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By simulating at 860℃(initial grain size is below 200μm) with JMATPRO, the TTT curve and CCT curve of the materials were obtained.
Results of thermal stress field   Enter thermophysical properties parameters of as-cast 42CrMo steel, grid number divided 40,000, atomic concentration 0.44, and cooling rate according to the corresponding values derived from the actual cooling rate curve of research on pure AQ251 quenching liquid by Kang Xichun [5].

The fill materials are: a crushed quarry limestone, 80-120 mm in grain size for the front and back layers cells, and a sand-scrapped tires mixture for the kernel layer cells.
Measurement device In order to understand the mechanical behaviour of these structures under dynamic loading, a large number of different types of measurement devices are installed.

Mining coal seam roof and floor condition: direct roof is 17 ~ 21m with silty mudstones and dark grey, shale structure and massive tectonic, brittle, local containing vegetable root fossils, unidirectional compressive strength 13.2 ~ 17.3 MPa, the coal seam average 5.1 m , the above layered average 2.4 m, the below layered average 2.3 m, unidirectional compressive strength 10.1 MPa, intermediate 0.6 m mudstone clip bottles; pseudo bottom 1.4 m mudstone, black, brittle, unidirectional compressive strength 4.2 ~ 9.7 MPa, direct bottom 2.0 m, fine-grained sandstone, dark grey, calcium cementation, more hard, Basic bottom 5.0 m mudstone, black, denser, lump, unidirectional compressive strength 8.7 MPa, belongs to the typical "three soft" strata according to observation in the region, and its surrounding rock loose circle is 2.2 m, large loose circle V class, very soft rock.
It depends on the size of the working pressure of pumping stations (30MPa), pillar number and the column cylinder lumen.

Makar et al [4] tried to distribute CNT bundles across cement grains, and characterized the interaction between CNT and hydrated product in 2004.
As known, the main factors affecting the conductivity of composites are the contact resistance and the number of conductive netlike pathways.

The main advantages are low welding energy, which enables one to obtain welds of smaller sizes, and total process automation, which allows to obtain analogical welds in the number of connections.
Chemical composition and tensile properties of the base steel in Ttest =20 OC 13CrMo4-5 C Mn Si P S Cr Ni Mo Cu 0.08-0.18 0.40-1.00 0.35 0.025 0.010 0.70-1.15 0.30 0.40-0.60 0.30 Re [(MPa] Rm [MPa] A5 [%] KV [J] 300 450-600 19 >31 Hardness distributions and microstructure of material in joints At the moment of delivery, steel 13CrMo4-5 had a ferritic-perlite-bainitic microstructure with a grain size of 12–15 mm (Figs. 1).

In Brazil, the number of studies on this theme is even smaller, e.g., the studied by López et al. [2] and Miranda Jr. [4].
Results and Discussion Grain size distribution and slump test Figure 1 (a) shows a comparative graph of the sand and waste glass particle size distribution.

Introduction The interaction between a material and hydrogen plays an important role in quite a number of engineering and scientific fields.
As can be seen on this micrograph, this alloy contains ferrite grains and cementite.

Therefore, the bond of the cBN grinding wheels must have a high strength, wear resistance and good grain retention properties.
Experimental procedures V-EPC processing of cBN /austenite-bainite ductile iron composite samples consists of a number of steps as shown in Fig.1.

This situation is mainly due to the complexity of the grain structure of this material which is unlike some ferrous material that has a predictable behavior upon applying a certain set of parameters.
In the end the total numbers of 16 experiments were carried out .The complete design is shown in Table 2.

., Cr-Ni alloy coatings especially obtained by electrodeposition method have been the subjects of investigation by numbers of researchers [1].
However, the crystal grains of Cr-Ni deposits will coarsen if annealing temperature is too high, leading Cr-Ni coatings to be cracked, soften and more corrosive [12].