CN109916693A - A kind of method of determining casting single crystal high temperature alloy crystal orientation - Google Patents
A kind of method of determining casting single crystal high temperature alloy crystal orientation Download PDFInfo
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Abstract
A kind of method of determining casting single crystal high temperature alloy crystal orientation, when crystal is grown with dendritic morphology, the primary tiller chip of crystal is to parallel with<001>direction, secondary dendrite direction is parallel with<010>or<100>direction, therefore can determine its crystal orientation according to the dendritic growth direction of casting single crystal high temperature alloy.The present invention is based on crystal growth directions, and there are stringent corresponding relationships with crystallographic direction, and analyze the distribution of dendritic feature during dendritic growth, crystal orientation is determined directly on casting single crystal coupon by the way of metallographic observation and directional cutting, determining crystal orientation precision deviates less than 1 degree, has the characteristics that simple and practical.
Description
Technical field
The present invention relates to casting single crystal high temperature alloy crystal orientations to measure field, specifically a kind of by metallographic observation and fixed
To the method for cutting determining casting single crystal high temperature alloy crystal orientation.
Background technique
In order to improve the temperature capability and service life of aero-engine single crystal turbine blade, need to take using with expectation
To single crystal super alloy accurately control as seed crystal the crystal orientation of single crystal super alloy turbo blade.In industrial production, seed
Brilliant usually orient on the casting single crystal high temperature alloy coupon of spiral crystal separation method preparation cuts.Before cutting seed crystal, it is necessary first to
Determine the crystal orientation of casting single crystal high temperature alloy coupon.
The method of existing measurement crystal orientation, such as rotational x-ray diffraction approach, electron backscatter diffraction crystal orientation measurement etc.
The sample size of method measurement is smaller, and the crystal orientation of measurement casting single crystal high temperature alloy coupon makes that directional cutting first is needed to go out
One small sample determines small sample crystal orientation by X-ray diffractometer or EBSD, and then the crystal orientation of measurement is restored
Onto monocrystalline coupon, and it cannot directly measure the crystal orientation of casting single crystal coupon.These methods need the device is complicated and
Valuableness, operating procedure is more, is easy to produce error during reduction bulky single crystal crystal orientation.Academic dissertation " nickel-based monocrystal high temperature
Alloy turbine bucket platform stray crystal Study of Defects " in propose using observation metallographic structure and demarcated using longitudinally cutting method
The technology of monocrystalline coupon crystal orientation, but this technology only can determine on a small quantity have primary tiller chip to, a certain secondary dendrite
The direction situation parallel with the plane that axial three directions of sample form two-by-two, then have no way to most not parallel situations
Demarcate its crystal orientation.
Summary of the invention
In order to overcome the prior art to determine expensive, the indirect determination using the device is complicated of casting single crystal high temperature alloy crystal orientation
Casting single crystal coupon crystal orientation, and existing metallographic adds vertical face cutting method not can determine that most monocrystalline coupon crystal orientations
Deficiency, the invention proposes a kind of sides that casting single crystal coupon crystal orientation is directly determined by metallographic observation and directional cutting
Method.
Of the invention comprises the concrete steps that:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Metallographic chemistry corrosion is carried out to the end face,
It is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to the side of secondary dendrite
To, and measure obtain each interdendritic away from average value.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, and cut surface is made to be parallel to a mark line, obtained
Primary calibration test specimen.Specifically:
Using Wire EDM, along the axially cutting monocrystalline coupon of the monocrystalline coupon, and cut surface is made to be parallel to institute
A mark line is stated, and the cut surface deviates the center line of the monocrystalline coupon, makes the cut surface to the distance of one side edge
Less than the cut surface to the distance of another side edge.
The primary calibration test specimen is the more than half cylindrical body for cutting monocrystalline coupon and obtaining；Cutting on primary calibration test specimen
Face is vertical section.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
If a single dendrite do on the vertical section average length of exposure be averaged an interdendritic away from ratio it is big
In 60, then third step is gone to.
If a single dendrite do on the vertical section average length of exposure be averaged an interdendritic away from ratio it is small
In 60, then in vertical section, scribing line is used as secondary mark line, and is parallel to the secondary mark line and appears primary on the vertical section
The direction of dendrite.Test specimen is once demarcated in parallel wire cutting along the secondary mark line, and makes cut direction perpendicular to vertical section,
Obtain secondary calibration test specimen.Specifically:
Using Wire EDM, test specimen is demarcated along the parallel lines direction cutting of secondary mark line on vertical section is primary,
And keep cut direction vertical with vertical section, the oblique profile perpendicular to vertical section is formed on once calibration test specimen.
The secondary calibration test specimen is the oblique semicylinder that the primary calibration test specimen of cutting obtains.
To oblique profile on secondary calibration test specimen carry out standard gold phase processor, and chemical attack goes to third step.
Step 3, crystal orientation is demarcated
If in second step a single dendrite do on the vertical section exposure average length and an average interdendritic away from
Ratio be greater than 60, then vertical section scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller
Chip to.Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on vertical section and makes<010>
Or<100>bearing mark line, should<010>or<100>bearing mark line perpendicular to primary tiller chip to.This<010>or<100>side
It is monocrystalline<010>or<100>direction to direction shown in mark line.
If in second step a single dendrite do on the vertical section exposure average length and an average interdendritic away from
Ratio less than 60, then oblique profile scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller
Chip to.Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on oblique profile and makes<010>
Or<100>bearing mark line, should<010>or<100>bearing mark line perpendicular to primary tiller chip to.This<010>or<100>side
It is monocrystalline<010>or<100>direction to direction shown in mark line.
The present invention directly determines crystal orientation on casting single crystal coupon by the way of metallographic observation and directional cutting,
With using equipment and operating procedure simple, the characteristics of determining crystal orientation precision deviates less than 1 degree.
Fig. 1 is the relationship between dimensionless direction of growth Φ/θ and withdrawing rate, it can be seen that when crystal is with dendritic morphology
When growth, to parallel with<001>direction, secondary dendrite direction is parallel with<010>or<100>direction for the primary tiller chip of crystal,
Therefore its crystal orientation can be determined according to the dendritic growth direction of casting single crystal high temperature alloy.The present invention is based on crystal growth sides
To there are stringent corresponding relationships with crystallographic direction, and analyze the distribution of dendritic feature during dendritic growth, discovery by into
Row structure observation and along secondary dendrite direction carry out limited times directional cutting can obtain it is flat where a dendritic growth
Face, and then in the crystal orientation for determining monocrystalline in the plane.Metallographic is made on monocrystalline coupon cross section, observes cross section group
It knits, and marks secondary dendrite direction, as shown in Figure 2.Coupon axis, which is parallel to, along label orientation later is cut into a vertical profile
Face, vertical profile covering weave interrupt phenomenon without dendrite, and the length of single dendrite exposure on vertical section is greater than monocrystalline coupon height,
Therefore crystal orientation can be determined on this vertical section, as shown in Figure 3.If dendrite is frequently interrupted on vertical section, single one
The length of secondary dendrite exposure on vertical section is shorter, as shown in figure 4, then perpendicular to vertical section and need to also be parallel to one on vertical section
Secondary dendrite direction is cutting out new oblique profile, obtains similar to solidified structure figure shown in Fig. 3, on the oblique profile newly cut out herein really
Determine the crystal orientation of coupon.
Detailed description of the invention
Relationship of the Fig. 1 between dimensionless direction of growth Φ/θ and withdrawing rate.
Fig. 2 is monocrystalline coupon vertical profile covering weave, and straight line is the secondary dendrite direction of label in figure.
Dendrite is dry in Fig. 3 vertical profile covering weave does not interrupt phenomenon, and dendrite of monocrystalline does the length of the exposure on vertical section
Greater than monocrystalline coupon height, single arrow direction dendritic growth direction, i.e.<001>direction in figure, double-head arrow direction be<010>or<
100 > direction.
It can be found that dendrite is dry to be interrupted phenomenon appearance in Fig. 4 vertical profile covering weave, a single dendrite is sudden and violent on vertical section
The length of dew is shorter.
Fig. 5 is flow chart of the invention.In figure:
1 is monocrystalline coupon one end metallographic schematic diagram, and 2 be a mark line, and 3 be primary calibration test specimen, and 4 be<001>direction
Mark line, 5 be<010>or<100>bearing mark line, and 6 be secondary mark line, and 7 be starting point, and 8 be terminal, and 9 be secondary calibration
Test specimen.
Specific embodiment
Embodiment 1
The present embodiment is the crystal orientation for determining the Ni-based cast single crystal super alloy of diameter a 8mm, long 15mm.
The nickel-base high-temperature single crystal alloy is made of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, in which: alloying component
Be Cr be 3.2%, Mo 1.2%, Al 6%, Co 10%, W 6%, Re 4%, Ta 7.98%, Hf 0.008%,
C≤0.02%, remaining is Ni.The percentage is mass percent.
The detailed process of the present embodiment is:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Metallographic is carried out to the end face according to a conventional method
Chemical attack is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to two
The direction of secondary dendrite, and measure obtain each interdendritic away from average value be 201 μm.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained, and keeps vertical section flat
Row obtains once demarcating test specimen in a mark line.The primary calibration test specimen is the column that cross section is large semi-circular
Body.
When cutting, using electric spark wire cutting method, the axially cutting monocrystalline coupon is formed in parallel with the monocrystalline coupon
The vertical section of axis, and the center line of the monocrystalline coupon is deviateed in the vertical section, even if the vertical section is away from the monocrystalline coupon one
The distance of side edge is less than at a distance from the vertical section to another side edge parallel with it.In the present embodiment, the cutting line with
The distance of the monocrystalline coupon one side edge is 2mm, and the distance of another side edge is 6mm.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
In the present embodiment, the metallographic structure in the vertical section show a single dendrite do manifested on this vertical section it is flat
Equal length is greater than 13mm.A single dendrite do on the vertical section average length of exposure be averaged an interdendritic away from ratio
Value is greater than 60, enters step 3.
Step 3, crystal orientation is demarcated
Vertical section scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to.
Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on vertical section and makes<010>direction sign
Remember line, should<010>bearing mark line perpendicular to primary tiller chip to.Direction shown in this<010>bearing mark line be monocrystalline<
010 > direction.
Embodiment 2
The present embodiment is the crystal orientation for determining the Ni-based cast single crystal super alloy of diameter a 16mm, long 30mm.
The nickel-base high-temperature single crystal alloy is made of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, in which: alloying component
Be Cr be 3.2%, Mo 1.2%, Al 6%, Co 10%, W 6%, Re 4%, Ta 7.98%, Hf 0.008%,
C≤0.02%, remaining is Ni.The percentage is mass percent.The detailed process of the present embodiment is:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Gold is carried out to the end face using conventional method
Phase chemical attack is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to
The direction of secondary dendrite, and measure obtain each interdendritic away from average value be 325 μm.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained, and keeps vertical section flat
Row obtains once demarcating test specimen in a mark line.The primary calibration test specimen is the column that cross section is large semi-circular
Body.Specifically:
When cutting, using electric spark wire cutting method, the axially cutting monocrystalline coupon is formed in parallel with the monocrystalline coupon
The vertical section of axis, and the center line of the monocrystalline coupon is deviateed in the vertical section, even if the vertical section is away from the monocrystalline coupon one
The distance of side edge is less than at a distance from the vertical section to another side edge parallel with it.In the present embodiment, the cutting line with
The distance of the monocrystalline coupon one side edge is 1.5mm, and the distance of another side edge is 14.5mm.
The primary calibration test specimen is the more than half cylindrical body vertical section cutting monocrystalline coupon and obtaining.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
In the present embodiment, the metallographic structure in the vertical section show a single dendrite do manifested on this vertical section it is flat
Equal length is greater than 25mm.A single dendrite do on the vertical section average length of exposure be averaged an interdendritic away from ratio
Value is greater than 60, enters step.
Step 3, crystal orientation is demarcated
Vertical section scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to.
Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on vertical section and makes<100>direction sign
Remember line, should<100>bearing mark line perpendicular to primary tiller chip to.Direction shown in this<100>bearing mark line be monocrystalline<
100 > direction.
Embodiment 3
The present embodiment is the crystal orientation for determining the Ni-based cast single crystal super alloy of diameter a 20mm, long 30mm.
The nickel-base high-temperature single crystal alloy is made of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, in which: alloying component
Be Cr be 3%, Mo 1%, Al 6%, Co 12%, W 6%, Re 4%, Ta 7.95%, Hf 1%, C≤
0.02%, remaining is Ni.The percentage is mass percent.
The detailed process of the present embodiment is:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Metallographic chemistry corrosion is carried out to the end face,
It is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to the side of secondary dendrite
To, and measure obtain each interdendritic away from average value be 289 μm.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained, and make the vertical section
It is parallel to a mark line, obtains once demarcating test specimen.The primary calibration test specimen is that cross section is large semi-circular
Cylinder.Specifically:
When cutting, using electric spark wire cutting method, the vertical section of the monocrystalline coupon is obtained, and institute is deviateed in the vertical section
The center line of monocrystalline coupon is stated, even if distance of the vertical section away from the monocrystalline coupon one side edge is less than with the vertical section to therewith
The distance of parallel another side edge.In the present embodiment, which is 1mm at a distance from the monocrystalline coupon one side edge, separately
The distance of one side edge is 19mm.
The primary calibration test specimen is the more than half cylindrical body for cutting monocrystalline coupon and obtaining；Cutting on primary calibration test specimen
Face is vertical section.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
In the present embodiment, the metallographic structure in the vertical section show a single dendrite do manifested on this vertical section it is flat
Equal length is less than 17.8mm.A single dendrite do on the vertical section exposure average length and an average interdendritic away from
Ratio is less than 60.
When the ratio is less than 60, continues to cut the primary calibration test specimen, obtain secondary calibration test specimen, specifically
Process is that in vertical section, scribing line is used as secondary mark line, and is parallel to the secondary mark line and appears primary on the vertical section
The direction of dendrite.Test specimen is once demarcated in parallel wire cutting along the secondary mark line, is formed and is hung down on the primary calibration test specimen
Directly in the oblique profile in vertical section, secondary calibration test specimen is obtained.The secondary calibration test specimen is the semicylinder with oblique profile.
Oblique profile is 25mm at a distance from the starting point 7 on once calibration test specimen is between terminal 8 in the present embodiment.
The secondary calibration test specimen is the oblique semicylinder that the primary calibration test specimen of cutting obtains.
To oblique profile on secondary calibration test specimen carry out standard gold phase processor, and chemical attack goes to third step.
Step 3, crystal orientation is demarcated
Oblique profile scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to.
Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on oblique profile and makes<010>direction sign
Remember line, should<010>bearing mark line perpendicular to primary tiller chip to.Direction shown in this<010>bearing mark line be monocrystalline<
010 > direction.
Embodiment 4
The present embodiment is the crystal orientation for determining the Ni-based cast single crystal super alloy of diameter a 25mm, long 50mm.
The nickel-base high-temperature single crystal alloy is made of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, in which: alloying component
Be Cr be 3%, Mo 1%, Al 6%, Co 11.6%, W 6.3%, Re 4.1%, Ta 7.95%, Hf 1%, C
≤ 0.02%, remaining is Ni.The percentage is mass percent.
The detailed process of the present embodiment is:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Metallographic is carried out to the end face according to a conventional method
Chemical attack is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to two
The direction of secondary dendrite, and measure obtain each interdendritic away from average value be 156 μm.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained, and make the vertical section
It is parallel to a mark line, obtains once demarcating test specimen.The primary calibration test specimen is that cross section is large semi-circular
Cylinder.Specifically:
When cutting, using electric spark wire cutting method, the axially cutting monocrystalline coupon is formed in parallel with the monocrystalline coupon
The vertical section of axis, and the center line of the monocrystalline coupon is deviateed in the vertical section, even if the vertical section is away from the monocrystalline coupon one
The distance of side edge is less than at a distance from the vertical section to another side edge parallel with it.In the present embodiment, the cutting line with
The distance of the monocrystalline coupon one side edge is 1mm, and the distance of another side edge is 24mm.
The primary calibration test specimen is the more than half cylindrical body for cutting monocrystalline coupon and obtaining.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
In the present embodiment, the metallographic structure in the vertical section show a single dendrite do manifested on this vertical section it is flat
Equal length is less than 9mm.A single dendrite do on the vertical section average length of exposure be averaged an interdendritic away from ratio
Value is less than 60.
When the ratio is less than 60, continues to cut the primary calibration test specimen, obtain secondary calibration test specimen, specifically
Process is that in vertical section, scribing line is used as secondary mark line, and is parallel to the secondary mark line and appears primary on the vertical section
The direction of dendrite.Test specimen is once demarcated in parallel wire cutting along the secondary mark line, is formed and is hung down on the primary calibration test specimen
Directly in the oblique profile in vertical section, secondary calibration test specimen is obtained.The secondary calibration test specimen is the semicylinder with oblique profile.
Oblique profile is 10mm at a distance from the starting point 7 on once calibration test specimen is between terminal 8 in the present embodiment.
Metallographic processing, and chemical attack are carried out to the oblique profile obtained on secondary calibration test specimen.
Step 3, crystal orientation is demarcated
Oblique profile scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to.
Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on oblique profile and makes<100>direction sign
Remember line, should<100>bearing mark line perpendicular to primary tiller chip to.Direction shown in this<100>bearing mark line be monocrystalline<
100 > direction.
Embodiment 5
The present embodiment is the crystal orientation for determining the Ni-based cast single crystal super alloy of diameter a 9mm, long 30mm.
The nickel-base high-temperature single crystal alloy is made of Cr, Mo, Al, Co, W, Re, Ta, Hf, C and Ni, in which: alloying component
Be Cr be 3%, Mo 1%, Al 6%, Co 11.6%, W 6.3%, Re 1.5%, Ta 6%, Hf 0.01%, C
≤ 0.02%, remaining is Ni.The percentage is mass percent.
The detailed process of the present embodiment is:
Step 1, a mark line parallel with secondary dendrite direction is done
Using an end face of standard metallographic preparation step grinding and polishing monocrystalline coupon.Metallographic is carried out to the end face according to a conventional method
Chemical attack is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to two
The direction of secondary dendrite, and measure obtain each interdendritic away from average value be 236 μm.
Step 2, monocrystalline coupon is cut
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained, and make the vertical section
It is parallel to a mark line, obtains once demarcating test specimen.The primary calibration test specimen is that cross section is large semi-circular
Cylinder.Specifically:
When cutting, using electric spark wire cutting method, the axially cutting monocrystalline coupon is formed in parallel with the monocrystalline coupon
The vertical section of axis, and the center line of the monocrystalline coupon is deviateed in the vertical section, even if the vertical section is away from the monocrystalline coupon one
The distance of side edge is less than at a distance from the vertical section to another side edge parallel with it.In the present embodiment, the cutting line with
The distance of the monocrystalline coupon one side edge is 2.5mm, and the distance of another side edge is 6.5mm.
The primary calibration test specimen is the more than half cylindrical body for cutting monocrystalline coupon and obtaining.
Standard gold phase processor, and chemical attack are carried out to the vertical section of the primary calibration test specimen.Observe the vertical section
Metallographic structure measures the average length that a single dendrite does the exposure on the vertical section.
In the present embodiment, the metallographic structure in the vertical section show a single dendrite do manifested on this vertical section it is flat
Equal length is less than 13.5mm.A single dendrite do on the vertical section exposure average length and an average interdendritic away from
Ratio is less than 60.
When the ratio is less than 60, continues to cut the primary calibration test specimen, obtain secondary calibration test specimen, specifically
Process is that in vertical section, scribing line is used as secondary mark line, and is parallel to the secondary mark line and appears primary on the vertical section
The direction of dendrite.Test specimen is once demarcated in parallel wire cutting along the secondary mark line, is formed and is hung down on the primary calibration test specimen
Directly in the oblique profile in vertical section, secondary calibration test specimen is obtained.The secondary calibration test specimen is the semicylinder with oblique profile.
Oblique profile is 15mm at a distance from the starting point 7 on once calibration test specimen is between terminal 8 in the present embodiment.
Metallographic processing, and chemical attack are carried out to the oblique profile obtained on secondary calibration test specimen.
Step 3, crystal orientation is demarcated
Oblique profile scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to.
Direction shown in this<001>bearing mark line is monocrystalline<001>direction.Continue scribing line on oblique profile and makes<010>direction sign
Remember line, should<010>bearing mark line perpendicular to primary tiller chip to.Direction shown in this<010>bearing mark line be monocrystalline<
010 > direction.
Claims (4)
1. a kind of method of determining casting single crystal high temperature alloy crystal orientation, which is characterized in that
Detailed process is:
Step 1, a mark line parallel with secondary dendrite direction is done:
It is used as a mark line in the monocrystalline coupon end face scribing line by metallographic chemistry corrosion, which is parallel to secondary dendrite
Direction；It is described by metallographic chemistry corrosion monocrystalline coupon end face each interdendritic away from average value be 156 μm~325
μm；
Step 2, monocrystalline coupon is cut:
Along the axially cutting monocrystalline coupon of the monocrystalline coupon, the vertical section of the monocrystalline coupon is obtained；Deviate institute in the vertical section
It states the center line of monocrystalline coupon and is parallel to a mark line；It obtains once demarcating test specimen；
After carrying out metallographic processing and chemical attack to the vertical section of the primary calibration test specimen, the vertical profile that metallographic structure appears is obtained
Face；
Determine that an average single dendrite does the length manifested on the vertical section and an average dendrite in the vertical section
The ratio of spacing；The ratio is greater than 60 or less than 60；
When the ratio is greater than 60,3 are entered step；
When the ratio is less than 60, continues to cut the primary calibration test specimen, obtain secondary calibration test specimen；
Metallographic processing, and chemical attack are carried out to the oblique profile obtained on secondary calibration test specimen；
Step 3, crystal orientation is demarcated:
When the ratio is greater than 60, in vertical section,<001>bearing mark line is made in scribing line, and it is parallel to be somebody's turn to do<001>bearing mark line
In primary tiller chip to；Direction shown in this<001>bearing mark line is monocrystalline<001>direction；Continue to cross on vertical section
Make<010>or<100>bearing mark line, should<010>or<100>bearing mark line perpendicular to primary tiller chip to；This<010>
Or direction shown in<100>bearing mark line is monocrystalline<010>or<100>direction；When the ratio is less than 60, in oblique profile
Scribing line make<001>bearing mark line, should<001>bearing mark line be parallel to primary tiller chip to；This<001>bearing mark line
Shown direction is monocrystalline<001>direction；Continue scribing line on oblique profile and make<010>or<100>bearing mark line, is somebody's turn to do<010
>or<100>bearing mark line perpendicular to primary tiller chip to；Direction shown in this<010>or<100>bearing mark line is monocrystalline
<010>or<100>direction.
2. determining the method for casting single crystal high temperature alloy crystal orientation as described in claim 1, which is characterized in that in cutting monocrystalline
When coupon, the cut surface deviates the center line of the monocrystalline coupon, is less than the distance of the monocrystalline coupon one side edge another
The distance of side.
3. determining the method for casting single crystal high temperature alloy crystal orientation as claimed in claim 2, which is characterized in that the cut surface
Be 1~2.5mm at a distance from monocrystalline coupon a side edge, the distance at the symmetrical side edge in the other side is 6~24mm.
4. determining the method for casting single crystal high temperature alloy crystal orientation as described in claim 1, which is characterized in that the production two
It is secondary calibration test specimen detailed process be, it is described it is primary calibration test specimen vertical section scribing line be used as secondary mark line, and make this two
Secondary mark line is parallel to the direction of the dendrite appeared on the vertical section；Along the secondary mark line parallel wire cutting this one
Secondary calibration test specimen forms oblique profile on once calibration test specimen, and makes the oblique profile perpendicular to the vertical section；Oblique profile
Starting point and the distance between terminal be 10mm~25mm.
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| CN201910257352.8A Active CN109916693B (en) | 2019-04-01 | 2019-04-01 | Method for determining crystal orientation of cast single crystal superalloy |
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| CN110487788A (en) * | 2019-07-12 | 2019-11-22 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy low-angle boundary formability |
| CN111216258A (en) * | 2020-02-25 | 2020-06-02 | 西北工业大学 | Method for preparing cast single crystal high-temperature alloy seed crystal by cutting |
| CN111308041A (en) * | 2020-04-21 | 2020-06-19 | 江苏金瑞机械制造有限公司 | Detection method for preparing single crystal blade by two-dimensional crystal selection method in 001 orientation optimization |
| CN111638239A (en) * | 2020-05-24 | 2020-09-08 | 西安交通大学 | Supercritical water device capable of observing inorganic salt crystal evolution process in situ |
| CN113073379A (en) * | 2021-03-04 | 2021-07-06 | 贵阳航发精密铸造有限公司 | Seed crystal preparation process for engineering application of seed crystal method growth single crystal blade |
| CN114369874A (en) * | 2021-12-15 | 2022-04-19 | 中国科学院金属研究所 | Method for preparing alloy sample with controllable secondary orientation through 3D printing wax mold |
| CN114850406A (en) * | 2022-04-25 | 2022-08-05 | 安徽应流航源动力科技有限公司 | Preparation process of seed crystal for casting nickel-based single crystal blade with precisely controllable three-dimensional orientation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110487788A (en) * | 2019-07-12 | 2019-11-22 | 中国科学院金属研究所 | A kind of assessment method of single crystal super alloy low-angle boundary formability |
| CN111216258A (en) * | 2020-02-25 | 2020-06-02 | 西北工业大学 | Method for preparing cast single crystal high-temperature alloy seed crystal by cutting |
| CN111216258B (en) * | 2020-02-25 | 2022-04-05 | 西北工业大学 | Method for preparing cast single crystal high-temperature alloy seed crystal by cutting |
| CN111308041A (en) * | 2020-04-21 | 2020-06-19 | 江苏金瑞机械制造有限公司 | Detection method for preparing single crystal blade by two-dimensional crystal selection method in 001 orientation optimization |
| CN111638239A (en) * | 2020-05-24 | 2020-09-08 | 西安交通大学 | Supercritical water device capable of observing inorganic salt crystal evolution process in situ |
| CN113073379A (en) * | 2021-03-04 | 2021-07-06 | 贵阳航发精密铸造有限公司 | Seed crystal preparation process for engineering application of seed crystal method growth single crystal blade |
| CN114369874A (en) * | 2021-12-15 | 2022-04-19 | 中国科学院金属研究所 | Method for preparing alloy sample with controllable secondary orientation through 3D printing wax mold |
| CN114850406A (en) * | 2022-04-25 | 2022-08-05 | 安徽应流航源动力科技有限公司 | Preparation process of seed crystal for casting nickel-based single crystal blade with precisely controllable three-dimensional orientation |
| CN114850406B (en) * | 2022-04-25 | 2023-04-21 | 安徽应流航源动力科技有限公司 | Preparation process of three-dimensional orientation precisely controllable seed crystal for casting nickel-based single crystal blade |
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