The invention relates to a hypereutectic Al-Si alloy piston material. The Al-Si alloy comprises the following chemical components by weight percent: 24 to 26 percent of Si; 0.5 to 1.0 percent of Cu; 1.5 to 3.0 percent of Ni; 0.5 to 1.0 percent of Mg; 0.15 to 0.25 percent of Mn; 0.45 to 0.55 percent of Fe; 0.5 to 1.0 percent of Zr; 0.2 to 0.5 percent of Ti; and the balance of Al. When the Al-Si alloy is smelted at a temperature of 850 DEG C and the temperature of the smelted Al-Si alloy is reduced to between 720 and 760 DEG C, a phosphorous agglomerated modifier and a Ce-rich mixed rare-earth modifier are pressed in under the protection of nitrogen, heat preservation is carried out for 30 minutes, C2Cl6 is used to degas, the obtained product is stirred, standing is carried out on the mixture, slagging-off is carried out on the standing mixture, and finally pouring is carried out and the casting is subjected to T6 heat treatment, wherein the phosphorous agglomerated modifier comprises the following components in percentage by mass: 40 to 50 percent of phosphorous powder; 20 to 30 percent of aluminite powder; and 20 to 40 percent of potassium fluoborate. The volume stability is guaranteed and the thermal expansion coefficient is reduced by improving the content of Si. And the normal-temperature and high-temperature tensile strengths of the piston are improved by improving the addition of thermal intensity elements and compound modification.

Hypereutectic Al-Si alloy piston material

A ternary near eutectic alloy of Ni, Ti, Cr is described having a relatively low melting temperature of approximately 1230 deg. C. or less, suitable for fusing cracks in turbine blades and vanes without substantial risk of cracking during the repair process. Such an alloy is suitable for low temperature joining or repair of turbine blades since it contains the same components as typical turbine blades and vanes without foreign elements to lower the melting point of the repaired material or adversely affect the mechanical properties of the repaired component. Exclusion of boron eliminates the formation of brittle boron compounds, detrimental to the properties of the repair or seam.

Ni-ti-cr near ternary eutectic alloy for gas turbine component repair

The invention provides a preparation method of a cocrystallized Al-Si alloy piston material According to the preparation method, on the basis of ZL109 alloy, by adjusting the alloy constituents and the alloy micro constituents such as V, Zr, P and the like and strictly controlling the deterioration technology, a novel cocrystallized Al-Si alloy piston material which is high in intensity and low in thermal expansion coefficient can be prepared, a recrystallization texture can be thinned by Zr and V, the deterioration treatment can be carried out by adding P, and an Al-P black core can be formed, so that the heterogeneous nucleation of primary crystalline silicon can be promoted, and the primary crystalline silicon can be thinned, wherein the average grain size is about 12mu m The alloy of the preparation method has the characteristics of being good in high-temperature performance, high in hardness, small in thermal expansion coefficient, good in abrasive resistance and the like, thereby being better accordant with the requirement of a high-performance engine piston for a vehicle

Preparation method of cocrystallized Al-Si alloy piston material

The invention discloses a method for purifying aluminum and an aluminum alloy melt, which comprises the following steps: adding raw materials into a refining furnace; heating the raw materials to 730-760 DEG C to be made into a melt, and then adding a first refining medium into the furnace; after smelting the melt for 20 minutes, then keeping stand for 30 minutes, and then skimming a slag material on the surface layer of the melt; continuing to heat the melt in the refining furnace to 740-770 DEG C, and then adding a second refining medium into the furnace; then repeating the smelting process of the smelt; after finishing the process, putting the smelt into a standing furnace to keep stand for 30 minutes, then putting the melt into a degassing device, and adding an external refining medium into the degassing device; filtering the smelt after being degassed by a filter, and removing fine particle impurities by filtering; and then putting the smelt after being filtered into a crystallizer to be crystallized, and finally making an aluminum or aluminum alloy finished product. The method has the advantages of high purification efficiency, no side effects, low burning loss and little waste, and can make a high-quality melt.

Method for purifying aluminum and aluminum alloy melt

An aluminum alloy for near net shaped casting of structural components is disclosed. The alloy contains 2 to 10 wt.% Zn, 0.5 to 5 wt.% Mg, 0.5 to 5 wt.%) Fe, optionally Cu, Ti, Sr, Be, Zr, V, Cr, Sc, Na, Si, Mn, Mo, B, and Ni, with balance aluminum. The alloy may be subjected to heat treatment selected from the group consisting of solutionizing, incubation, aging, and two or more heat treatment steps.

Aluminium alloys for structural and non-structural near net casting, and methods for producing same

The invention relates to a high strength heat-resisting hypereutectic aluminium-silicon alloy, belonging to the field of metallurgical technology The hypereutectic aluminium-silicon alloy comprises the components according to the weight percentage: 170-190% of silicon, 10-20% of copper, 03-07% of magnesium, 05-10% of nickel, 05-10% of ferrum, 03-07% of manganese, 0-04% of zirconium, 0-028% of cerium, 0-012% of lanthanum, 0-002% of praseodymium, 0-008% of niobium, 05-10% of chromium, 03-07% of molybdenum, 007-015% of phosphorus, less than 05% of impurities and rest of aluminum A method for preparing the high strength heat-resisting hypereutectic aluminium-silicon alloy comprises: the aluminium is heated to be melted, and then added with other metals to be melted; the melted mixture is added with alterative and refining agent for refining or blown with argon for refining; then, the obtained product is processed by pouring and heat treatment The method has simple technique and low cost; the hypereutectic aluminium-silicon alloy prepared by the method has higher temperature mechanical property compared with the existing hypereutectic aluminium-silicon piston alloy with other trademarks at home and abroad

High strength heat-resisting hypereutectic aluminium-silicon alloy and preparation method thereof

An edge detection method adopting smoothness-potentiation-edge detection-size extraction can not exactly extract deposition billet size during a real-time detection of the jet deposition billet size, because the shape of image edge is mutated after the edge detection or a breakpoint exists, and Bezier in computer graphics is applied to the real-time detection of the prismatical jet deposition billet size to repair deposition billet edges, and the image detection method of deposition billet size is changed into smoothness-potentiation-edge detection-edge repair-size extraction The key technology is the repair to deposition billet edge image, and the Bezier curve fitting technology is adopted to complete edge repair of deletion and mutation of the deposition billet images The implementation proposal comprises: in the first step, splitting the deposition billet into four zones; in the second step, searching edge points in each zone and selectively recording; in the third step, completing the edge repair by utilizing the Bezier curve in each zone The test results of the method show that size fluctuation acquired by treated image is smaller and errors caused by size detection from the edge breakpoint are eliminated

Method for repairing edge contour image of columnar injection deposition blank

The invention relates to a semi-solid extrusion of hypereutectic Al-Fe alloy, and a heat treatment method, belonging to the technical field of extrusion and semi-solid shaping The method comprises preparation of semi solid slurry and design of technological parameters of semi-solid shaping The alloy comprises chemical components by weight percent: 40-60 % of Fe; 30-50 % of Cu; 30-40 % of Zn; 05-15 % of Mn; 04-15 % of Mg; and the balance being Al Purposes of component design are to eliminate harmful effects of coarse Al3Fe phase by using alloying, and a shaping technology is extrusion molding by using semi solid after an alloy melting The technology can realize characteristics of good wear and heat resistance and high strength of aluminium alloy, and simultaneously has advantages of short flow, low energy consumption, high quality and near net forming

Semi-solid extrusion of hypereutectic Al-Fe alloy, and heat treatment method

In original Zernike moments subpixel edge operator, ideal step edge model is chosen for calculating four parameters of a pixel point, and therefore principle deviation is caused by edge model. In order to discuss the effect of principle deviation on edge location, sampled edge model is chosen for calculating edge parameters, principle deviation of edge translation l is derived based on Zernike moments edge detection theory, and modified formula of l is given for Zernike moments operator with masks of 5 × 5 size. Both theory analysis and testing result demonstrate that principle deviation is zero when edge translation l is limited in central pixel of a sampled window. In another case, the modification of l should be considered, which results in edge location accuracy of non-subpixel level for this subpixel edge operator.

Analysis of principle deviation of subpixel Zernike moments operator

A fuzzy controller (FC) was developed to improve deposit dimension accuracy in spray forming process, fuzzy rules of FC were extracted from experimental sample data by dynamic clustering method. Simulation results show that fuzzy controller is available to regulate deposit dimension, main advantage of FC is it has a stronger adaptability for nonlinear process control than PID controller, and FC of identical structure has satisfying control performance for different predetermined target values. FC closed-loop control experimental results show that average deposit thickness is 5.22m in steady growth period, average error between actual size and 5.5mm target value is 0.28mm, and RMS (mean square root) is 0.31mm.

Rongde Li

Papers

High strength heat-resisting hypereutectic aluminium-silicon alloy and preparation method thereof

Method for repairing edge contour image of columnar injection deposition blank

Semi-solid extrusion of hypereutectic Al-Fe alloy, and heat treatment method

Analysis of principle deviation of subpixel Zernike moments operator

The Extraction of Fuzzy Rules and Control for Deposit Dimension in Spray Forming Process