CN-117761276-B - High-flux test system for representing casting process performance of high-temperature titanium-based alloy and preparation method thereof

Abstract

The invention provides a high-flux test system for representing casting process performance of high-temperature titanium-based alloy and a preparation method thereof, wherein the system comprises a pouring cup, a trapezoid compensating port and a sprue; the bottom end of the sprue is also provided with a sprue nest, a single spiral line alloy fluidity sample is arranged outside the sprue nest, an alloy filling capacity sample, an alloy casting shrinkage cavity/shrinkage porosity defect test sample and a mechanical property test sample are arranged between the bottom cross runner and the top cross runner, and an alloy cracking tendency test sample is fixedly connected to the middle section of the sprue. The high-flux test system for representing the casting process performance of the high-temperature titanium-based alloy has the advantages of high wax pattern manufacturing precision, flexible and convenient combination of functional module units, capability of saving the traditional pressing tool and corresponding cost, simple process flow operation, low cost and capability of greatly shortening sample preparation and research and development time.

Inventors

• KOU HONGCHAO
• JIAO HAIFENG
• WU PENGHUI
• WANG GUODONG

Assignees

• 西北工业大学

Dates

Publication Date

20260508

Application Date

20240104

Claims (5)

1. 1. The high-flux test system for representing the casting process performance of the high-temperature titanium-based alloy is characterized by comprising a pouring cup (1), a trapezoid compensating port (2) and a straight pouring gate (3), wherein the pouring cup (1), the trapezoid compensating port (2) and the straight pouring gate (3) are fixedly connected in sequence; The bottom end of the straight pouring gate (3) is also provided with a straight pouring gate nest, and a single spiral line alloy fluidity sample (7) is arranged outside the straight pouring gate nest; The device is characterized in that a cross-shaped bottom cross runner (4) is fixedly connected to the position, close to the bottom end, of the straight runner (3), a cross-shaped top cross runner (5) is fixedly connected to the position, close to the top end, of the straight runner (3), and an alloy filling capacity sample (8), an alloy casting shrinkage cavity/shrinkage cavity defect test sample (9) and a mechanical property test sample (11) are arranged between the bottom cross runner (4) and the top cross runner (5); an alloy cracking tendency test sample (10) is fixedly connected to the middle section of the sprue (3); The alloy filling type test device comprises an alloy filling type capability test sample (8) and an alloy casting shrinkage cavity/shrinkage cavity defect test sample (9), wherein the top ends of the alloy filling type capability test sample (8) and the alloy casting shrinkage cavity/shrinkage cavity defect test sample (9) are respectively connected with a top cross runner (4) through titanium wires (6), the bottom ends of the alloy casting shrinkage cavity/shrinkage cavity defect test sample (9) and the bottom cross runner (4), the top ends and the bottom ends of the mechanical property test sample (11) are respectively connected with the top cross runner (5) and the bottom cross runner (4), the alloy filling type capability test sample (8) are symmetrically distributed on two sides of a straight runner (3), the alloy casting shrinkage cavity/shrinkage cavity defect test sample (9) on each side is symmetrically distributed on two sides of the straight runner (3), the alloy casting shrinkage cavity/shrinkage cavity defect test sample (9) on each side is formed by thin plate-shaped test samples with different thicknesses in a plurality of 10-25 mm, the alloy filling type capability test sample (8) is symmetrically distributed on two sides of the straight runner (3), the alloy filling type capability test sample (8) on each side is symmetrically distributed on the largest diameter of the two sides of the straight runner (3), the largest diameter of the cylinder test sample is equal to the largest diameter and the cylinder end is equal to the largest diameter and the largest diameter is equal to the cylinder end is equal to the largest diameter and the cylinder end is equal to the largest diameter is the cylinder diameter is the largest.
2. 2. The high-throughput test system for characterizing high-temperature titanium-based alloy casting process performance according to claim 1, wherein the single-helix alloy fluidity test sample (7) is of a single-helix structure, and gauge length position points are arranged on the single-helix alloy fluidity test sample (7).
3. 3. The high throughput test system of claim 2, wherein said sprue nest is of hemispherical configuration.
4. 4. A method of preparing a high throughput test system for characterizing the casting process performance of high temperature titanium-based alloys as defined in any one of claims 1 to 3, comprising: preparing a wax pattern of the high-flux test system by a 3D printing technology, and manufacturing an investment precision casting prototype; Coating the wax mould with slurry prepared from alumina powder silica sol and alumina sand, and roasting after the slurry is solidified until the wax mould is completely melted, so as to obtain an investment casting shell; and pouring the high-temperature titanium-based alloy liquid to be characterized into the investment casting shell, and breaking the investment casting shell after cooling and solidifying to obtain the high-flux test system.
5. 5. The method for preparing a high-throughput testing system for characterizing high-temperature titanium-based alloy casting process performance of claim 4, Plate-shaped samples with different thicknesses are arranged on each pouring channel based on a bottom pouring method, so that flexible combination of sample high-flux preparation arrays is realized.

Description

High-flux test system for representing casting process performance of high-temperature titanium-based alloy and preparation method thereof Technical Field The invention belongs to the technical field of high-temperature titanium-based alloy precision casting, and particularly relates to a high-flux test system for representing casting process performance of a high-temperature titanium-based alloy and a preparation method thereof. Background Titanium and titanium alloy have been widely used in the fields of aerospace, ocean engineering, petrochemical industry, etc. because of the advantages of low density, high specific strength, high temperature resistance, corrosion resistance, etc. The service temperature of the high-temperature titanium-based alloy mainly comprising near-a-type titanium alloy and titanium-aluminum-based intermetallic compounds is above 550 ℃, and the high-temperature titanium-based alloy is an important candidate material for hot-end components of aircrafts such as aeroengines and the like, and is highly valued in all countries of the world. Casting is the most cost-effective process for forming complex cavity structures, and plays an important role in the manufacture of large complex thin-wall high-performance components. However, the casting process performance of the high-temperature titanium-based alloy is poor, and mainly characterized by poor filling fluidity, more shrinkage cavity, shrinkage porosity and porosity defects and large cracking tendency, thereby seriously affecting the process design and manufacture of the alloy castings. Conventionally, in the aspect of evaluating casting process performance, fluidity, mold filling capability, shrinkage characteristics and the like of an alloy in the casting production process are independently researched, the number of process tests is large, errors are large, cost is high, and development of an efficient and reliable characterization method is urgently needed. The prior casting discloses a high-temperature casting titanium alloy ZTA29 process performance study, wherein the fluidity of ZTA29 and ZTC4 is compared and analyzed through a concentric three-spiral model, and the fluidity of ZTA29 alloy is 64.23 percent of that of ZTC4 alloy. The method has the defect that the casting fluidity can only be evaluated, and the evaluation of the cracking tendency of the alloy is not involved. The patent 201210141407.7 discloses a visual method for casting and filling, which adopts the technical scheme that a computer is used for carrying out numerical simulation on the casting and filling process, then a high-temperature camera is used for shooting the casting and filling process, the shooting result is utilized for correcting the simulation result, and then defects of casting insufficient, cold insulation and the like are analyzed based on the corrected simulation result, so that the casting process is improved, and the casting quality is improved. However, this patent does not give specific examples, and only evaluates the parting ability of a local position of the steel alloy, and is not applicable to titanium alloys having a parting temperature of 1700 ℃. The method for researching the mold filling capability of the aluminum alloy by adopting thin-wall castings with different thicknesses is provided in the research of the vacuum suction casting mold filling capability of an aluminum alloy thin-wall part of casting, and the specific method is that a series of thin-wall castings with the thickness of 1mm, 2mm, 3mm and 4mm, the width of 30mm and the length of 200mm are designed and are connected to the same pouring gate through an inner pouring gate, and the mold filling capability of the aluminum alloy thin-wall castings under two casting conditions of low-pressure casting and vacuum suction casting is researched. The method has the defects that the method can only evaluate the filling capability of the alloy, and cannot evaluate the hot cracking tendency of the variable-section casting structure and the like. The university of great company university journal discloses an equivalent strain criterion of hot cracking prediction, which is based on the numerical simulation results of a temperature field, a stress field and a strain field in the solidification process, and provides an equivalent strain criterion of hot cracking, and the specific method is that the thermal stress and the thermal strain of a casting are analyzed to obtain the equivalent strain field distribution of the casting, and the maximum value of the equivalent strain is the hot cracking position. The method has the defects that the method can only predict the hot cracking tendency of castings, and does not relate to the evaluation of the alloy filling capability. Based on the characteristics, the high-flux test system for the casting process performance characterization of the high-temperature titanium-based alloy is provided, the characteristics of the casting process perfo