Study on Carbide in Forged and Annealed H13 Hot Work Die Steel

2015 ◽  
Vol 34 (6) ◽  
Author(s):  
Ji Li ◽  
Jing Li ◽  
Liangliang Wang ◽  
Longfei Li
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Hot Forging ◽  
Quantitative Chemical Analysis ◽  
Analysis Method ◽  
X Ray Diffraction ◽  
H13 Steel ◽  
Die Steel ◽  
Thermo Calc Software ◽  
Hot Work Die ◽  
Primary Carbides

AbstractThe present work studied the carbides in forged and annealed H13 hot work die steel. The carbides were examined by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) and analyzed with quantitative chemical analysis method. The carbide types, qualities and compositions in dependence on temperatures were thermodynamically calculated by Thermo-Calc software and compared with the experimental results. In the final, methods for carbide improvement were discussed. The results are as follows. The primary carbides and the carbide segregation are improved after the hot-forging operation. The carbides in the hot-forged and annealed H13 steel are M

scholarly journals Microstructural Stability and Softening Resistance of a Novel Hot-Work Die Steel

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 238 ◽  
Author(s):  
Ningyu Du ◽  
Hongwei Liu ◽  
Paixian Fu ◽  
Hanghang Liu ◽  
Chen Sun ◽  
...  
Keyword(s):  
Dislocation Slip ◽  
Microstructural Stability ◽  
H13 Steel ◽  
Die Steel ◽  
Die Steels ◽  
Molybdenum Carbides ◽  
Transmission Electron ◽  
Service Period ◽  
Tempering Treatment ◽  
Hot Work Die

A novel hot-work die steel, named 5Cr5Mo2, was designed to obtain superior thermal stability. The proposed alloy is evaluated in terms of its hardness, microstructure, and tempering kinetics. Compared with the commonly used H13 steel, the softening resistance of the designed steel is superior. Based on SEM and transmission electron microscopy (TEM) observations, a higher abundance of fine molybdenum carbides precipitate in 5Cr5Mo2 steel. Strikingly, the coarseness rate of the carbides is also relatively low during the tempering treatment. Moreover, owing to their pinning effect on dislocation slip, the dislocation density of the 5Cr5Mo2 steel decreases more slowly than that of the H13 steel. Furthermore, a mathematical softening model was successfully deduced and verified by analyzing the tempering kinetics. This model can be used to predict the hardness evolution of the die steels during the service period at high temperature.

Influence of FeCrAl Coating Arc Sprayed on Aluminum Corrosion Resistance of H13 Steel

2015 ◽  
Vol 817 ◽  
pp. 565-570
Author(s):  
Jian Hua Zhao ◽  
Li Wang ◽  
Zheng Heng Shang
Keyword(s):  
Corrosion Resistance ◽  
Cross Section ◽  
Layer Structure ◽  
Energy Dispersive Spectrometer ◽  
Electric Arc ◽  
Arc Spraying ◽  
X Ray Diffraction ◽  
H13 Steel ◽  
X Ray ◽  
Aluminum Corrosion

FeCrAl coating was prepared on the surface of H13 steel through electric arc spraying (EASP) technology. The surface and cross section morphology, elements and phase composition of the composite coating were analyzed by the means of scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The aluminum corrosion resistance was tested by the static hot-dip aluminum method in molten AC4C aluminum at 700°C. The result showed that the FeCrAl coating, of which the microstructure was compact, had typical layer structure, and a small amount of oxide films and pores could be found among the lamellar particles. FeCrAl coating mainly contained Fe-Cr solid solution and small amounts of Al2O3. The weight of H13 corrosion was 3 times as much as that of FeCrAl coating corrosion after static melting treatment for 1h, and the corrosion rate of H13 steel and FeCrAl coating were both increased as the corrosion time increased from 1h to 3h. It was worthy noted that the weight of H13 corrosion was significantly increased, which was 17 times as much as that of FeCrAl coating corrosion.

CARPENTER 883 PLUS

Alloy Digest ◽  
1994 ◽  
Vol 43 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Structural Integrity ◽  
Heat Treating ◽  
Die Steel ◽  
Aisi Type ◽  
Red Hardness ◽  
Hot Work Die

Abstract CARPENTER 883 PLUS is a 5% Chromium hot work die steel designed for applications requiring both toughness and good red-hardness. It achieves this with higher purity, homogeneity and greater structural integrity than standard AISI type H13. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and machining. Filing Code: TS-529. Producer or source: Carpenter. See also Alloy Digest TS-469, January 1987.

PYROTOUGH 78

Alloy Digest ◽  
1993 ◽  
Vol 42 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Good Combination ◽  
Die Steel ◽  
Hot Work Die ◽  
Microstructural Integrity ◽  
High Degree

Abstract PYROTOUGH 78 is a hot work die steel possessing a high degree of purity, homogeneity and microstructural integrity that produces a good combination of toughness and temper resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on heat treating and machining. Filing Code: TS-522. Producer or source: Carpenter.

VDC-RF

Alloy Digest ◽  
2016 ◽  
Vol 65 (7) ◽  
Keyword(s):  
Physical Properties ◽  
Heat Treating ◽  
Steel Company ◽  
Die Steel ◽  
Hot Work Die ◽  
Specialty Steel ◽  
Work Type

Abstract VDC-RF hot work die steel is an improved version of H13 by melting practice. See also VDC Hot Work (Type H13), Alloy Digest TS-45, April 1956. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on heat treating and machining. Filing Code: TS-735. Producer or source: Latrobe Specialty Steel Company.

ORVAR SUPERIOR

Alloy Digest ◽  
2007 ◽  
Vol 56 (8) ◽  
Keyword(s):  
Fine Structure ◽  
High Temperature ◽  
North America ◽  
Thermal Fatigue ◽  
High Purity ◽  
Heat Treating ◽  
Good Resistance ◽  
Die Steel ◽  
Temperature Performance ◽  
Hot Work Die

Abstract Orvar Superior is a premium Cr-Mo-V alloyed hot-work die steel with good resistance to thermal fatigue. The name “superior” is used to indicate that close control in special melting and refining has attained a high purity and very fine structure that produces isotropic properties. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-653. Producer or source: Böhler-Uddeholm North America.

scholarly journals Experimental and Physico-Chemical Comparison of ZnO Nanoparticles’ Activity for Photocatalytic Applications in Wastewater Treatment

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 678
Author(s):  
Stefano Alberti ◽  
Irene Basciu ◽  
Marco Vocciante ◽  
Maurizio Ferretti
Keyword(s):  
Wastewater Treatment ◽  
Zno Nanoparticles ◽  
Energy Dispersive Spectrometer ◽  
Chemical Properties ◽  
X Ray Diffraction ◽  
Commercial Sample ◽  
Synthetic Process ◽  
Physico Chemical ◽  
Photocatalytic Applications ◽  
Reflectance Measurements

In this contribution, the photoactivity upon activation by simulated sunlight of zinc oxide (ZnO) obtained from two different synthetic pathways (Acetate and Nitrate) is investigated for water purification. Different reagents and processes were exploited to obtain ZnO nanoparticles. Products have been characterized by means of X-Ray Diffraction, Scanning Electron Microscopy along with Energy Dispersive Spectrometer, Dynamic Light Scattering, and Diffuse Reflectance Measurements, to highlight the different outcomes ascribable to each synthesis. A comparison of characteristics and performances was also carried out with respect to commercial ZnO. Nanoparticles of this semiconductor can be obtained as aggregates with different degrees of purity, porosity, and shape, and their physical-chemical properties have been addressed to the specific use in wastewater treatment, testing their effectiveness on the photocatalytic degradation of methylene blue (MB) as a model pollutant. Excluding the commercial sample, experimental results evidenced a better photocatalytic behavior for the ZnO Nitrate sample annealed at 500 °C, which was found to be pure and stable in water, suggesting that ZnO could be effectively exploited as a heterogeneous photocatalyst for the degradation of emerging pollutants in water, provided that thermal treatment is included in the synthetic process.

scholarly journals Extraction of Boron from Ludwigite Ore: Mechanism of Soda-Ash Roasting of Lizardite and Szaibelyite

Minerals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 533 ◽  
Author(s):  
Xin Zhang ◽  
Guanghui Li ◽  
Jinxiang You ◽  
Jian Wang ◽  
Jun Luo ◽  
...  
Keyword(s):  
Sodium Carbonate ◽  
Energy Dispersive Spectrometer ◽  
Low Grade ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Selective Activation ◽  
X Ray ◽  
Shed Light ◽  
Soda Ash ◽  
Scanning Electron

Ludwigite ore is a typical low-grade boron ore accounting for 58.5% boron resource of China, which is mainly composed of magnetite, lizardite and szaibelyite. During soda-ash roasting of ludwigite ore, the presence of lizardite hinders the selective activation of boron. In this work, lizardite and szaibelyite were prepared and their soda-ash roasting behaviors were investigated using thermogravimetric-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), and scanning electron microscope and energy dispersive spectrometer (SEM-EDS) analyses, in order to shed light on the soda-ash activation of boron within ludwigite ore. Thermodynamics of Na2CO3-MgSiO3-Mg2SiO4-Mg2B2O5 via FactSage show that the formation of Na2MgSiO4 was preferential for the reaction between Na2CO3 and MgSiO3/Mg2SiO4. While, regarding the reaction between Na2CO3 and Mg2B2O5, the formation of NaBO2 was foremost. Raising temperature was beneficial for the soda-ash roasting of lizardite and szaibelyite. At a temperature lower than the melting of sodium carbonate (851 °C), the soda-ash roasting of szaibelyite was faster than that of lizardite. Moreover, the melting of sodium carbonate accelerated the reaction between lizardite with sodium carbonate.

Preparation and Characterization of Zn-Containing Hydroxyapatite/TiO2 Composite Coatings on Ti Alloys

2011 ◽  
Vol 685 ◽  
pp. 367-370 ◽  
Author(s):  
Min Qi ◽  
Da Yi Yang ◽  
Jing Ying Zhang ◽  
Hong Jun Ai
Keyword(s):  
Adhesion Strength ◽  
Composite Coatings ◽  
Energy Dispersive Spectrometer ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Zn Content ◽  
Micro Arc Oxidation ◽  
Gel Technique ◽  
Bacteria Resistance

In order to improve the osteoblast growth and bacteria resistance, Zn-containing hydroxyapatite (Zn-HA) and titanium oxide (TiO2) composite coatings were prepared to improve binding between coating and Ti substrate. TiO2 film was prepared on the surface of Ti by micro-arc oxidation (MAO) and Zn-HA coating was deposited on TiO2 using sol–gel technique. Phase structure, composition and microstructure of the surface coatings were analyzed by X-ray diffraction (XRD) and Energy Dispersive Spectrometer (EDS), respectively. The adhesion strength between the coatings with different Zn content was measured by tensile testing. The results showed that there was no significant influence of Zn content on adhesion strength between coating and Ti substrate.

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