Search results

For instance, almost for all grades of heat-resisting steel the most used was nitriding having rather great number of varieties [2].
As a rule, reagents in SHS processes are used in form of fine-grained powders, liquids and gases.
At the bottom the layer is created due to contact of melted tungsten carbide grains.
The closer to the surface, the larger thickness of interaction melting zone and smaller size of initial carbide grains.

The heating and cooling rates i.e. the temperature gradients in the process are high, resulting in a fine-grained microstructure.
The associated universal handling system needs a highly variable work space and a sufficient number of handling axes that make the treatment of small parts for example from medical technology or mold tool production as well as large parts for example gas turbine components possible and permits lot sizes from single pieces to larger series.
This was done in four layers, with the already mentioned X42 Cr13 metal powder as deposit material. 4 LASER COATI'G Laser hard facing applications make use of a favourable high temperature gradient leading to a fine-grained morphology of large hardness with good durability.
The deposited material is characterised by a fine-grained structure, a high density and a perfect adhesion due to the enhanced metallurgical bonding.

Furthermore, superplastic property may be achieved by reducing the grain size for thermal mechanical processes (TMP).
The grain size in most materials is less than 10µm, but sometimes reaches 20µm.
Hence the finer atomization of the molten metal and its impact upon the solidification processes and the grain size is highly concerned.
It would reduce the number of bigger droplets and produced a lot of smaller droplets in the spray jet.

Table 1 Factors and their coded levels in response surface analysis Independent variables Symbol Factor level 1 0 -1 Solution pH X1 6 6.5 7 Acting time（h） X1 3 4 5 Acting temperature（℃） X3 25 30 35 Table 2 Experimental design and results for response surface analysis Test number X1 Solution pH X2 Acting time（h） X3 Acting temperature Increment of hydrosulphonyl （μmol/g） Starch mass （g） 1 6 3 30 65.5649 5.4295 2 6 5 30 67.5265 5.4696 3 7 5 30 68.4103 5.5272 4 6 4 25 65.4579 5.5488 5 7 4 35 67.8744 5.006 6 6.5 3 35 66.2553 5.0773 7 6.5 4 30 71.7246 6.5682 8 6.5 4 30 69.9016 6.8907 9 7 4 25 65.6333 5.6447 10 6 4 35 66.679 5.3815 11 7 3 30 66.2347 5.0696 12 6.5 5 25 66.961 5.4423 13 6.5 4 30 71.2463 6.5898 14 6.5 4 30 72.3624 6.6879 15 6.5 3 25 65.7646 5.8434 16 6.5 5 35 68.4122 5.813 17 6.5 4 30 72.0132 6.6231 Variance analysis Variance analysis of sulfhydryl increment as response value The results of response surface analysised by Design-Expert software Box-Behnken program.
But because the L- cysteine molecules is large and the solubility is poor, permeate speed of internal corn grain was slower than sulphurous acid.
Corn sour slurry can inhibit the growth of spoilage bacteria and promote swelling of maize grain.
Zhengzhou grain College.p.92-95(1986) [21] L.L.

This number is expected to continue to increase in the next few decades.
The advantages of investment casting are that it can form complex castings, the details of the resulting castings are very fine and thin parts can be produced, dimensional accuracy is very good, does not require advanced machining, can control grain size, grain orientation, and directional solidification.
Shrinkage Porosity Three factors are taken into consideration in assessing the quality of the castings, namely the porosity, gas inclusions and grain size[25].

In metallurgy and materials engineering, a number of phase transformation in solids like precipitation, oxidation, creep, annealing, homogenization, etc. are brought about by the process of diffusion.
Light metals are generally defined as metals with relatively low densities, atomic weights, or atomic numbers.
In metallurgy, for example, a light metal may be defined on the basis of density, whereas in physics the distinguishing criterion might be atomic number (or atomic weight), while a chemist would prefer to chemical behaviour.
Concern with aspects of weight saving should not obscure the fact that light metals possess other properties of considerable technological importance, e.g. the high corrosion resistance and high electrical and thermal conductivities of aluminium, the machinability of magnesium, and extreme corrosion resistance of titanium.[5–7] Titanium has a number of features that distinguish it from the other light metals and which make its physical metallurgy both complex and interesting.
The fracture features along TiA side and SS side predominantly dominated by the slightly faceted appearances of “river marks” due to the changes in the orientation of the cleavage planes operating from grain to grain; hence, it confirmed that the DAJs processed at higher bonding temperature were undergone majorly brittle fracture of intergranular mode during tensile testing.

The value of air permeability can be adjusted by changing the diameter and number density of the polymer wires.
Such a result might have been caused by excessive grain growth at a higher sintering temperature.

Large number of loss circulation will greatly impact the drilling cost and rig time.
The generated foams create voids in the cement grain which reduce the compaction of cement particles.

The necessity for high performance and lightweight structures and the tendency of incorporating an increasing number of tasks in each part can be made to happen by coalescing various materials into a multi-material hybrid structure.
The fractograph (Fig. 13a) had signs of different grains getting fractured through them (transgranular fracture) separation (see, white colored rectangles in Fig. 13a) between different grains have white coloured boundaries.
Some indications of tear up (showed using black circle in Fig. 13d) through few grains were noticed along SS side (Fig. 13d).
The fractograph (Figs. 13e and 13f) showed signature of tear up (black circle in Figs. 13e and 13f) through few grains along both Ti6Al4V and SS sides, which indicated that DCJs processed for 120 min showed transgranular fracture behaviour.
Different grains were fractured through them (transgranular fracture phenomenon) and were separated through the white coloured boundaries (identified using white colored boxes in both Figs. 13e and 13f).

A number of energy enterprises have been privatized and many of them have been restructured.
There are also a number of small HPP operating in Kazakhstan.
Kazakhstan is producing and exporting different crops with average grain yield of 17.5 – 20 Mt.
There are a number of large resources of middle- and low-temperature thermal water in Kazakhstan.
The law also provides for a number of incentives for these generation companies, including feed-in tariffs and connection of new facilities to the existing power grids.