Advanced Materials Research Vols. 791-793

Abstract: As a new type of green material with excellent physical and chemical properties and mechanical properties. Basalt fiber are widely used in the field of civil construction. This paper focused on the use of basalt fibers to improve the mechanism of asphalt concrete, demonstrated the prospects and market value of the basalt fiber that are widely used in asphalt concrete

Abstract: Flame retardant properties of ammonium polyphosphate (APP) and its two kinds of microcapsules, MFAPP with a shell of MF resin and EPAPP with a shell of epoxy resin, were studied in styrene-butadiene-styrene rubber (SBS). The results indicate that the microencapsulation of APP leads to an increase in LOI in SBS compared with APP. When dipentaerythritol is incorporated into the SBS composites containing APP microcapsules, a further improvement in flame retardancy of the composites is observed. Moreover, thermal decomposition behavior and mechanical properties of the SBS composites are investigated.

Abstract: The precipitates in 850°C aging 2205 Duplex stainless steel were extracted by the method of carbon extraction replicas. The method makes precipitates disperse uniformly and the contrast between precipitates and matrix distinct. TEM(Transmission Electron Microscope), EDS(Energy Dispersive Spectrometer) and SEM (Scanning Electron Microscope) were applied for the observation of microstructure. The SEM micrographs were used for intermetallic size statistic, which revealed that the sizes of intermetallic increased with aging time.

Abstract: TiCo alloys are important biomedical materials for both scientific and technological interests due to their potential applications as hard tissue replacement (HTR). The microstructural characteristics of the alloys in this system are of both scientific and technological interests. This work presents the results of microstructural characterization of as-cast TiCo alloys using a combination of various experimental methods. The results confirm that there are two variants of the Laves phase TiCo₂, i.e. h-TiCo₂ and c-TiCo₂ exist in this system of as cast state. The eutectic reaction L(β-Ti)+ Ti₂Co is determined to be occur at at 23 at.% Co, 1020 °C. Four peritectic reactions, i.e. L+ TiCo Ti₂Co, L+ TiCo (c-TiCo₂), L+(c-TiCo₂) (h-TiCo₂) and L+Co TiCo₃ occur at 1058 °C, 1235 °C, 1210 °C, and 1190 °C, respectively. Eutectoid reaction (βTi) (αTi)+ Ti₂Co occurs at 9 at.% Co, 685 °C.

Abstract: The problem of application of the material selection optimization approach for structural-acoustic optimization is investigated. By introducing the stacking sequence hypothesis of metal material, the mechanical parameters of the material and plies number are defined as design variables; the mathematical model of material selection optimization for reducing acoustic power is established. Take a hexahedral box structure for example; the material selection optimization is carried out. The example shows that the vibration and acoustic radiation of composite laminated can be reduced by using material selection optimization method.

Abstract: This experiment made use of hand lay-up to generate nonwoven reinforced composites which used glass fiber nonwovens, glass fiber felt and PE hot rolling nonwovens as the reinforcement, thermosetting unsaturated resin as the matrix, and tested their tensile and bending mechanical properties, then analyzed mechanical properties by gray relative analysis. The results show that when glass fiber felt is used as reinforcement and its content greater than 60%, the comprehensive mechanical properties of the composite are the best. At the same time, we observed the tensile fractures to analyze the failure mechanism of the composites.

Abstract: Pb-free austenitic stainless steels were investigated by adding sulfur, rare earth (Re) elements and bismuth. The metallurgical properties, machinability and mechanical properties of both steels were examined. The results show that a significant amount of grey, spindle shaped inclusions were discovered in austenitic stainless steels, and they should belong to MnS inclusions containing bismuth element and rare earths oxide. The addition of S, Bi and Re to austenitic stainless steels improved the machinability. The machinability of steel B is better than that of steel A in a way. The mechanical properties of steel B are better than those of steel A, especially total elongation owing to the presence of rare earth elements. From the viewpoint of life cycle assessment, it is proposed that the development of Pb-free austenitic stainless steels containing S, Bi and Re is desirable.

Abstract: Along with the high-speed development of China's construction industry, building materials as the material basis of civil engineering construction, the quality of building materials is directly related to the quality of construction projects, so the good building materials quality, particularly important to detect and control work. In this paper, combined with the author's working practice, discusses how to do detection and control the quality of building materials should pay attention to the problem.

Abstract: The corrosion failure analysis of an SA210 steel used in high pressure evaporator tube is conducted by XRD, SEM, OM. The result shows that the corrosion products in the inner wall of the steel tube is Fe3O4, mainly caused by the residual water in the evaporator tube corroding its inner wall with oxygen after the hydrostatic test of the boiler, finally leading to the corrosion leak of the tube.

Abstract: The composite of carbon fiber reinforced polyethylene resin was prepared by using a twin-screw extruder. The effect of carbon fiber content on the tensile properties of the composite of carbon fiber reinforced polyethylene resin was researched. The tensile fracture failure mechanism of composite materials was analyzed. The experimental results indicate that with the increase of the content of carbon fiber in the composite material, the tensile strength and tensile modulus increase gradually. When the carbon fiber content in the composites is 4.02%, compared to the pure polyethylene resin matrix, the tensile strength and tensile elastic modulus is increased by 18.45% and 208.37%, respectively. With the increase of adding amount of carbon fiber and the carbon fiber volume fraction is less than 0.1 in composite material, the stress load subjected by carbon fiber is significantly increased, which is close to the linear relationship.