11 results about "Structure property" patented technology

The invention discloses modified 34CrMo4 steel with Nb replacing Ti and a preparation method of the modified 34CrMo4 steel. The modified 34CrMo4 steel is prepared from, by mass, 0.32%-0.36% of C, 0.60%-0.80% of Mn, 0.15%-0.30% of Si, 0.12%-0.20% of Ni, 0.90%-1.20% of Cr, 0.20%-0.30% of Mo, 0.02%-0.04% of Al, smaller than or equal to 80 ppm of Ti, smaller than or equal to 0.012% of P + S, 100-300 ppm of Nb and the balance Fe and inevitable impurity elements. The structure property of the material can be obviously optimized, the structure and carbide of the obtained 34CrMo4 steel for the gas cylinder are refined, the average fatigue life is larger than 16000 times in a 45 MPa water pressure cyclic fatigue test, and meanwhile the 34CrMo4 steel for the gas cylinder has the advantages of being excellent in room-temperature tensile property and good in fatigue resistance.

The invention relates to a GH4706 alloy long-time thermal exposure structure performance evaluation method, belongs to the technical field of high-temperature alloy performance evaluation, and solves the problem that an existing method is incomprehensive in alloy performance evaluation. The method comprises the following steps: selecting an alloy forge piece to carry out a long-term thermal exposure test, obtaining structure property data and / or structure parameters of the alloy forge piece at different temperatures and different thermal exposure time, and forming an actual measurement data set; determining a relationship p = T (lgt + C) / 1000 between the time-temperature unified parameter and the thermal exposure time and thermal exposure temperature, substituting experimental data and different C values into a formula, and calculating p; establishing a preliminary fitting model between the p and the structure performance data and / or the structure parameters through linear fitting; determining an optimal C value; establishing a final fitting model between the p and the structure performance data and / or the structure parameters; and verifying the equivalence of the model by using a p value, and evaluating the performance by using a final fitting model. The method can comprehensively evaluate the performance of the alloy.

The invention provides a friction stir deposition repairing method for magnesium alloy surface defects. Comprising the following steps: step 1, checking and cleaning a defective component; 2, a to-be-repaired area is machined, and a filling material is prepared; 3, the to-be-repaired part is installed and clamped, and repairing is conducted; 4, waste materials are cleaned, and next-layer deposition repair is conducted; 5, the repairing quality and performance are inspected; and 6, after repairing is completed, surface treatment and coating are conducted on the part. Based on the solid-phase characteristics of the magnesium alloy, the AFSD technology is used for repairing the surface defects of the magnesium alloy, and the defects such as cracks and air holes are avoided; according to the AFSD repairing method, under the condition that the structure property of the feeding material is not changed, the influence on the base material can be effectively avoided, and compared with other repairing methods, the residual stress and the thermal deformation degree after AFSD repairing are low.

The invention belongs to the technical field of welding. According to the aluminum alloy thick plate welding joint structure property non-uniformity evaluation method and system, a layering critical judgment coefficient is set according to the plate thickness and grain size distribution rule, and division of a thick plate base metal non-uniformity evaluation area is achieved; the division of the non-uniformity evaluation area of the welding joint is realized by combining the division of a base metal evaluation area and the boundary of a welding joint welding seam area, a heat affected area and a base metal area; the microstructures of different evaluation area layers are subjected to characterization analysis, the non-uniformity coefficient of the characteristic values of the microstructures is calculated, and evaluation of the non-uniformity of the microstructures is achieved; the micro-area mechanical properties of different evaluation area layers are tested, the non-uniformity coefficient of the micro-area mechanical properties is calculated, and the non-uniformity evaluation of the micro-area mechanical properties is realized; and according to the non-uniformity evaluation result of the base metal and the welding joint, quantitative evaluation of the non-uniformity degree of the welding joint of the aluminum alloy thick plate is realized.

The invention provides a method and device for predicting structure property parameters of a rolled bar. The corresponding method comprises the steps that the cooling rate of the rolled bar is obtained; wherein the diameter of the rolled bar is smaller than a preset value; and predicting structure property parameters of the rolled bar according to the cooling rate and the continuous cooling transformation model of the corresponding material of the rolled bar. Compared with an existing method for predicting the structure property parameters of the rolled bar, the method has the advantages that the actually measured curve is matched with the temperature transformation curve of the material, the structure transformation result of the bar is calculated, an accurate temperature calculation curve and a phase change model are not needed in the calculation process, and the obtained result can better reflect the actual situation of the site and is more accurate and practical.

The invention discloses a method for realizing accurate control of structure evolution of high-strength steel based on controllable cooling, relates to the technical field of structure evolution regulation and phase change regulation of metal materials, and aims to solve the problems of narrow process window, easiness in cracking, non-uniform structure property and the like of a traditional quenching process of 22MnB5 steel. Continuous in-situ observation from melt solidification to phase change ending is achieved for the first time, and the regulation and control rule of the cooling rate on the structure type is defined by combining microstructure correlation analysis at different cooling rates of 1-30 DEG C / s; meanwhile, the starting and ending temperature and time of delta-gamma, gamma-alpha or martensite phase transformation are accurately determined by combining DSC thermal analysis with microscopic image contrast, and the error caused by the fact that a traditional CCT curve depends on experience derivation is overcome; according to the technology, the structure stability and performance reliability of the 22MnB5 steel are improved, and the technology can be popularized to high-strength steel systems with the liquid-solid-solid transformation characteristic such as hot forming steel and die steel.

The invention provides a vibration constraint composite shape righting device and method for a metal shell, belongs to the technical field of part machining, and solves the problem that shape righting operation cannot be performed on the metal shell under the condition that the quality of the metal shell is guaranteed in the prior art. The mold comprises a male mold and a female mold, containing grooves used for containing metal shells are formed in the male mold and the female mold, wear-resistant coatings are arranged on the inner walls of the containing grooves, connecting plates are arranged on the outer walls of the male mold and the female mold, and anti-loosening screw assemblies movably penetrate through the connecting plates. The surface of the metal shell does not need to be directly mechanically touched in the vibration shape correction process, surface damage caused by external force scraping, extrusion and the like is avoided, and the surface quality and integrity of the shell can be kept easily. And meanwhile, the structure property change of the metal material cannot be caused, and it is ensured that the mechanical property of the shell after shape correction is not affected.

According to one embodiment, a design support system reads an activity diagram and a block structure diagram. The design support system identifies a first process property and a first structure property specified as a common property of one or more process properties and structure properties. If the first process property is modified, the design support system extracts the first structure property and extracts a first block component containing the first structure property in the block structure diagram. If the first structure property is modified, the design support system extracts a first process property in the activity diagram and extracts a first process component containing the first process property in the activity diagram.

The invention provides application of a stepped controlled forging process to improvement of the structure property uniformity of niobium microalloying medium-carbon ultrahigh-strength steel. The step controlled forging process comprises a forging process in which the forging temperature and / or the forging deformation rate of three stages are sequentially reduced. The structure property uniformity of the niobium microalloying medium-carbon ultrahigh-strength steel is improved on the basis of a stepped controlled forging process, the invention further provides a corresponding forging method, and the forging method comprises the steps of high-temperature homogenization, high-temperature rough forging, medium-temperature precision forging, low-temperature finish forging and a heat treatment process. Through the stepped controlled forging technology, the niobium microalloying characteristic is combined, deformation parameters are regulated and controlled in stages, the synergistic effect of grain refinement, precipitated phase dispersion distribution and dislocation strengthening is achieved, and the bottleneck of the prior art is broken through. The ultrahigh-strength steel with the transverse tensile strength being 1.9 GPa and the transverse U-shaped notch impact energy being larger than or equal to 40 J can be prepared through the method, and low cost and transverse toughness are achieved.

The application discloses a laser glass component screening method and a laser glass manufacturing method, and the component screening method comprises the following steps: dividing a glass forming range based on consistent melting compounds, and obtaining physical properties and spectral data of a plurality of components in the glass forming range; obtaining structural characteristic description operators of the components based on molecular dynamics simulation; constructing a training data set based on the structural characteristic description operators, the physical properties and the spectral data; constructing a component-structure-property model of the glass, training the model based on the training data set, obtaining the trained component-structure-property model of the glass, and predicting corresponding physical properties and spectral data of the glass components based on the trained component-structure-property model of the glass, according to the glass components or the structural characteristic description operators as input variables. The application can efficiently and accurately screen the laser glass components.

The invention relates to a construction method of a GH4706 alloy long-time thermal exposure structure performance evaluation model, belongs to the technical field of high-temperature alloy performance evaluation, and solves the problems that an existing model is incomplete in alloy performance evaluation, long in period and high in cost. The method comprises the following steps: selecting an alloy forge piece to carry out a long-term thermal exposure test, obtaining structure property data and / or structure parameters of the alloy forge piece at different temperatures and different thermal exposure time, and forming an actual measurement data set; determining a relation k = T (lgt + C) / 1000 between the time-temperature unified parameter and the thermal exposure time and thermal exposure temperature, substituting experimental data and different C values into a formula, and calculating k; establishing a preliminary fitting model between the k and the structure performance data and / or the structure parameters through linear fitting; determining an optimal C value; and based on the optimal C value and the preliminary fitting model, establishing a final fitting model between k and the structure performance data and / or the structure parameters. The method can comprehensively evaluate the performance of the alloy.