Dual-wall zirconia induction furnace for the production of high-strength silica fibers

1986 ◽  
Author(s):  
U. C. PAEK ◽  
C. M. SCHROEDER
Keyword(s):  
Induction Furnace ◽  
High Strength ◽  
Silica Fibers

Effects of Si Addition on Microstructure, Properties and Serration Behaviors of Lightweight Al-Mg-Zn-Cu Medium-entropy Alloys

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Yasong Li ◽  
Ruixuan Li ◽  
Yong Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Induction Furnace ◽  
Low Cost ◽  
High Strength ◽  
Vacuum Induction Furnace ◽  
Precipitated Phase ◽  
Si Content ◽  
Serration Behavior ◽  
Si Addition

A series of as-cast lightweight multicomponent alloys Al(86-x)Mg10Zn2 Cu2 Six (x=0, 0.3, 0.6, 0.9, 1.2 at.%) were prepared by a vacuum induction furnace with a steel die. With the addition of Si, the reticular white Al-Cu phase deposited were gradually replaced by the gray eutectic Mg-Si phase, while the compressive strength of the alloys increases first and then decreases slowly. It is particularly noteworthy that the compression plasticity also exhibits this trend. When the Si content is 0.9 at.%, the compressive strength reaches its maximum at 779.11 MPa and the compressive plasticity reaches 20.91%. The effect of the addition of Si on the serration behavior of alloy was also studied; we found that the addition of Si introduces a new MgSi phase, and with the change of Si is significantly affects the morphology of the precipitated phase, which affects the serration behavior of the alloys. The comprehensive mechanical properties of the alloy are optimal at the critical point where the serration behavior disappears.In this work, we have provided a method and a composition for the preparation of a low-cost, high-strength, lightweight medium-entropy alloys.

scholarly journals Effects of Si Addition on Microstructure, Properties and Serration Behaviors of Lightweight Al-Mg-Zn-Cu Medium-entropy Alloys

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Yasong Li ◽  
Ruixuan Li ◽  
Yong Zhang
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Induction Furnace ◽  
Low Cost ◽  
High Strength ◽  
Vacuum Induction Furnace ◽  
Precipitated Phase ◽  
Si Content ◽  
Serration Behavior ◽  
Si Addition

A series of as-cast lightweight multicomponent alloys Al(86-x)Mg10Zn2Cu2Six (x=0, 0.3, 0.6, 0.9, 1.2 at.%) were prepared by a vacuum induction furnace with a steel die. With the addition of Si, the reticular white Al-Cu phase deposited were gradually replaced by the gray eutectic Mg-Si phase, while the compressive strength of the alloys increases first and then decreases slowly. It is particularly noteworthy that the compression plasticity also exhibits this trend. When the Si content is 0.9 at.%, the compressive strength reaches its maximum at 779.11 MPa and the compressive plasticity reaches 20.91%. The effect of the addition of Si on the serration behavior of alloy was also studied; we found that the addition of Si introduces a new MgSi phase, and with the change of Si is significantly affects the morphology of the precipitated phase, which affects the serration behavior of the alloys. The comprehensive mechanical properties of the alloy are optimal at the critical point where the serration behavior disappears. In this work, we have provided a method and a composition for the preparation of a low-cost, high-strength, lightweight medium-entropy alloys.

In Situ Synthesis of Cr2Nb Reinforced Copper Alloy by Liquid Metallurgy Route

2012 ◽  
Vol 710 ◽  
pp. 143-148 ◽  
Author(s):  
Narendra B. Dhokey ◽  
Sriganesh N. Sarve ◽  
Harshanand A. Lamsoge
Keyword(s):  
Copper Alloy ◽  
Induction Furnace ◽  
High Strength ◽  
Precipitate Size ◽  
Space Application ◽  
Reusable Launch Vehicle ◽  
Average Hardness ◽  
Cast Product ◽  
Copper Melt

Cu-8Cr-4Nb alloy with high strength and high thermal conductivity have received a lot of attention over the last decades due to promising role in space application of rocket combustion chamber of reusable launch vehicle. In the present work, the copper alloy is synthesized in induction furnace by liquid metallurgy route wherein elemental powders of chromium and niobium was used added into premelted copper melt under argon atmosphere. The cast product is characterised for hardness, optical, SEM, EDS and XRD. It is possible to produce this alloy with reproducible average hardness of 135 VHN. The precipitate of Cr2Nb showed moderate distribution in and around the grain boundaries of copper with precipitate size varying from 1.33 μm to7.0 μm.

Effect of V(C,N) Master Alloy on the Grain Size of Low Carbon High Strength Bainite Steel

2015 ◽  
Vol 815 ◽  
pp. 292-296 ◽  
Author(s):  
Quan Lyu ◽  
Hao Yu Wen ◽  
Zheng Hua Tang ◽  
Qi Hu ◽  
Bo Cheng
Keyword(s):  
Grain Size ◽  
Master Alloy ◽  
Induction Furnace ◽  
High Strength ◽  
Lower Bainite ◽  
Optical Microscope ◽  
N Addition ◽  
Low Carbon ◽  
Bainite Steel ◽  
Ti Addition

The V(C,N) nanometer powder master alloy was added into a low carbon high strength bainite steel to refine grain size, and its refinement action with that of Ti addition was compared. The experimental specimens were melted in 25kg induction furnace with 0.03%Ti, 0.15%, 0.24%, 0.31% and 0.50% V(C,N) addition, respectively. The specimens were observed by optical microscope, XRD and EDS. The results showed that 0.03%Ti addition refined to the grain size to 13μm-18μm in the research steel, but to 6.5μm-10μm in the case of 0.31% V(C,N) master alloy. And the 0.31% V(C,N) addition has better refining effect than 0.15, 0.24% and 0.50%V(C,N) addition. The microstructure of research steels was lower bainite and martensite for all specimens.

scholarly journals Investigation into the dephosphorization of ferromanganese alloys for the production of advanced high-strength steel

2021 ◽  
Vol 121 (9) ◽  
pp. 1-9
Author(s):  
M.P. Maphutha ◽  
J.D. Steenkamp ◽  
P.C. Pistorius
Keyword(s):  
Partition Coefficient ◽  
Steel Industry ◽  
High Strength Steel ◽  
Induction Furnace ◽  
High Strength Steels ◽  
High Strength ◽  
Laboratory Scale ◽  
Motor Vehicles ◽  
Advanced High Strength Steel ◽  
Advanced High Strength Steels

Advanced high-strength steels (AHSS) are sophisticated materials being developed by the steel industry to mitigate challenges related to the performance of motor vehicles. To meet the requirements of AHSS, the ferromanganese alloys (FeMn) utilized in the production of the steel are required to contain acceptable levels of unwanted impurities, i.e. P, S, N, H, and C. The focus of the current study was to investigate dephosphorization of ferromanganese to produce a low-P alloy that could be effectively utilized in the production of AHSS. The study involved conducting laboratory-scale testwork to study the efficiency of CaO-based slag systems to dephosphorize FeMn alloys. The addition of Na2O, CaF2, and BaO to MnO-CaO-SiO2 slag was considered. The test work was carried out in a 25 kW induction furnace at temperatures of 1350°C, 1400°C, and 1450°C. The P partition coefficient (Lp) remained small at <1, which is an indication that dephosphorization had not been achieved. The baseline slag, comprising 40%CaO-40%SiO2-20%MnO, reported higher Lpvalues. Addition of Na2O and CaF2 did not show any further benefit. Substituting half of the CaO by BaO, resulted in similar Lpvalues to those of the baseline slag under conditions of 1350°C and 1450°C at 30 minutes. In summary, based on the Lpvalues obtained, the conditions investigated with the CaO-based slags appeared to have been unfavourable for dephosphorization of FeMn alloys, as most of this impurity element remained in the alloy.

High Strength, All-Silica Fibers For Adverse Environments

1989 ◽  
Author(s):  
James P. Clarkin ◽  
Bolesh J. Skutnik
Keyword(s):  
High Strength ◽  
Silica Fibers ◽  
Adverse Environments

High Strength, Large Core Pure Silica Fibers For Laser Surgery

1988 ◽  
Author(s):  
B. J. Skutnik ◽  
M. H. Hodge ◽  
J. P. Clarkin
Keyword(s):  
Laser Surgery ◽  
High Strength ◽  
Large Core ◽  
Pure Silica ◽  
Silica Fibers

scholarly journals Solution-Phase Synthesis of Silica Fibers and Their Use in Making Transparent High-Strength Silica-Polymer Composites

2018 ◽  
Vol 3 (47) ◽  
pp. 13427-13431 ◽  
Author(s):  
Daron Spence ◽  
Jaehyung Park ◽  
David A. Cullen ◽  
Hoi Chun Ho ◽  
Georgios Polizos ◽  
...  
Keyword(s):  
Polymer Composites ◽  
High Strength ◽  
Solution Phase ◽  
Phase Synthesis ◽  
Silica Fibers ◽  
Solution Phase Synthesis
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