
Jian Yang ◽  
Zhi Meng Guo ◽  
Wei Wei Yang ◽  
Ji Luo ◽  
Cun Guang Chen
Keyword(s):  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Yield Strength ◽  
Spark Plasma Sintering ◽  
Water Solution ◽  
Oxide Dispersion Strengthened ◽  
Martensitic Steels ◽  
Ods Steel ◽  
Plasma Sintering ◽  
Spark Plasma

9Cr-0.35wt.%Y2O3 oxide dispersion strengthened (ODS) ferritic/martensitic steels were prepared by mechanically alloying (MA) and spark plasma sintering (SPS). FE-SEM and TEM with X-ray energy spectrum (EDX) were employed to characterize the microstructural evolution and chemical composition before and after heat treatment. The tensile properties at room temperature were also investigated by electronic tensile test. The result shows that it is mainly of equiaxed ferrite microstructure by SPS with mean grain size of about 500nm. Dispersoids about 5-20nm which are enriched in Y, Ti and O uniformly distribute in the matrix. It exhibits a high relative density, ultimate tensile strength and yield strength of 99.5%, 1554MPa and 1430MPa, respectively. The microstructures are of slender lath martensitic after 10%NaCl water solution quenching, while after tempering at 750 which change into mainly equiaxed ferritic and a little residual ferrite. The ODS steel exhibits ultimate tensile strength, yield strength and total elongation of 1198MPa, 1006MPa and 12.8% after tempering, respectively.

Microstructures and Mechanical Properties of Consolidated Mg-Zn-Y Alloy

2007 ◽  
Vol 534-536 ◽  
pp. 833-836 ◽  
Author(s):  
J.K. Lee ◽  
Taek Soo Kim ◽  
Ha Guk Jeong ◽  
Jung Chan Bae
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Solid Solution Matrix ◽  
Solution Matrix ◽  
Consolidation Temperature

The microstructure and mechanical properties of the Mg97Zn1Y2 alloy prepared by spark plasma sintering of gas atomized powders have been investigated. After consolidation, precipitates were observed to form in the α-Mg solid solution matrix of the Mg97Zn1Y2 alloy. These precipitates consisted of Mg12YZn and Mg24Y5 phases. The density of the consolidated bulk Mg-Zn-Y alloy was 1.86 g/cm3. The ultimate tensile strength and elongation were dependent on the consolidation temperature, which were in the ranges of 280 to 293 MPa and 8.5 to 20.8 %, respectively.

Spark Plasma Sintering of Mechanically Activated Ni and Al Nanopowders

2014 ◽  
Vol 682 ◽  
pp. 188-191 ◽  
Author(s):  
Lilia I. Shevtsova ◽  
T.S. Sameyshcheva ◽  
D.D. Munkueva
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Relative Density ◽  
Spark Plasma Sintering ◽  
Three Point Bending ◽  
Mechanical Properties Of Materials ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Properties Of Materials

The structure and mechanical properties of materials fabricated by spark plasma sintering of mechanically activated mixture of nickel and aluminum nanopowders were investigated. On account of the elemental powders ratio formation of Ni3Al compound was expected. Relative density of sintered samples was equal to ~ 95 %, microhardness of materials was 6540 MPa. Ultimate tensile strength of samples tested according to three-point bending scheme exceed 1100 MPa.

scholarly journals Characterization of 14Cr ODS Steel Fabricated by Spark Plasma Sintering

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 200 ◽  
Author(s):  
Qian Zhao ◽  
Zhixia Qiao ◽  
Yongchang Liu ◽  
Liming Yu ◽  
Yuan Huang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Oxide Dispersion Strengthened ◽  
Ods Steel ◽  
Plasma Sintering ◽  
Composite Oxides ◽  
The Matrix ◽  
Spark Plasma ◽  
Mixed Fracture ◽  
Average Size

: Oxide Dispersion Strengthened (ODS) steel with a composition of Fe-14Cr-2W-0.2V-0.07Ta-1Al-0.3Y2O3 was fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). All of the investigations were performed on the as-SPSed ODS sample without further heat treatment. The microstructure, particles, and tensile properties of the ODS sample were analyzed. According to the results, both submicron-sized and micron-sized grains existed in the microstructure, showing a bimodal structure. The nanoparticles were homogeneously distributed in the matrix, and the nanoparticles in the ODS sample were mainly Y-Al-O composite oxides. Two kinds of Y-Al-O nanoparticles were identified: Y3Al5O12 particles with body-centered cubic structures and Y4Al2O9 particles with monoclinic structures. The size of the nanoparticles ranged from 2 nm to 61.5 nm, and the average size of the nanoparticles was 11 ± 2.7 nm. Except for the nanoparticles, large M23C6 particles that were detrimental to the ductility of the ODS sample were also identified. These large M23C6 particles possessed a long strip or rod-like morphology, and were generally distributed along the grain boundaries. The generation of cracks generally occurred in the region where the large M23C6 particles were located during the tensile test. The as-SPSed ODS steel possessed a ductile/brittle mixed fracture mode according to the fracture surfaces analysis.

scholarly journals Joining of Oxide Dispersion-Strengthened Steel Using Spark Plasma Sintering

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1040
Author(s):  
Foad Naimi ◽  
Jean-Claude Niepce ◽  
Mostapha Ariane ◽  
Cyril Cayron ◽  
José Calapez ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Oxide Dispersion Strengthened ◽  
Tensile Tests ◽  
Control Surface ◽  
Oxide Dispersion ◽  
Simultaneous Application ◽  
Ods Steel ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Welding Processes

Difficulties with joining oxide dispersion-strengthened (ODS) steels using classical welding processes have led to the development of alternative joining techniques such as spark plasma sintering (SPS). SPS, which is classically employed for performing sintering, may also be used to join relatively large components due to the simultaneous application of electrical pulsed current and uniaxial charge. SPS technology was tested by joining two ODS steel disks. The preliminary tests showed that it is necessary to control surface roughness before joining. Furthermore, the use of ground and lapped surfaces seemed to improve the quality of the interface. Tensile tests on two ODS cylinders joined using SPS were performed at 750 °C without any additives. Failure occurred away from the interface with a total elongation close to 50% and an ultimate stress of 110 MPa.

Microstructure and Mechanical Properties of Magnesium Prepared by Spark Plasma Sintering

2010 ◽  
Vol 129-131 ◽  
pp. 764-768 ◽  
Author(s):  
Wan Nur Azrina Wan Muhammad ◽  
Yoshiharu Mutoh ◽  
Yukio Miyashita
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Spark Plasma Sintering ◽  
Sintering Temperature ◽  
Pressureless Sintering ◽  
Microstructure And Mechanical Properties ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Method

Magnesium powders were sintered by using spark plasma sintering (SPS) and conventional pressureless sintering (PLS) techniques at sintering temperatures ranged from 552°C to 605°C to investigate effect of sintering method on microstructure and mechanical properties of sintered magnesium. High densed magnesium could be obtained by using spark plasma sintering technique compared to conventional presureless sintering at the same sintering temperature. It was found that the ultimate tensile strength increased with increasing sintering temperature for both the materials sintered by PLS and SPS. The magnesium samples prepared by SPS showed better mechanical properties than those prepared by PLS. The microstructural observations revealed that the grain growth was not significant in SPS process compared to PLS, which would enhance the mechanical properties of the SPS sintered magnesium.

scholarly journals Effect of Nano-Y2O3 Addition on Microstructure and Tensile Properties of High-Nb TiAl Alloy Prepared by Spark Plasma Sintering

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1048
Author(s):  
Yingchao Guo ◽  
Yongfeng Liang ◽  
Junpin Lin ◽  
Fei Yang
Keyword(s):  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Tial Alloy ◽  
Second Phase ◽  
Fine Grain ◽  
Fine Grain Strengthening ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Y2o3 Addition ◽  
Powder Metallurgy Route

Nano-Y2O3 reinforced Ti-47.7Al-7.1Nb-(V, Cr) alloy was fabricated by a powder metallurgy route using spark plasma sintering (SPS), and the influence of nano-Y2O3 contents on the microstructure and mechanical properties were investigated systematically. The results revealed that the ultimate tensile strength and elongation of the alloy were 570 ± 28 MPa and 1.7 ± 0.6% at 800 °C, 460 ± 23 MPa and 6.1 ± 0.4% at 900 °C with no nano-Y2O3, 662 ± 24 MPa and 5.5 ± 0.5% at 800 °C, and 466 ± 25 MPa and 16.5 ± 0.8% at 900 °C with 0.05 at% nano-Y2O3 addition, respectively. Due to the fine-grain strengthening and the second-phase strengthening, both tensile strength and elongation of the high-Nb TiAl alloy were enhanced with the addition of nano-Y2O3.

scholarly journals Peculiarities of helium porosity evolution in the ferritic–martensitic steels produced by spark plasma sintering

2018 ◽  
Vol 16 ◽  
pp. 249-257
Author(s):  
I.I. Chernov ◽  
М.S. Staltsov ◽  
B.A. Kalin ◽  
I.A. Bogachev ◽  
S.N. Korshunov
Keyword(s):  
Spark Plasma Sintering ◽  
Martensitic Steels ◽  
Porosity Evolution ◽  
Plasma Sintering ◽  
Spark Plasma

Joining of oxide dispersion strengthened Eurofer steel via spark plasma sintering

2019 ◽  
Vol 256 ◽  
pp. 126670 ◽  
Author(s):  
J. Fu ◽  
J.C. Brouwer ◽  
I.M. Richardson ◽  
M.J.M. Hermans
Keyword(s):  
Spark Plasma Sintering ◽  
Oxide Dispersion Strengthened ◽  
Oxide Dispersion ◽  
Plasma Sintering ◽  
Spark Plasma

Properties of Ni-Cu Bulk Alloy Prepared by Spark Plasma Sintering Technique

2012 ◽  
Vol 476-478 ◽  
pp. 949-953
Author(s):  
Li Xin Li
Keyword(s):  
Tensile Strength ◽  
Spark Plasma Sintering ◽  
Tensile Tests ◽  
Arc Plasma ◽  
Bulk Alloy ◽  
Evaporation Method ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Bulk Alloys

Ni-Cu bulk alloys were successfully prepared with spark plasma sintering (SPS) technique from nanopowders obtained by the arc plasma evaporation method. The tensile tests indicated that the tensile strength of Ni-Cu bulk alloy sintered by SPS at 600°C was the highest among the Ni-Cu bulk alloys sintered at different temperature and much higher than that of bulk ingots. Through investigating the fractographs of the bulk alloy, the intrinsic reasons for the tensile strength of the sintered specimens were discussed.

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