236 U Multi-modal Fission Paths on a Five-dimensional Deformation Surface

2019 ◽  
Vol 71 (4) ◽  
pp. 417 ◽  
Author(s):  
Zhi-Ming Wang ◽  
Wen-Jie Zhu ◽  
Xin Zhu ◽  
Chun-Lai Zhong ◽  
Tie-Shuan Fan
Keyword(s):  
Deformation Surface

scholarly journals INCREASING THE EFFICIENCY OF SURFACE STRENGTHENING OF METAL PRODUCTS BY COMBINED THERMODEFORMATION PROCESSING

2020 ◽  
pp. 103-110
Author(s):  
Oleksandr Danyleiko ◽  
Vitaliy Dzhemelinskyi ◽  
Dmytro Lesyk ◽  
Artemii Bernatskyi
Keyword(s):  
Surface Layer ◽  
Laser Beam ◽  
Surface Hardening ◽  
Thermal Deformation ◽  
Experimental Studies ◽  
Numerical Control ◽  
Surface Plastic ◽  
Beam Diameter ◽  
Metal Products ◽  
Deformation Surface

The article discusses the prospects of using combined thermal deformation surface processing to improve the performance properties of metal products. There is a new method of thermal deformation surface hardening (shot peening (SP) followed by laser heat treatment (LHT)) for tools and crown housings operating under difficult conditions proposed. For carrying out experimental studies, flat samples of 30KhGSA steel and steel 45 were selected. Preliminary hardening and finishing with static or dynamic methods of surface plastic deformation were carried out on a modernized installation based on a DYNAMITE 2800 numerical control machine, and SP was implemented on industrial equipment. Laser surface hardening of the samples was carried out in single passes with a sample moving speed of 300...500 mm/min with a laser beam diameter of 7.3 mm and a laser power of 1 kW using the ROFIN-SINAR DY 044 technological unit. The optimal regimes of surface hardening are determined under the deformation action of a gas-dynamic flow with solid particles and thermal action by a laser beam to obtain maximum values ​​of hardening depth and hardness. In particular, with SP, the gas-feed stream feed pressure is 0.5 MPa, the processing time is 1 min, regardless of the type of material. The optimal laser beam power is 1 kW at a sample travel speed of 300 mm/min. There are the results of experimental studies of the change in the hardening depth as a function of time and pressure after SP, the speed of movement of the treated sample from carbon steel 45 and medium alloyed steel 30KhGSA after LHT and combined SP+LHT, and also the distribution of microhardness over the depth of the hardened layer presented. It is revealed that the combined SP+LHT of 30 KhGSA steel at optimal modes forms 1.5 times (1.3 mm) greater depth of the strengthened surface layer in comparison with LHT, while providing the surface layer hardness of ~5400 MPa.

Influence of Cutting Speed on Plastic Deformation in Machined Surface of FGH95 PM Superalloy

2011 ◽  
Vol 148-149 ◽  
pp. 163-168
Author(s):  
Jin Du ◽  
Zhan Qiang Liu
Keyword(s):  
Plastic Deformation ◽  
Cutting Speed ◽  
Machining Process ◽  
Surface Plastic ◽  
Machined Surface ◽  
Nickel Based Superalloy ◽  
Aerospace Applications ◽  
Plastic Shear Strain ◽  
Deformation Surface ◽  
Fgh95 Superalloy

FGH95 nickel-based superalloy is produced by powder metallurgy (PM) processing for aerospace applications. Due to lower thermal conductivity, work hardening tendency during machining, and intensive adhesion to the surface of the tooling under operation, machining of FGH95 alloy is a significant challenges. The FGH95 machining process will induce substantial amount of plastic deformation in the surface and subsurface of the workpiece. A theoretical model is developed to predict the plastic deformation in machined surface of FGH95 superalloy. Experimental results are also applied to analyze the influence of cutting speed on plastic deformation in machined surface of FGH95. It is found that cutting speed has significantly effect on the plastic deformation in the machined surface. The increasing the cutting speed creates severer plastic deformation. Surface plastic shear strain increases with the increases of cutting speed, while the depth of plastic deformation decreases contrary.

Molecular dynamics simulation of the coalescence and melting process of Au and Cu nano-clusters

2018 ◽  
Vol 32 (06) ◽  
pp. 1850061
Author(s):  
Gang Chen ◽  
Chuan Jie Wang ◽  
Peng Zhang
Keyword(s):  
Shear Deformation ◽  
Melting Process ◽  
Dynamics Simulation ◽  
Particle Rotation ◽  
Interface Diffusion ◽  
Surface And Interface ◽  
Simulation Procedure ◽  
Increasing Temperature ◽  
Deformation Surface ◽  
Cu Nanoclusters

Molecular dynamic (MD) method is used to study the coalescence and fusing process of Au and Cu nanoclusters. The results show that shear deformation, surface and interface diffusion play important role in different stages of all simulation procedure. In most cases, shear deformation produces the twin boundary or/and stacking fault in particles by particle rotation and slide. The angle between the {111} of Au and Cu particles decrease with increasing temperature, which promotes the formation of the stable interface. Furthermore, the coalescence point and melting temperature increase as cluster diameter increases. For the other cases, there are no particle rotation and slide phenomenon in the elevating temperature process because the stable interface can be formed by forming twin boundaries once two particles contact.

scholarly journals Study on Surface Roughness and Friction during Hot Rolling of Stainless Steel 301

2012 ◽  
Vol 500 ◽  
pp. 403-409
Author(s):  
Dong Bin Wei ◽  
Zheng Yi Jiang ◽  
Jun Xia Huang ◽  
Ai Wen Zhang ◽  
Xu Shi ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Oxide Scale ◽  
Hot Rolling ◽  
Steel Strip ◽  
Forming Process ◽  
Metal Forming Process ◽  
Gleeble 3500 ◽  
Short Time ◽  
Deformation Surface

A well-defined boundary condition is important for generating an accurate model for simulating metal forming process. It is important to characterize the features of the oxide scale in hot rolling of stainless steel strip. Short time oxidation tests in humid air with water vapor content of 7.0 vol. % were carried out using Gleeble 3500 thermo-mechanical simulator. The deformation, surface morphology of oxide scale, and the friction in hot rolling were studied by conducting hot rolling tests. The results show that the surface roughness decreases with an increase of reduction. The effect of oxide scale on friction and surface roughness transfer in hot rolling depends on oxide scale generated during reheating. When reheating time is increased, the average thickness of oxide scale increases and a relatively rough surface was obtained after hot rolling. Thick oxide scale of 301 steel shows the high lubricative effect.

scholarly journals Fault-dominated deformation in an ice dam during annual filling and drainage of a marginal lake

2005 ◽  
Vol 40 ◽  
pp. 174-178 ◽  
Author(s):  
Joseph S. Walder ◽  
Dennis C. Trabant ◽  
Michelle Cunico ◽  
Suzanne P. Anderson ◽  
Robert S. Anderson ◽  
...  
Keyword(s):  
Lake Level ◽  
Lake Basin ◽  
Uplift Rate ◽  
Steep Gradient ◽  
Surface Uplift ◽  
Entire Thickness ◽  
Dam Deformation ◽  
Normal Sense ◽  
Deformation Surface

AbstractIce-dammed Hidden Creek Lake, Alaska, USA, outbursts annually in about 2–3 days. As the lake fills, a wedge of water penetrates beneath the glacier, and the surface of this ‘ice dam’ rises; the surface then falls as the lake drains. Detailed optical surveying of the glacier near the lake allows characterization of ice-dam deformation. Surface uplift rate is close to the rate of lake-level rise within about 400 m of the lake, then decreases by 90% over about 100 m. Such a steep gradient in uplift rate cannot be explained in terms of ice-dam flexure. Moreover, survey targets spanning the zone of steep uplift gradient move relative to one another in a nearly reversible fashion as the lake fills and drains. Evidently, the zone of steep uplift gradient is a fault zone, with the faults penetrating the entire thickness of the ice dam. Fault motion is in a reverse sense as the lake fills, but in a normal sense as the lake drains. As the overall fault pattern is the same from year to year, even though ice is lost by calving, the faults must be regularly regenerated, probably by linkage of surface and bottom crevasses as ice is advected toward the lake basin.

The Mechanical Property and Microstructure of Ti-4Al-2V Alloy after High Speed Shot Peening Treatment

2007 ◽  
Vol 353-358 ◽  
pp. 730-734
Author(s):  
Xi Yan Zhang ◽  
Chong Jia ◽  
Xin Chun Zhao ◽  
Zhi Nong Liu ◽  
Jin Yi
Keyword(s):  
Wear Resistance ◽  
Wear Mechanism ◽  
High Speed ◽  
Wear Behavior ◽  
Influence Factors ◽  
Coarse Grain ◽  
Grain Surface ◽  
Deformation Surface ◽  
Microstructure Characteristic ◽  
Better Than

The microstructure characteristic and wear behavior of the severe deformation surface constitution of Ti-4Al-2V alloy were studied in this paper. The results show that the wear resistance of the deformed surface is much better than that of the coarse grain surface. And the wear mechanism of the nanocrystalline surface is different from that of the coarse grain surface. The former is particle wear mechanism of harder material and the latter is adherence wear mechanism. The influence factors on the wear resistance of the nanocrystalline surface have been discussed.

Research of Prediction Method in Large Slope for Three Dimensional Object Deformation

2011 ◽  
Vol 402 ◽  
pp. 337-342 ◽  
Author(s):  
Shi Guo Sun ◽  
Zhi Yi Bo ◽  
Jing Chen ◽  
Xiao Fang Li
Keyword(s):  
Rock Mass ◽  
Prediction Method ◽  
Theoretical Method ◽  
Mine Safety ◽  
Solid Deformation ◽  
Rock Mass Deformation ◽  
Slope Rock ◽  
3D Solid ◽  
Deformation Surface ◽  
Mass Deformation

Based on the mapping theoretical method, the deformation surface set model is established, which represents time series of slope 3D solid deformation. The phase in the series is deformation surface. Therefore, model set is dynamic deformation surface set of slope 3D solid deformation. Surface of deformation function reflects the distribution of slope rock mass deformation value in the special region, thus it can reveal the slope deformation law in different sections better. By engineering applied, the establishment of slope 3D deformed prediction model makes the behavior of slope rock mass deformation more direct, while makes it convenient for slope judgment of division and safety evaluation, so as to the decision basis for mine safety production and engineering control.

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