CN105463355A - Cyclic heat treatment process of high-density tungsten alloy - Google Patents
Cyclic heat treatment process of high-density tungsten alloy Download PDFInfo
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- CN105463355A CN105463355A CN201410510794.6A CN201410510794A CN105463355A CN 105463355 A CN105463355 A CN 105463355A CN 201410510794 A CN201410510794 A CN 201410510794A CN 105463355 A CN105463355 A CN 105463355A
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Abstract
The invention provides a cyclic heat treatment process of high-density tungsten alloy in order to adjust the high-density alloy structure and overcome the defects in the prior art. Raw materials of W powder, Ni powder and Fe powder are matched according to the mass ratio that m(W): m(Ni): m(Fe) = 90: 7: 3; the raw materials are mixed for 24 hours in a ball mill barrel; the mixed powder are subjected to isostatic cool pressing at the pressure of 200 MPa and sintered in the hydrogen atmosphere under the industrial condition; a sintered sample is put into a vacuum furnace of 10-20 Pa to be subjected to vacuum dehydrogenation treatment of 1170 DEG C/60 min; then the sintered sample subjected to vacuum heat treatment is subjected to heat preservation of 1170 DEG C/20 min in a molybdenum wire heating furnace protected by argon and then is subjected to water quenching. The process of heating, heat preservation and water quenching is one time of cyclic heat treatment, and four times of cyclic heat treatment are conducted in total.
Description
Technical field
The present invention relates to a kind of circle heat treatment of high density tungsten alloy, belong to alloy property optimisation technique field.
Background technology
High density tungsten alloy not only density is large, and there is the performance of a series of excellences such as intensity is high, hardness is high, ductility is good, machining property is good, thermal expansivity is little, thermal conductivity is large, anti-oxidant and erosion resistance good, weldability is good, and be widely used in hard-core technology field, defence and military and civilian industry, be such as used as the bullet core material, counterweight element, inertance element, radiation shielding material etc. of rod-type kinetic energy penetrator.Along with the strengthening day by day of modern main battle tank, warship armor and various military fortification, more and more higher requirement is proposed to armour piercing shot performance.High density tungsten alloy rod-type kinetic energy penetrator, not only there is good armour-piercing capability, and compared with Depleted Uranium Alloys armour piercing shot, also there is the advantage such as nontoxicity, no radioactivity pollute, therefore become a kind of important weapon of world today's military equipment, be also the Main way of armour piercing shot Future Development simultaneously.Make high density tungsten alloy have high intensity and toughness, it first must be made to obtain desirable microtexture, and thermal treatment is the important means of adjustment heavy metal tissue.
Current domestic scholars on the vacuum heat treatment of sintered state tungstenalloy in the impact of its mechanical property and study mechanism more, and the further cycle heat treatment of tungstenalloy after vacuum heat treatment to be still had some deficits in the impact of tungstenalloy mechanical property and the research of relevant mechanism.
Summary of the invention
The problem to be solved in the present invention: the circle heat treatment providing a kind of high density tungsten alloy, is intended to adjustment heavy metal tissue, to overcome the deficiencies in the prior art.
Technical scheme of the present invention:
A kind of circle heat treatment of high density tungsten alloy, by raw material W powder, Ni powder, Fe powder m(W in mass ratio): m(Ni): m(Fe)=carry out proportioning at 90: 7: 3, batch mixing 24h in ball milling bucket again, mixed powder is through 200MPa cold isostatic compaction and sinter under industrial condition in nitrogen atmosphere, and vacuum oven sintered specimen being placed in 10-20Pa carries out the process of 1170 DEG C/60min vacuum dehydrogenation; Then, be incubated carrying out 1170 DEG C/20min in the molybdenum filament process furnace of the sintered specimen through vacuum heat treatment in argon shield, carry out shrend immediately, this " heating-insulating-shrend " process is a cycle heat treatment, carries out four cycle heat treatment altogether.
Described sintering temperature 1480 DEG C, soaking time 60min.
Beneficial effect of the present invention:
In the present invention, cycle heat treatment can significantly improve impelling strength and the tensile strength of 90W-7Ni-3Fe high density tungsten alloy, its mainly cycle heat treatment improve W-Binder Phase interface ratio in alloy, reduce W-W crystal boundary ratio, and the W be partly dissolved in Binder Phase has little time to separate out in quenching process, Binder Phase is served to the effect of solution strengthening.
embodiment:
Embodiment:
Select the granularity of raw material W powder, Ni powder, Fe powder and major impurity content in table 1.
First, by powder m(W in mass ratio listed by table 1): m(Ni): m(Fe)=carry out proportioning at 90: 7: 3, batch mixing 24h in ball milling bucket again, mixed powder sinters (sintering temperature 1480 DEG C through 200MPa cold isostatic compaction and in nitrogen atmosphere under industrial condition, soaking time 60min), and vacuum oven sintered specimen being placed in 10-20Pa carries out the process of 1170 DEG C/60min vacuum dehydrogenation.Then, being incubated carrying out 1170 DEG C/20min in the molybdenum filament process furnace of the sintered specimen through vacuum heat treatment in argon shield, carrying out shrend immediately.This " heating-insulating-shrend " process is a cycle heat treatment, carries out four cycle heat treatment altogether.
To the 90W-7Ni-3Fe high density tungsten alloy sample after each cycle heat treatment, all carry out the test of tensile strength, unit elongation and impelling strength, and observe its fracture apperance.Tensile strength and the unit elongation of tension specimen (adopting the cylinder sample in GB7963-87) is measured with multifunctional material mechanics testing machine; The impelling strength of impact specimen (adopting 8.0mm × 8.0mm × 55.0mm non-notch sample) is measured with JB-150 type Charpy impact machine tester.
Table 2 list measure sintering final vacuum heat treatment state and through the tensile strength of different number of cycles heat treated 90W-7Ni-3Fe high density tungsten alloy sample, unit elongation and impelling strength.In table, each data are the mean value of 4 test results (namely 4 samples are all got in each test).These data show, along with the increase of cycle heat treatment number of times, tensile strength and the impelling strength of 90W-7Ni-3Fe high density tungsten alloy all improve constantly, and unit elongation then declines to some extent.
Claims (2)
1. the circle heat treatment of a high density tungsten alloy, it is characterized in that: by raw material W powder, Ni powder, Fe powder m(W in mass ratio): m(Ni): m(Fe)=carry out proportioning at 90: 7: 3, batch mixing 24h in ball milling bucket again, mixed powder is through 200MPa cold isostatic compaction and sinter under industrial condition in nitrogen atmosphere, and vacuum oven sintered specimen being placed in 10-20Pa carries out the process of 1170 DEG C/60min vacuum dehydrogenation; Then, be incubated carrying out 1170 DEG C/20min in the molybdenum filament process furnace of the sintered specimen through vacuum heat treatment in argon shield, carry out shrend immediately, this " heating-insulating-shrend " process is a cycle heat treatment, carries out four cycle heat treatment altogether.
2. the circle heat treatment of a kind of high density tungsten alloy according to claim 1, is characterized in that: described sintering temperature 1480 DEG C, soaking time 60min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410510794.6A CN105463355A (en) | 2014-09-29 | 2014-09-29 | Cyclic heat treatment process of high-density tungsten alloy |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410510794.6A CN105463355A (en) | 2014-09-29 | 2014-09-29 | Cyclic heat treatment process of high-density tungsten alloy |
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| CN105463355A true CN105463355A (en) | 2016-04-06 |
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| CN201410510794.6A Pending CN105463355A (en) | 2014-09-29 | 2014-09-29 | Cyclic heat treatment process of high-density tungsten alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426997A (en) * | 2021-06-11 | 2021-09-24 | 西安交通大学 | High-specific-gravity tungsten-nickel-iron alloy and laser additive manufacturing method thereof |
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2014
- 2014-09-29 CN CN201410510794.6A patent/CN105463355A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113426997A (en) * | 2021-06-11 | 2021-09-24 | 西安交通大学 | High-specific-gravity tungsten-nickel-iron alloy and laser additive manufacturing method thereof |
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