Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
  • G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/20—Metals
  • G01N33/202—Constituents thereof
  • G01N33/2028—Metallic constituents
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
  • G01N33/20—Metals
  • G01N33/204—Structure thereof, e.g. crystal structure

Definitions

• the present invention detects the amount of pearlite deposited on spheroidal graphite lead iron having a mixed structure of bainite and residual austenite, and detects the bainite transformation temperature. It is related to the method of determining the material quality of spheroidal graphite lead iron by detecting the mechanical properties. Background technology
• Spheroidal graphite lead iron products with a mixed structure of fine grain and residual austenite have a tensile strength of 100 / 3 ⁇ 4 f Z and a tensile strength of 2 or more and an elongation of 10% or more. In recent years, it has been noted that high strength and high toughness are high.
• This spheroidal graphite lead iron is often used as a so-called important safety component such as foot parts of automobiles, etc. It will have a tremendous effect, such as the reduction of damage and the reduction of raw materials.
• the mechanical properties are remarkably deteriorated, and the tensile strength is 9 6 1 ⁇ 2 and the elongation is 10% when the parallels are not precipitated.
• 46% of the pellets were deposited.
• the tensile strength is 65 ft / fflH and the elongation drops to 4% ife ⁇ .
• the judgment based on hardness is not very reliable because even if the parley is precipitated, it does not change significantly, and if it is deposited on the surface layer of the wrought ⁇ 3 ⁇ 4, the surface folds are judged by a microscope. It is possible, but it is impossible at first to discriminate non-destructive deposits in the center by non-destructive inspection.
• the austempered spheroidal graphite lead iron can obtain desired mechanical properties by changing its isothermal transformation treatment temperature. On the other hand, it is always necessary to strictly control the isothermal transformation process temperature.
• the desired mechanical properties were not obtained due to the sterilized spheroidal graphite lead iron that was precipitated due to the precipitation of the ferrite or the isothermal transformation treatment outside the specified temperature. This is because there was a strong demand for the development of a method for discriminating between.
• the magnetizing coil and the detecting coil are arranged opposite to the bell-shaped compensator, and the steel material is carried by the conveyer.
• the mechanism for determining the hardness of the steel material by the fact that the steel material passes through both coils is disclosed, and the hardness measurement principle of this device is the same as that in the tissue. It is also possible to measure the hardness by utilizing the difference in the magnetic characteristics due to the difference in the ratio of the erase.
• the purpose of the present invention is to determine the amount of pearlite precipitation and / or the mechanical properties of a spheroidal graphite lead iron product having a mixed composition of a fine powder and a residual stainless steel. It also provides a method for determining the material quality of spheroidal graphite lead iron products that can be destructively and easily detected with high reliability.
• the matrix structure of spheroidal graphite lead iron In order to make the matrix structure of spheroidal graphite lead iron a mixed structure of the vanadium and the residual austenite, it is usually from the temperature at which the austenite is the austenite single phase.
• a temper-aging treatment is performed by quenching to a normal temperature transformation temperature range and holding it for a certain period of time.
• Figure 1 shows a continuous cooling curve model of spheroidal graphite lead, and as the cooling curve of the target product is shown in (1), the base structure must be determined if it crosses the parallel nose. It has a two-phase mixed structure consisting of a solid and a residual austenite. However, in the case of crossing the parallel noise as in the case of (2), in addition to the database and the residual talent organization, the Due to the precipitation of the Li structure, the mechanical properties are remarkably deteriorated.
• the bainite structure here is a coin-free ferrite (hi) without precipitation of cementite ( ⁇ 3 C).
• the organization is a folder ( ⁇ ) And two-phase mixture (F e 3 C), the magnetic properties of the case where precipitation of the pearlite was observed and the case where it was not observed ( C where Q is the difference that appears in the
• Figure 2 shows that the base is a spheroidal graphite slag iron (A) with a composite structure of fine grained and residual austenite (A), and spheroidal graphite slag iron (19%) with precipitated pearlite grains ( B), and the hysteresis curve of spheroidal graphite lead iron (C) on which 4 3% of the precipitates have precipitated, and when the precipitates of the precipitates are as in the case of , The shape of the hysteresis curve is higher than that of the case without precipitation.
• A spheroidal graphite slag iron
• A composite structure of fine grained and residual austenite
• B spheroidal graphite slag iron (19%) with precipitated pearlite grains
• C hysteresis curve of spheroidal graphite lead iron
• Fig. 3 shows the amount of porous precipitation and the coercive force
• Fig. 2 (5)] shows the relationship between the amount of parallel precipitation and the saturated magnetic flux density [(3) in Fig. 2]
• Fig. 5 shows the amount of parallel precipitation.
• the magnetic characteristics show a difference. It is possible to determine the temperature of the isothermal transformation process by measuring the shape of the hysteresis curve at the time of the precipitation of the parasite and Zhou-sama, and of course in Fig. 2 (3) ( 4) It is possible to determine the isothermal transformation treatment temperature by measuring a certain value on a hysteresis curve such as that shown in (5).
• Fig. 6 shows the isothermal transformation temperature and coercive force ((5) 'in Fig. 2), saturation magnetic flux density ((3) in Fig. 2), and residual magnetic flux density ((4) in Fig. 2). That is the reason why we have studied the relationship between about
• Fig. 1 shows the continuous cooling curve
• Fig. 2 shows the hysteresis curve
• Fig. 3 shows the relationship between the amount of deposited particles and coercive force
• Fig. 4 shows the amount of deposited particles and saturation flux.
• Fig. 5 shows the relationship between density
• Fig. 5 shows the relationship between the amount of precipitation of perilla and the residual magnetic flux density
• Fig. 6 shows the relationship between isothermal transformation temperature and magnetic properties
• Fig. 7 and Fig. 7 Fig. 8 and Fig. 8 are micrographs showing the metal iridescence
• Fig. 9 is a two-quadrant diagram of the hysteresis curve
• Fig. 10 is the isothermal transformation treatment temperature and mechanical properties and apparent residuals.
• the relationship between magnetic flux and Fig. 11 shows the relationship between apparent residual magnetic flux and mechanical properties.
• the above sample was aged at 850 ° C and held at this temperature for 1 hour, then cooled to 375 for about 2 minutes, held at this temperature for 1 hour, and then water-cooled. It was
• Figures 7 and 8 show microscopically assembled micrographs of the samples that had been subjected to the above-mentioned ripening treatments (i) and (M), respectively.
• the demagnetizing field determined by the shape of the sample affects the demagnetizing field, as shown in Fig. 9, I 1 (. H) / N.
• ⁇ Magnetization strength (G),.: Permeability, .H: Magnetic field strength (O e), N Demagnetizing field coefficient of sample ⁇ , and equivalent to ab point of hysteresis curve
• the residual magnetism is the apparent residual magnetic flux of the sample that corresponds to the residual magnetism of.
• the number of turns of the magnetizing coil is 10, the energizing current is 2.5 KA
• Figure 10 shows the relationship between the isothermal transformation temperature, mechanical properties, and apparent residual magnetic flux for each of these 11 types of samples.
• the relationship between apparent residual magnetic flux and tensile strength, and the relationship between apparent residual magnetic flux and elongation are shown in Fig. 1 "I.
• the residual magnetic flux was 0.96 ... and 0 with the apparent residual magnetic flux in both tensile strength and elongation, as shown in Fig. 11 measured by the above-mentioned Example 1 and the frequency division method. .9 2 which has a good correlation coefficient.
• the spherical graphite of the present invention can be obtained.
• the method of determining the material quality of silver iron is that it can detect non-destructively, easily, and with high sensitivity the pearlite prayed on the spheroidal graphite silver iron having a mixed structure of Paynai and retained austenite. Moreover, the tensile strength and elongation of the material can also be detected.

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• Chemical Kinetics & Catalysis (AREA)
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• Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

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• 1985
  • 1985-04-22 DE DE19853590683 patent/DE3590683T1/de not_active Ceased
  • 1985-04-22 WO PCT/JP1985/000224 patent/WO1986006485A1/ja active Application Filing
• 1986
  • 1986-04-22 CH CH5071/86A patent/CH670159A5/de not_active IP Right Cessation

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