CN109425564A - A kind of SAE6150 spring steel wire rod autstenitic grain size detection method - Google Patents
A kind of SAE6150 spring steel wire rod autstenitic grain size detection method Download PDFInfo
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- CN109425564A CN109425564A CN201710782183.0A CN201710782183A CN109425564A CN 109425564 A CN109425564 A CN 109425564A CN 201710782183 A CN201710782183 A CN 201710782183A CN 109425564 A CN109425564 A CN 109425564A
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- 229910000639 Spring steel Inorganic materials 0.000 title claims abstract description 51
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 23
- 230000007797 corrosion Effects 0.000 claims abstract description 23
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 9
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 239000013078 crystal Substances 0.000 claims description 18
- 238000005498 polishing Methods 0.000 claims description 18
- OXNIZHLAWKMVMX-UHFFFAOYSA-N picric acid Chemical compound OC1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O OXNIZHLAWKMVMX-UHFFFAOYSA-N 0.000 claims description 16
- 239000011521 glass Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 14
- 241000282326 Felis catus Species 0.000 claims description 13
- 238000004851 dishwashing Methods 0.000 claims description 13
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000003518 caustics Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 239000011260 aqueous acid Substances 0.000 claims description 8
- 235000019658 bitter taste Nutrition 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000227 grinding Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 239000002826 coolant Substances 0.000 claims description 2
- RZYKUPXRYIOEME-UHFFFAOYSA-N CCCCCCCCCCCC[S] Chemical compound CCCCCCCCCCCC[S] RZYKUPXRYIOEME-UHFFFAOYSA-N 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 229910001566 austenite Inorganic materials 0.000 abstract description 38
- 238000000034 method Methods 0.000 description 32
- 229910000831 Steel Inorganic materials 0.000 description 19
- 239000010959 steel Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 5
- 230000001590 oxidative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011895 specific detection Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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Abstract
The present invention relates to a kind of SAE6150 spring steel wire rod autstenitic grain size detection methods, and steps are as follows: (1) sample is heat-treated；Sample preparation；(3) grind away；(4) corrosion reagent is prepared；(5) etch；(6) grain size is graded.Solve the problems, such as that the austenite grain boundary that prior art occurs in the detection of SAE6150 spring steel wire rod autstenitic grain size shows unintelligible and leads to not effectively grade, realization shows the full apparent of SAE6150 autstenitic grain size, accurately assesses SAE6150 spring steel wire rod autstenitic grain size.
Description
Technical field
The invention belongs to technical field of metallurgy industry, are related to a kind of SAE6150 spring steel wire rod autstenitic grain size detection
Method.
Background technique
Referring to Fig. 1, austenite is the high temperature microstructure of steel.Steel is heated to AC3More than, to obtain complete austenite structure
Process is known as austenitizing.In heating transformation, austenite grain that is newly being formed and just contacting with each other, which is known as austenite, to be risen
Beginning crystal grain, size are known as primary grain degree.Austenite primary grain is generally all very tiny, but as the temperature rises, heat preservation
The extension of time, austenite grain are just constantly grown up, and length to austenite grain when just beginning to cool is known as actual die, big
Small to be known as prior austenite grain size, the actual die size of austenite has a significant impact to the microstructure and property of steel.
The austenite grain size of steel influences the tissue and performance of cooling transformation product significantly, to the intensity, toughness of steel
Have a significant impact with performance indicators such as fatigue resistances.If austenite grain is uniformly tiny, the group of phase-change product after cooling
Knit also uniformly tiny, the intensity of steel, plasticity and toughness are higher；But if austenite grain is coarseer, then the metallographic after phase transformation
Organizational coarseness, is distributed also uneven, and the intensity of steel, plasticity and toughness are lower.In addition, the group of autstenitic grain size or Study on Steel
Knit a kind of genetic indispensable research means.Therefore, certain important steel products such as American Standard SAE6150 spring steel disk
Item is distinctly claimed Examining Austenite Grain Size before factory.
According to GB/T6394-2002 " metal mean grain size measuring method ", the autstenitic grain size of steel has 7 kinds of measurement sides
Method: correlation method, acieration, simulation acieration, ferrite net method, oxidizing process, method of directly hardening and cementite network method.For middle height
Carbon steel, most of autstenitic grain size measuring method are not appropriate for, and more commonly used method is oxidizing process and method of directly hardening.
Oxidizing process is to show austenite the characteristics of crystal boundary preferential oxidation to micropore diffusion at high temperature using oxygen atom
Grain size.Due to metal chemical activity its crystal boundary and it is transgranular be different, metal has larger activity, easily quilt on crystal boundary
Oxidation, when sample is heated at high temperature, the oxide thickness formed on specimen surface is different on intra-die and crystal boundary, brilliant
Oxide in boundary is thicker than intra-die.By appropriate grinding and polishing, intra-die oxide is ground off, makes sample only in grain boundaries
There are oxides, characterize autstenitic grain size by the display to oxide.The austenite that oxidizing process is shown in the industry at present
Grain size has viewpoint to think grain size shown by oxidizing process sometimes and be frequently not the austenite grain of steel there are larger dispute
Degree, but austenite adds ferrite grain size, even ferrite grain size, this is because steel during heating surface due to
The inhomogeneities of decarburization and prolonged heat preservation, cause crystal grain to be grown up and local grain fast growth, this will give austenite crystal
The inspection and grading of granularity bring difficulty, or even derive a wrong conclusion.
The principle for method of directly hardening is by cold water of after steel austenitizing, directly quenching, and the austenite of high temperature is due to very big
Degree of supercooling shear form martensite, martensite followed the boundary of original austenite grain completely, shown to martensite boundary
Show to characterize autstenitic grain size.Concrete operation method is that sample is placed in heating stove heating (for carbon content≤0.35%
Carbon steel and steel alloy, heating temperature are 900 DEG C ± 10 DEG C；When carbon content > 0.35%, heating temperature is 860 DEG C ± 10 DEG C),
1h is kept the temperature, is quenched so that hardened throughout cooling velocity can be generated, to obtain martensitic structure, is shown after rubbing down and etch
It is hardened completely out for the original austenite grain shape pattern of martensite.It can be tempered 15min at 230 DEG C ± 10 DEG C before corrosion, to change
Kind contrast.
Method of directly hardening is considered that in the industry autstenitic grain size detects referee method, and result is accurate and reliable, display
Autstenitic grain size is true original austenite grain degree.But the corrosion of austenite grain boundary is shown always in method of directly hardening
Generally acknowledged difficult point in the industry.With the increase of carbon content in steel, the Faxian that directly hardens shows that the difficulty of grain size also increases with it, especially
When carbon content is more than eutectoid composition of steel in steel, display austenite grain boundary is more difficult.This is because medium and high carbon steel room temperature tissue
For pearlite and ferrite, alloy content is less, and alloy segregation is few on crystal boundary, and crystal boundary energy is low, and austenite grain boundary is caused to corrode pole
It is difficult.
It is water-soluble that GB/T6394-2002 " metal mean grain size measuring method " is recommended to use the saturation picric acid containing corrosion inhibiter
Corrosion shows autstenitic grain size, but autstenitic grain size display effect is by corrosion reagent ingredient, etching time and corrosion temperature
Degree is affected, and specific corrosion reagent formula, the temperature of corrosion and etching time contain with different steel grade carbon contents and alloy
The difference of amount and have bigger difference, need voluntarily to grope by a large number of experiments.There is presently no specific to SAE6150 spring steel
The detection method of wire rod autstenitic grain size.Attached drawing 1 be inventor empirically using saturation bitter taste aqueous acid be added 3~
Constant temperature corrodes SAE6150 spring steel wire rod austenite shown by 3~4 minutes at 80~85 DEG C after the white cat board dish washing liquid of 4ml
Grain size, the austenite grain boundary shown is smudgy, can not accurately assess SAE6150 spring steel wire rod austenite grain
Degree, leads to not effectively instruct SAE6150 spring steel production technology.
Inventor's discovery application number: 201410368339.7, subject name is " wear-resisting 450 steel autstenitic grain size detection
Method ", discloses a kind of wear-resisting 450 steel autstenitic grain size detection method, and the detection method in this application cannot be effectively applicable in
The detection of SAE6150 spring steel wire rod autstenitic grain size, according to the detection method in this application to SAE6150 spring steel wire rod
Test is repeated in sample, and sample burnishing surface can not detect SAE6150 spring steel wire rod austenite grain almost without reaction
Degree.
Therefore, it is necessary to study a kind of SAE6150 spring steel wire rod autstenitic grain size detection method out, realizations pair
The full apparent of SAE6150 austenite grain boundary is shown, accurately assesses SAE6150 spring steel wire rod autstenitic grain size, is effectively referred to
Lead SAE6150 spring steel production technology.
Summary of the invention
In order to overcome the disadvantages mentioned above of the prior art, the present invention provides a kind of SAE6150 spring steel wire rod austenite grain
Detection method is spent, solves Austria that prior art occurs in the detection of SAE6150 spring steel wire rod autstenitic grain size
Family name's body Display of Grain Boundary is unintelligible and leads to not the problem of effectively grading, and realizes to the comprehensive clear of SAE6150 autstenitic grain size
Clear display accurately assesses SAE6150 spring steel wire rod autstenitic grain size.
The technical solution adopted by the present invention to solve the technical problems is: a kind of SAE6150 spring steel wire rod austenite crystal
Particle size detection method, steps are as follows:
(1) sample is heat-treated: SAE6150 spring steel wire rod sample is put into resistance furnace, it is small in 850~870 DEG C of heated at constant temperature 1
When, it then quickly removes in cold water of quenching；
(2) sample preparation: sample of the interception by quenching is inlayed with inlay and metallographic specimen is made；
(3) grind away: the metallographic specimen made is roughly ground with polished machine, fine grinding and polishing；
(4) it prepares corrosion reagent: pouring into 100ml water to beaker, with 50~55 DEG C of constant temperature are heated in thermostat water bath, then use
Tweezers are continuously added picric acid and are stirred continuously solution with glass bar, contain not molten picric acid until being formed in the visible solution of naked eyes
Then the supersaturated bitter taste aqueous acid of crystal grain adds the white cat board dish washing liquid of 9~10ml, with 1~2 point of glass bar agitating solution
Clock keeps solution composition, temperature uniform；
(5) etch: polished SAE6150 metallographic specimen polishing is immersed in corrosive agent up, is stirred continuously solution, etch
7~8 minutes, then sample is taken out, is rinsed with water specimen surface, and with velvet polishing cloth gently wipe remove specimen surface it is anti-
Product is answered, then with washes of absolute alcohol and is dried up；
(6) grain size is graded: being graded under metallographic microscope to SAE6150 spring steel wire rod autstenitic grain size.
In step (1), it is 850~870 DEG C that sample, which is heat-treated heating temperature, and the heated at constant temperature time is 1 hour, and quenching uses
Cooling medium be cold water.
In step (4), corrosive agent preparation is continuously added after 100ml water is heated to 50~55 DEG C of constant temperature, then with tweezers
Picric acid, while it being stirred continuously solution with glass bar, until forming the mistake for containing not molten picric acid crystal grain in the visible solution of naked eyes
Be saturated bitter taste aqueous acid, then add the white cat board dish washing liquid of 9~10ml, stirred with glass bar make within 1~2 minute solution at
Point, temperature it is uniform.
In step (4), it is 1 containing mass percent that the white cat board dish washing liquid, which is that 500g fills Shanghai White cat board dish washing liquid,
~3% dodecyl sodium sulfate.
In step (5), sample etch is that polishing is immersed in corrosive agent up, is stirred continuously solution, etch 7~8 minutes.
The beneficial effects of the present invention are: 1. are compared by using supersaturated bitter taste aqueous acid, white cat board dish washing liquid as certain
Example is hybridly prepared into corrosive agent, and constant temperature can achieve and only corrode out to SAE6150 sample etch 7~8 minutes at 50~55 DEG C
Effect of the austenite grain boundary without showing matrix, can show to full apparent SAE6150 sample austenite grain boundary, subject to
Really evaluation SAE6150 spring steel wire rod autstenitic grain size creates condition；
2. providing a kind of clearly reliable technical solution for the detection of SAE6150 spring steel wire rod autstenitic grain size, solve
The austenite grain boundary that prior art occurs in the detection of SAE6150 spring steel wire rod autstenitic grain size shows unclear
It is clear to lead to not the problem of effectively grading；
The features such as 3. having rational technology, easy to operate, test material is easy to obtain, and corrosion reagent is easy to prepare, practical and efficient.
Detailed description of the invention
Fig. 1 is the autstenitic grain size picture of prior art corrosion SAE6150 sample；
Fig. 2 is in embodiment 1 in the autstenitic grain size picture of 40~45 DEG C of constant temperature corrosion SAE6150 samples；
Fig. 3 is in embodiment 2 in the autstenitic grain size picture of 50~55 DEG C of constant temperature corrosion SAE6150 samples；
Fig. 4 is in embodiment 3 in the autstenitic grain size picture of 70~75 DEG C of constant temperature corrosion SAE6150 samples；
Fig. 5 is the process flow chart of the method for the present invention.
Specific embodiment
The present invention is further described for 2~Fig. 5 and embodiment with reference to the accompanying drawing.
Embodiment 1:
The main chemical compositions mass percent of SAE6150 spring steel wire rod be C:0.48%~0.53%, Si:0.15%~
0.35%, Mn:0.70%~0.90%, Cr:0.80%~1.10%, V:0.15%~0.25%.Specific detection method as follows into
Row:
(1) sample is heat-treated: SAE6150 spring steel wire rod sample is put into resistance furnace, it is small in 850~870 DEG C of heated at constant temperature 1
When, it then quickly removes in cold water of quenching；
(2) sample preparation: sample of the interception by quenching is inlayed with inlay and metallographic specimen is made；
(3) grind away: the metallographic specimen made is roughly ground with polished machine, fine grinding and polishing；
(4) it prepares corrosion reagent: pouring into 100ml water to beaker, with 40~45 DEG C of constant temperature are heated in thermostat water bath, then use
Tweezers are continuously added picric acid and are stirred continuously solution with glass bar, contain not molten picric acid until being formed in the visible solution of naked eyes
Then the supersaturated bitter taste aqueous acid of crystal grain adds the white cat board dish washing liquid of 9~10ml, with 1~2 point of glass bar agitating solution
Clock keeps solution composition, temperature uniform；
(5) etch: polished SAE6150 metallographic specimen polishing is immersed in corrosive agent up, is stirred continuously solution, etch
7~8 minutes, then sample is taken out, is rinsed with water specimen surface, and with velvet polishing cloth gently wipe remove specimen surface it is anti-
Product is answered, then with washes of absolute alcohol and is dried up；
(6) grain size is graded: being graded under metallographic microscope to SAE6150 spring steel wire rod autstenitic grain size.
The SAE6150 spring steel wire rod autstenitic grain size observed under metallographic microscope is as shown in Figure 2.As can be seen that
In 40~45 DEG C of constant temperature corrosion display SAE6150 spring steel wire rod autstenitic grain sizes, part crystal boundary out, Wu Faquan can only be corroded
Face shows sample autstenitic grain size, therefore can not carry out effective grain size grading.
Embodiment 2:
The main chemical compositions mass percent of SAE6150 spring steel wire rod be C:0.48%~0.53%, Si:0.15%~
0.35%, Mn:0.70%~0.90%, Cr:0.80%~1.10%, V:0.15%~0.25%.Specific detection method as follows into
Row:
(1) sample is heat-treated: SAE6150 spring steel wire rod sample is put into resistance furnace, it is small in 850~870 DEG C of heated at constant temperature 1
When, it then quickly removes in cold water of quenching；
(2) sample preparation: sample of the interception by quenching is inlayed with inlay and metallographic specimen is made；
(3) grind away: the metallographic specimen made is roughly ground with polished machine, fine grinding and polishing；
(4) it prepares corrosion reagent: pouring into 100ml water to beaker, with 50~55 DEG C of constant temperature are heated in thermostat water bath, then use
Tweezers are continuously added picric acid and are stirred continuously solution with glass bar, contain not molten picric acid until being formed in the visible solution of naked eyes
Then the supersaturated bitter taste aqueous acid of crystal grain adds the white cat board dish washing liquid of 9~10ml, with 1~2 point of glass bar agitating solution
Clock keeps solution composition, temperature uniform；
(5) etch: polished SAE6150 metallographic specimen polishing is immersed in corrosive agent up, is stirred continuously solution, etch
7~8 minutes, then sample is taken out, is rinsed with water specimen surface, and with velvet polishing cloth gently wipe remove specimen surface it is anti-
Product is answered, then with washes of absolute alcohol and is dried up；
(6) grain size is graded: being graded under metallographic microscope to SAE6150 spring steel wire rod autstenitic grain size.
The SAE6150 spring steel wire rod autstenitic grain size observed under metallographic microscope is as shown in Figure 3.As can be seen that
In 50~55 DEG C of constant temperature corrosion display SAE6150 spring steel wire rod autstenitic grain sizes, sample Austria can with full apparent be shown
Family name's body grain size carries out grain size grading using comparison method according to GB/T6394-2002 " metal mean grain size measuring method ",
Grain size number is 9.5 grades.
Embodiment 3:
The main chemical compositions mass percent of SAE6150 spring steel wire rod be C:0.48%~0.53%, Si:0.15%~
0.35%, Mn:0.70%~0.90%, Cr:0.80%~1.10%, V:0.15%~0.25%.Specific detection method as follows into
Row:
(1) sample is heat-treated: SAE6150 spring steel wire rod sample is put into resistance furnace, it is small in 850~870 DEG C of heated at constant temperature 1
When, it then quickly removes in cold water of quenching；
(2) sample preparation: sample of the interception by quenching is inlayed with inlay and metallographic specimen is made；
(3) grind away: the metallographic specimen made is roughly ground with polished machine, fine grinding and polishing；
(4) it prepares corrosion reagent: pouring into 100ml water to beaker, with 70~75 DEG C of constant temperature are heated in thermostat water bath, then use
Tweezers are continuously added picric acid and are stirred continuously solution with glass bar, contain not molten picric acid until being formed in the visible solution of naked eyes
Then the supersaturated bitter taste aqueous acid of crystal grain adds the white cat board dish washing liquid of 9~10ml, with 1~2 point of glass bar agitating solution
Clock keeps solution composition, temperature uniform；
(5) etch: polished SAE6150 metallographic specimen polishing is immersed in corrosive agent up, is stirred continuously solution, etch
7~8 minutes, then sample is taken out, is rinsed with water specimen surface, and with velvet polishing cloth gently wipe remove specimen surface it is anti-
Product is answered, then with washes of absolute alcohol and is dried up；
(6) grain size is graded: being graded under metallographic microscope to SAE6150 spring steel wire rod autstenitic grain size.
The SAE6150 spring steel wire rod autstenitic grain size observed under metallographic microscope is as shown in Figure 4.As can be seen that
It, can be than more fully showing sample Austria in 70~75 DEG C of constant temperature corrosion display SAE6150 spring steel wire rod autstenitic grain sizes
Family name's body grain size, but also corrode matrix out simultaneously, grain size grading is had some impact on, according to GB/T6394-2002
" metal mean grain size measuring method " carries out grain size grading using comparison method, and grain size number is 9.5 grades.
In conclusion using the method for the present invention in 50~55 DEG C of constant temperature corrosion display SAE6150 spring steel wire rod austenites
Grain size can show to full apparent SAE6150 sample austenite grain boundary, solve prior art to SAE6150
In the detection of spring steel wire rod autstenitic grain size the austenite grain boundary that occurs show it is unintelligible lead to not the problem of effectively grading,
It is created condition to accurately assess SAE6150 spring steel wire rod autstenitic grain size.
Claims (5)
1. a kind of SAE6150 spring steel wire rod autstenitic grain size detection method, it is characterised in that steps are as follows:
(1) sample is heat-treated: SAE6150 spring steel wire rod sample is put into resistance furnace, it is small in 850~870 DEG C of heated at constant temperature 1
When, it then quickly removes in cold water of quenching；
(2) sample preparation: sample of the interception by quenching is inlayed with inlay and metallographic specimen is made；
(3) grind away: the metallographic specimen made is roughly ground with polished machine, fine grinding and polishing；
(4) it prepares corrosion reagent: pouring into 100ml water to beaker, with 50~55 DEG C of constant temperature are heated in thermostat water bath, then use
Tweezers are continuously added picric acid and are stirred continuously solution with glass bar, contain not molten picric acid until being formed in the visible solution of naked eyes
Then the supersaturated bitter taste aqueous acid of crystal grain adds the white cat board dish washing liquid of 9~10ml, with 1~2 point of glass bar agitating solution
Clock keeps solution composition, temperature uniform；
(5) etch: polished SAE6150 metallographic specimen polishing is immersed in corrosive agent up, is stirred continuously solution, etch
7~8 minutes, then sample is taken out, is rinsed with water specimen surface, and with velvet polishing cloth gently wipe remove specimen surface it is anti-
Product is answered, then with washes of absolute alcohol and is dried up；
(6) grain size is graded: being graded under metallographic microscope to SAE6150 spring steel wire rod autstenitic grain size.
2. SAE6150 spring steel wire rod autstenitic grain size detection method as described in claim 1, it is characterised in that: step (1)
In, it is 850~870 DEG C that sample, which is heat-treated heating temperature, and the heated at constant temperature time is 1 hour, and it is cold for quenching the cooling medium used
Water.
3. SAE6150 spring steel wire rod autstenitic grain size detection method as described in claim 1, it is characterised in that: step (4)
In, corrosive agent preparation is to be continuously added picric acid after 100ml water is heated to 50~55 DEG C of constant temperature, then with tweezers, while using glass
Glass stick is stirred continuously solution, until it is water-soluble to form the supersaturated picric acid containing not molten picric acid crystal grain in the visible solution of naked eyes
Then liquid adds the white cat board dish washing liquid of 9~10ml, being stirred 1~2 minute with glass bar keeps solution composition, temperature uniform.
4. SAE6150 spring steel wire rod autstenitic grain size detection method as described in claim 1, it is characterised in that: step (4)
In, the white cat board dish washing liquid is that 500g fills Shanghai White cat board dish washing liquid, the dodecyl sulphur for being 1~3% containing mass percent
Sour sodium.
5. SAE6150 spring steel wire rod autstenitic grain size detection method as described in claim 1, it is characterised in that: step (5)
In, sample etch is that polishing is immersed in corrosive agent up, it is stirred continuously solution, etch 7~8 minutes.
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| CN113504093A (en) * | 2021-07-09 | 2021-10-15 | 大冶特殊钢有限公司 | Grain size display method for alloy containing cobalt element not easy to corrode |
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