Advanced Materials Research Vols. 712-715

Abstract: It is the precondition of material microstructure test to show the metallographic specimen microstructure clearly. Chemical etching method is most often used to display the metallographic microstructure, which is to put the sample into the proportioned etchant, the structure will be revealed because of the electrochemical effect between the surface of each structure unit and the etchant. According to the characteristics of ferrosilicon alloy material, configure several kinds of etchant, and by comparing the changes in the microstructure determine the best etchant of ferrosilicon alloy sediment.

Abstract: As a floppy alloy, the silicon steel with a content of Si of 6.5% has been paid much attention due to its maximum magnetic induction and minimum iron loss. However, the manufacture has been limited largely by conventional technics. By comparison, the silicon steel with a lower silicon content of 0.1%-4.0%, which was manufactured by conventional technics, also has a limited application. In this work, Molten Salts Electrodeposition has been employed to produce Fe-Si alloy. Technological parameters including influence of Molten Salts Electrodeposition technic in aggradation layer appearance and distribution of silicon content along with thickness. The results also show that the size of superficial particles on deposit layer increased gradually, the thickness of deposit layer was proportional to the current density on the deposit layer of Fe-Si.

Abstract: Combining ferrosilicon alloy with electro-deposition method, the main phase in the deposit layer is Fe3Si, and the substrate texture is mainly distributed in γ orientation line, {111}<110> and {111}<110> is the key component. The sample is mainly the cubic texture of {100}<001> and {111}<112> in γ orientation line, with a small amount of Goss texture. {111} texture share in the sample decreases.

Abstract: The phase transformation and magnetic properties of Heusler-type Ni₅₀Mn_50-xIn_x (x=10~16) ferromagnetic shape-memory alloys have been systemically investigated by differential scanning calorimetry and vibrating sample magnetometry. It is found that the phase transition temperatures show a linear relationship with the In concentration and the curie temperatures of austenite phases are not sensitive to the alloy composition. The existence of large magnetization change during the magneto-structural transition is the origin of magnetic-field-induced transformation effect.

Abstract: In the present study, deformation heating generated by plastic deformation and its effect on the processing maps of Ti-15-3 titanium alloy were investigated. For this purpose, hot compression tests were performed on a Gleeble-3800 thermo-mechanical simulator in the temperature range of 850-1150 °C and strain rate range of 0.001-10 s¹. The temperature rise due to deformation heating was calculated and the as-measured flow curves were corrected for deformation heating. Using the as-measured and corrected flow stress data, the processing maps for Ti-15-3 titanium alloy at a strain of 0.5 were developed on the basis Murty‘s and Babu’s instability criteria. The results show that both the instability maps based the two instability criteria are essentially similar and are characterized by an unstable region occurring at strain rates higher than 0.1 s¹ for almost the entire temperature range tested. The unstable regions are overestimated from the as-measured data due to the effect of deformation heating, indicating a better workability after correcting the effect of deformation heating. This is further conformed by the analysis based on strain rate sensitivity.

Abstract: In this paper the precipitations in the heavy plate of VN micro-alloyed steel has been studied. Pase analysis experiment has been done to study the precipitation character. The precipitations have been observed by TEM. Physicochemical phase analysis has been employed to explore the particle structure and the size distribution.

Abstract: This article studies through experiments the anti-wearing property of the organic compound of rare metal zirconium as extreme pressure (EP) additive for lube oil. It proves the extreme pressure (EP) anti-wearing property of the rare metal zirconium is far better than that of traditional lead. We have developed a new type innocuous and highly efficient EP anti-wearing additive the organic compound of metal zirconium.

Abstract: The wear behavior of different plant abrasive to 45# steel was studied by using an abrasive rubber wheel tester. The worn surface of the frictional samples morphology was observed by using Scanning Electron Microscopy, and the wearing mechanism of different abrasive to 45# steel was analyzed. The results show that: on the experiment conditions, the wear loss from big to small is alfalfa abrasive, corn abrasive and wheat abrasive, and the wear rules of corn abrasive and wheat abrasive are similar, but the wear loss of alfalfa abrasive is much higher than the former two. The wear dominant mechanism of the wheat abrasive to 45# steel is mechanical polishing, the wear dominant mechanism of the corn abrasive to 45# steel is mechanical polishing and adhesive wear, the wear dominant mechanism of the alfalfa abrasive to 45#steel is micro-cutting and adhesive wear.

Abstract: Single pass hot rolling was adopted to form Goss texture at subsurface layer after hot rolling in twin-roll cast oriented silicon steel strip. It is found that the intensity of Goss texture is affected obviously by rolling reduction and finishing temperature. Goss texture originates from adjacent texture components, and rarely from {100} component. An appropriate rolling temperature and reduced initial {100} texture are beneficial for generating sharp hot rolling Goss texture at relatively low reduction.

Abstract: The forging steel of grade E and casting steel of grade E are usually applied to making train coupler. The fatigue property tests have been carried out for the forging steel of grade E and the casting steel of grade E by using the up and down method and grouping method in the paper. The two kinds of steels fatigue limits have been obtained with the up and down method. With the grouping method, the P-S-N curve equations of high-cycle fatigue have been obtained. The confidence level is 90% and the probabilities of failure are 10%, 20%, 30% and 40%. The test results show that the fatigue property of the forging material are superior to the casting apparently . To some extent, the test results are valuable for fatigue reliability designating of train coupler.