CN112267059A - Treatment process for enhancing mechanical property of nodular cast iron - Google Patents

Treatment process for enhancing mechanical property of nodular cast iron Download PDF

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Publication number
CN112267059A
CN112267059A CN202011112918.7A CN202011112918A CN112267059A CN 112267059 A CN112267059 A CN 112267059A CN 202011112918 A CN202011112918 A CN 202011112918A CN 112267059 A CN112267059 A CN 112267059A
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treatment process
ball
cast iron
nodular cast
treatment
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王辅成
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Anhui Junming Machinery Manufacturing Co ltd
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Anhui Junming Machinery Manufacturing Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • 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
    • C21C1/10—Making spheroidal graphite cast-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D5/00—Heat treatments of cast-iron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/04—Cast-iron alloys containing spheroidal graphite
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C37/00—Cast-iron alloys
    • C22C37/10—Cast-iron alloys containing aluminium or silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
    • B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The invention discloses a treatment process for enhancing the mechanical property of nodular cast iron; relates to the technical field of cast iron, comprising the following steps: (1) adding materials; (2) preparing a silicon material; (3) smelting; (4) carrying out isothermal treatment; the process can improve the structure performance of the nodular cast iron, greatly improve the mechanical property of the nodular cast iron, and particularly greatly improve the tensile property and the impact toughness. The nodular cast iron prepared by the method has excellent normal-temperature impact toughness and low-temperature impact toughness, can better adapt to cold environment, and prolongs the service life of the nodular cast iron.

Description

Treatment process for enhancing mechanical property of nodular cast iron
Technical Field
The invention belongs to the technical field of cast iron, and particularly relates to a treatment process for enhancing the mechanical property of nodular cast iron.
Background
Since the English man Moro in 1947, Ce nodular cast iron is firstly prepared, as a metal material with weight, nodular cast iron begins to appear in the vision of people, the production of the Ce nodular cast iron is a great technical innovation in the application technology of ferrous metal after the steelmaking technology is invented by human beings, and the nodular cast iron gradually replaces high-performance engineering materials such as forged steel, cast steel, malleable cast iron and the like and is widely applied to the fields of automobiles, machinery, buildings and the like due to good mechanical property, casting property and lower cost.
In recent years, with the development of economic society, the traditional nodular cast iron cannot meet the requirements of industries, and as a structural member material, the nodular cast iron plays an important role in the fields of large machine tools, wind power industry and the like, such as nodular cast iron wind power hubs, wind power equipment gear boxes and the like, and the nodular cast iron is gradually used in outdoor cold and severe environment, so that the nodular cast iron is required to have excellent mechanical properties and good low-temperature resistance.
Disclosure of Invention
The invention aims to provide a treatment process for enhancing the mechanical property of nodular cast iron, so as to solve the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a treatment process for enhancing mechanical properties of nodular cast iron comprises the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a;
adding the ball grinding material a into a mould for pressing to obtain an addition block material a;
(2) preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b;
adding the ball grinding material b into a mould for pressing to obtain an addition block material b;
(3) smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part;
the pouring temperature is 1350-;
(4) isothermal treatment:
the basic piece is processed for 1-2 hours at the temperature of 880-920-.
In the step (1), the mixing mass ratio of the carbon powder, the titanium powder and the iron powder is 1-2:4-5: 10-12.
The weight ratio of the ethanol to the carbon powder is 2: 1.
The ball-material ratio of the ball-milling treatment in the step (1) is 12:1, and the ball-milling treatment time is 20 h.
In the step (2), the mixing weight ratio of the silicon powder to the iron powder is 1: 1;
the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2.
The ball material ratio of the ball grinding treatment in the step (2) is 8: 1;
the ball milling time was 25 hours.
The adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80.
The chemical components of the base part are as follows: 3.02-3.14wt.% carbon, 2.15-2.20wt.% silicon, 0.47wt.% manganese, 0.004wt.% phosphorus, 0.006wt.% sulfur, 0.028wt.% magnesium, 0.112-0.120wt.% titanium.
The quenching is water quenching.
Titanium has an atomic number of 22 and an outer electronic structure of 3d24S2The ball milling material is introduced into a ductile iron melt, titanium and carbon react in the melt to form titanium carbide in a combined manner, because the energy change during the eutectoid transformation of the ductile cast iron is small, titanium carbide particles are formed before the eutectoid transformation, cementite preferentially forms nuclei at the original austenite grain boundary and nearby titanium carbide when the temperature is reduced to the eutectoid reaction temperature, then carbon atoms diffuse to form ferrite nuclei at two sides, the cementite and the ferrite alternately grow at the same time, and finally, the cementite and the ferrite alternately grow around the titanium carbideA plurality of differently oriented "pearlite grains" are formed.
The invention increases ferrite grain size value, continuously reduces grain size and has obvious grain refining effect through the synergistic action of the formation of titanium carbide and the silicon dioxide in the silicon micro powder, meanwhile, the introduction of the silicon dioxide and the titanium carbide particles can more obviously limit the grain boundary migration, the quantity of spherical graphite in the ductile iron casting is obviously increased, and the ratio of the cluster flocculent graphite to the worm graphite is correspondingly reduced.
The invention obviously increases the content of the retained austenite in the gradual structure through isothermal treatment, obviously increases the gradual elongation and the impact toughness through the increase of the content of the retained austenite, and simultaneously, the isothermal treatment of the invention can more fully diffuse carbon atoms, thereby greatly improving the structure of the casting.
Has the advantages that:
the process can improve the structure performance of the nodular cast iron, greatly improve the mechanical property of the nodular cast iron, and particularly greatly improve the tensile property and the impact toughness.
The nodular cast iron prepared by the method has excellent normal-temperature impact toughness and low-temperature impact toughness, can better adapt to cold environment, and prolongs the service life of the nodular cast iron.
The method can obviously improve the tensile property of the ductile iron casting, obviously increase the tensile strength and the elongation rate, and greatly improve the application range of the ductile iron casting.
Detailed Description
A treatment process for enhancing mechanical properties of nodular cast iron comprises the steps of introducing graphene composite particles into the nodular cast iron to obtain a finished product nodular cast iron part;
the introduction is to add the graphene composite particles subjected to ball milling treatment into molten state ball-milled cast iron;
the ball milling treatment is mixing and ball milling treatment of iron powder and graphene composite particles;
the addition amount of the graphene composite particles in the finished product nodular iron casting is 0.25-0.33 wt.%.
The preparation method of the graphene composite particles comprises the following steps:
mixing graphene, ammonia water and absolute ethyl alcohol together to obtain graphene ammonia water-ethyl alcohol solution;
mixing vinyl tri (beta-methoxyethoxy) silane, absolute ethyl alcohol and glacial acetic acid in sequence to obtain vinyl tri (beta-methoxyethoxy) silane dispersion liquid;
dropping graphene ammonia water ethanol into vinyl tri (beta-methoxyethoxy) silane dispersion liquid, stirring while dropping, standing for 10-14 hours after dropping, performing ultrasonic treatment for 5-8min, performing irradiation treatment, standing for 1.5 hours at 50-55 ℃, performing freeze drying to obtain a reactant, cleaning the reactant by using deionized water, drying in a drying box for 10 hours, calcining in a muffle furnace for 2 hours, and naturally cooling to room temperature.
The mixing ratio of the graphene to the ammonia water to the absolute ethyl alcohol is 30-40 g: 200mL of: 250 mL;
the ammonia water is saturated ammonia water.
In the vinyl tri (beta-methoxyethoxy) silane dispersion liquid, the mass fraction of the vinyl tri (beta-methoxyethoxy) silane is 9%;
the mixing volume ratio of the absolute ethyl alcohol to the glacial acetic acid is 4: 1.
The volume ratio of the graphene ammonia water ethanol solution to the vinyl tri (beta-methoxyethoxy) silane dispersion liquid is 1: 1.2-1.5.
The ultrasonic frequency is 35kHz, and the power is 500W;
the irradiation dose of the irradiation treatment is 120-130 kGy;
the freeze drying temperature is 35 ℃ below zero;
the calcining temperature in the muffle furnace is 950 ℃.
The mixing mass ratio of the iron powder to the graphene composite particles is 1.4-1.6: 1.
The ball milling treatment comprises the following steps: the ball milling time is 20 hours, the ball milling auxiliary agent is glycerol, and the ball milling rotating speed is 250 r/min.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1
A treatment process for enhancing mechanical properties of nodular cast iron comprises the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a; adding the ball grinding material a into a mould for pressing to obtain an addition block material a; the mixing mass ratio of the carbon powder, the titanium powder and the iron powder is 1:4: 10. The weight ratio of the ethanol to the carbon powder is 2: 1. The ball-material ratio of the ball-milling treatment is 12:1, and the ball-milling treatment time is 20 h.
(2) Preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b; adding the ball grinding material b into a mould for pressing to obtain an addition block material b; the mixing weight ratio of the silicon micropowder to the iron powder is 1: 1; the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2. The ball-material ratio of the ball-milling treatment is 8: 1; the ball milling time was 25 hours.
(3) Smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part; the adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80. The chemical components of the base part are as follows: 3.02wt.% carbon, 2.15wt.% silicon, 0.47wt.% manganese, 0.004wt.% phosphorus, 0.006wt.% sulfur, 0.028wt.% magnesium, 0.112wt.% titanium. The pouring temperature is 1350 ℃;
(4) isothermal treatment:
and (3) carrying out heat preservation treatment on the basic piece at 880 ℃ for 1 hour, then quenching to 340 ℃, preserving heat for 2 hours, then moving to 220 ℃, continuing preserving heat for 3 hours, and then cooling to room temperature in air. The quenching is water quenching.
Example 2
A treatment process for enhancing mechanical properties of nodular cast iron comprises the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a; adding the ball grinding material a into a mould for pressing to obtain an addition block material a; the mixing mass ratio of the carbon powder, the titanium powder and the iron powder is 2:5: 12. The weight ratio of the ethanol to the carbon powder is 2: 1. The ball-material ratio of the ball-milling treatment is 12:1, and the ball-milling treatment time is 20 h.
(2) Preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b; adding the ball grinding material b into a mould for pressing to obtain an addition block material b; the mixing weight ratio of the silicon micropowder to the iron powder is 1: 1; the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2. The ball-material ratio of the ball-milling treatment is 8: 1; the ball milling time was 25 hours.
(3) Smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part; the adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80. The chemical components of the base part are as follows: 3.14wt.% carbon, 2.20wt.% silicon, 0.47wt.% manganese, 0.004wt.% phosphorus, 0.006wt.% sulfur, 0.028wt.% magnesium, 0.120wt.% titanium. The casting temperature is 1400 ℃;
(4) isothermal treatment:
and (3) insulating the base piece at 920 ℃ for 2 hours, then quenching to 350 ℃, insulating for 2 hours, then moving to 230 ℃, continuously insulating for 3 hours, and then cooling to room temperature in air. The quenching is water quenching.
Example 3
A treatment process for enhancing mechanical properties of nodular cast iron comprises the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a; adding the ball grinding material a into a mould for pressing to obtain an addition block material a; the mixing mass ratio of the carbon powder to the titanium powder to the iron powder is 1.3:4.4: 11. The weight ratio of the ethanol to the carbon powder is 2: 1. The ball-material ratio of the ball-milling treatment is 12:1, and the ball-milling treatment time is 20 h.
(2) Preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b; adding the ball grinding material b into a mould for pressing to obtain an addition block material b; the mixing weight ratio of the silicon micropowder to the iron powder is 1: 1; the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2. The ball-material ratio of the ball-milling treatment is 8: 1; the ball milling time was 25 hours.
(3) Smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part; the adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80. The chemical components of the base part are as follows: carbon 3.065wt.%, silicon 2.17wt.%, manganese 0.47wt.%, phosphorus 0.004wt.%, sulfur 0.006wt.%, magnesium 0.028wt.%, titanium 0.116 wt.%. The casting temperature is 1370 ℃;
(4) isothermal treatment:
and (3) carrying out heat preservation treatment on the base piece at 885 ℃ for 1.5 hours, then quenching to 343 ℃, preserving heat for 2 hours, then moving to 224 ℃, continuing preserving heat for 3 hours, and then cooling to room temperature in air. The quenching is water quenching.
Example 4
A treatment process for enhancing mechanical properties of nodular cast iron comprises the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a; adding the ball grinding material a into a mould for pressing to obtain an addition block material a; the mixing mass ratio of the carbon powder to the titanium powder to the iron powder is 1.5:4.7: 11. The weight ratio of the ethanol to the carbon powder is 2: 1. The ball-material ratio of the ball-milling treatment is 12:1, and the ball-milling treatment time is 20 h.
(2) Preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b; adding the ball grinding material b into a mould for pressing to obtain an addition block material b; the mixing weight ratio of the silicon micropowder to the iron powder is 1: 1; the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2. The ball-material ratio of the ball-milling treatment is 8: 1; the ball milling time was 25 hours.
(3) Smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part; the adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80. The chemical components of the base part are as follows: 3.10wt.% carbon, 2.18wt.% silicon, 0.47wt.% manganese, 0.004wt.% phosphorus, 0.006wt.% sulfur, 0.028wt.% magnesium, 0.116wt.% titanium. The casting temperature is 1390 ℃;
(4) isothermal treatment:
and (3) carrying out heat preservation treatment on the base piece at 910 ℃ for 1.2 hours, then quenching to 345 ℃, carrying out heat preservation for 2 hours, then moving to 228 ℃, continuing to carry out heat preservation for 3 hours, and then carrying out air cooling to room temperature. The quenching is water quenching.
Test of
Impact toughness:
impact tests at room temperature and low temperature (-20 ℃) were carried out on a JBW-3008 type impact tester: measuring the sectional area of the notch of the sample before the experiment, calculating the impact toughness according to the impact energy value, and taking the average value of 5 times of results;
TABLE 1
Room temperature impact toughness (J/cm) Impact toughness at-20 ℃ (J/cm)
Example 1 10.91 8.98
Example 2 10.82 8.77
Example 3 11.01 9.33
Example 4 11.25 9.76
Comparative example 1 9.12 7.96
Blank control group 8.24 6.18
Comparative example 1: the difference from the embodiment 1 is that the adding block a is replaced by a mixture of titanium carbide particles and iron powder, and the mass of each element is unchanged;
as can be seen from table 1, the nodular cast iron prepared by the method of the present invention has excellent normal temperature impact toughness and low temperature impact toughness, can better adapt to cold environment, and has a longer service life.
Tensile properties;
the samples were subjected to tensile testing in a WAW-200 tensile tester at a tensile rate of 0.0167mm/s for 3 runs each, and the average values were taken (sample is a cylinder with a diameter of 10 mm):
TABLE 2
Tensile strength MPa Elongation percentage%
Example 1 538 16.39
Example 2 532 16.21
Example 3 545 16.53
Example 4 552 16.94
Blank control group 502 14.06
Blank control group: adding no additional block material a or adding no additional block material b;
as can be seen from Table 2, the method of the invention can significantly improve the tensile property of the ductile iron casting, and both the tensile strength and the elongation rate are significantly increased, thereby greatly improving the application range of the ductile iron casting.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.

Claims (9)

1. A treatment process for enhancing mechanical properties of nodular cast iron is characterized by comprising the following steps:
(1) adding materials:
mixing carbon powder, titanium powder and iron powder together, adding ethanol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material a;
adding the ball grinding material a into a mould for pressing to obtain an addition block material a;
(2) preparing a silicon material:
mixing the silicon micropowder and the iron powder together, adding glycerol, uniformly stirring, performing ball milling treatment by using a ball mill, and drying to obtain a ball grinding material b;
adding the ball grinding material b into a mould for pressing to obtain an addition block material b;
(3) smelting:
adding the adding block material a, the adding block material b and the ductile iron base material into an induction furnace for smelting, casting into a mold after spheroidizing inoculation, and cooling and molding to obtain a basic part;
the pouring temperature is 1350-;
(4) isothermal treatment:
the basic piece is processed for 1-2 hours at the temperature of 880-920-.
2. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: in the step (1), the mixing mass ratio of the carbon powder, the titanium powder and the iron powder is 1-2:4-5: 10-12.
3. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 2, wherein: the weight ratio of the ethanol to the carbon powder is 2: 1.
4. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: the ball-material ratio of the ball-milling treatment in the step (1) is 12:1, and the ball-milling treatment time is 20 h.
5. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: in the step (2), the mixing weight ratio of the silicon powder to the iron powder is 1: 1;
the mixing weight ratio of the glycerol to the silicon micropowder is 1: 2.
6. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: the ball material ratio of the ball grinding treatment in the step (2) is 8: 1;
the ball milling time was 25 hours.
7. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: the adding block material a, the adding block material b and the ductile iron base material are mixed according to the mass ratio: 2.5:1.2:80.
8. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: the chemical components of the base part are as follows: 3.02-3.14wt.% carbon, 2.15-2.20wt.% silicon, 0.47wt.% manganese, 0.004wt.% phosphorus, 0.006wt.% sulfur, 0.028wt.% magnesium, 0.112-0.120wt.% titanium.
9. The treatment process for enhancing the mechanical property of nodular cast iron as claimed in claim 1, wherein the treatment process comprises the following steps: the quenching is water quenching.
CN202011112918.7A 2020-10-17 2020-10-17 Treatment process for enhancing mechanical property of nodular cast iron Pending CN112267059A (en)

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Application publication date: 20210126