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Online since: June 2008
Authors: Krzysztof Jan Kurzydlowski, Halina Garbacz, Krzysztof Topolski
A reduction of the grain size of titanium leads to
a significant increase in its strength and hardness.
Parameters of hydrostatic extrusion processes applied to titanium Reduction of the rod diameter [mm] Temperature Accumulated strain (ε)ε)ε)ε) Total cross-section reduction (R) Number of HE stages Ø50mm → Ø3mm above recrystallization and ambient 5.63 277 11 Ø33mm → Ø5mm ambient 3.77 43.56 12 Ø20mm → Ø3mm ambient 3.79 44.44 12 Ø12mm → Ø3mm ambient 2.77 16 5 Description of hydro - extrusion method used here can be found in the earlier publications [10-12].
Comparison with the literature data [13-18] Summary The results obtained here allow to draw the following conclusions: 1.
Ø50→Ø3 Ø33→Ø5 Ø20→Ø3 Ø12→Ø3 Ti6Al4V Data from literature Current experimental study Acknowledgements: The study was realized in the framework of the 3T08A01929 project financed by the Polish Ministry of Science and Higher Education.
Parameters of hydrostatic extrusion processes applied to titanium Reduction of the rod diameter [mm] Temperature Accumulated strain (ε)ε)ε)ε) Total cross-section reduction (R) Number of HE stages Ø50mm → Ø3mm above recrystallization and ambient 5.63 277 11 Ø33mm → Ø5mm ambient 3.77 43.56 12 Ø20mm → Ø3mm ambient 3.79 44.44 12 Ø12mm → Ø3mm ambient 2.77 16 5 Description of hydro - extrusion method used here can be found in the earlier publications [10-12].
Comparison with the literature data [13-18] Summary The results obtained here allow to draw the following conclusions: 1.
Ø50→Ø3 Ø33→Ø5 Ø20→Ø3 Ø12→Ø3 Ti6Al4V Data from literature Current experimental study Acknowledgements: The study was realized in the framework of the 3T08A01929 project financed by the Polish Ministry of Science and Higher Education.
Online since: December 2011
Authors: Hirofumi Inoue
The hot-rolled plates were symmetrically cold rolled to 65-95% reductions in thickness and then asymmetrically warm rolled to 20-40% reductions by one pass at 473 K with a roll speed ratio of 1.5.
To reveal a change in texture during solution treatment, the area fraction of representative orientations were determined from EBSD data by using the samples annealed at 813 K for some short periods within 90 s and immediately water-quenched.
The near-{111}<110> recrystallization texture, which has a peak in the center of a {111} pole figure, is formed at relatively low reductions of AWR, while the {111} orientations hardly develop at all CR reductions under the condition of 40% AWR reduction and the main component is expressed by {013}<631>.
Here C90A25 means cold rolling to 90% reduction and asymmetric warm rolling to 25% reduction.
Fig. 10 Optical micrograph in longitudinal section for AZ31Mg sheet hot rolled to 30% reduction and asymmetrically hot rolled to 20% reduction. 50μm Fig. 11 (0001) pole density distribution for AZ31Mg sheets hot rolled to 30% reduction, asymmetrically hot rolled to 20% reduction and annealed at 573 K for 1800 s.
To reveal a change in texture during solution treatment, the area fraction of representative orientations were determined from EBSD data by using the samples annealed at 813 K for some short periods within 90 s and immediately water-quenched.
The near-{111}<110> recrystallization texture, which has a peak in the center of a {111} pole figure, is formed at relatively low reductions of AWR, while the {111} orientations hardly develop at all CR reductions under the condition of 40% AWR reduction and the main component is expressed by {013}<631>.
Here C90A25 means cold rolling to 90% reduction and asymmetric warm rolling to 25% reduction.
Fig. 10 Optical micrograph in longitudinal section for AZ31Mg sheet hot rolled to 30% reduction and asymmetrically hot rolled to 20% reduction. 50μm Fig. 11 (0001) pole density distribution for AZ31Mg sheets hot rolled to 30% reduction, asymmetrically hot rolled to 20% reduction and annealed at 573 K for 1800 s.
Online since: August 2012
Authors: Ariadne de Souza Silva, J.H. Araújo, J.B. Manuel, M.J. Diniz, Uílame Umbelino Gomes
The reduction of the particle size is very important to get better properties of the hard metal.
The reduction of the coercitive field with milling time increase can be related with the reduction of free cobalt in composite.
The reduction of density can be related with the appearance of the non magnetic phases and reduction the hardness is related the reduction of density.
The hardness increase with the reduction of the particle size (pores reduction), this also originates an increase in the coercitive field.
Third edition, publisher by International Carbide Data.
The reduction of the coercitive field with milling time increase can be related with the reduction of free cobalt in composite.
The reduction of density can be related with the appearance of the non magnetic phases and reduction the hardness is related the reduction of density.
The hardness increase with the reduction of the particle size (pores reduction), this also originates an increase in the coercitive field.
Third edition, publisher by International Carbide Data.
Online since: March 2015
Authors: Yang Li, Xiao Sheng Wu, Wei Ping Zhang, Wen Yuan Chen
The external memory interfaces of F28335 include 20 address lines, 16-bits of data lines, three chip select control lines and write control lines.
XZCS7 chip selecting signal can be used to map the collected data to Zone7, which starting address is 0x200000.
When SER/PAR pin is low, the chip works on parallel mode, and with W/B in low, parallel data line DB[15:0] can be used in data transmission with AD7656.
After statistical analysis of sampling data taken in different periods, it could be found that means of data pre-filter and filtered are respectively 8.40mV and 8.15mV, while standard deviations are respectively 4.01mV and 1.13mV, thus the standard deviation decreases by 71.8%.
[4] Preliminary Technical Data of AD7656[S] Analog Devices
XZCS7 chip selecting signal can be used to map the collected data to Zone7, which starting address is 0x200000.
When SER/PAR pin is low, the chip works on parallel mode, and with W/B in low, parallel data line DB[15:0] can be used in data transmission with AD7656.
After statistical analysis of sampling data taken in different periods, it could be found that means of data pre-filter and filtered are respectively 8.40mV and 8.15mV, while standard deviations are respectively 4.01mV and 1.13mV, thus the standard deviation decreases by 71.8%.
[4] Preliminary Technical Data of AD7656[S] Analog Devices
Online since: March 2011
Authors: Man Yin Hu, Yi Jing Jin, Yu Sun, Xiu Hong Wang
Simulation of boiler full load
The simulation is based on the existing data to set geometry model, through calculating Software setting the boundary conditions consistent with actual to conduct numerical calculation.
Fig. 2 the nephogram of vertical NOx mass fraction on catalyst layer under full load From the simulated data in the chart, the average of NOx mass fraction on catalyst layer under full load is 0.002414, with the denitration efficiency of 85.2%, more in line with the actual condition of 82%.
The concentration data of NH3 emission obtained by the software interception is 3.86mg/Nm3, and does not exceed the value of NH3 emissions allowed.
Simultaneously, the denitration efficiency will be increased correspondingly in the reactor, which is because when the gas volume reduces, NOx reduction will also reduce with it.
But note that when the boiler load is reduced, the reduction of flue gas temperature will affect the catalytic activity.
Fig. 2 the nephogram of vertical NOx mass fraction on catalyst layer under full load From the simulated data in the chart, the average of NOx mass fraction on catalyst layer under full load is 0.002414, with the denitration efficiency of 85.2%, more in line with the actual condition of 82%.
The concentration data of NH3 emission obtained by the software interception is 3.86mg/Nm3, and does not exceed the value of NH3 emissions allowed.
Simultaneously, the denitration efficiency will be increased correspondingly in the reactor, which is because when the gas volume reduces, NOx reduction will also reduce with it.
But note that when the boiler load is reduced, the reduction of flue gas temperature will affect the catalytic activity.
Online since: January 2010
Authors: H. A. Cortéz, V. H. Jacobo, A. Ortiz, Rafael Schouwenaars
Strain hardening will be described by means of experimental data.
In spite of giving a good aproximation of the data, the physical processes involved in recrystallisation are not reflected in the curves.
In all cases, fitting parameters took values which indicated that recovery was not active, based on the available data.
Substituting these data into the complete model (11) sgg=-37, srx=7.1, Qrx=61400 and, krx=91 MPa µm-1/2, with a residual standard deviation of 26MPa.
Isostrain sections through the 3-dimensional response surface, using the complete model with grain growth parameters fitted to metallographic data.
In spite of giving a good aproximation of the data, the physical processes involved in recrystallisation are not reflected in the curves.
In all cases, fitting parameters took values which indicated that recovery was not active, based on the available data.
Substituting these data into the complete model (11) sgg=-37, srx=7.1, Qrx=61400 and, krx=91 MPa µm-1/2, with a residual standard deviation of 26MPa.
Isostrain sections through the 3-dimensional response surface, using the complete model with grain growth parameters fitted to metallographic data.
Online since: June 2014
Authors: Hui Min Qiao, I- Shin Chang, Yan Xia Yang
Cleaner Production (CP) is a sustainable developing pattern and an environmental strategy based upon source reduction, under the context of rapid economic development, excessive resource utilization and consumption, fast depletion of natural resources, and severe degradation and deterioration of environmental quality.
Introduction In May 1989, United Nations Environment Program (UNEP) put forward the concept of Cleaner Production (CP), which was defined as the continuous application of an integrated preventive environmental strategy to processes, products and services to increase the overall ecological benefits and to reduce human and environmental risks, such as the conservation of raw materials and energy, the elimination of toxic materials and the reduction in the quantities and toxicity of wastes and emissions during processes; the reduction of negative impacts throughout the life cycle of the product: from raw material extraction to ultimate disposal; and the incorporation of environmental considerations into the design and delivery of services [1].
According to the statistical data, companies who have implemented CP and successfully past the assessment and acceptance of CPA are mostly allocated within seven industries, including Chemical Materials and Products manufacturing, Textile, Light Industries, Metal Surface Treatment and Heat Treatment Processing, Ferrous Metal Smelting and Rolling Processing and Non-Metallic Mineral Products Industries, shown in Figure 2.
Introduction In May 1989, United Nations Environment Program (UNEP) put forward the concept of Cleaner Production (CP), which was defined as the continuous application of an integrated preventive environmental strategy to processes, products and services to increase the overall ecological benefits and to reduce human and environmental risks, such as the conservation of raw materials and energy, the elimination of toxic materials and the reduction in the quantities and toxicity of wastes and emissions during processes; the reduction of negative impacts throughout the life cycle of the product: from raw material extraction to ultimate disposal; and the incorporation of environmental considerations into the design and delivery of services [1].
According to the statistical data, companies who have implemented CP and successfully past the assessment and acceptance of CPA are mostly allocated within seven industries, including Chemical Materials and Products manufacturing, Textile, Light Industries, Metal Surface Treatment and Heat Treatment Processing, Ferrous Metal Smelting and Rolling Processing and Non-Metallic Mineral Products Industries, shown in Figure 2.
Online since: October 2014
Authors: A. Rashid A. Aziz, Morgan R. Heikal, Wasiu B. Ayandotun
There was a reduction in the unburnt hydrocarbons (THC) and carbon monoxide (CO) emissions by 15% and 89% respectively, but the NOx emissions increased by 78%.
HC emissions were found to decrease linearly with increasing N2 dilution and for a given quantity of fuel, the emissions reduction was at a constant amount.
Table 1: Engine specifications Displacement volume 399.25 cm3 Cylinder Bore 76 mm Cylinder Stroke 88 mm Compression Ratio 14:1 Exhaust Valve Closed 350o BTDC Exhaust Valve Open 225o BTDC Inlet Valve Open 12o BTDC Inlet Valve Closed 132o BTDC Dynamometer Direct Current with maximum reading is 50 Nm The operation of the engine used for the experimental work was managed and controlled by a PC-based data acquisition and control system.
For the exhaust emissions there were significant reductions in the emissions of CO and THC while NOx was on the increase at about 20% CO2 proportion in the mixture.
These findings, if implemented, will assist sustainable developments in the country through reductions in the consumption of crude oil.
HC emissions were found to decrease linearly with increasing N2 dilution and for a given quantity of fuel, the emissions reduction was at a constant amount.
Table 1: Engine specifications Displacement volume 399.25 cm3 Cylinder Bore 76 mm Cylinder Stroke 88 mm Compression Ratio 14:1 Exhaust Valve Closed 350o BTDC Exhaust Valve Open 225o BTDC Inlet Valve Open 12o BTDC Inlet Valve Closed 132o BTDC Dynamometer Direct Current with maximum reading is 50 Nm The operation of the engine used for the experimental work was managed and controlled by a PC-based data acquisition and control system.
For the exhaust emissions there were significant reductions in the emissions of CO and THC while NOx was on the increase at about 20% CO2 proportion in the mixture.
These findings, if implemented, will assist sustainable developments in the country through reductions in the consumption of crude oil.
Online since: May 2011
Authors: Bang Wu Chen, Zhuo Hao Xiao
For example, field instruments for environment monitoring can give the environment monitoring center and sub center with real time data of the regional surface water or atmosphere or waste water or waste gas or noise.
At the same time, the environment monitoring system can reflect and judge the variables of environmental factors by integrating the data given by the field instruments.
At present, the measurement infrastructure of emission in China is weak, so the environmental department can hardly get the real data of emission of enterprises, and also can hardly track and verify the emissions trading among enterprises The third allocation process is the restructuring of pollution right.
The ultimate goal of emissions trading is the reduction and control of pollution.
For the realization of ultimate goals of emissions trading, we hold forth some measurements for the government and other organizations involved in emissions trading: First, governments at all levels should encourage companies with advanced technology of emissions control or with heavy task of emissions reduction to set up joint emission treatment plants in industrial development zone or industrial function zone or in city and town, with the emissions reduction result verified to be held by funders and technical side, and they can use it to offset their emissions reduction quota or trade in the market.
At the same time, the environment monitoring system can reflect and judge the variables of environmental factors by integrating the data given by the field instruments.
At present, the measurement infrastructure of emission in China is weak, so the environmental department can hardly get the real data of emission of enterprises, and also can hardly track and verify the emissions trading among enterprises The third allocation process is the restructuring of pollution right.
The ultimate goal of emissions trading is the reduction and control of pollution.
For the realization of ultimate goals of emissions trading, we hold forth some measurements for the government and other organizations involved in emissions trading: First, governments at all levels should encourage companies with advanced technology of emissions control or with heavy task of emissions reduction to set up joint emission treatment plants in industrial development zone or industrial function zone or in city and town, with the emissions reduction result verified to be held by funders and technical side, and they can use it to offset their emissions reduction quota or trade in the market.
Online since: December 2012
Authors: Abdallah Diha, Zakaria Boumerzoug
This material is submitted to successive reduction by cold wiredrawing process.
The specimen elongation (strain) was measured by an acquisition data computer.
Effect of stress Figure 1 shows a series of creep curves, plotted as creep strain versus time for aluminum drawn wire with a rate of reduction up to 92.45 %.
Creep curves of aluminum wire with rate of reduction up to 92.45% at (σ1 =88, σ2 =106, σ3=123 MPa) and T = 473K.
The test data show a significant dependence of the minimum creep strain rates on the stress value.
The specimen elongation (strain) was measured by an acquisition data computer.
Effect of stress Figure 1 shows a series of creep curves, plotted as creep strain versus time for aluminum drawn wire with a rate of reduction up to 92.45 %.
Creep curves of aluminum wire with rate of reduction up to 92.45% at (σ1 =88, σ2 =106, σ3=123 MPa) and T = 473K.
The test data show a significant dependence of the minimum creep strain rates on the stress value.