CN110408755A - A kind of aging process improving TiC-Cr-Mo base steel composite material dimensional stability - Google Patents

A kind of aging process improving TiC-Cr-Mo base steel composite material dimensional stability Download PDF

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Publication number
CN110408755A
CN110408755A CN201910808177.7A CN201910808177A CN110408755A CN 110408755 A CN110408755 A CN 110408755A CN 201910808177 A CN201910808177 A CN 201910808177A CN 110408755 A CN110408755 A CN 110408755A
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tic
alloy
ultrasonic
base steel
aging
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CN110408755B (en
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肖来荣
涂晓萱
赵小军
蔡圳阳
谭威
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Central South University
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Central South University
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/04General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/002Heat treatment of ferrous alloys containing Cr
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING 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
    • C21D6/00Heat treatment of ferrous alloys
    • C21D6/04Hardening by cooling below 0 degrees Celsius

Abstract

The invention discloses a kind of aging process for improving TiC-Cr-Mo base steel composite material dimensional stability, the following steps are included: TiC-Cr-Mo alloy sample is carried out heating ultrasonic ageing effect, then liquid nitrogen ultrasonic ageing effect is carried out, cold cycling is carried out to alloy sample according to the technique and cooperates with ultrasonic vibration, obtains the alloy sample of dimensionally stable.The present invention cooperates with ultrasonic vibration that can significantly improve the structure stability of TiC-Cr-Mo base steel composite material by cold cycling, and has cut down the residual stress of composite inner, the final dimensional stability for improving TiC-Cr-Mo alloy.The TiC-Cr-Mo base steel composite material that the method for the present invention is handled, compared with the alloy that conventional treatment method obtains, alloy surface residual stress is reduced to -10~30MPa by -250~-200MPa, and the hardness of alloy is improved by 900~940HV to 1000~1200HV.

Description

A kind of aging process improving TiC-Cr-Mo base steel composite material dimensional stability
Technical field
The invention belongs to composites processing technology fields, and in particular to a kind of raising TiC-Cr-Mo base steel composite material The aging process of dimensional stability.
Background technique
TiC-Cr-Mo base steel composite material is mainly matrix by hard phase, chrome molybdenum low-alloy steel of TiC, hard phase TiC's Content is 35wt.%, and Cr, Mo content are respectively 2wt.%;Generally after sintering, forging, annealing and a series of conventional treatments of tempering, It can be used for preparing kinetic pressure air-float bearing of inner, cold-working tool and mould, the amount fixture etc. in navigation system, such product is in long time stability It all needs to keep its materials microstructure stability in use process.Influence the principal element master of material structure and stability There are the differentiation of microscopic structure of material during preparation, processing or military service and the release of material internal residual stress.
Currently, heat treatment is to improve the conventional method of materials microstructure stability.It is mainly certain by heating the material to Temperature carries out ageing treatment, thus the purpose of microscopic structure required for obtaining;Although heat-treating methods can be mentioned effectively High materials microstructure stability, but the common shadow due to the dimensional stability of material by microscopic structure and residual stress It rings, thus there is also certain limitations in terms of improving dimension stability.
Ultrasonic vibration is a kind of effective ways for eliminating material residual stress, it mainly utilizes in vibration processes and produces on component The residual stress of raw vibration stress and component inside interacts, and allows and residual stress relaxation and discharges, to improve component Stability is not influenced by the size of material, shape etc., is remarkably improved the mechanical property of material.Currently, researcher The method of single heat treatment or vibration is mostly used to improve materials microstructure stability, for some large-scale components Speech, oscillating aging are still the most popular method for eliminating material residual stress, and the method for finite element modelling can be used to material vibrating Residual stress after timeliness is analyzed;Heat treatment improves material mechanical performance most to be effectively improved materials microstructure structure Common method.However, to improve the dimensional stability of TiC-Cr-Mo base steel composite material after conventional method is handled, use is single There are still following deficiencies for the method for heat treatment or ultrasonic vibration: 1. due to the hard phase TiC particle and base steel in the composite material There are larger differences for elasticity modulus between body, easily cause stress in interface and concentrate to generate cracking, influence material It is fine and close and stable and reliable for performance, thus the single processing mode of use can not combine the stability of material structure and stress; 2. the dimensional stability for improving material is that material microstructure is stable and residual stress is eliminated coefficient as a result, passing through at heat Though the method for reason can get metastable microscopic structure, for the residual stress that effectively eliminates material internal, there is also certain Limitation.
Summary of the invention
It is an object of the invention to provide it is a kind of improve TiC-Cr-Mo base steel composite material dimensional stability aging process, This method can effectively reduce the residual stress inside alloy, and matrix microscopic structure is uniform, improve alloy rigidity and ruler to reach The purpose of very little stability.
This aging process for improving TiC-Cr-Mo base steel composite material dimensional stability of the present invention, comprising the following steps:
TiC-Cr-Mo alloy sample is subjected to heating ultrasonic ageing effect, liquid nitrogen ultrasonic ageing effect is then carried out, according to the technique pair Alloy sample carries out circular treatment, obtains the alloy sample of dimensionally stable.
The heating temperature of the heating ultrasonic ageing effect is 30~100 DEG C, and aging time is 5~300min, ultrasound Oscillation power is 180W-1200W, vibration frequency 40kHz.
The liquid nitrogen ultrasonic ageing effect temperature is -196 DEG C, and aging time is 5~300min, and ultrasonic vibration power is 180W-1200W, vibration frequency 40kHz.
The cycle-index of the circular treatment is 2~12 times.
The principle of the present invention: the present invention is using the method for heating ultrasound and liquid nitrogen ultrasonic multiple circulation to TiC-Cr-Mo steel Based composites are handled, and can be effectively facilitated retained austenite metastable in basis material to martensite transfor mation, be improved material The structure stability of material;Under ultrasonic vibration synergistic effect, the residual stress in material can be further decreased, improves TiC-Cr- The dimensional stability of Mo alloy.The essence of this processing method of the present invention is vibrated by cold cycling treatment assisting ultrasonic, to conjunction Golden sample interior applies an additional stress and meets or exceeds material after additional stress is superimposed with the residual stress of workpiece itself When the microcosmic yield limit of material, microcosmic or macroscopical local, whole elastic-plastic deformation (cold cycling treatment will occur for workpiece The toughness of alloy can be significantly improved under the premise of keeping alloy strength and hardness), while reducing and being homogenized the residual of inside workpiece Residue stress, being finally reached prevents workpiece deformation and cracking, stablizes workpiece size, improves the purpose of material structure stability.
Beneficial effects of the present invention: 1) present invention can be obvious by the method for heating ultrasound and liquid nitrogen ultrasonic multiple circulation The structure stability of TiC-Cr-Mo base steel composite material is improved, and has cut down the residual stress of composite inner, it is final to improve The dimensional stability of TiC-Cr-Mo alloy.2) method of heating ultrasound of the invention and liquid nitrogen ultrasonic multiple circulation is relative to list One heating or ultrasonic vibration treatment mode, scantling is more stable, compared to single stable heat treatment mode, experiment week Phase is shorter, more efficient, low energy consumption, pollution-free.3) the TiC-Cr-Mo base steel composite material that the method for the present invention is handled, with The alloy that conventional treatment method (traditional sintering+forging+annealing+tempering) obtains is compared, alloy surface residual stress by- 250~-200MPa is reduced to -150~30MPa, and the hardness of alloy is improved by 900~940HV to 1000~1200HV;Definition institute Product to be placed at room temperature for the size changing rate after 30d be that products obtained therefrom is placed at room temperature for the change in size after 30d after A, conventional treatment Rate is B;A/B=0.4~0.6.
Detailed description of the invention
The XRD diagram of the TiC-Cr-Mo alloy sample of (b) after (a) and embodiment 1 are handled after Fig. 1 conventional treatment.
The SEM figure of the TiC-Cr-Mo alloy sample of (b) after (a) and embodiment 1 are handled after Fig. 2 conventional treatment.
Specific embodiment
Embodiment 1
TiC-Cr-Mo steel based alloy sample is placed in using distilled water to heat in the ultrasonic device of sonification medium first Ultrasonic vibration treatment, wherein heating temperature is 80 DEG C, time of vibration 60min, vibration frequency 40kHz, power 240W; After heating ultrasonic treatment at once by TiC-Cr-Mo alloy sample be placed in using liquid nitrogen as in the ultrasonic device of sonification medium into Row ultrasonic vibration treatment, wherein cooling temperature is -196 DEG C, time of vibration 120min, vibration frequency 40kHz, and power is 240W;According to above-mentioned process cycles 6 times, the TiC-Cr-Mo alloy sample that obtains that treated.
The residual stress for the alloy surface that the present embodiment is handled is -9MPa, and the hardness of alloy is 1042HV, magnetic saturation Intensity is 93emu/g, and measurement products obtained therefrom is placed at room temperature for the size changing rate after 30d, calculates A/B=A/B=0.4~0.6.
(traditional sintering+forging+annealing+tempering) and the method for the present invention treated TiC-Cr- after conventional treatment Mo alloy sample carries out XRD analysis, and result is as shown in Figure 1: it can be seen from the figure that the master of initial state TiC-Cr-Mo alloy It forms mutually as TiC, α-Fe and a small amount of retained austenite;It is residual after the present embodiment cold cycling cooperates with ultrasonic vibration treatment Remaining austenite disappears substantially, this is conducive to the dimensional stability for improving alloy, also illustrates that oscillating aging is to promote TiC-Cr-Mo to close A kind of effective method of the microstructure and property stability of gold.
(traditional sintering+forging+annealing+tempering) and the method for the present invention treated TiC-Cr- after conventional treatment The sem analysis of Mo alloy sample, as a result as shown in Figure 2;As can be seen from Figure 2: the martensite number after vibration stress relief treatment, in matrix Amount increases.May be in this way because with oscillating aging progress, carbide particle increases in steel matrix, and more carbide Grain is gathered near TiC particle.The segregation of carbon atom reduces the carbon content in retained austenite, destroys its chemical stabilization Property, cause transformation of the retained austenite to martensite;Meanwhile with the increase of time of vibration, the martensitic structure in matrix is long Greatly, alloy interior energy storage under the action of temperature and vibration increases, this grows up for martensitic structure provides driving force, promotes geneva Body tissue is grown up.
Embodiment 2
TiC-Cr-Mo steel based alloy sample is placed in using distilled water to heat in the ultrasonic device of sonification medium first Ultrasonic vibration treatment, wherein heating temperature is 100 DEG C, time of vibration 180min, vibration frequency 40kHz, and power is 240W;TiC-Cr-Mo alloy sample is placed in the ultrasonic device using liquid nitrogen as sonification medium at once after heating ultrasonic treatment Middle carry out ultrasonic vibration treatment, wherein cooling temperature is -196 DEG C, time of vibration 240min, vibration frequency 40kHz, function Rate is 240W;According to above-mentioned process cycles 4 times, the TiC-Cr-Mo alloy sample that obtains that treated.
The residual stress for the alloy surface that the present embodiment is handled is 11MPa, and the hardness of alloy is 1098HV, magnetic saturation Intensity is 97emu/g, and measurement products obtained therefrom is placed at room temperature for the size changing rate after 30d, calculates A/B=A/B=0.4~0.6.
Embodiment 3
TiC-Cr-Mo steel based alloy sample is placed in using distilled water to heat in the ultrasonic device of sonification medium first Ultrasonic vibration treatment, wherein heating temperature is 100 DEG C, time of vibration 240min, vibration frequency 40kHz, and power is 240W;TiC-Cr-Mo alloy sample is placed in the ultrasonic device using liquid nitrogen as sonification medium at once after heating ultrasonic treatment In middle carry out ultrasonic vibration treatment, wherein cooling temperature be -196 DEG C, time of vibration 300min, vibration frequency 40kHz, Power is 240W;According to above-mentioned process cycles 8 times, the TiC-Cr-Mo alloy sample that obtains that treated.
The residual stress for the alloy surface that the present embodiment is handled is 23MPa, and the hardness of alloy is 1134HV, magnetic saturation Intensity is 112emu/g, and measurement products obtained therefrom is placed at room temperature for the size changing rate after 30d, calculates A/B=A/B=0.4~0.6.

Claims (4)

1. a kind of aging process for improving TiC-Cr-Mo base steel composite material dimensional stability, comprising the following steps:
TiC-Cr-Mo alloy sample is subjected to heating ultrasonic ageing effect, liquid nitrogen ultrasonic ageing effect is then carried out, according to the technique to alloy Sample carries out circular treatment, obtains the alloy sample of dimensionally stable.
2. the aging process according to claim 1 for improving TiC-Cr-Mo base steel composite material dimensional stability, feature It is, the heating temperature of the heating ultrasonic ageing effect is 30~100 DEG C, and aging time is 5~300min, ultrasonic vibration Power is 180W-1200W, vibration frequency 40kHz.
3. the aging process according to claim 1 for improving TiC-Cr-Mo base steel composite material dimensional stability, feature It is, the liquid nitrogen ultrasonic ageing effect temperature is -196 DEG C, and aging time is 5~300min, and ultrasonic vibration power is 180W-1200W, vibration frequency 40kHz.
4. the aging process according to claim 1 for improving TiC-Cr-Mo base steel composite material dimensional stability, feature It is, the cycle-index of the circular treatment is 2~12 times.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1752223A (en) * 2005-08-04 2006-03-29 上海交通大学 Heating and vibrating stress removing method for metal material
CN102286658A (en) * 2011-08-26 2011-12-21 哈尔滨工业大学 Method for improving dimension stability of 1Cr18Ni9Ti austenitic stainless steel
CN103469132A (en) * 2013-09-29 2013-12-25 常州市润源经编机械有限公司 Treating method for improving g strength and toughness of magnesium alloy materials
CN103510028A (en) * 2013-09-29 2014-01-15 常州市润源经编机械有限公司 Method for carrying out enhancement processing on intensity and toughness of light alloy material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1752223A (en) * 2005-08-04 2006-03-29 上海交通大学 Heating and vibrating stress removing method for metal material
CN102286658A (en) * 2011-08-26 2011-12-21 哈尔滨工业大学 Method for improving dimension stability of 1Cr18Ni9Ti austenitic stainless steel
CN103469132A (en) * 2013-09-29 2013-12-25 常州市润源经编机械有限公司 Treating method for improving g strength and toughness of magnesium alloy materials
CN103510028A (en) * 2013-09-29 2014-01-15 常州市润源经编机械有限公司 Method for carrying out enhancement processing on intensity and toughness of light alloy material

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