Advanced Materials Research Vol. 711

Abstract: Abstract. In this paper injection process for industry production is just a grey system which have problems of complex representation and discrete data. Orthogonal experiments have been designed to obtain the value of shrinkage and warp. The lower value of the two objects is better. After data obtained in experiments are dealt with by grey theory, relational degree had been calculated. With variance analysis the optimal level of the factors influencing the value of the two objects have been find out, then a optimal group of the process parameters has been obtained. Through simulation in computer, the warp is less than 0.5 mm, the shrinkage is less than 0.5%. The requirements of the product have been satisfied. In this method the factors had been considered before mould is tested comprehensively. Time and cost of product development have been decreased greatly. It is believed that the method is valuable in actual product.

Abstract: There are lots of corn straws left on the farmland every year in China. At present, the technologies of taking full advantage of corn stalks are not mature. In this paper, the method of acidic hydrolysis was used to decompose hemicellulose of corn stalk into xylose, L-arabinose, fructose, etc. HPLC was used to detect the concentration of monosaccharides in the hydrolyzate, at the same time the hydrolysis conditions were also optimized. The results showed that the optimum conditions were: the concentration of corn stalks 15%, hydrolysis time 3h. There were xylose, L-arabinose, fructose and glucose were detected in the hydrolyzate of corn stalks. The max concentration of xylose 23.1mg/ml was obtained at temperature about 160°Cand the max concentration of L-arabinose 19.4mg/ml was obtained at a relatively low temperature 130°C. As the temperature rising, the concentration of glucose was increased at first and then decreased; the concentration of fructose was increased in a small range in the whole range of temperatures investigated.

Abstract: In this research, the post weld heat treatment (PWHT) of duplex stainless steel (DSS) was study. The PWHT process can be affected by differing parameters. The specimen was duplex stainless steel UNS31803 grade sheet of 10 mm thickness. The PWHT parameters were analyzed by application of full factorial design. The factors used in this study were PWHT temperature of 650, 750, and 850 ^๐C with PWA time of 1, 2, 4 and 8 hours. The welded specimens were tested with micro vickers hardness and ferrite content testing according to ASTM E3-11 code. The result showed that both of PWHT temperature and PWHT time interaction on hardness and ferrite content for 95% confidential (P value < 0.05). The factor in most effect of hardness was the PWHT temperature of 850^๐C and PWHT time for 4 hour at the hardness of 277.73 HV. The ferrite was the most ferrite content for 77.39% resulted in corrosion resistance due to suitable of PWHT temperature 750 ^๐C and PWHT time for 8 hour. Finally, form PWHT process with the information was used choosing the appropriate for PWHT parameters to duplex stainless steel welds.

Abstract: This research was to study of gas tungsten arc welding (GTAW) welding parameters that affects to the mechanical properties of aluminum alloy AA5083 welding with GTAW. The full factorial design was experiment. The factors was study in type of polarity on alternating current (AC), direct current electrode negative (DCEN) and direct current electrode positive (DCEP), levels of welding current for 180,200,220 and 240 amp. The specimen to analyses the physical properties has microstructure and hardness of weld metal and heat affected zone. The result showed that type of welding current and levels of welding current interaction hardness at the level of confidence 95% (P-value<0.05). The factor hardness maximum of weld metal was alternating current at level of current 240 amp. and hardness of 136.53 HV. The factor hardness maximum of HAZ value was alternating current at level of welding 220 amp. and hardness of 169.43 HV. The welding parameters can result in increasing Mg₂Si intensity in parent phase. It can also be observed that Mg₂Si at the parent phase decreased due to high welding current in HAZ.This research can be used as information in choosing how to welding parameter for gas tungsten arc welding of aluminum alloy.

Abstract: Alloy X-750 also has excellent properties down to cryogenic temperatures high stability and strength at high temperatures. This reason the alloy is used in manufacturing of gas turbine hot components. The research was study the effect of post weld heat treatment (PWHT) parameter on hardness and microstructure. The specimen was Inconel X-750 grade sheet of 2.8 mm thickness. This 2³ factorial design was used in experimental various post weld heat treatment at 705 and 845°C for 20 and 24 hour including solution temperature at 1,000 and 1,150°C. The welded specimens were tested by hardness testing in fusion zone (FZ) and heat affected zone (HAZ). The result showed that both of solution temperature, PWHT temperature and PWHT time interaction on hardness of FZ and HAZ at 95% confidential (P value < 0.05). The PWHT temperature and PWHT time interaction effect was the largest. The factor showed in the hardness increase with the low level (-1) of PWHT temperature and PWHT time for the hardness while it trended decrease for the solution temperature. The microstructure was the γ amount and small size would result in high hardness. Experimental results showed that the solution temperature at 1,150°C, PWHT temperature 705°C PWHT time of 20 hours provided intensity of gamma prime (γ) and MC carbide resulting in higher hardness both in FZ and HAZ.

Abstract: This research was to study the synthesis of aluminum foam with pure aluminum and its mechanical properties. The synthesis varied at 1% - 5% of TiH2 and mixed with 99.7 % aluminum powder size of 44 µm. then compressed by hydraulic at 25, 30 and 35 tons in the diameter 27 mm, high 60 mm molded. The Aluminum foams were produced by using heat treatment at 800 °C for 10 minutes then cool to room temperature and tested its mechanical properties. The results showed that aluminum foams which lowest bulk density (0.958 g/cm³) was 2% TiH2 synthesized, compressed at 35 tons and highest bulk density (1.393 g/cm³) was 1% TiH2 synthesized, compressed at 25 tons. Moreover, the highest compressive strength (847 kg/cm²) showed at 2% TiH2 synthesized and compressed at 35 tons. Thus, this research contributes to a body of knowledge that informs the application of aluminum foam.

Abstract: To optimize the dyeing condition of cotton fabric modified with color media, the effects of dyeing time, temperature and amount of color media were studied in the paper. The results exhibited that the exhaustion of cotton fabric modified with color media increased greatly, even up to 97.1%. The optimal dyeing condition can be defined as follows: the dyeing time of 36 min, the temperature of 50 °C and the amount of color media of 5% (o.w.f).

Abstract: As the oil field enters into later phase of oil exploitation, more and stricter requirements have been put forward on oil tubes in terms of anti-corrosion performance in the oil exploitation, therefore, in this paper, a new compound processing method will be introduced, which carries out ion-nitriding and the plasma chemistry vapor deposition (PCVD) for oil tube inner wall. Through function extending of equipment specific to ion-nitriding of oil tubes, PCVD could also be carried out at the same time. Through the above compound processing, not only can the high hardness and the high-wearing feature of ion-nitrided oil tube be retained, but also the anti-corrosion performance can be improved substantially.

Abstract: Using APDL programming language, an appropriate finite element model is created and the moving cyclic loads of Gauss heat source are realized. From the detailed qualitative analysis of the results, the variety laws of temperature field in indirect SLS are obtained. Plot results at different moments, temperature cyclic curves of key points and the curves of depth of fusion and width of fusion on the set paths, are of important guiding significance for subsequent physical experiments.

Abstract: ST14 material around the back door window frames of the front bracket parts for the carrier, and to AutoForm stamping process finite element analysis software as a platform for ST14 experience of the material structure process simulation of material forming process, the analysis of the parts stamping process defects through repeated amendments of Part Process structure, to achieve the purpose of stamping process defects.