CN112760452A - Yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparation of thick and large vermicular cast iron castings - Google Patents
Yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparation of thick and large vermicular cast iron castings Download PDFInfo
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- CN112760452A CN112760452A CN202011552716.4A CN202011552716A CN112760452A CN 112760452 A CN112760452 A CN 112760452A CN 202011552716 A CN202011552716 A CN 202011552716A CN 112760452 A CN112760452 A CN 112760452A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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Abstract
The invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparing a thick and large vermicular cast iron casting; the yttrium-based heavy rare earth magnesium alloy cored wire comprises: a skin; an alloy powder coated in the sheath; the alloy powder comprises the following components: 5 to 15 weight percent of Mg; 40-60 wt% of Si; 1.2 to 2.1 weight percent of Y; 2.1 to 4.2 weight percent of La; the balance of Fe. The yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention adopts alloy powder with specific content components, is suitable for producing vermicular cast iron by a wire feeding method, reduces the vermicular fading and inoculation fading of molten iron of thick and large vermicular cast iron by proper amount of yttrium-based heavy rare earth, simultaneously lightens the segregation of magnesium element and light rare earth element, can avoid the occurrence of flake graphite when producing vermicular cast iron castings with large section thickness, long solidification time or large wall thickness difference, obtains uniformly distributed graphite tissues, and reduces the situations of large graphite, graphite distortion and carbide generation; moreover, the requirement on the content range of the base iron can be enlarged, and the width range of the adding length of the vermicular cast iron wire is increased.
Description
Technical Field
The invention relates to the technical field of vermicular cast iron manufacturing, in particular to a yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparing a thick and large vermicular cast iron casting.
Background
The vermicular graphite cast iron is gray cast iron with a transition form between flake graphite and spherical graphite, and is a novel engineering structure material characterized by good mechanical property and heat-conducting property and small section sensitivity.
The Chinese patent with publication number CN103014232A discloses a core-spun yarn for producing vermicular cast iron by a wire feeding method and a preparation method of the vermicular cast iron, wherein the vermicular cast iron is produced by combining a magnesium-silicon iron core vermicular core-spun yarn and a rare earth ferrosilicon inoculated core-spun yarn, wherein the rare earth in the inoculated yarn mainly adopts light rare earth (La and Ce). Although the technical scheme can effectively improve the stability of vermicularizing and inoculation treatment, when a thick vermicular cast iron casting is prepared, flaky graphite or graphite with sparse distribution, thick structure, carbide and the like is generated due to the fact that the casting has thick section, low cooling speed and long solidification time and is easy to generate vermicularizing recession and inoculation recession; meanwhile, when a thick and large vermicular cast iron casting is prepared, because the wall thickness is uneven, the shrinkage porosity is generally controlled by using technological measures such as chilling blocks, heating risers and the like, and because magnesium and rare earth elements have certain segregation in an iron solution and are easy to gather at local positions, the structure defects such as uneven carbide and graphite structures, thick graphite, graphite distortion and the like are caused, and the performance distribution of the casting is uneven.
Disclosure of Invention
In view of the above, the present invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn and an application thereof in preparing a thick and large vermicular cast iron casting.
The invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn, which comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Mg 5wt％～15wt％；
Si 40wt％～60wt％；
Y 1.2wt％～2.1wt％；
La 2.1wt％～4.2wt％；
the balance of Fe.
Preferably, the diameter of the yttrium-based heavy rare earth magnesium alloy core-spun yarn is 8-13 mm, the weight of the yarn is 350-550 g/m, and the core dose is 220-450 g/m.
The invention also provides a preparation method of the thick and large vermicular cast iron casting, which comprises the following steps:
a) tapping the base iron, adding alloy elements, performing vermicularizing and inoculation wire feeding treatment, and pouring to obtain a thick and large vermicular cast iron casting after slagging-off, temperature measurement and component detection in sequence;
the vermicular cored wire used in the vermicular and inoculating wire feeding process is the yttrium-based heavy rare earth magnesium alloy cored wire in the technical scheme.
Preferably, the molten base iron in step a) includes:
C 3.50wt％～3.90wt％；
Si 1.90wt％～2.3wt％；
Mn≤0.7wt％；
S 0.009wt％～0.020wt％；
P≤0.070wt％。
preferably, the tapping in the step a) is ladle tapping; the additional alloying element is selected from copper and/or tin.
Preferably, the inoculation cored wire used in the vermicularizing and inoculation feeding treatment in the step a) comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Si 55wt％～75wt％；
Ba 3wt％～10wt％；
the balance of Fe.
Preferably, the creeping and inoculating wire feeding treatment in the step a) specifically comprises the following steps:
firstly, vermicular treatment is carried out on vermicular cored wires, and then inoculation treatment is carried out on inoculated cored wires.
Preferably, the feeding length of the vermicular core-spun yarn is 20-40 m, and the feeding speed is 15-55 m/s;
the wire feeding length of the inoculated cored wire subjected to inoculation is 2-10 m, and the wire feeding speed is 13-50 m/s.
Preferably, the temperature of the vermicularizing and inoculating wire feeding treatment in the step a) is 1430-1480 ℃.
Preferably, the casting temperature in the step a) is 1320-1410 ℃ and the time is 20 s-10 min.
The invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparing a thick and large vermicular cast iron casting; the yttrium-based heavy rare earth magnesium alloy cored wire comprises: a skin; an alloy powder coated in the sheath; the alloy powder comprises the following components: 5 to 15 weight percent of Mg; 40-60 wt% of Si; 1.2 to 2.1 weight percent of Y; 2.1 to 4.2 weight percent of La; the balance of Fe. Compared with the prior art, the yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention adopts alloy powder with specific content components, is suitable for producing vermicular cast iron by a wire feeding method, reduces the vermicular fading and inoculation fading of molten iron of thick and large vermicular cast iron by proper amount of yttrium-based heavy rare earth, simultaneously reduces the segregation of magnesium element and light rare earth element, can avoid the occurrence of flake graphite when producing vermicular cast iron castings with large section thickness, long solidification time or large wall thickness difference, obtains uniformly distributed graphite tissues, and reduces the situations of large graphite, graphite distortion and carbide generation; moreover, the requirement on the content range of the base iron can be enlarged, and the width range of the adding length of the vermicular cast iron wire is increased.
In addition, cerium (Ce) is not added into the yttrium-based heavy rare earth magnesium alloy cored wire, so that the cost is properly reduced, meanwhile, titanium (Ti) and other interference elements are not contained, and the processing performance of the casting is ensured to the maximum extent.
In addition, the method adopts a wire feeding method to replace a punching method to produce the thick and large vermicular cast iron piece, the produced smoke is small, the method is environment-friendly, the magnesium has the function of self boiling, and simultaneously acts with heavy rare earth and light rare earth, the absorption rate is improved, and the production process is stable.
Drawings
FIG. 1 is a graphite phase diagram and a matrix phase diagram of a vermicular cast iron thick and big valve body obtained by a preparation method disclosed by the prior art;
FIG. 2 is a graphite phase diagram and a matrix phase diagram of a vermicular cast iron thick and large valve body obtained by the preparation method provided by the embodiment 1 of the invention;
FIG. 3 is a graphite phase diagram of a large vermicular graphite cast iron cylinder obtained by a preparation method disclosed by the prior art;
fig. 4 is a graphite phase diagram of a large vermicular graphite cast iron cylinder obtained by the preparation method provided by the embodiment 2 of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn, which comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Mg 5wt％～15wt％；
Si 40wt％～60wt％；
Y 1.2wt％～2.1wt％；
La 2.1wt％～4.2wt％；
the balance of Fe.
In the present invention, the yttrium-based heavy rare earth magnesium alloy cored wire comprises a sheath and an alloy powder coated in the sheath, and preferably consists of the sheath and the alloy powder coated in the sheath.
In the present invention, the outer skin is preferably made of steel; the present invention is not particularly limited in this regard.
In the invention, the alloy powder coated in the outer skin is vermicular alloy powder; the alloy powder comprises the following components:
Mg 5wt％～15wt％；
Si 40wt％～60wt％；
Y 1.2wt％～2.1wt％；
La 2.1wt％～4.2wt％；
the balance of Fe;
preferably:
Mg 6wt％～15wt％；
Si 50wt％；
Y 1.5wt％～2.0wt％；
La 2.5wt％～4.0wt％；
the balance of Fe.
In the invention, the vermicular graphite cast iron is prepared by adding heavy rare earth yttrium (Y) and light rare earth lanthanum (La) into the vermicular graphite alloy powder, does not add other rare earth elements such as cerium (Ce) and the like, does not contain interference elements such as titanium (Ti) and the like, and is suitable for producing vermicular graphite cast iron by a wire feeding method.
In the invention, the diameter of the yttrium-based heavy rare earth magnesium alloy core-spun yarn is preferably 8-13 mm, and more preferably 9-11 mm; the weight of the yttrium-based heavy rare earth magnesium alloy core-spun yarn is preferably 350g/m to 550g/m, and more preferably 400g/m to 500 g/m; the core dose (i.e. the dose of the vermicular alloy powder) of the yttrium-based-weight rare earth magnesium alloy cored wire is preferably 220g/m to 450g/m, and more preferably 270g/m to 400 g/m.
The preparation method of the yttrium-based heavy rare earth magnesium alloy cored wire is not particularly limited, and the technical scheme that the creep alloy powder is wrapped by a steel strip and then two sides of the creep alloy powder are bent towards the middle and compacted is adopted, which is well known by the technical personnel in the field.
The yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention adopts alloy powder with specific content components, is suitable for producing vermicular cast iron by a wire feeding method, reduces the vermicular fading and inoculation fading of molten iron of thick and large vermicular cast iron by proper amount of yttrium-based heavy rare earth, simultaneously lightens the segregation of magnesium element and light rare earth element, can avoid the occurrence of flake graphite when producing vermicular cast iron castings with large section thickness, long solidification time or large wall thickness difference, obtains uniformly distributed graphite tissues, and reduces the situations of large graphite, graphite distortion and carbide generation; moreover, the requirement on the content range of the base iron can be enlarged, and the width range of the adding length of the vermicular cast iron wire is increased.
In addition, cerium (Ce) is not added into the yttrium-based heavy rare earth magnesium alloy cored wire, so that the cost is properly reduced, meanwhile, titanium (Ti) and other interference elements are not contained, and the processing performance of the casting is ensured to the maximum extent.
The invention also provides a preparation method of the thick and large vermicular cast iron casting, which comprises the following steps:
a) tapping the base iron, adding alloy elements, performing vermicularizing and inoculation wire feeding treatment, and pouring to obtain a thick and large vermicular cast iron casting after slagging-off, temperature measurement and component detection in sequence;
the vermicular cored wire used in the vermicular and inoculating wire feeding process is the yttrium-based heavy rare earth magnesium alloy cored wire in the technical scheme.
The invention firstly carries out vermicularizing and inoculation wire feeding treatment after tapping the base iron and adding alloy elements. In the present invention, the ingredients of the base iron preferably include:
C 3.50wt％～3.90wt％；
Si 1.90wt％～2.3wt％；
Mn≤0.7wt％；
S 0.009wt％～0.020wt％；
P≤0.070wt％。
the source of the raw molten iron is not particularly limited, and the raw molten iron is obtained by adopting the technical scheme that the prepared raw materials are smelted (melted) by an electric furnace, which is well known to those skilled in the art. In a preferred embodiment of the present invention, the ingredients of the base iron include:
0 wt% -30 wt% of pig iron;
45-70 wt% of scrap steel;
0-40 wt% of returned material;
further, it is preferable to further include:
a recarburizer accounting for 2-5 wt% of the total amount of the pig iron, the scrap steel and the foundry returns; the recarburizer is preferably a graphite recarburizer, and the present invention is not particularly limited thereto.
In the invention, the tapping mode is preferably ladle tapping; the additional alloying element is preferably selected from copper and/or tin, more preferably copper and tin. In the present invention, the addition amount of the alloying element is preferably 0.5 to 1.0% by mass of Cu, 0.05 to 0.10% by mass of Sn, more preferably 0.6 to 0.9% by mass of Cu, and 0.06 to 0.09% by mass of Sn, based on the base iron.
According to the invention, a certain carburant is added before vermicularizing and inoculation feeding treatment is carried out, so that the liquidus temperature of molten iron is stabilized better.
In the invention, the vermicular cored wire used in the vermicular treatment and inoculation wire feeding process is the yttrium-based heavy rare earth magnesium alloy cored wire in the technical scheme, and is not described again; the inoculation cored wire used preferably comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Si 55wt％～75wt％；
Ba 3wt％～10wt％；
the balance of Fe.
In the present invention, the inoculation cored wire comprises, preferably consists of, a sheath and an alloy powder coated in the sheath.
In the present invention, the outer skin is preferably made of steel; the present invention is not particularly limited in this regard.
In the invention, the alloy powder coated in the outer skin is inoculation alloy powder; the alloy powder comprises the following components:
Si 55wt％～75wt％；
Ba 3wt％～10wt％；
the balance of Fe.
Preferably:
Si 65wt％；
Ba 5wt％～8wt％；
the balance of Fe.
In the invention, the inoculation alloy powder is added with heavy rare earth yttrium (Y), does not contain other rare earth elements such as cerium (Ce) and the like, does not contain interference elements such as titanium (Ti) and the like, and is suitable for producing the vermicular cast iron by a wire feeding method.
In the invention, the diameter of the inoculation cored wire is preferably 8 mm-13 mm, and more preferably 10 mm-11 mm; the weight of the inoculation cored wire is preferably 320 g/m-520 g/m, more preferably 380 g/m-480 g/m; the core dose of the inoculant cored wire (i.e. inoculant alloy powder dose) is preferably 180-340 g/m, more preferably 220-300 g/m.
The preparation method of the inoculation cored wire is not particularly limited, and the technical scheme that the inoculation alloy powder is wrapped by a steel strip and then two sides of the inoculation alloy powder are bent and compacted towards the middle is adopted, which is well known to those skilled in the art.
The inoculation cored wire provided by the invention adopts alloy powder with specific content of components, is suitable for producing vermicular cast iron by a wire feeding method, and can be better matched with the yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention when a proper amount of yttrium-based heavy rare earth is added into the inoculation cored wire.
In addition, cerium (Ce) is not added into the inoculation cored wire, so that the cost is properly reduced, meanwhile, titanium (Ti) and other interference elements are not contained, and the processing performance of the casting is ensured to the maximum extent.
In the invention, the creeping and inoculating wire feeding treatment process preferably comprises the following specific steps:
firstly, vermicular treatment is carried out on vermicular cored wires, and then inoculation treatment is carried out on inoculated cored wires.
In the invention, the feeding length of the vermicular core-spun yarn is preferably 20-40 m, more preferably 20.8-36 m; the feeding speed of the vermicular treatment is preferably 15 m/s-55 m/s, more preferably 20 m/s-50 m/s.
In the invention, the inoculation treated inoculation cored wire feeding length is preferably 2m to 10m, and more preferably 4m to 8 m; the inoculation feed line speed is preferably between 13m/s and 50m/s, more preferably between 18m/s and 45 m/s.
In the present invention, the temperature of the vermicularizing and inoculating wire feeding treatment is preferably 1430 ℃ to 1480 ℃, more preferably 1440 ℃ to 1460 ℃.
After the vermicular treatment and inoculation wire feeding treatment are finished, the method is sequentially subjected to slag skimming, temperature measurement and component detection, and then the thick and large vermicular cast iron casting is obtained through pouring. The invention has no special limitation on the specific processes of slag skimming and temperature measurement, and adopts the technical scheme familiar to the technical personnel in the field.
In the invention, the component detection mode preferably comprises on-line detection and/or pouring test block detection; the purpose is to ensure that the components of the casting meet the requirements.
In the present invention, the casting temperature is preferably 1320 to 1410 ℃, more preferably 1340 to 1390 ℃; the casting time is preferably 20 s-8 min.
The invention adopts the wire feeding method to replace the punching method to produce the thick and large vermicular cast iron parts, the produced smoke is small, the environment is friendly, the magnesium has the function of self boiling, and simultaneously acts with heavy rare earth and light rare earth, the absorptivity is improved, and the production process is stable.
The invention provides a yttrium-based heavy rare earth magnesium alloy core-spun yarn and application thereof in preparing a thick and large vermicular cast iron casting; the yttrium-based heavy rare earth magnesium alloy cored wire comprises: a skin; an alloy powder coated in the sheath; the alloy powder comprises the following components: 5 to 15 weight percent of Mg; 40-60 wt% of Si; 1.2 to 2.1 weight percent of Y; 2.1 to 4.2 weight percent of La; the balance of Fe. Compared with the prior art, the yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention adopts alloy powder with specific content components, is suitable for producing vermicular cast iron by a wire feeding method, reduces the vermicular fading and inoculation fading of molten iron of thick and large vermicular cast iron by proper amount of yttrium-based heavy rare earth, simultaneously reduces the segregation of magnesium element and light rare earth element, can avoid the occurrence of flake graphite when producing vermicular cast iron castings with large section thickness, long solidification time or large wall thickness difference, obtains uniformly distributed graphite tissues, and reduces the situations of large graphite, graphite distortion and carbide generation; moreover, the requirement on the content range of the base iron can be enlarged, and the width range of the adding length of the vermicular cast iron wire is increased.
In addition, cerium (Ce) is not added into the yttrium-based heavy rare earth magnesium alloy cored wire, so that the cost is properly reduced, meanwhile, titanium (Ti) and other interference elements are not contained, and the processing performance of the casting is ensured to the maximum extent.
In addition, the method adopts a wire feeding method to replace a punching method to produce the thick and large vermicular cast iron piece, the produced smoke is small, the method is environment-friendly, the magnesium has the function of self boiling, and simultaneously acts with heavy rare earth and light rare earth, the absorption rate is improved, and the production process is stable.
To further illustrate the present invention, the following examples are provided for illustration. The raw materials used in the following examples of the present invention are all commercially available; the used base iron is smelted by an electric furnace, and the proportion of ingredients is as follows: 20 wt% of pig iron, 50 wt% of scrap steel and 30 wt% of returned materials, and adding a graphite recarburizing agent accounting for 2.5 wt% of the total amount of the pig iron, the scrap steel and the returned materials to obtain the raw molten iron with the following components: 3.78 wt% of C, 1.92 wt% of Si, 0.60 wt% of Mn, 0.010 wt% of S and 0.050 wt% of P.
The yttrium-based heavy rare earth magnesium alloy core-spun yarn comprises a sheath and alloy powder coated in the sheath, and the preparation method comprises the following steps:
wrapping the vermicular alloy powder by a steel strip, and bending and compacting two sides to the middle to obtain yttrium-based heavy rare earth magnesium alloy cored wires; specific parameters are shown in table 1.
TABLE 1 parameter Table of Yttrium-based-weight rare earth magnesium alloy cored wire used in the examples of the present invention
The inoculation cored wire comprises a sheath and alloy powder coated in the sheath, and the preparation method comprises the following steps:
wrapping the inoculated alloy powder by a steel belt, and then bending and compacting the two sides to the middle to obtain an inoculated cored wire; specific parameters are shown in table 2.
TABLE 2 Table of parameters of inoculation of cored wire used in examples of the present invention
Example 1
The vermicular cast iron thick valve body is produced, the whole casting is thick and large, and a heating riser is used; by adopting the preparation method disclosed by the prior art (see CN103014232A), local carbides, coarse graphite at partial positions and distortion occur; after detection, a graphite phase diagram (left diagram) and a matrix phase diagram (right diagram) of the product are shown in a figure 1, and product detection data are shown in a table 3.
TABLE 3 various performance test data of the vermicular cast iron thick and big valve body obtained by the preparation method disclosed in the prior art
By using the yttrium-based heavy rare earth magnesium alloy cored wire provided by the invention, the metallographic structure of a casting can be improved, and a vermicular graphite cast iron material with uniform and compact graphite structure distribution, no coarse graphite and no carbide is obtained; the preparation method comprises the following steps:
tapping the base iron by using a casting ladle, adding Cu accounting for 0.6 percent of the mass of the base iron and Sn accounting for 0.06 percent of the mass of the base iron, performing vermicularizing and inoculation wire feeding treatment, controlling the temperature to be 1450-1460 ℃, and treating 2500kg of the weight of the base iron at one time; firstly, carrying out vermicularizing treatment on yttrium-based heavy rare earth magnesium alloy core-spun yarns: the feeding length of yttrium-based heavy rare earth magnesium alloy core-spun yarn is 20.8m, and the feeding speed is 20 m/s; and then adopting inoculated core-spun yarn for inoculation treatment: the core-spun yarn feeding length is 4m, and the yarn feeding speed is 18 m/s; and obtaining vermicular cast iron thick and large valve body, and pouring for 4min at 1400 ℃ after slagging-off, temperature measurement and component detection in sequence.
The thick vermicular cast iron casting (the vermicular cast iron thick large valve body) obtained by the preparation method provided by the embodiment 1 of the invention comprises the following components: 3.76 wt% of C, 2.10 wt% of Si, 0.60 wt% of Mn, 0.050 wt% of P, 0.014 wt% of Mg, 0.005 wt% of Y and 0.008 wt% of La.
After detection, a graphite phase diagram (left diagram) and a matrix phase diagram (right diagram) of the product are shown in a figure 2, and product detection data are shown in a table 4.
Table 4 data for testing various performances of the thick and large valve body of vermicular cast iron obtained by the preparation method provided in embodiment 1 of the present invention
| Tensile strength/MPa | hardness/HBW | Elongation/percent | Creep rate/%) | Pearlite/% |
| 450 | 210 | 3.0 | 80 | 85 |
Example 2
The large vermicular graphite cast iron cylinder body is produced, the casting pouring weight is 4800kg, the casting is slowly cooled by adopting the preparation method disclosed by the prior art (see CN103014232A), and chill is used in many places to generate vermicular fading; after detection, a graphite phase diagram of the product is shown in fig. 3, and detection data of the product is shown in table 5.
Table 5 various performance test data of large vermicular cast iron cylinder test block obtained by the preparation method disclosed in the prior art
| Tensile strength/MPa | hardness/HBW | Elongation/percent | Creep rate/%) | Pearlite/% |
| 450 | 222 | 1.5 | 90 | 85 |
By using the yttrium-based heavy rare earth magnesium alloy core-spun yarn provided by the invention, the metallographic structure of a casting can be improved, a compacted vermicular cast iron material with uniformly distributed graphite structures can be obtained, and the vermicular fading can be avoided; the preparation method comprises the following steps:
tapping the base iron by using a casting ladle, adding Cu accounting for 0.6 percent of the mass of the base iron and Sn accounting for 0.06 percent of the mass of the base iron, and then carrying out creeping treatment and inoculation wire feeding treatment, wherein the temperature is controlled to be 1450-1460 ℃, and the weight of the base iron is 4800kg in one-time treatment; firstly, carrying out vermicularizing treatment on yttrium-based heavy rare earth magnesium alloy core-spun yarns: the feeding length of yttrium-based heavy rare earth magnesium alloy core-spun yarn is 36m, and the feeding speed is 50 m/s; and then adopting inoculated core-spun yarn for inoculation treatment: the core-spun yarn feeding length is 8m, and the yarn feeding speed is 45 m/s; obtaining vermicular cast iron, and pouring at 1380 ℃ for 1min after slagging-off, temperature measurement and component detection in sequence to obtain the large vermicular cast iron cylinder body.
The thick and large vermicular cast iron casting (large vermicular cast iron cylinder) obtained by the preparation method provided by the embodiment 1 of the invention comprises the following components: 3.77 wt% of C, 2.20 wt% of Si, 0.60 wt% of Mn, 0.050 wt% of P, 0.018 wt% of Mg, 0.006 wt% of Y and 0.0075 wt% of La.
After detection, a graphite phase diagram of the product is shown in fig. 4, and detection data of the product is shown in table 6.
Table 6 data for detecting various properties of large vermicular cast iron cylinder (test block) obtained by the preparation method provided in embodiment 2 of the present invention
| Tensile strength/MPa | hardness/HBW | Elongation/percent | Creep rate/%) | Pearlite/% |
| 530 | 231 | 2.5 | 85 | 85 |
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A yttrium-based heavy rare earth magnesium alloy cored wire comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Mg 5wt％～15wt％；
Si 40wt％～60wt％；
Y 1.2wt％～2.1wt％；
La 2.1wt％～4.2wt％；
the balance of Fe.
2. The yttrium-based heavy rare earth magnesium alloy cored wire of claim 1, wherein the diameter of the yttrium-based heavy rare earth magnesium alloy cored wire is 8mm to 13mm, the wire weight is 350g/m to 550g/m, and the core dose is 220g/m to 450 g/m.
3. A preparation method of a thick vermicular cast iron casting comprises the following steps:
a) tapping the base iron, adding alloy elements, performing vermicularizing and inoculation wire feeding treatment, and pouring to obtain a thick and large vermicular cast iron casting after slagging-off, temperature measurement and component detection in sequence;
the vermicular cored wire used in the vermicular and inoculation wire feeding process is the yttrium-based heavy rare earth magnesium alloy cored wire of any one of claims 1-2.
4. The method according to claim 3, wherein the ingredients of the molten base iron in step a) include:
C 3.50wt％～3.90wt％；
Si 1.90wt％～2.3wt％；
Mn≤0.7wt％；
S 0.009wt％～0.020wt％；
P≤0.070wt％。
5. a method according to claim 3, wherein the tapping in step a) is ladle tapping; the additional alloying element is selected from copper and/or tin.
6. The method of claim 3, wherein the inoculation of the cored wire used in the creep and inoculation feeding treatment in step a) comprises:
a skin;
an alloy powder coated in the sheath;
the alloy powder comprises the following components:
Si 55wt％～75wt％；
Ba 3wt％～10wt％；
the balance of Fe.
7. The method for preparing according to claim 3, wherein the creeping and inoculating wire feeding treatment in step a) is carried out by:
firstly, vermicular treatment is carried out on vermicular cored wires, and then inoculation treatment is carried out on inoculated cored wires.
8. The preparation method according to claim 7, wherein the feeding length of the vermicular-treated vermicular core-spun yarn is 20m to 40m, and the feeding speed is 15m/s to 55 m/s;
the wire feeding length of the inoculated cored wire subjected to inoculation is 2-10 m, and the wire feeding speed is 13-50 m/s.
9. The method of claim 3, wherein the temperature of the creep and inoculation feed treatment in step a) is 1430 ℃ to 1480 ℃.
10. The method according to claim 3, wherein the temperature of the casting in step a) is 1320-1410 ℃ and the time is 20 s-10 min.
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