CN106929652A - A kind of GH4169 separates out heat treatment method to connecting bolt second-phase dispersion - Google Patents
A kind of GH4169 separates out heat treatment method to connecting bolt second-phase dispersion Download PDFInfo
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- CN106929652A CN106929652A CN201710081401.8A CN201710081401A CN106929652A CN 106929652 A CN106929652 A CN 106929652A CN 201710081401 A CN201710081401 A CN 201710081401A CN 106929652 A CN106929652 A CN 106929652A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
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- Organic Chemistry (AREA)
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Abstract
Heat treatment method is separated out to connecting bolt second-phase dispersion the invention discloses a kind of GH4169, the method is that GH4169 is carried out into high density γ to connecting bolt first " mutually precipitation treatment; then carry out δ phases disperse educt heat treatment; 5~120min solid solutions finally are carried out below 960 DEG C; and 720 DEG C and 620 DEG C respectively be incubated 8h carry out bipolar aging treatment process, complete heat treatments of the GH4169 to connecting bolt.Military service the characteristic study achievement of the present invention according to GH4169 alloy bolts, with reference to γ " and δ phase Precipitation Behavior mechanism; avoid δ phases from being separated out in crystal boundary; and allow δ phases uniformly to be separated out on whole matrix; it is constant to obtain bolt strength by the heat treatment method; and δ phases can be in transgranular disperse, the process technology scheme of tiny precipitation, so that the GH4169 high-strength bolt fatigue lives used under solving the problems, such as normal temperature and reliability requirement.
Description
Technical field
Heat treatment method is separated out to connecting bolt second-phase dispersion the present invention relates to a kind of GH4169, belongs to component of machine system
Make technical field.
Background technology
On the one hand manufacture of the high intensity to connecting bolt will ensure intensity index high, on the other hand also need to fatigue higher
Life-span.Normal condition using the manufacture of high-strength bolt mainly use all kinds of precipitation-hardening stainless steels, and some aviations with starting
Machine can then meet the service demand of fastener under hot conditions from high temperature alloy, titanium alloy.
GH4169 alloy bolts are a kind of fasteners being on active service under the high temperature conditions, but with to environment and material
Understanding, it is found that GH4169 alloys have high corrosion resistance, and relatively low corrosion susceptibility under normal temperature condition, therefore adopt
Manufacture of the normal temperature high intensity to connecting bolt is carried out with GH4169 alloys, a lot, such as wind-driven generator, aircraft machine is disclosure satisfy that
The military service of the fasteners such as body, ocean platform needs.But GH4169 alloy prices are very expensive, in this context, how further
The service reliability of GH4169 alloys is played, Gh4169 alloy service lifes are greatly improved, be then that manufacture high-quality GH4169 is closed
The key of gold shell bolt.
Have three kinds of main phases, γ ', γ in GH4169 alloys " and δ phases, wherein γ ', γ " are the main reinforcings in alloy
Phase, its influence of quantity form to mechanical property has had a large amount of reports.And δ phases are a kind of stable phases in GH4169 alloys,
It is required that its precipitation in crystal boundary, primarily to ensureing that pinning lives crystal boundary, prevents the passage of the crystal boundary under the conditions of high-temperature service, carry
Creep, the enduring quality of GH4169 alloy components high.
But the GH4169 used under normal temperature, his creep rupture performance is not may require that, and δ phases separate out the influence to intensity
Relatively low, the precipitation of δ phases can reduce notch sensitivity, but reduce material notch sensitivity for there is many screw threads in structure
Tooth, being equal to for the bolt of notch effect then has more important meaning.But find under study for action, δ phases in GH4169 alloys
Simply intercrystalline precipitation, although can improve high-temerature creep enduring quality, but can cause crackle be very easy to germinating along crystal boundary with
Extension, the fatigue behaviour reduced during use is high.Therefore, based on the purpose, δ phases reduce notch sensitivity in terms of for
GH4169 bolts are favourable, but δ phase intercrystalline precipitations, then it is unfavorable with extension along the germinating of crystal boundary that can promote crackle, is needed
The effect of δ phases of maximizing favourable factors and minimizing unfavourable ones.
However, the heat treatment technics of GH4169 alloy components is to meet the requirement used under hot conditions at present, at heat
Precipitation of the δ phases in grain boundary area is promoted after reason, is as shown in Figure 1 GH4169 alloy scanning electron microscope (SEM) photographs, it is apparent from figure
Can be observed to use routinely 980 DEG C of insulation 60min Homogenization Treatments to be incubated 8h respectively at 720 DEG C and 620 DEG C carries out bipolar timeliness
In alloy after handling process, the obvious intercrystalline precipitation of δ phases.For this reason, it may be necessary to develop a kind of new, significant, feasibility compared with
Strong hot-working process, δ phases disperse educt in whole metallic matrix is promoted by the technology, on the one hand promotes transgranular δ phases
Uniform to separate out, the precipitation that crystal boundary δ phases are on the other hand reduced as far as possible is grown up, so as to meet the military service of high-performance GH4169 alloy bolts
It is required that.
The content of the invention
It is mainly meets to solve existing heat treatment technics and use under GH4169 hot conditions, its heat treating regime can be led
Cause the problem of δ phase intercrystalline precipitations, the military service the characteristic study achievement according to GH4169 alloy bolts of the invention, with reference to γ " and δ phases
Precipitation Behavior mechanism, there is provided a kind of GH4169 separates out heat treatment method to connecting bolt second-phase dispersion, by the heat treatment side
Method can obtain that bolt strength is constant, and δ phases can be in transgranular disperse, the process technology scheme of tiny precipitation, so as to solve under normal temperature
The GH4169 high-strength bolt fatigue lives for using and the problem of reliability requirement.
Technical scheme：A kind of GH4169 separates out heat treatment method to connecting bolt second-phase dispersion, and the method is
GH4169 is carried out into high density γ to connecting bolt first, and " mutually precipitation treatment then carries out the disperse educt heat treatment of δ phases, finally
5~120min solid solutions are carried out below 960 DEG C, and 8h are incubated respectively at 720 DEG C and 620 DEG C to carry out bipolar Ageing Treatment work
Skill, completes heat treatments of the GH4169 to connecting bolt.
In the above method, " mutually precipitation treatment is first in 940~1020 DEG C of guarantors by GH4169 to connecting bolt to the high density γ
After 5~60min of temperature completes solid solution, then " mutually separated out in 680~780 DEG C of insulation 4~12h completions γ.
In the above method, the disperse educt heat treatment of the δ phases is to carry out GH4169 at 780~940 DEG C to connecting bolt
The isothermal holding of 20~480min.
Due to using above-mentioned technical proposal, the advantage of the invention is that：The present invention is first according to GH4169 alloy phase change rules
Solution treatment first is carried out to GH4169 alloys, allow precipitated phase primarily forms element nb whole back dissolvings in matrix, then passes through
4~12h is incubated at 680~780 DEG C, metastable phase γ is only formed in the base, and " phase, due to γ " is mutually non-equilibrium phase, in the base
Unlike stable phase δ phases are selectively separated out on crystal boundary, but uniformly separated out in whole matrix." separated out completely in γ
Afterwards, by controlling holding temperature and soaking time, balance from non-equilibrium phase γ is promoted " mutually further change, while avoiding
Temperature high promotes δ phases directly to be separated out in grain boundary sites from matrix.The δ phases of disperse educt are thus obtained, further strong
In change solution treatment and aging treatment process, in order to avoid the δ phase back dissolvings of disperse educt, therefore it is required that its solid solubility temperature must be low
In 960 DEG C, Ageing Treatment is finally completed, just can so avoid δ phases from being separated out in crystal boundary, and make δ phases uniform on whole matrix
Separate out, so that the GH4169 high-strength bolt fatigue lives used under solving the problems, such as normal temperature and reliability requirement.
Brief description of the drawings
Fig. 1 is that GH4169 alloys bolt schemes (scanning electron microscope (SEM) photograph) by the SEM after normative heat treatment；
Fig. 2 is GH4169 alloys bolt by the δ distributed mutually metallographs after normative heat treatment.
Fig. 3 is GH4169 alloys bolt by the metallograph after method of the present invention treatment；
Specific embodiment
In order that the object, technical solutions and advantages of the present invention are clearer, with reference to the accompanying drawings and examples to this hair
It is bright to be described in further detail.
Embodiment
Now using certain model GH4169 alloy bolts as process object, and result is compared.
(1) normative heat treatment scheme：I.e. using being seen after conventional 980 DEG C of insulations 60min Homogenization Treatments, at 720 DEG C and 620
Insulation 8h carries out bipolar Ageing Treatment DEG C respectively.It is as shown in Figure 2 by the metallograph after normative heat treatment.
(2) heat-treatment protocol of the invention：A kind of GH4169 of the invention is separated out to connecting bolt second-phase dispersion and is heat-treated
Method, the method is that GH4169 is carried out into high density γ to connecting bolt first, and " mutually precipitation treatment, the high density γ " is mutually separated out
Treatment be first by GH4169 to connecting bolt 1020 DEG C be incubated 60min complete solid solution after, then 780 DEG C be incubated 12h complete γ " phases
Separate out；The disperse educt heat treatment of δ phases is then carried out, the disperse educt heat treatment of the δ phases is that GH4169 exists to connecting bolt
940 DEG C of isothermal holdings for carrying out 480min；120min solid solutions are finally carried out below 960 DEG C, and at 720 DEG C and 620 DEG C points
Not Bao Wen 8h carry out bipolar aging treatment process, complete heat treatments of the GH4169 to connecting bolt.By of the invention
Metallograph after method treatment is as shown in Figure 3.
Normative heat treatment conceptual scheme 2 is relatively can be seen that by Fig. 2 and Fig. 3, δ precipitated phases are from crystal boundary to transgranular
Extend, continuously separated out from crystal boundary, and by the obvious diffusing particle shape in the middle of crystal grain of δ precipitated phases after method of the present invention treatment
Separate out, such as Fig. 3, just can so avoid δ phases from being separated out in crystal boundary, and allow δ phases uniformly to be separated out on whole matrix, so as to solve often
The GH4169 high-strength bolt fatigue lives used under temperature and the problem of reliability requirement.
Claims (3)
1. a kind of GH4169 separates out heat treatment method to connecting bolt second-phase dispersion, it is characterised in that：GH4169 is docked first
Bolt carries out high density γ, and " mutually precipitation treatment, then carries out the disperse educt heat treatment of δ phases, and 5 are finally carried out below 960 DEG C
~120min solid solutions, and 720 DEG C and 620 DEG C respectively insulation 8h carry out bipolar aging treatment process, complete
Heat treatments of the GH4169 to connecting bolt.
2. GH4169 according to claim 1 separates out heat treatment method to connecting bolt second-phase dispersion, it is characterised in that：Institute
State high density γ " mutually precipitation treatment be first by GH4169 to connecting bolt 940~1020 DEG C be incubated 5~60min complete solid solution after,
4~12h completions γ is incubated at 680~780 DEG C again " mutually to separate out.
3. GH4169 according to claim 1 separates out heat treatment method to connecting bolt second-phase dispersion, it is characterised in that：Institute
The disperse educt heat treatment for stating δ phases is the isothermal holding that GH4169 is carried out 20~480min to connecting bolt at 780~940 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710081401.8A CN106929652B (en) | 2017-02-15 | 2017-02-15 | Heat treatment method is precipitated to connecting bolt second-phase dispersion in a kind of GH4169 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710081401.8A CN106929652B (en) | 2017-02-15 | 2017-02-15 | Heat treatment method is precipitated to connecting bolt second-phase dispersion in a kind of GH4169 |
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| CN106929652A true CN106929652A (en) | 2017-07-07 |
| CN106929652B CN106929652B (en) | 2018-07-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108491658A (en) * | 2018-04-02 | 2018-09-04 | 北京航空航天大学 | A kind of low cycle fatigue life appraisal procedure for considering GH4169 alloy microstructures and influencing |
| CN109321854A (en) * | 2018-11-16 | 2019-02-12 | 首都航天机械有限公司 | A kind of heat treatment process improving precinct laser fusion forming GH4169 alloy cold plasticity |
| CN115433892A (en) * | 2022-09-14 | 2022-12-06 | 贵州大学 | Method for simultaneously improving strength and plasticity of GH4169 high-temperature alloy plate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165204A (en) * | 1996-05-09 | 1997-11-19 | 沈阳黎明发动机制造公司 | Method for nickel-base high-temp. alloy forging and bar acquiring uniform superfine crystalline grain |
| JP2005350744A (en) * | 2004-06-11 | 2005-12-22 | Toshiba Corp | Recovery treatment method for deterioration/damage of material in gas turbine component and gas turbine component |
| CN101486135A (en) * | 2008-01-18 | 2009-07-22 | 中国科学院金属研究所 | GH4169 high-temperature alloy welding wire |
| CN104372277A (en) * | 2014-11-28 | 2015-02-25 | 中国科学院金属研究所 | Granular delta-phase uniformly distributed GH4169 alloy preparation method |
-
2017
- 2017-02-15 CN CN201710081401.8A patent/CN106929652B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1165204A (en) * | 1996-05-09 | 1997-11-19 | 沈阳黎明发动机制造公司 | Method for nickel-base high-temp. alloy forging and bar acquiring uniform superfine crystalline grain |
| JP2005350744A (en) * | 2004-06-11 | 2005-12-22 | Toshiba Corp | Recovery treatment method for deterioration/damage of material in gas turbine component and gas turbine component |
| CN101486135A (en) * | 2008-01-18 | 2009-07-22 | 中国科学院金属研究所 | GH4169 high-temperature alloy welding wire |
| CN104372277A (en) * | 2014-11-28 | 2015-02-25 | 中国科学院金属研究所 | Granular delta-phase uniformly distributed GH4169 alloy preparation method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108491658A (en) * | 2018-04-02 | 2018-09-04 | 北京航空航天大学 | A kind of low cycle fatigue life appraisal procedure for considering GH4169 alloy microstructures and influencing |
| CN108491658B (en) * | 2018-04-02 | 2019-05-07 | 北京航空航天大学 | A kind of low cycle fatigue life appraisal procedure |
| CN109321854A (en) * | 2018-11-16 | 2019-02-12 | 首都航天机械有限公司 | A kind of heat treatment process improving precinct laser fusion forming GH4169 alloy cold plasticity |
| CN115433892A (en) * | 2022-09-14 | 2022-12-06 | 贵州大学 | Method for simultaneously improving strength and plasticity of GH4169 high-temperature alloy plate |
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| CN106929652B (en) | 2018-07-24 |
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