A5075734833- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Metal Alloys Wear and Properties
- High Temperature Alloys and Creep
- Microstructure and mechanical properties
- High-Temperature Coating Behaviors
- Advanced materials and composites
- Additive Manufacturing Materials and Processes
- Aluminum Alloys Composites Properties
- Intermetallics and Advanced Alloy Properties
- Aluminum Alloy Microstructure Properties
- Manufacturing Process and Optimization
- Metallic Glasses and Amorphous Alloys
- Solidification and crystal growth phenomena
- Laser and Thermal Forming Techniques
- Powder Metallurgy Techniques and Materials
- Additive Manufacturing and 3D Printing Technologies
- Nuclear Materials and Properties
- Advanced Materials Characterization Techniques
- High Entropy Alloys Studies
- Advanced Welding Techniques Analysis
- Welding Techniques and Residual Stresses
- Mechanical stress and fatigue analysis
- Fatigue and fracture mechanics
Harbin Engineering University
2019-2023
Ministry of Education
2019
The flow stress behavior of high-strength low-alloy (HSLA) steel at different true strains was studied using a hot compression test. effect dynamic recrystallization (DRX) on the transformed ferrite microstructures investigated with electron backscatter diffraction (EBSD). EBSD analysis indicated that fraction high-angle grain boundaries (HAGBs) and DRX increased increasing strain. low-angle (LAGBs) were gradually into HAGBs degree. When strain to 0.916, 85% 80.3%. relatively high related...
Abstract The surface of steel substrate was pretreated by nickel plating and Aluminum/nickel-plated bimetal prepared compound casting. After liquid aluminum casted on the nickel-plated steel, it placed in a heat preservation device temperature set at 760 °C. In casting process molten good metallurgical bonding is formed between means diffusion. Subsequently, microstructure aluminum/nickel-plated examined using Scanning Electron Microscopy (SEM) Energy Dispersive Spectroscopy (EDS)...
Abstract The flow behavior of Nb–V–Mo microalloyed steel at different deformation parameters was investigated using isothermal compression tests. microstructures the specimens after were observed through use a metallographic microscope. results indicated that temperature had significant effect on grain size deformed specimen and average grains increases with corresponding increase in range 800 °C–1100 °C. dislocations substructures characterized TEM. bulged boundary TEM when 1100 °C 1 s −1 ....
Abstract With the continuous development of ship technology, usage environment some parts has changed, with higher requirements for materials and preparation technology being put forward. Some traditional structural have do not meet actual working conditions ships, which necessitates new research on their technology. Owing to its high strength stable mechanical properties at temperature, molybdenum base alloy is expected replace nickel aluminum primary material in ships. Under conventional...
The hot deformation features of HSLA pipeline steel are researched in the temperature from 800 °C–1100 °C and strain rate 0.001–10 s−1 using isothermal compression tests. According to variation power dissipation efficiency with rate, working process map was obtained. exhibits three domains. first area exists 885 0.01–1 s−1. second domain occurs °C–860 0.012–1 third °C–825 0.001–0.008 When specimen deformed at higher lower is more than 0.3, which considered suitable for DRX occur may be a...
In this paper, the Titanium carbide/Molybdenum (TiC/Mo) alloy was prepared by spark plasma sintering (SPS). The oxidation process of TiC/Mo at different temperatures studied, and mechanism discussed in depth. focus is on influence introduction TiC particles high-temperature properties Mo alloys. phase composition morphology oxide film were analyzed means X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). results showed that, after oxidation,...
This work studied Mo-TiC-xCr (x = 0.0, 0.5, 1.0 wt.%) matrix composites with different component gradients prepared by Spark Plasma Sintering (SPS). The high-temperature oxidation test was conducted at 1200 ℃ in the atmosphere to study influence of Cr on behavior TiC-reinforced Mo composites. phase composition and morphology oxide film were analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), goal determine effect content...
Abstract In this paper, with reference to the composition and properties of widely used H13 hot working die steel, amount alloying elements in steel is reasonably improved, a new grade 4Cr4Mo2NiMnSiV designed. A process was designed wear were studied. SEM, EDS XRD utilized observe microstructure worn surface, products analyzed discuss mechanism. Conclusion illustrates coefficient friction cast gradually increases increasing temperature. Wear mainly caused by spalling high-temperature...
The research focuses on the high temperature oxidation resistance of martensitic heat-resistant steel. A new type steel was developed with addition Al and Cu, behavior at 650 °C 700 analyzed. kinetics curves were determined plotted by cyclic experiment discontinuous weighing method. XRD technique applied to qualitatively analyze surface oxide material after oxidation. cross-section morphology observed field emission scanning electron microscope (SEM) energy dispersive spectrometer (EDS),...
Abstract Research and design of different components molybdenum-cobalt alloy, including Mo-3Co Mo-6Co Mo-9Co alloy pure molybdenum alloy. The weight loss Mo-6 Co at 400 °C, 600 800 1000 °C after 1-hour oxidation was systematically analyzed. Observing the surface oxide layer, it found that vigorously oxidized to form volatile MoO3. As cobalt content increased, rate samples showed a downward trend temperatures. Granular oxides were formed when sample °C; scaly formed; blocky or flaky formed....
In this experiment, Ti-44Al-9Nb-1Cr-0.2W-0.2Y alloy was prepared by the directional solidification method. The effect of different growth rates on tensile properties and microstructure orientation at high temperature studied. Three kinds alloys with 10 μm/s, 15 μm/s 20 were prepared. results show that 800 ℃ decrease increasing rate, recrystallization occurred position intracrystal fracture in microstructure. size columnar crystals decreases increase number grains decreasing difference...
Abstract In this paper, the DD6 alloys after complete heat treatment were heat-treated at 900, 1000, 1100, 1200, 1300 °C for 1 h, then was air cooled. Microstructures treated by different temperatures investigationed OM and FESEM. The microstructures evolution of estimat using JMatPro software Image-Pro Plus. Conclusion illustrates size γ′ phase increases gradually alloy 1100 1200 reaches maximum °C. Most dissolves precipitate irregular small phase, about 0.20 nm preservation distribution...
The true stress-strain curve of HSLA steel was obtained though a MMS-200 experiment machine. flow behavior during isothermal compression at different deformation conditions investigated. result indicated the stress increases as strain rate or temperature decreases, and curves show obvious dynamic softening characteristics low high temperature. peak constitutive equation established activation energy be calculated 437955 J/mol. effective were studied by finite element method. simulation...
In this paper, fracture morphology observation, microstructure analysis, standard corrosion test, and other experimental methods are used to analyze the causes of cracking steam turbine blades (0Cr19Ni9) produced by a certain company. The results showed that cracks appeared during operation blade. A large number dimples were observed under scanning electron microscope, almost all which shear dimples; at same time, fatigue bands also distributed in them. internal cause is long-term service,...
A new type of hot working die steel was designed by using JMatPro, and high-temperature oxidation tests were carried out in the ambient atmosphere at 600 ℃ 700 ℃. The heat treatment process mechanism 4Cr4Mo2NiMnSiV studied detail. XRD, SEM EDS used to analyze crystallographic phases, surface cross-section morphologies oxide films. results show that main phases γ α + δ. During oxidation, Fe outer layer Cr inner occurred. After 600℃, comprised a monolayer with an uneven morphology. film had...