5 results about "Refined grains" patented technology

The invention discloses a method for optimizing parameters for a steel pipe expanding process by using a thermal simulation experiment technology. The method comprises the following steps: S1, sample preparation: cutting out a plurality of cylindrical thermal simulation samples from a target steel pipe; s2, designing a scheme, namely setting a plurality of groups of process parameter combinations including a heating temperature T, a heat preservation time t, a deformation rate epsilon 1 and a deformation epsilon 2; s3, performing thermal compression experiments: performing multiple groups of thermal compression experiments on the sample on a thermal simulation experiment machine according to the parameter combination; s4, structure analysis: analyzing the metallographic structure of the test sample after the experiment, and determining process parameters corresponding to the test sample which is completely recrystallized and has refined grains; and S5, window determination: based on an analysis result of S4, determining an optimal process parameter window for enabling the steel pipe to be subjected to complete recrystallization and grain refinement. The invention further discloses a diameter expanding method. The purpose of the invention is to realize accurate control of the expanding process by combining a thermal simulation experiment with industrial production.

The invention discloses a manufacturing method of a mushroom head forge piece of a miter gate bottom pivot of a ship lock of a large hydropower station, and relates to the technical field of heat treatment methods, and the manufacturing method comprises the following steps: S1, smelting: smelting the mushroom head forge piece by adopting an electric furnace, external refining and vacuum degassing smelting; s2, forging is conducted, specifically, the initial forging temperature is 1200 DEG C, and the final forging temperature is 850 DEG C; forging deformation: drawing out, chopping a riser and a water port, upsetting, drawing out, upsetting, drawing out, upsetting and forging a mushroom head by a die, and shaping; s3, heat treatment after forging is conducted, refined grains are annealed at 680 DEG C, and tempering is conducted at 600-620 DEG C; s4, rough machining; s5, performance heat treatment is conducted, specifically, quenching is conducted at 1020 DEG C, and tempering is conducted at 520-540 DEG C; and S6, machining is carried out, after sampling detection is completed after heat treatment, one-time rough turning is carried out on the spherical end and the large-plane end, hoisting bolt holes are machined, and finish turning is carried out. The manufactured mushroom head forge piece meets the requirements of high working strength, corrosion resistance and wear resistance of the bottom of the ship lock.

The invention discloses a method for predicting the performance of a formed part of an additive manufacturing and rolling composite process, and belongs to the field of material performance characterization and prediction.The method comprises the steps that thermal response of a metal part to moving laser is simulated through modeling by means of a finite element method, and real-time temperature field data are obtained; establishing a temperature-dependent phase field model, and importing the additive parameters and the temperature field data output by the finite element method into the temperature-dependent phase field model to output microstructure data; establishing a rolling grain growth recrystallization model coupled with crystal plasticity and a phase field method by using the microstructure data; the grain size after recrystallization refining is output according to a grain growth recrystallization model of a phase field method; and predicting the performance of the formed part according to the grain size after recrystallization and refinement. According to the method, efficient prediction of the performance of the formed part is realized through accurate simulation of the grain size.

The invention discloses a hundred-bone refined grain meal and a preparation method thereof. The nutritional powder is prepared from the following raw materials in parts by weight: 4.70 to 4.75 parts of maltodextrin, 12.5 to 12.8 parts of soybean protein isolate, 9.2 to 9.4 parts of soybean meal, 9 to 9.2 parts of maltitol, 9 to 9.2 parts of black bean meal, 9.5 to 10.5 parts of resistant dextrin, 5 to 5.2 parts of rice meal, 3.9 to 4.1 parts of black rice, 2.9 to 3.1 parts of coix seeds, 2.20 to 2.24 parts of oat, 2 to 2.2 parts of oat bran, 2 to 2.2 parts of konjak, 1.9 to 2.1 parts of red beans, 1.9 to 2.1 parts of round-packed semen plantaginis husks and 4.9 to 5.1 parts of 196 mixed materials, the nutritional powder is prepared from the following raw materials in parts by weight: 1.9 to 2.1 parts of white kidney bean powder, 4.9 to 5.1 parts of sedum aizoon, 1.6 to 1.8 parts of red dates, 4.9 to 5.1 parts of whey protein, 2.4 to 2.6 parts of milk basic protein, 0.49 to 0.51 part of compound fermented fruit and vegetable powder, 0.05 to 0.15 part of phaseolus calcaratus, 0.05 to 0.15 part of poria cocos, 0.05 to 0.15 part of selenium-enriched malt flour, 0.05 to 0.15 part of soybean peptide type II, 0.005 to 0.015 part of a guarana extract and a turmeric extract. The invention can reduce the body weight of people and supplement protein, and has the effects of low calorie, high protein, physique improvement, chronic disease conditioning and the like.

This invention relates to the field of high-strength cold-rolled steel sheet preparation technology, and particularly to a cold-rolled 780 grade DH steel with refined grains and uniform microstructure, and its production method. The chemical composition of the steel, by weight percentage, is: C: 0.08%–0.12%, Si: 0.4%–0.6%, Mn: 1.6%–2.0%, Nb: 0.02%–0.04%, P≤0.012%, S≤0.005%, Ti: 0.01%–0.02%, Als: 0.025%–0.050%, N≤0.0035%, with the balance being Fe and unavoidable impurities. The ferrite grain size in the steel of this invention is 5–8 μm, with a grain size standard deviation ≤1.2 μm, solving the problem of uneven microstructure. The finished steel has a tensile strength ≥780 MPa, elongation after fracture ≥22%, and earing rate ≤1.5%, meeting the requirements of complex deep drawing.