Influence of Mn and Ni on Austenite Stabilization during a High Temperature Q&P Treatment

2021 ◽  
Vol 1016 ◽  
pp. 379-384
Author(s):  
Eider Del Molino ◽  
Teresa Gutierrez ◽  
Mónica Serna-Ruiz ◽  
Maribel Arribas ◽  
Artem Arlazarov
Keyword(s):  
Phase Transformation ◽  
Electron Microscope ◽  
High Temperature ◽  
Retained Austenite ◽  
Nickel Content ◽  
X Ray Diffraction ◽  
Quenching And Partitioning ◽  
X Ray ◽  
Scanning Electron ◽  
P Cycle

The aim of this work was to study the influence of quenching and partitioning temperatures combined with various levels of Mn and Ni contents on the austenite stabilization along the quenching and partitioning (Q&P) cycle. Three steels with 2 wt.%, 4 wt.% and 6 wt.% manganese and one steel with 2 wt.% nickel content were investigated. Phase transformation temperatures and critical cooling rates were obtained experimentally using dilatometer for each alloy. Q&P cycles with different quenching and partitioning temperatures were also done in dilatometer, thus, allowing monitoring of the expansion/contraction during the whole Q&P cycle. Microstructure characterization was performed by means of a Scanning Electron Microscope and X-Ray Diffraction to measure retained austenite content. It was found that, strongly depending on the Q&P conditions, austenite stabilization or decomposition occurs during partitioning and final cooling. In case of high partitioning temperature cycles, austenite reverse transformation was observed. Certain cycles resulted in a very effective austenite stabilization and interesting microstructure.

INVESTIGATION ON HIGH-TEMPERATURE CORROSION BEHAVIOR OF INCONEL 600 UNDER SO2-BEARING GAS AT 650°C

2019 ◽  
Vol 27 (06) ◽  
pp. 1950155
Author(s):  
KWANG-HU JUNG ◽  
SEONG-JONG KIM
Keyword(s):  
Electron Microscope ◽  
Weight Gain ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
High Temperature Corrosion ◽  
X Ray Diffraction ◽  
Oxide Structure ◽  
X Ray ◽  
Inconel 600 ◽  
Scanning Electron

The corrosion characteristics of Inconel 600 were investigated at 650∘C in air and 76%[Formula: see text]%[Formula: see text]%[Formula: see text]%SO2 gas environment up to 500[Formula: see text]h. Specimens exposed to each condition were characterized by weight gain, scanning electron microscope, energy dispersive X-ray spectroscopy and X-ray diffraction. The oxide structure consisting of the thin Cr2O3 layer and Cr2O3 nodules was observed, which increased the weight gain of specimens. In the SO2-bearing gas, it showed a bigger weight gain due to the coarsening of Cr2O3 nodules. Therefore, it was suggested that the sulfur-accelerated coarsening of Cr2O3 nodules at the high temperature.

Self-Propagating High-Temperature Synthesis of Fe-W(B, C) Based Composite

2013 ◽  
Vol 748 ◽  
pp. 46-50 ◽  
Author(s):  
Saowanee Singsarothai ◽  
Sutham Niyomwas
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
The Self ◽  
X Ray Diffraction ◽  
Temperature Synthesis ◽  
X Ray ◽  
High Temperature Synthesis ◽  
Flame Ignition ◽  
Scanning Electron

Fe-W based composite have successfully been prepared using natural resource. The ferberite (Fe (Mn, Sn)WO4) tailings mixed with aluminum, carbon and boron oxide powder were used as reactants. The reactants were pressed and followed by oxy-acetylene flame ignition. The products from the self-propagating high-temperature synthesis (SHS) reaction were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) couple with dispersive X-ray (EDS).

The Influence of the Hydrothermal Conditions on the Morphologies of β-Ni(OH)2

2012 ◽  
Vol 562-564 ◽  
pp. 494-497
Author(s):  
Xiao Ming Fu
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Reaction Time ◽  
Scanning Electron Microscope ◽  
Reaction Temperature ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Low Reaction Temperature ◽  
Scanning Electron

Flower-like β-Ni(OH)2 and nanoflakes have been successfully synthesized with nickel nitrate as nickel source and stronger ammonia water as precipitant via the hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD shows that the phase of the samples is β-Ni(OH)2. SEM confirms that The low reaction temperature is propitious to the synthesis of flower-like β-Ni(OH)2, and with the increase of the reaction time the nanoflakes of flower-like β-Ni(OH)2 become much thinner. However, The high temperature is in favor of the synthesis of β-Ni(OH)2 nanosflakes, and with the further increase of the reaction temperature.

Influence of SiC on the Properties of PcBN Cutting Tools Fabricated by High Pressure and High Temperature Sintering

2016 ◽  
Vol 697 ◽  
pp. 526-529 ◽  
Author(s):  
Shi Xun Zhang ◽  
Jian Li ◽  
Yao Ma ◽  
Hai Long Wang ◽  
Rui Zhang
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
Cutting Tools ◽  
X Ray Diffraction ◽  
Micro Structure ◽  
X Ray ◽  
Scanning Electron

SiC-Al3BC3-cBN composites with different contents of cBN were fabricated by high pressure and high temperature sintering (HPHT) at 1450 °C for 3 min under a pressure of 5.0 GPa using SiC, Al, B4C and C as additives. The effect of SiC content on the density and mechanical properties of SiC-Al3BC3-cBN composites was investigated. X-ray diffraction (XRD) and Scanning electron microscope (SEM) were used to analyze phases and micro-structure of the sintered samples. The hardness of SiC-Al3BC3-cBN composites decreased with the increasing of SiC content, However, the fracture strength of SiC-Al3BC3-cBN composites increased with the increasing of SiC content.

Research on Preparation and Properties of Magnetic Abrasive by Conventional Solid-State Method

2009 ◽  
Vol 416 ◽  
pp. 553-557 ◽  
Author(s):  
Zeng Dian Zhao ◽  
Yu Hong Huang ◽  
Yu Gang Zhao ◽  
Xian Jin Yu
Keyword(s):  
Electron Microscope ◽  
High Temperature ◽  
Energy Dispersive Spectrometer ◽  
Ferromagnetic Phase ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
X Ray ◽  
Conventional Solid State Method ◽  
State Method ◽  
Scanning Electron

The silicon-coated iron powder was evenly mixed with corundum powder and high temperature binder. After tabletting and sintering, followed by crushing and screening, the magnetic abrasive with a certain size was obtained. Scanning electron microscope (SEM), Energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were respectively used to characterize the morphology, elemental composition and the crystalloid structures of magnetic abrasive. The ferromagnetic phase and abrasive phase were combined firmly. The magnetic abrasive prepared showed a good grinding ability, whose durable time was up to 24 min. Irregular particles was obtained by smashing the magnetic abrasive, mainly composed of Al2O3, Fe2O3, α-Fe, AlFeO3, (Al, Fe)7BO3(SiO4)3O3.

Corrosion Behavior of Fe-12Cr-2Mo Stainless Steel in Na2SO4-50%NaCl with Flowing Ar-20%O2 Environments at High Temperature

2015 ◽  
Vol 1107 ◽  
pp. 727-732
Author(s):  
Muhamad Izhar Sahri ◽  
Norinsan Kamil Othman ◽  
Abdul Razak Daud ◽  
Azman Jalar
Keyword(s):  
Stainless Steel ◽  
Electron Microscope ◽  
High Temperature ◽  
Chromium Concentration ◽  
Oxide Scales ◽  
X Ray Diffraction ◽  
Salt Mixture ◽  
Cross Sectional ◽  
X Ray ◽  
Scanning Electron

The behavior of Fe-12Cr-2Mo stainless steel exposed isothermally in tube furnace at 700°C for 10 h had been studied in different environments; of mixed environment (Ar-20%O2 with coated Na2SO4-50%NaCl salts), molten salt (Na2SO4-50%NaCl) and dry oxygen (Ar-20%O2) atmospheres. The exposed samples were characterized by using optical microscopy (OM), scanning electron microscope (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD). The results indicated that, sample exposed in mixed environments undergoes highest corrosion rate compared with other samples. The main phase exists in all samples generally were iron-rich oxides which non-protective and thick. Conversely, EDX analysis on cross-sectional samples revealed the Cr-enrichment developed underneath the iron-rich oxide scales as the chromium concentration increases towards near the substrate. In presence of salt mixture, the oxide scales undergo spallation, however there is no crack observed. The catastrophic corrosion sample was occurred in combined environment due to the oxidation induced by the chloridation and sulfidation phenomena as well.

INSULATING 211 PHASE-SUPERCONDUCTING 123 PHASE TRANSFORMATION IN THE YBaCuO SYSTEM

1991 ◽  
Vol 05 (17) ◽  
pp. 1139-1145
Author(s):  
C. Y. HUANG ◽  
B. H. LOO ◽  
M. K. WU
Keyword(s):  
Phase Transformation ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Raman Scattering ◽  
Electrical Resistance ◽  
Magnetic Data ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical Resistance Measurements ◽  
Scanning Electron

We have studied the conversion of insulating Y 2 BaCuO 5 to superconducting YBa 2 Cu 3 O x by means of Raman scattering, magnetization and electrical resistance measurements, scanning electron microscope and X-ray diffraction methods. The magnetic data show that as high as 12% of the conversion can be achieved.

Investigate of Phase Compositions and Microstructure of MgO-C through In Situ Nitride

2014 ◽  
Vol 881-883 ◽  
pp. 914-917
Author(s):  
Xiao Jun Zhang ◽  
Nai Peng ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu ◽  
Wen Jie Yuan
Keyword(s):  
Phase Transformation ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Scanning Electron

In this paper, the phase compositions and microstructure of MgO-C samples containing Si powder in N2sintered at 1350-1500°C were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The α-Si3N4, β-Si3N4, MgSiN2and SiC phases have formed together with MgO and C phases in the sintered samples. The morphologies of β-Si3N4crystals were almost in the shape of rod-like through the α-β phase transformation of Si3N4by Mg-Si-O-N and silicon liquid. The morphologies of α-Si3N4crystals were in the shape of equiaxed. The morphology of MgSiN2crystals was in the shape of polyhedron with the size of 5 μm.

The Research of AlN-Mo Nano Composite Ceram

2013 ◽  
Vol 853 ◽  
pp. 57-61
Author(s):  
Chun Yu Xin
Keyword(s):  
High Pressure ◽  
Electron Microscope ◽  
High Temperature ◽  
Scanning Electron Microscope ◽  
X Ray Diffraction ◽  
Powder Synthesis ◽  
Nano Composite ◽  
X Ray ◽  
Structure Morphology ◽  
Scanning Electron

In this paper six sides top technology of high temperature and high pressure, in AlN nanopowder mixed with Mo powder, synthesis of AlN - Mo. Nanocomposite ceramics Using X-ray diffraction (XRD), scanning electron microscope (SEM) and vickers hardness instrument of AlN - Mo in the nanocomposite ceramics phase structure, morphology, size and hardness of the characterization, compared with AlN nanoceramic, discusses the AlN - Mo of nanocomposite ceramics new features.

Synthesis of Al4SiC4 Powders from Kaolin Grog, Aluminum and Activated Carbon as Raw Materials

2011 ◽  
Vol 399-401 ◽  
pp. 788-791 ◽  
Author(s):  
Wen Jie Yuan ◽  
Jun Li ◽  
Chao Pan ◽  
Cheng Ji Deng ◽  
Hong Xi Zhu
Keyword(s):  
Activated Carbon ◽  
Electron Microscope ◽  
High Temperature ◽  
Raw Materials ◽  
Synthesis Temperature ◽  
Phase Changes ◽  
Temperature Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

In Al-Si-C system, there are many compounds, of which Al4SiC4 is useful as high-temperature structure material and the antioxidant in carbon-containing refractory. In this paper, Al4SiC4 powders were synthesized by using kaolin grog, aluminum and activated carbon as raw materials. The phase changes of the synthesized samples were examined by X-ray diffraction (XRD), and the microstructure was observed by scanning electron microscope (SEM). The effects of synthesis temperature and the proportion of aluminum on phase compositions of Al-Si-C system were investigated. The results show plate-like Al4SiC4 powders can be prepared with optimal ratio of starting materials and synthesis temperature.

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