CN105606288B - A kind of experimental evaluation method of high-temperature alloy turbine blade military service stress - Google Patents
A kind of experimental evaluation method of high-temperature alloy turbine blade military service stress Download PDFInfo
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- CN105606288B CN105606288B CN201610162676.XA CN201610162676A CN105606288B CN 105606288 B CN105606288 B CN 105606288B CN 201610162676 A CN201610162676 A CN 201610162676A CN 105606288 B CN105606288 B CN 105606288B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
Abstract
The present invention provides a kind of experimental evaluation methods of high-temperature alloy turbine blade military service stress, are related to the experimental evaluation of DZ125 directionally solidified superalloy, DS superalloy turbo blade military service stress.This method has studied the influence of differentiation behavior of the stress intensity to alloy γ ' phase by lasting interrupt experiments, finds certain temperature and under the time, the raft shape degree of perfection of γ ' phase can be improved with the raising of stress.Meanwhile the raft shape degree of perfection for passing through quantization signifying γ ' phase, it is determined that certain temperature and the corresponding relationship under the time between the raft shape degree of perfection of γ ' phase of stress and the dry middle part of dendrite.The average military service stress of blade can be assessed on the basis of assessing service temperature using the relationship and γ ' the phase raft shape degree of perfection of practical military service certain time rear blade.The process eliminate blade coatings and the complex effects of gaseous film control structure, realize the assessment to blade base military service stress, have important engineer application meaning and bright prospects in terms of the military service stress evaluation of DZ125 blade.
Description
Technical field
The invention belongs to Ni-based directionally solidified superalloy, DS superalloy blade technology fields, and in particular to a kind of directional solidification turbine leaf
The experimental evaluation method of piece military service stress.
Background technique
Aero-engine is highly complex and accurate thermal machine, the whirlpool as one of aero-engine most critical component
Rotor blades are the enthalpys of combustion gas and kinetic energy is converted into the important hot-end component of mechanical energy.Since rotor blade is under combustion gas environment
High speed rotation, blade bear the complexing action of mechanical stress and thermal stress for a long time.The stress intensity that each position of blade is born
Have differences, i.e. the stress field of blade is uneven, and the Stress Field Distribution of blade for instructing the material of blade to select, leaf set
It counts and determines that examination point has important directive significance in maintenance process, with significant industrial application value.
Currently, mostly using the side of the numerical simulation calculation based on boundary condition for the research of the Stress Field Distribution of blade
Method there is no the experimental evaluation method based on microstructure.
Nickel-base cast superalloy turbo blade is answered during military service due to being chronically at high-temperature high-pressure fuel gas and complexity
Under the effect of creep caused by power, lesion regression inevitably occurs for blade interior metallurgy.Wherein, since blade itself revolves
Centrifugal stress caused by turning and the thermal stress as caused by high-temperature fuel gas are usually the main stress of blade.Due to stress
Effect, the γ ' of primitive cube shape, which meets, gradually occurs directional coarsening, forms the raft shape tissue of sheet.Simultaneously as γ ' phase
The driving force of raft shape and applied stress are closely related, and with the raising of applied stress, the raft shape degree of perfection of γ ' phase is also gradually complete
Kind and raising.Therefore, the quantitative relationship that raft shape degree of perfection and applied stress are established using experiment, thus complete according to its raft shape
The military service stress of blade is quantitatively evaluated in kind degree.
Summary of the invention
The object of the present invention is to provide a kind of directional solidification DZ125 alloy turbine blade military service stress based on degenerate tissue
Experimental evaluation method.This method can assess the military service stress at each position of DZ125 alloy turbine blade blade, assessment essence
Degree is about 30MPa, is suitble to engineer application.
A kind of experimental evaluation method of high-temperature alloy turbine blade military service stress, core technology main points are as follows: directional solidification
For DZ125 alloy turbine blade during being actually on active service, the γ ' of primitive cube shape, which meets, gradually occurs directional coarsening, forms piece
The raft shape tissue of shape.Stress is the main influence factor of alloy γ ' phase raft shape degree of perfection, and the two has certain corresponding pass
System.Therefore certain temperature and the corresponding relationship under the time between stress and γ ' phase raft shape degree of perfection can be established, to the reality of blade
Border military service stress is assessed.Specific assessment the following steps are included:
1) the creep interrupt experiments of different stress under different temperatures and duration are carried out to turbo blade material DZ125 alloy,
Then the raft shape degree of perfection of a γ ' phase of alloy is counted, obtains stress and a γ ' under different temperatures and duration
The corresponding relationship of phase raft shape degree of perfection.
2) it unites to a γ ' phase raft shape degree of perfection of DZ125 alloy vane a part after practical military service m hours
Meter, obtains a γ ' phase raft shape degree of perfection at the position.
3) on the basis of the position service temperature ranging assessments result, the assessment of average military service stress is carried out, by the portion
γ ' phase raft after carrying out m hours lasting interrupt experiments within the scope of γ ' the phase raft shape degree of perfection and the position service temperature of position
Shape degree of perfection compares, and chooses military service stress of the range of stress as the position corresponding to similar raft shape degree of perfection
Assessment result is to get the military service stress for arriving the position.
The experimental temperature of lasting interrupt experiments under the different temperatures stress of DZ125 alloy described in step 1) be 900 DEG C,
950 DEG C, 1000 DEG C and 1050 DEG C, the experiment range of stress is 0~280MPa；The lasting interrupt experiments duration is no more than blade
Service life, and it is isometric with the practical active time m of blade to be assessed within the scope of the duration.
The degree of perfection of raft shape described in step 2) is according to following publicity:
In formula,Indicate the number of the intersection of raft shape tissue and interruption in the unit length of vertical raft direction,It indicates
It is parallel to the number of the intersection of raft shape tissue and interruption in the unit length of raft direction, Ω γ ' phase raft shape degree of perfection,
Numberical range is 0~1, Ω when being 0, represents equiaxial γ ' phase constitution, i.e., vertical and horizontal direction is equivalent；When Ω is 1,
Ideal raft shape tissue is represented, i.e. γ ' phase raft shape is neither interrupted nor intersected.
It is an advantage of the current invention that having been determined under certain temperature and time by the lasting interrupt experiments for applying different stress
Relationship between stress and γ ' phase raft shape degree of perfection utilizes a γ ' phase of the blade base that the relationship and actual measurement obtain
Raft shape degree of perfection realizes the quantitative evaluation of the military service stress to blade base on the basis of service temperature assessment.With number
Value simulation method is compared, and the process eliminate the probabilistic influences of boundary condition, is averagely on active service in assessment blade base
The precision of stress is about 30MPa.The appraisal procedure is more easy to operate, is suitble to engineer application, in the military service stress of DZ125 alloy vane
There are stronger engineer application meaning and bright prospects in assessment.
Detailed description of the invention
Fig. 1 is the variable cross-section sample scale diagrams for carrying out lasting interrupt experiments.
Fig. 2 is γ ' phase raft shape degree of perfection under different temperatures after DZ125 alloy 300 hours lasting interrupt experiments and is on active service
The corresponding relationship of stress.
Dendrite dry micro- group of place in longitudinal section at leading edge in the middle part of the DZ125 alloy vane blade that Fig. 3 is military service 300 hours
It knits.
Specific embodiment
Following example will be further described the present invention, so as to those skilled in the art more fully understand it is of the invention excellent
Point and feature.
Blade material DZ125 alloy is processed into such as the lasting sample of Fig. 1 variable cross-section, the formation diameter difference on a sample
For 4 kinds of sections of 6mm, 7mm, 8mm and 9mm, four kinds of different stress thus can be formd on a sample, then it is carried out
The lasting interrupt experiments of the different temperatures of 300h.The actual temp and stress eventually formed is respectively as follows: 124MPa at 900 DEG C,
158MPa, 206MPa, 280MPa；98MPa, 124MPa, 162MPa, 220MPa at 950 DEG C；18MPa, 23MPa at 1000 DEG C,
29MPa, 40MPa, 67MPa, 84MPa, 110MPa, 150MPa；18MPa, 23MPa, 29MPa, 40MPa at 1050 DEG C.
Longitudinal section dissection to the sample after above-mentioned lasting interrupt experiments, and the tissue of longitudinal section is observed, then
Utilize the raft shape degree of perfection of following formula statistics γ ' phase:
In formula,Indicate the number of the intersection of raft shape tissue and interruption in the unit length of vertical raft direction,It indicates
It is parallel to the number of the intersection of raft shape tissue and interruption in the unit length of raft direction.The numberical range of Ω is 0~1, Ω 0
When, equiaxial γ ' phase constitution is represented, i.e., vertical and horizontal direction is equivalent；When Ω is 1, ideal raft shape tissue is represented, i.e.,
γ ' phase raft shape is neither interrupted nor is intersected.Ω value indicates that raft shape degree is more perfect closer to 1.According to above-mentioned formula, in raft
Isometric line segment that is vertical and being parallel to raft direction is drawn on shape macrograph.Then line segment of the measurement perpendicular to raft shape direction
With the intersection point number of γ/γ ' phase interface, it is denoted asMeasurement is parallel to the line segment in raft shape direction and the intersection point of γ/γ ' phase interface
Number is denoted asRaft shape degree of perfection Ω is finally calculated according to formula.For same position, it is proposed that choose 5 or more
Raft shape macrograph is measured and is calculated, and obtains Ω average value and standard deviation.
The raft shape degree of perfection organized after persistently interrupting to 300h under 900~1050 DEG C of different stress counts, thus
The relationship in 300h under certain temperature between stress and the raft shape degree of perfection of γ ' phase is established, as shown in Figure 2.
To γ ' the phase raft shape degree of perfection of a part in the middle part of DZ125 alloy vane blade after the 300h that is actually on active service shown in Fig. 3
Quantitative statistics are carried out, obtaining its raft shape degree of perfection (Ω) is 0.29.Since the service temperature at the position is 1000~1050 DEG C,
The relationship of stress and raft shape degree of perfection at 1000~1050 DEG C in the raft shape degree of perfection at the position and Fig. 1 is carried out pair
Than obtaining its military service stress is 34~62MPa.Therefore, it on the basis of assessing temperature, realizes and the experiment of military service stress is commented
Estimate, which has stronger engineer application meaning in the design and maintenance of blade.
Claims (3)
1. a kind of experimental evaluation method of high-temperature alloy turbine blade military service stress, which is characterized in that specifically includes the following steps:
1) the lasting interrupt experiments of different stress under different temperatures and duration are carried out to turbo blade material DZ125 alloy, then
Quantitative statistics are carried out to γ ' the phase raft shape degree of perfection of alloy, it is perfect to obtain each stress and γ ' phase raft shape under the different temperatures time
Corresponding relationship between degree；
2) γ ' the phase raft shape degree of perfection of practical military service m hours DZ125 alloy vane a part is counted, is taken
Use as a servant γ ' the phase raft shape degree of perfection of m hours blades；
3) qualitative assessment that service temperature is carried out to the position, determines the service temperature range of blade；
4) on the basis of to the position service temperature assessment result, the assessment of average military service stress is carried out, i.e., by the position
γ ' phase raft shape after carrying out m hours lasting interrupt experiments within the scope of γ ' phase raft shape degree of perfection and the position service temperature is complete
Kind degree compares, and chooses stress evaluation knot of the range of stress as the position corresponding to similar raft shape degree of perfection
Fruit.
2. the experimental evaluation method of high-temperature alloy turbine blade military service stress as described in claim 1, which is characterized in that step
1) practical active time m hours of lasting interrupt experiments duration described in n hours and blade to be assessed are isometric, and active time m
Hour is no more than the design service life of blade.
3. the experimental evaluation method of high-temperature alloy turbine blade military service stress as described in claim 1, which is characterized in that step
3) it is averagely on active service described in the assessment of stress, is using γ ' phase raft shape degree of perfection as the microscopic structure of stress evaluation comparison ginseng
It measures, stress numerical corresponding to the similar condition of γ ' phase raft shape degree of perfection is similar.
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| CN107643139B (en) * | 2017-09-09 | 2020-09-18 | 吉安县裕兴科技有限公司 | Exploration engineering soft rock ground stress testing device |
| CN110411851B (en) * | 2019-07-22 | 2020-06-26 | 北京科技大学 | High-temperature alloy turbine blade service damage evaluation and creep life prediction method |
| CN110411850B (en) * | 2019-07-22 | 2020-10-09 | 北京科技大学 | Method for evaluating service conditions of high-temperature alloy turbine blade |
| CN111366450A (en) * | 2020-04-21 | 2020-07-03 | 中国航发沈阳发动机研究所 | Method for evaluating service structure damage of nickel-based superalloy turbine blade |
| CN112763525B (en) * | 2020-12-30 | 2022-08-16 | 北京钢研高纳科技股份有限公司 | Experimental evaluation method for service temperature and service stress of deformed high-temperature alloy turbine disk |
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| CN105403582A (en) * | 2015-12-22 | 2016-03-16 | 中国科学院金属研究所 | Damage evaluation method of service tissue of gas turbine blade |
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