CN114528670B - Method for detecting tensile strength of casting - Google Patents

Method for detecting tensile strength of casting Download PDF

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CN114528670B
CN114528670B CN202210421593.3A CN202210421593A CN114528670B CN 114528670 B CN114528670 B CN 114528670B CN 202210421593 A CN202210421593 A CN 202210421593A CN 114528670 B CN114528670 B CN 114528670B
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姜爱龙
李继超
孙玉成
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Weichai Power Co Ltd
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Abstract

The invention belongs to the technical field of casting processes, and particularly relates to a method for detecting tensile strength of a casting, which comprises the following steps: acquiring the solid tensile strength of a solid casting; establishing a simulated casting mold according to the solid casting and the solid casting mold thereof; performing simulated filling on the simulated casting mold; calculating a simulated eutectoid cooling speed and a simulated eutectic cooling speed of the simulated casting; establishing a prediction model for simulating a eutectoid cooling speed, a simulated eutectic cooling speed and an entity tensile strength; and calculating the solid tensile strength of the solid casting at different positions according to the simulated cooling speed of the simulated casting at different positions. The method comprises the steps of firstly obtaining the solid tensile strength of the solid casting, then calculating the simulated eutectoid cooling speed and the simulated eutectic cooling speed of the simulated casting according to the simulated casting, establishing a prediction model of the solid tensile strength, the simulated eutectoid cooling speed and the simulated eutectic cooling speed, and obtaining the tensile strength of the corresponding position of the solid casting through the prediction model.

Description

Method for detecting tensile strength of casting
Technical Field
The invention belongs to the technical field of casting processes, and particularly relates to a method for detecting tensile strength of a casting.
Background
The material performance is an important factor influencing the reliability of the casting, the tensile strength of the casting is generally detected by adopting a single-casting test bar method due to the irregular shape of the casting, a single-casting sample is designed and manufactured according to the national standard, the corresponding relation between the single-casting sample and bodies with different structures is difficult to establish, and the difference between the pouring time and the pouring state of the single-casting sample and the casting is large. In order to improve the accuracy of detecting the tensile strength, a body sampling detection method is adopted for detection, and the body sampling detection is to separate a part of samples from a casting body, so that the cost is high, the local performance of the casting can be only reflected, and the performance of the part of the casting which is not detected is difficult to reflect.
Disclosure of Invention
The invention aims to at least solve the problem that the performance of each part of the casting is difficult to detect by the existing method for detecting the tensile strength of the casting. The purpose is realized by the following technical scheme:
the invention provides a method for detecting the tensile strength of a casting, which comprises the following steps:
acquiring the solid tensile strength of a solid casting;
establishing a simulated casting mold according to the solid casting and the solid casting mold thereof;
carrying out simulated mold filling on the simulated mold;
calculating a simulated eutectoid cooling speed and a simulated eutectic cooling speed of the simulated casting;
establishing a prediction model for simulating a eutectoid cooling speed, a simulated eutectic cooling speed and an entity tensile strength;
and calculating the entity tensile strength of the entity casting at different positions according to the simulated eutectoid cooling speed and the simulated eutectic cooling speed of the simulated casting at different positions.
According to the method for detecting the tensile strength of the casting, the solid tensile strength of the solid casting is obtained, the simulation casting mold is built according to the solid casting and the solid casting mold forming the solid casting, the simulation casting is obtained after the simulation mold is filled, the simulation eutectoid cooling speed and the simulation eutectic cooling speed of the simulation casting are calculated according to the formed simulation casting, a prediction model of the solid tensile strength, the simulation eutectoid cooling speed and the simulation eutectic cooling speed is built, the simulation eutectoid cooling speed and the simulation eutectic cooling speed of any position of the simulation casting are respectively brought into the prediction model, and the tensile strength of the corresponding position of the solid casting can be obtained.
In addition, the method for detecting the tensile strength of the casting according to the embodiment of the invention can also have the following technical characteristics:
in some embodiments of the present invention, the step of establishing a prediction model for simulating a eutectoid cooling rate, a simulated eutectic cooling rate, and a tensile strength of the entity further includes the following steps:
acquiring an actual measurement eutectoid cooling speed and an actual measurement eutectic cooling speed of the solid casting;
and establishing a solid model simulating the eutectoid cooling speed, the eutectic cooling speed and the tensile strength of the solid according to the actually measured eutectoid cooling speed and the actually measured eutectic cooling speed of the solid casting.
In some embodiments of the present invention, the step of establishing a physical model simulating a eutectoid cooling rate, a simulated eutectic cooling rate, and a physical tensile strength according to the measured eutectoid cooling rate and the measured eutectic cooling rate of the physical casting specifically includes the following steps:
establishing an entity model of an actually measured eutectoid cooling speed, an actually measured eutectic cooling speed and an entity tensile strength of an entity casting:
Figure 990519DEST_PATH_IMAGE001
（1）
wherein the content of the first and second substances,
Figure 3475DEST_PATH_IMAGE002
for the purpose of the tensile strength,
Figure 620401DEST_PATH_IMAGE003
actually measuring the cooling speed of the casting at the eutectic stage at the temperature/s;
Figure 769623DEST_PATH_IMAGE004
measuring the cooling speed of the eutectoid stage of the casting in real time at the temperature/s;
calculating a cooling rate correction factor according to the actually measured eutectoid cooling rate, the actually measured eutectic cooling rate, the simulated eutectoid cooling rate and the simulated eutectic cooling rate:
Figure 446591DEST_PATH_IMAGE005
（2）
Figure 884526DEST_PATH_IMAGE006
（3）
wherein the content of the first and second substances,
Figure 101881DEST_PATH_IMAGE007
in order to simulate the cooling speed of the casting at the eutectic stage, the temperature is measured in degrees centigrade per second;
Figure 308871DEST_PATH_IMAGE008
in order to simulate the cooling speed of the eutectoid stage of the casting, the temperature/s,
Figure 156741DEST_PATH_IMAGE009
is a correction factor for the rate of eutectic cooling,
Figure 380175DEST_PATH_IMAGE010
a correction factor for the eutectoid cooling rate;
substituting the equations (2) and (3) into the equation (1) to obtain a cooling rate correction factor, a simulated cooling rate and a solid tensile strength, and establishing a prediction model of the simulated cooling rate and the solid tensile strength:
Figure 338903DEST_PATH_IMAGE011
（4）。
in some embodiments of the present invention, before the step of obtaining the measured eutectoid cooling rate and the measured eutectic cooling rate of the solid casting, the method further includes the following steps:
a plurality of solid thermocouples are disposed at a plurality of different locations of a solid mold.
In some embodiments of the invention, before calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate for the simulated casting, the method further comprises the steps of:
and arranging a plurality of virtual thermocouples at a plurality of different positions of the simulated casting mold, wherein the positions of the virtual thermocouples in the simulated casting mold correspond to the positions of the solid thermocouples in the solid casting mold in a one-to-one mode.
In some embodiments of the present invention, the step of calculating the simulated eutectoid cooling rate and the simulated eutectic cooling rate of the simulated casting specifically includes the following steps:
acquiring the data of the simulated cooling speed in a segmented manner according to the solid phase rate of the simulated casting;
and calculating the simulated eutectic cooling speed and the simulated eutectic cooling speed of the simulated casting according to the acquired data of the simulated cooling speed.
In some embodiments of the present invention, the step of obtaining the data of the cooling rate according to the solid fraction of the simulated casting includes the following steps:
when the solid phase rate of the simulated casting is 0-1%, acquiring primary cooling speed data at an interval of 0.2%;
when the solid phase rate of the simulated casting is 1% -2%, acquiring primary cooling speed data at an interval of 0.25%;
when the solid phase rate of the simulated casting is 2% -3%, acquiring primary cooling speed data at an interval of 0.5%;
when the solid fraction of the simulated casting is greater than 3%, primary cooling rate data is acquired at intervals of 1%.
In some embodiments of the present invention, the step of calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate of the simulated casting according to the obtained data of the simulated cooling rate specifically comprises the steps of:
fitting a cooling curve of the simulated casting according to the obtained data of the simulated cooling speed;
and calculating the simulated eutectic cooling rate and the simulated eutectoid cooling rate of the simulated casting according to the simulated cooling curve of the casting.
In some embodiments of the present invention, before the step of obtaining the solid tensile strength of the solid casting, the method further comprises the following steps:
carrying out structural analysis on a casting to be cast to construct an entity casting mold;
and pouring the solid casting mold to obtain a solid casting.
In some embodiments of the present invention, the step of establishing a simulated mold according to the solid casting and the solid mold thereof specifically includes the following steps:
establishing a simulation casting finite element analysis model according to the structures of the solid casting and the solid casting;
and setting the material, the pouring temperature and the boundary conditions of the casting according to the material, the pouring temperature and the boundary conditions of the section of the solid casting.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a schematic flow chart of a method for detecting the tensile strength of a casting according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating the steps of the method for detecting the tensile strength of the casting according to the embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, structures, regions, layers and/or structural sections, these elements, structures, regions, layers and/or structural sections should not be limited by these terms. These terms may be only used to distinguish one element, structure, region, layer or section from a second region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, structure, region, layer or section discussed below could be termed a second element, structure, region, or section without departing from the teachings of the example embodiments.
For convenience in description, spatially relative terms, such as "inner", "outer", "lower", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to a second element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in fig. 1 and 2, the present invention provides a method for detecting tensile strength of a casting, comprising the steps of:
s10: acquiring the solid tensile strength of the solid casting;
s20: establishing a simulated casting mold according to the solid casting and the solid casting mold thereof;
s30: carrying out simulated mold filling on the simulated mold;
s40: calculating a simulated eutectoid cooling speed and a simulated eutectic cooling speed of the simulated casting;
s50: establishing a prediction model for simulating a eutectoid cooling speed, a simulated eutectic cooling speed and an entity tensile strength;
s60: and calculating the entity tensile strength of the entity casting at different positions according to the simulated eutectoid cooling speed and the simulated eutectic cooling speed of the simulated casting at different positions.
According to the method for detecting the tensile strength of the casting, the solid tensile strength of the solid casting is obtained, the simulation casting mold is built according to the solid casting and the solid casting mold forming the solid casting, the simulation casting is obtained after the simulation mold is filled, the simulation eutectoid cooling speed and the simulation eutectic cooling speed of the simulation casting are calculated according to the formed simulation casting, a prediction model of the solid tensile strength, the simulation eutectoid cooling speed and the simulation eutectic cooling speed is built, the simulation eutectoid cooling speed and the simulation eutectic cooling speed of any position of the simulation casting are respectively brought into the prediction model, and the tensile strength of the corresponding position of the solid casting can be obtained.
In some embodiments of the present invention, the step of establishing a prediction model for simulating a eutectoid cooling rate, a simulated eutectic cooling rate, and a tensile strength of the entity further includes the following steps:
acquiring an actual measurement eutectoid cooling speed and an actual measurement eutectic cooling speed of the solid casting;
and establishing a solid model for simulating a eutectoid cooling speed, a eutectic cooling speed and the tensile strength of the solid according to the actually measured eutectoid cooling speed and the actually measured eutectic cooling speed of the solid casting.
The method comprises the steps of carrying out regression analysis according to the actual measurement eutectoid cooling speed and the actual measurement eutectic cooling speed of the entity casting at multiple positions and the tensile strength of an entity respectively to obtain the correlation between the actual measurement eutectoid cooling speed and the actual measurement eutectic cooling speed of the entity casting and the tensile strength of the entity casting, wherein a certain proportional relation exists between the simulation cooling speed (the simulation eutectoid cooling speed and the simulation eutectic cooling speed) of the simulation casting and the actual measurement eutectoid cooling speed and the actual measurement eutectic cooling speed of the entity casting, and therefore a prediction model between the simulation cooling speed of the simulation casting and the tensile strength of the entity casting can be established through the actual measurement eutectoid cooling speed and the actual measurement eutectic cooling speed of the entity casting.
Specifically, the step of establishing a physical model simulating a eutectoid cooling rate, a eutectic cooling rate and a tensile strength of a solid according to the measured eutectoid cooling rate and the measured eutectic cooling rate of the solid casting specifically comprises the following steps:
and establishing a physical model of the actually measured eutectoid cooling speed, the actually measured eutectic cooling speed and the physical tensile strength of the physical casting.
The actual measurement eutectoid cooling speed of the solid casting, the actual measurement eutectoid cooling speed of the solid casting and the tensile strength of the solid can be obtained according to actual measurement, and specifically, the actual measurement eutectoid cooling speed and the actual measurement eutectoid cooling speed of the solid casting can be measured in the casting cooling process through a thermocouple arranged in the solid casting. The tensile strength of the solid casting requires that a portion of the casting where the thermocouple is disposed (or a portion in the vicinity thereof) be separated from the integral casting, and the solid tensile strength of the portion is measured by a tensile test.
And performing regression analysis jointly according to the measured data of the measured eutectoid cooling speed, the measured eutectic cooling speed and the measured physical tensile strength of the first position of the physical casting, the measured eutectoid cooling speed, the measured eutectic cooling speed and the measured physical tensile strength of the second position of the physical casting, the measured eutectoid cooling speed, the measured physical tensile strength of the third position of the physical casting, and the measured eutectoid cooling speed, the measured eutectic cooling speed and the measured physical tensile strength of the Nth (N is more than or equal to 3) position of the physical casting, so as to establish a physical model of the measured eutectoid cooling speed, the measured eutectic cooling speed and the measured physical tensile strength of the physical casting. The method comprises the steps of analyzing according to data of actually measured eutectoid cooling speed, actually measured eutectic cooling speed and entity tensile strength of a plurality of positions of an entity casting to obtain a relational expression (formula 1) among the entity tensile strength of the entity casting, the actually measured eutectoid cooling speed of the entity casting and the actually measured eutectic cooling speed of the entity casting.
Figure 462717DEST_PATH_IMAGE012
（1）
Wherein the content of the first and second substances,
Figure 481489DEST_PATH_IMAGE013
the tensile strength is a value in terms of MPa,
Figure 690753DEST_PATH_IMAGE014
the measured cooling speed of the casting at the eutectic stage is the temperature/s which is more than or equal to 0.228 ℃/s
Figure 453173DEST_PATH_IMAGE014
≤8.905℃/s；
Figure 369176DEST_PATH_IMAGE015
The cooling speed of the eutectoid stage of the casting is actually measured, wherein the cooling speed is at DEG C/s and is more than or equal to 0.014℃/s
Figure 621166DEST_PATH_IMAGE016
≤0.274℃/s。
The relation among the actually measured eutectic cooling rate and the actually measured eutectoid cooling rate of the solid casting and the tensile strength of the solid casting can be obtained according to the formula 1, the correction factor between the actually measured eutectoid cooling rate of the solid casting and the simulated eutectoid cooling rate of the simulated casting is obtained, and the correction factor between the actually measured eutectic cooling rate and the simulated eutectic cooling rate of the solid casting is obtained according to the formulas (2) and (3).
Figure 255410DEST_PATH_IMAGE017
（2）
Figure 821520DEST_PATH_IMAGE018
（3）
Wherein the content of the first and second substances,
Figure 654347DEST_PATH_IMAGE019
to simulate the cooling rate of the casting at the eutectic stageDegree, DEG C/s;
Figure 14921DEST_PATH_IMAGE020
in order to simulate the cooling speed of the eutectoid stage of the casting, the temperature/s,
Figure 402040DEST_PATH_IMAGE021
is a correction factor for the eutectic cooling rate,
Figure 303000DEST_PATH_IMAGE022
is a correction factor for the eutectoid cooling rate.
Figure 459175DEST_PATH_IMAGE023
（5）
Figure 787388DEST_PATH_IMAGE024
（6）
The formula (5) and the formula (6) are respectively substituted into the formula (1) to obtain the formula (4).
Figure 396224DEST_PATH_IMAGE025
（4）。
According to the formula (4), the simulated eutectic cooling speed of any position of the simulated casting and the tensile strength of the solid casting corresponding to the simulated eutectic cooling speed can be calculated, and the tensile strength of the solid casting can be obtained on the premise of not damaging the casting.
In some embodiments of the present invention, before the step of obtaining the measured eutectoid cooling rate and the measured eutectic cooling rate of the solid casting, the method further includes the following steps:
a plurality of solid thermocouples are disposed at a plurality of different locations of a solid mold.
In order to ensure the accuracy of data, entity thermocouples are arranged at a plurality of positions of an entity casting mold, correspondingly, the tensile strength of an entity casting is measured at the positions near the thermocouples, regression analysis is carried out through the data of the actually measured eutectoid cooling speed, the actually measured eutectic cooling speed and the entity tensile strength of each position, and finally a prediction model is established.
In some embodiments of the invention, before calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate for the simulated casting, the method further comprises the steps of:
the method comprises the steps that a plurality of virtual thermocouples are arranged at a plurality of different positions of a simulated casting mold, a plurality of virtual thermocouples are arranged at corresponding positions of the simulated casting mold according to the entity thermocouples at a plurality of positions of the entity casting mold, the number of the entity thermocouples is equal to that of the virtual thermocouples, and the positions of the virtual thermocouples in the simulated casting mold correspond to the positions of the entity thermocouples in the entity casting mold one by one, so that the accuracy of data is guaranteed.
In some embodiments of the present invention, the step of calculating the simulated eutectoid cooling rate and the simulated eutectic cooling rate of the simulated casting specifically includes the following steps:
and acquiring the data of the simulated cooling speed in a segmentation mode according to the solid fraction of the simulated casting.
In order to ensure the accuracy of the simulated eutectoid cooling speed and the simulated eutectic cooling speed of the simulated casting, the cooling speed of the simulated casting is obtained in a segmented mode according to the solid phase rate of the simulated casting, so that the cooling curve obtained through fitting is ensured to be more accurate.
Specifically, in some embodiments of the present invention, the step of obtaining the data of the cooling rate according to the solid fraction of the simulated casting includes the following steps:
when the solid phase rate of the simulated casting is between 0 and 1 percent, acquiring primary simulated casting cooling speed data at intervals of 0.2 percent of the solid phase rate;
when the solid phase rate of the simulated casting is 1-2%, acquiring primary simulated casting cooling speed data at intervals of 0.25% of the solid phase rate;
when the solid phase rate of the simulated casting is 2-3%, acquiring primary simulated casting cooling speed data at intervals of 0.5% of the solid phase rate;
when the solid phase rate of the simulated casting is more than 3%, the cooling speed data of the simulated casting is obtained at intervals of 1% of the solid phase rate.
Specifically, the cooling rate of the simulated casting is obtained by measuring a virtual thermocouple arranged in the simulated casting, or the cooling rate of a certain position point in the simulated casting is directly obtained according to specific coordinates.
In some embodiments of the present invention, after the step of obtaining the data of the simulated cooling rate in stages according to the solid fraction of the simulated casting, the simulated eutectic cooling rate and the simulated eutectoid cooling rate of the simulated casting are calculated according to the obtained data of the simulated cooling rate.
Specifically, fitting a cooling curve of the simulated casting according to the acquired data of the simulated cooling speed; and calculating the simulated eutectic cooling rate and the simulated eutectoid cooling rate of the simulated casting according to the simulated cooling curve of the casting.
And fitting to obtain a cooling curve of the casting at the thermocouple position according to the data of the simulated cooling speed obtained at a certain thermocouple position, and calculating to obtain the simulated eutectic cooling speed and the simulated eutectoid cooling speed of the thermocouple position according to the cooling curve.
In some embodiments of the present invention, before the step of obtaining the solid tensile strength of the solid casting, the method further comprises the following steps:
carrying out structural analysis on a casting to be cast to construct an entity casting mold;
and pouring the solid casting mold to obtain a solid casting.
The method comprises the steps of constructing an entity casting mold corresponding to a casting to be cast by analyzing the structure of the casting, pouring the entity casting mold to obtain an entity casting, measuring the entity tensile strength of the entity casting, and obtaining the temperature change of a thermocouple in the entity casting mold in the cooling process of the entity casting.
In some embodiments of the present invention, the step of establishing a simulated mold according to the solid casting and the solid mold thereof specifically includes the following steps:
establishing a finite element analysis model of the simulated casting according to the structures of the solid casting and the solid casting, then carrying out grid division on the finite element analysis model, and then setting the material and pouring temperature of the simulated casting and the boundary condition of the section of the casting according to the material, pouring temperature and boundary condition of the section of the solid casting so as to ensure that the simulated casting and the solid casting have the same casting material, pouring temperature, boundary condition and the like.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. The method for detecting the tensile strength of the casting is characterized by comprising the following steps of:
acquiring the solid tensile strength of a solid casting;
establishing a simulated casting mold according to the solid casting and the solid casting mold thereof;
carrying out simulated mold filling on the simulated mold;
calculating a simulated eutectoid cooling speed and a simulated eutectic cooling speed of the simulated casting;
establishing a prediction model for simulating a eutectoid cooling speed, a simulated eutectic cooling speed and an entity tensile strength;
calculating the entity tensile strength of the entity casting at different positions according to the simulated eutectoid cooling speed, the simulated eutectic cooling speed and the prediction model of the simulated casting at different positions;
the step of establishing a prediction model for simulating the eutectoid cooling speed, the eutectic cooling speed and the solid tensile strength specifically comprises the following steps of:
acquiring an actual measurement eutectoid cooling speed and an actual measurement eutectic cooling speed of the solid casting;
establishing a physical model simulating a eutectoid cooling speed, a eutectic cooling speed and physical tensile strength according to the actually measured eutectoid cooling speed and the actually measured eutectic cooling speed of the physical casting;
the step of establishing a physical model for simulating a eutectoid cooling speed, a eutectic cooling speed and a physical tensile strength according to the actual measurement eutectoid cooling speed and the actual measurement eutectic cooling speed of the physical casting specifically comprises the following steps:
establishing a solid model of the actually measured eutectoid cooling speed, the actually measured eutectic cooling speed and the solid tensile strength of the solid casting:
Figure 891088DEST_PATH_IMAGE001
（1）
wherein the content of the first and second substances,
Figure 423701DEST_PATH_IMAGE002
for the purpose of the tensile strength,
Figure 888180DEST_PATH_IMAGE003
the measured cooling speed of the casting at the eutectic stage is measured in ℃/s;
Figure 947272DEST_PATH_IMAGE004
the cooling speed of the eutectoid stage of the cast is actually measured, and the unit of the cooling speed is ℃/s;
calculating a cooling rate correction factor according to the measured eutectoid cooling rate, the measured eutectic cooling rate, the simulated eutectoid cooling rate and the simulated eutectic cooling rate:
Figure 940636DEST_PATH_IMAGE005
（2）
Figure 960544DEST_PATH_IMAGE006
（3）
wherein the content of the first and second substances,
Figure 963135DEST_PATH_IMAGE007
the cooling speed of the casting at the eutectic stage is simulated, and the unit of the cooling speed is ℃/s;
Figure 486521DEST_PATH_IMAGE008
in order to simulate the cooling rate of the casting in the eutectoid stage, the unit is ℃/s,
Figure 181944DEST_PATH_IMAGE009
is a correction factor for the rate of eutectic cooling,
Figure 564515DEST_PATH_IMAGE010
a correction factor for the eutectoid cooling rate;
substituting the formulas (2) and (3) into the formula (1) to obtain a cooling rate correction factor, a simulated cooling rate and a solid tensile strength, and establishing a prediction model of the simulated cooling rate and the solid tensile strength:
Figure 105218DEST_PATH_IMAGE011
（4）。
2. the method for testing the tensile strength of a casting according to claim 1, wherein before the step of obtaining the measured eutectic cooling rate and the measured eutectic cooling rate of the solid casting, the method further comprises the steps of:
a plurality of solid thermocouples are disposed at a plurality of different locations of a solid mold.
3. The method for testing the tensile strength of a casting according to claim 2, wherein before calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate for the simulated casting, the method further comprises the steps of:
and arranging a plurality of virtual thermocouples at a plurality of different positions of the simulated casting mold, wherein the positions of the virtual thermocouples in the simulated casting mold correspond to the positions of the solid thermocouples in the solid casting mold in a one-to-one mode.
4. The method for detecting the tensile strength of the casting according to claim 1, wherein the step of calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate of the simulated casting specifically comprises the steps of:
acquiring data of a simulated cooling speed in a segmented manner according to the solid fraction of the simulated casting;
and calculating the simulated eutectic cooling speed and the simulated eutectic cooling speed of the simulated casting according to the acquired data of the simulated cooling speed.
5. The method for detecting the tensile strength of the casting according to claim 4, wherein the step of acquiring the cooling speed data according to the solid fraction of the simulated casting in a segmented manner specifically comprises the following steps:
when the solid phase rate of the simulated casting is 0-1%, acquiring primary cooling speed data at intervals of 0.2% of the solid phase rate;
when the solid phase rate of the simulated casting is 1% -2%, acquiring primary cooling speed data at intervals of 0.25% of the solid phase rate;
when the solid phase rate of the simulated casting is 2% -3%, acquiring primary cooling speed data at intervals of 0.5% of the solid phase rate;
when the solid phase ratio of the simulated casting was greater than 3%, the primary cooling rate data was obtained at intervals of 1% solid phase ratio.
6. The method for detecting the tensile strength of the casting according to claim 4, wherein the step of calculating the simulated eutectic cooling rate and the simulated eutectic cooling rate of the simulated casting according to the acquired data of the simulated cooling rate specifically comprises the following steps:
fitting a cooling curve of the simulated casting according to the obtained data of the simulated cooling speed;
and calculating the simulated eutectic cooling speed and the simulated eutectic cooling speed of the simulated casting according to the cooling curve of the simulated casting.
7. The method for testing the tensile strength of a casting according to claim 1, wherein before the step of obtaining the solid tensile strength of the solid casting, the method further comprises the following steps:
carrying out structural analysis on a casting to be cast to construct an entity casting mold;
and pouring the solid casting mold to obtain a solid casting.
8. The method for detecting the tensile strength of the casting according to claim 1, wherein the step of establishing the simulated mold according to the solid casting and the solid mold thereof specifically comprises the following steps:
establishing a simulation casting finite element analysis model according to the structures of the solid casting and the solid casting;
and setting the material, the pouring temperature and the boundary conditions of the casting according to the material, the pouring temperature and the boundary conditions of the section of the solid casting.
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JP2018062006A (en) * 2016-10-07 2018-04-19 日立金属株式会社 Method of estimating hardness of casting of nodular graphite cast iron
CN109338229A (en) * 2018-12-03 2019-02-15 东北大学 Based on quenching-carbon distribution theory low-carbon Si-Mn system hot rolling Multiphase Steel and manufacturing method
CN113823359A (en) * 2021-09-18 2021-12-21 南京工业大学 Method for optimizing casting cooling process parameters of aluminum alloy steering gear valve shell

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102254057A (en) * 2011-04-25 2011-11-23 天津职业技术师范大学 Method for predicting rolling off-line mechanical property of thin plate
CN103136415A (en) * 2011-11-21 2013-06-05 西门子公司 Method for optimizing casting having nonuniform texture
CN102649993A (en) * 2012-04-25 2012-08-29 中国科学院金属研究所 Method for thinning crystalline grain of large low alloy cast
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