Search results

From the optical microscopy images (Fig.6), it can be seen that a large number of Al60V40 master alloy particles with sizes in the range of 25 to 50 mm and residual pores with sizes in the range of 1 to 10 mm are present in the sample produced by forging the compact of powder mixture without holding.
The microstructure of sample produced by forging the compact of MA powder without holding consists of equiaxed alpha grains (Fig. 6(d)).

Once the drying is completed, the salts were mixed thoroughly in order to get homogeneous mixture, and the powder mixture was wrapped in Al foil into number of small batches to form packets of convenient size and kept ready to be added to liquid alloy using plunger.
It can be seen from the microstructures that the Mg-Al-TiB2 composite show better refinement of grains compared to the unreinforced Mg-Al alloy.

Scanning electron microscopy showed that the average grain size tends to decrease slightly with an increase of the oxygen partial pressure ratio, reaching ~44.5 nm for 90%.
) (311) Si (333) (222) (111) Journal Title and Volume Number (to be inserted by the publisher) conduction.

In this work, with the proceeding of high energy milling, the milling reduced the particle size, thoroughly mixed the components, and increased the number of chemically active defect sites.
It can be seen that the products was contained agglomerates consisted of lots of fine grained particles.

There are a number of requirements put on natural materials suitable for the production of insulators to be used in construction.
Straw - these fibres were obtained by means of production line defibration from stems and stalks of threshed and dried grain crop

In the first place, the chains of lignosulfonate adsorbed at the surface of BFS grains hinder the dissolution of slag which is similar effect observed in the case of OPC binders [9,10].
Secondly, the number of charged sites in the backbone of lignosulphonate chain could play an important role.

It has been reported by a number of researchers that heat treatment could benefit modifying WC-Co deposits.
Comparison of the as sprayed and heat treated microstructure by SEM and TEM shows that after heat treatment some new phases are produced in the amorphous area, and WC grains are partly dissolved and mixed with cobalt matrix and produce new crystalline and dendritic phases[2, 5].

Introduction It is noted from these previous investigations [1-3] that the magnesium can modify the size and distribution of inclusion in steel, and grain of inclusion in tiny and uniform.
Fraction of inclusions with different size /% Average diameter Total Number 0~5µm 5~10µm 10~15µm >15µm <3µm Blank experiment No 1 87.90 11.29 0.81 0 64.52 3.091 124 No 3 89.90 9.18 1.02 0 63.27 2.991 98 Alloy 1 No 1 94.10 2.58 2.58 0.74 90.77 1.795 271 No 3 96.98 2.26 0.75 0 92.08 1.401 265 Alloy 2 No 1 74.84 16.67 5.97 2.52 61.01 3.700 318 No 3 98.67 1.32 0 0 95.15 1.212 227 Alloy 3 No 1 89.36 8.51 1.60 0.53 79.26 2.263 188 No 3 99.46 0.54 0 0 96.23 1.103 371 Pattern and composition analysis of inclusions- Fig. 4 show the pattern and composition of typical inclusions after Al-killed for 30 minutes, and the pattern and composition of typical inclusions after Al-Mg alloy added into the molten steel for 30 minutes is shown as Fig. 5.

Boron can dissolve trace amounts of boron, and the boron more than 0.01% can form boride and precipitate along the grain boundary, which results in the reduction in toughness.
The solubility of carbon in austenite at 1403K is follows: [C]=0.2244%， A large number of solid solution of carbon in high temperature austenite must cause the stability of austenite and the content of rest austenite in matrix increases restively after quenching.

Numerical prediction of this effect is thus very important but complex due to the numerous parameters involved: material properties, number of cutting steps, paths geometry, etc.
For example, in this context the development of more accurate constitutive material model (grain size modeling) can improve the bulk stress prediction in the forged component after the heat treatments.