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In this study the different factor of this method was optimized by micro-structural investigation on the Al-A356 alloy.
Introduction If a metal alloy is conventionally cooled down in to the semi-solid state without mechanical agitation, the primary phase solidifies with a dendritic structure.
Porosity and segregation are the most common defects that affected the mechanical properties of castings.
Today semi-solid metal (SSM) has established itself as a scientifically sound and commercially viable technology for production of metallic component with high integrity, improved mechanical properties, complex shape, and tight dimensional control [1, 2].
Different factors would affect on the shape and size of solid particles: 1- BN spray coating because of its nucleation site and easily separation of nuclei, and also control the heat transfer through cup's wall was the best coating. 2- 40cm height of pouring make suitable turbulence in the melt and continuity in melt flow. 3- 50sec pouring duration not only make high enough turbulence but also the duration of turbulence will be acceptable. 4- 700°C pouring temperature also was the best pouring temperature with nucleation and viscosity (turbulence on the melt) approaches.

During the process of rapid prototyping based on robotic pulse MAG forming, the coefficient of weld reinforcement is crucial to the geometric accuracy and mechanical property of metallic parts.
Introduction Metal forming technology based on welding technology has lots of advantages such as simple equipment, high production efficiency, shaping tightness and good mechanical properties [1-7].
Their factors and levels were listed in table 1.
The range analysis results listed in Table 2 show that the order of the significance (from high to low) of factors which affect the coefficient of weld reinforcement is arc length correction, welding speed, wire feeding speed and loop inductance.
These factors have significant influence (97.8%) on coefficient of reinforcement.

Another factor affecting the structure’s strength is the infill pattern.
These affect the internal structure of the materials which may affect the mechanical behavior of the product [9].  
Effect of Infill Patterns on Mechanical Properties.
Fig. 2 presents the effect of various infill patterns on the mechanical properties.
The mechanical properties are summarized in Table 3.

An important problem for plastic injection moulding companies is the deterioration of mould nests due to several factors such as wear and tear caused by heavy use, corrosion, misuse, etc.
These defects, even small ones, can affect the injection moulded product.
The service life of moulds depends on many factors such as the quality of the materials of the components, the heat treatment, the technical design, the manufacturing process of the components, the handling by operators.
The deposited material has good metallurgical properties and forms a good bond with the basic material, post-deposition heat treatments can be applied and the equipment used ensures complex geometric shapes of depositions.
Although the advent of high-performance processes has facilitated more efficient die repair, the multitude of influencing factors requires special attention and makes the necessity of depth studies for process selection and determination of the best process parameters.

Environmental condition variance in to soil mass behaviour ' s influence also more and more of came in for occupation natural attention , Fang xiao yang[1] thought nowaday geotechnical engineering theory and method primarily gist mechanical energy determinate, mechanical energy to geotechnical engineering behaviour play a central role , yet in the process of time, earthy property no longer except by mechanical energy ground control , environmental energy ground factor like wetting and drying cycle grade would change soil grain property, thereby change earthy engineering properties , just this kind of influence affect take on a long term.
The laterite resource that is widely distributed in Yunnan,seriously threaten to the safety of laterite structure and ecological environment and sustainable development Because by the various forms of pollution.In engineering, contaminated by acid clay, soil strength significantly reduced, leading to instability or destruction of superstructures, triggering a series of engineering accidents.Therefore, research is contaminated with acid laterite contamination mechanism to stabilize the construction quality traits, protecting the environment is important, but also for taking reasonable and proper remediation measures provide theoretical support. 1 Experimental program 1.1 Pollution and soil samples In this experiment, Kunming Huangtupo smelter basalt laterite has been as the research object, the election HCl as a source of contamination.Press the "Specification of soil test" measured physical properties indicators of basalt laterite in Table 1: Table1 The index of physical properties
Tab 4 The compressibility coefficient of acid pollution laterite Unit: MPa-1 Curing time/d concentration of hydrochloric acid/% 0 1 3 7 8 0 0.174 0.361 0.329 0.313 0.352 1 0.173 0.399 0.359 0.371 0.404 4 0.175 0.226 0.215 0.261 0.278 7 0.172 0.269 0.234 0.291 0.395 14 0.175 0.340 0.340 0.380 0.550 30 0.172 0.361 0.329 0.313 0.352 As can be seen from Table 4, pollution soil samples in the case of the same curing time, compared with plain laterite, acid laterite contamination after the compression factor with the increasing concentration of acid added first increases, then has been reduced, and finally increased variation.
Hydrochloric acid is added in the same proportion as the case of acid pollution on laterite after compression factor must be greater than the plain clay compression factor, and with the specimen curing time, the acid pollution laterite compression factor also increases first, then there the decreased, and finally the variation of increase. 2.3 Mechanism Analysis of hydrochloric acid contaminated laterite After adding hydrochloric acid into laterite, hydrochloric acid affect laterite particles and the corrosive between particles of the coupling , corrosion process can be divided into corrosion stages, a salt phase and the dissolution phase.corrosion stage is the process that the laterite oxide dissociate into cations when initial hydrochloric acid was added to ; chloride salt phase represents reaction of chloride ion with the cationic salt in the process; dissolution stage is the soluble salt formed in the process of gradually dissolved.
(2)The compression factor of Acid contaminated laterite is to be greater than prime laterite, and with the increase of acid concentration and curing time, the acid pollution laterite compression factor both showed increases first and then been reduced, and finally increases the variation

Following by a large plastic deformation and a higher temperature at the processed surface layer, there forms a non-uniform heat-mechanical coupling stress field, this field has a great impact on the original physical and mechanical properties.
Foreign scholars using finite element software, have done a lot of emulation about non-continuous chip formation process, and the simulation about the factors (tool friction, wear, chips and temperature) affecting the surface residual stress.
(5) The cutting width effect on residual stress are not similar with other factors.
The influence factors of the residual stress is complex and changeable, any factors of the machining conditions can affect the size and distribution.
The residual stress of machined surface has been affected by many factors, the mechanism is complex and the mutual coupling is a very complicated problem.

These influences have relationship with many factors.
By comparing and evaluating the main influence factors, provide basis for choosing the best carburizing and quenching process.
Affecting Factors Heat treatment deformation of gears is affected by many factors, concluded to the following four aspects.
Obviously, choose appropriate quenching oil is very important to control the deformation properties after processed.
Due to the varieties and properties of quenching oil used are different, get different results is understandable.

Vibration and noise problems not only affect the crew's work and life, but also affect the performance of vessel and the high-tech equipment on board.
MR used on the vessel not only must have excellent damping properties, but also meet the environment of the vessels, the marine corrosive environment.
Mechanical Engineering Handbook(Second Edition)[M].
Beijing: Mechanical Industry Press, 1996:4-248
Research on Dissipation and Fatigue properties of Meral Rubber Material at High-low Temperature [D].

Microstructure, Densification and Mechanical Properties of TiB2-TiC-NiAl Ceramic-Based Composite Weiguo Wang, Lei Zhang and Xiaoliang Zhang Science Research Department, Mechanical Engineering College, Shijiazhuang, China Wangweiguo2015@aliyun.com Keywords: TiB2-TiC composite; densification; microstructure homogeneity; composite additive Abstract.
Recently, Zhao et al [2] introduces combustion synthesis into high gravity field to induce thermal explosion reaction, successfully prepared near-full-density TiC-TiB2 composites with fine-grain even ultra-grain microstructures by liquid forming and rapid solidification, and the selection of the additives was considered to one of key factors affecting the microstructures and properties of solidified TiC-TiB2 composites.
Hence, by introducing Ni-Al composite additive into the primary system of Ti-B4C and changing its mass fraction, a series of TiC-TiB2 composites are prepared by combustion synthesis in high gravity field, and effects of the composite additive on densification, microstructure and mechanical properties are discussed.
Summary By introducing and increasing Ni-Al composite additive in Ti-B4C primary system, a series of TiB2-based ceramic composites were prepared by combustion synthesis in high gravity field, and effects of Ni-Al composite additive on microstructure, densification and mechanical properties were discussed.
Chrysanthou, TiC-TiB2 composites: A review of phase relationships, processing and properties, J.

The study aims to investigate the influence of various factors, such as geometry, boundary conditions, iterative processes, displacement of points in space, and loading on the accuracy and efficiency of the obtained numerical solution.
Chen, Microstructure, mechanical properties and machinability of particulate reinforced Al matrix composites: a comparative study between SiC particles and high-entropy alloy particles.
Lu, Influences of impact energy on the densification and mechanical properties of powder metallurgical Fe–C–Cu preforms during a powder-forged process.
Ruban, Investigation of the properties of powder materials using computer modeling.
Wen-zhi, Tensile properties and microstructure of rheo-diecast 7075 alloy prepared by serpentine channel process.