CN101560592A - Circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel - Google Patents
Circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel Download PDFInfo
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- CN101560592A CN101560592A CNA2008100110453A CN200810011045A CN101560592A CN 101560592 A CN101560592 A CN 101560592A CN A2008100110453 A CNA2008100110453 A CN A2008100110453A CN 200810011045 A CN200810011045 A CN 200810011045A CN 101560592 A CN101560592 A CN 101560592A
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- crystal grain
- maraging steel
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- grain thinning
- circulating phase
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- 239000013078 crystal Substances 0.000 title claims abstract description 24
- 229910001240 Maraging steel Inorganic materials 0.000 title claims abstract description 19
- 238000005516 engineering process Methods 0.000 title claims abstract description 18
- 229910052796 boron Inorganic materials 0.000 title claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 abstract description 7
- 229910001566 austenite Inorganic materials 0.000 abstract description 4
- 238000005242 forging Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract 1
- 238000000265 homogenisation Methods 0.000 abstract 1
- 238000013021 overheating Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
- 238000010313 vacuum arc remelting Methods 0.000 description 1
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Abstract
The invention relates to the field of crystal grain thinning, in particular to a circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel. The technology comprises the following steps: firstly, heating to 1050 DEG C to 1100 DEG C, preserving the heat for 10 minutes to 30 minutes before water cooling and carrying out circulating treatment for 2 to 3 times to eliminate coarse borides (directly carrying out the subsequent technologies when no coarse boride is separated); and then, rapidly heating to 950 DEG C to 1050 DEG C and carrying out short-time heat-preservation circulating treatment to obtain a crystal grain size at 6 stage to 9 stage. The invention can be used for thinning the original austenite crystal grain size of the micro-boron cobalt-free maraging steel, is particularly suitable for improving the hot-perforating piece coarse texture of the material and eliminating the coarse borides separated on a grain boundary and can be also used for improving the texture uniformity of open die forgings, the coarse texture and various overheating textures of castings after homogenization treatment, and the like.
Description
Technical field:
The present invention relates to the circulating phase-transition crystal grain thinning technology in grain refining field, particularly a kind of micro-boron cobalt-free maraging steel.
Background technology:
Advantages such as maraging steel has intensity height, good toughness, be easy to processing, thermal treatment process is simple, at thin-walled pressure vessel etc. specific tenacity and the higher field of security requirement have been obtained using widely, as the housing of rocket engine, missile case, uranium separation centrifuges rotating cylinder etc.One step hot piercing operation is arranged in the manufacturing processed of thin-walled pressure vessel, and its hot processing temperature that adopts is higher, and grain fineness number is grown up to more than 3 grades, and this all causes adverse influence to the carrying out of subsequent technique and the performance of final material.Need a kind of feasible crystal grain thinning technology method of research to eliminate this coarse grain.
The circulating phase-transition crystal grain thinning method is as a kind of method of crystal grain thinning, has the processing of need not, to the no requirement (NR) of material shape size, characteristics such as simple to operate, is a kind of simple crystal grain thinning method, is fit to very much be used for eliminating above-mentioned thick tissue.For maraging steel, circulating phase-transition crystal grain thinning is to become the purpose that austenite recrystallization is realized crystal grain thinning by repeatedly taking a turn for the worse.
Micro-boron cobalt-free maraging steel is not because of containing expensive strategic Elements C o in the composition, cost has obtained reducing greatly, and mechanical property is suitable with the mechanical property that contains the cobalt maraging steel below the 2100MPa rank, and this just promotes its application in high-tech sector greatly.But the adding of boron has improved reverse greatly and has become austenite recrystallization temperature, and the thin brilliant technology of the circulating phase-change of so common maraging steel (800～900 ℃ are incubated 10～60 fens) is just no longer suitable in micro-boron cobalt-free maraging steel.In addition, boron is easy to separate out boride 800～1000 ℃ temperature range, be incubated long-time in this temperature range, will generate thick Bization thing, worsen material property, need to select suitable circulating phase-change process system can avoid separating out of boride and can reach thin preferably brilliant effect.
Mainly there is following problem in the formulation of micro-boron cobalt-free maraging steel circulating phase-transition crystal grain thinning technology: the 1) selection of temperature, if adopt lower temperature (＜1000 ℃) can cause separating out of Bization thing, if adopt higher temperature (＞1000 ℃), grain growth speed is very fast.2) selection of rate of heating and speed of cooling, the temperature range that meeting is easy to separate out through boride in the heating and cooling process, heating can both cause separating out of boride with cooling off at a slow speed at a slow speed.
Summary of the invention:
The circulating phase-transition crystal grain thinning technology that the purpose of this invention is to provide a kind of micro-boron cobalt-free maraging steel, after circulating phase-change is handled several times, can obtain tiny grain-size, avoid separating out of thick boride simultaneously, make described material obtain excellent mechanical property.
Technical scheme of the present invention is:
A kind of circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel by rapid heating, high temperature, short time insulation, fast cooling, is realized the circulating phase-change processing.Be specially:
Be heated to 1050～1100 ℃, be incubated water-cooled after 10～30 minutes, eliminate thick boride through 2～3 circular treatment and separate out (technology of directly carrying out the back when not having thick boride and separating out), then rapid heating (〉=10 ℃/s) to 950～1050 ℃, be incubated water-cooled after 1～3 minute, after circular treatment 3～5 times, can obtain 6～9 grades grain fineness number.
The invention has the beneficial effects as follows:
The present invention can be used for refinement micro-boron cobalt-free maraging steel original austenite grain size, be particularly suitable for being used for improving described material hot piercing part thick tissue, eliminate the thick boride of separating out on the crystal boundary, also can be used for improving the homogeneity of structure of open die forgings, thick tissue after the foundry goods homogenizing is handled and various overheated structures etc.
Description of drawings
Fig. 1 is a circulating phase-change heat treatment process synoptic diagram of the present invention.
Fig. 2 is the metallograph of embodiment 4 correspondences.
Embodiment
Utilize the present invention that a kind of trace B element cobalt-free maraging steel T250 that contains has been carried out experimental study, (wt%) is as follows for the chemical ingredients of material: 17.8Ni, 3.0Mo, 1.5Ti, 0.003B, C＜0.03, S＜0.02, P＜0.02.
The material steel ingot forms by vacuum induction melting and vacuum arc remelting, homogenizes through 1200 ℃ and forges into the experiment materials after handling.
Material described in the embodiment is at first handled through 1200 ℃/1h high temperature solid solution, makes grain growth to 0 grade.
Material is as shown in table 1 through the mechanical property before and after the circulating phase-transition crystal grain thinning.
Mechanical property before and after table 1 circulating phase-transition crystal grain thinning
| Average grain size | Yield strength (MPa) | Tensile strength (MPa) | Unit elongation (%) | Relative reduction in area (%) | |
| Before the circulating phase-change | 430μm | 1738 | 1824 | 3.0 | 21.6 |
| Behind the circulating phase-change | 38μm | 1846 | 1912 | 8.8 | 50.6 |
By table 1 as seen, after the circulating phase-transition crystal grain thinning processing, intensity increases, and plasticity is significantly improved, and makes material obtain excellent mechanical property.
Below by embodiment in detail the present invention is described in detail.
Heat treatment process such as Fig. 1, the grain size behind concrete rate of heating, holding temperature and time, speed of cooling, cycle index and the circulating phase-change is as shown in table 2.
Table 2 embodiment
| Rate of heating | Holding temperature and time | The type of cooling | Cycle index | Grain size behind the circulating phase-change | |
| Embodiment 1 | About 10 ℃/s | 1100℃/10min→ 1050℃/10min→ 1050℃/1min→ 1050℃/1min→ 1050℃/1min | Water-cooled | 5 times | 38μm |
| Embodiment 2 | About 10 ℃/s | 1100℃/10min→ 1050℃/10min→ 1000℃/1min→ 1000℃/1min→ 1000℃/1min | Water-cooled | 5 times | 24μm |
| Embodiment 3 | About 10 ℃/s | 1100℃/10min→ 1050℃/10min→ 1000℃/3min→ 1000℃/3min→ 1000℃/3min | Water-cooled | 5 times | 32μm |
| Embodiment 4 | About 10 ℃/s | 1100℃/10min→ 1050℃/10min→ 1000℃/1min→ 975℃/1min→ 950℃/1min→ 950℃/1min | Water-cooled | 6 times | 15μm |
Metallographic behind the circulating phase-change adopts circulating phase-change technology of the present invention to reach the purpose of crystal grain thinning as shown in Figure 2 as can be seen.
Claims (3)
1, a kind of circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel is characterized in that:
(1) is being heated to 1050～1100 ℃, is being incubated water-cooled after 10～30 minutes, eliminating thick boride through 2～3 circular treatment and separate out;
(2) be heated to 950～1050 ℃, be incubated water-cooled after 1～3 minute, after circular treatment 3～5 times, obtaining 6～9 grades grain fineness number.
2, according to the circulating phase-transition crystal grain thinning technology of the described micro-boron cobalt-free maraging steel of claim 1, it is characterized in that: in the described step (1), when no thick boride is separated out, directly carry out the technology of back.
3, according to the circulating phase-transition crystal grain thinning technology of the described micro-boron cobalt-free maraging steel of claim 1, it is characterized in that: described step 2), adopt rapid heating, rate of heating 〉=10 ℃/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100110453A CN101560592B (en) | 2008-04-16 | 2008-04-16 | Circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel |
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| CN2008100110453A CN101560592B (en) | 2008-04-16 | 2008-04-16 | Circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel |
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| CN101560592A true CN101560592A (en) | 2009-10-21 |
| CN101560592B CN101560592B (en) | 2010-12-22 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978359A (en) * | 2012-12-21 | 2013-03-20 | 贵州大学 | Variable-temperature circular treatment method of ultrafine C250 maraging steel grains |
| CN105838862A (en) * | 2016-05-26 | 2016-08-10 | 中国科学院金属研究所 | Method for refining grains of maraging stainless steel by cyclic phase transformation |
| CN107974626A (en) * | 2017-11-09 | 2018-05-01 | 苏州汉汽航空科技有限公司 | A kind of aviation high intensity parts are without cobalt green wood preparation method for material |
| CN113755677A (en) * | 2021-08-30 | 2021-12-07 | 中国科学院金属研究所 | Ultra-high strength and high toughness maraging steel with superfine substructure and preparation method thereof |
| CN113930597A (en) * | 2021-10-15 | 2022-01-14 | 常州大学 | Preparation process of 22MnB5 steel ultrafine grain microstructure |
-
2008
- 2008-04-16 CN CN2008100110453A patent/CN101560592B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102978359A (en) * | 2012-12-21 | 2013-03-20 | 贵州大学 | Variable-temperature circular treatment method of ultrafine C250 maraging steel grains |
| CN105838862A (en) * | 2016-05-26 | 2016-08-10 | 中国科学院金属研究所 | Method for refining grains of maraging stainless steel by cyclic phase transformation |
| CN107974626A (en) * | 2017-11-09 | 2018-05-01 | 苏州汉汽航空科技有限公司 | A kind of aviation high intensity parts are without cobalt green wood preparation method for material |
| CN113755677A (en) * | 2021-08-30 | 2021-12-07 | 中国科学院金属研究所 | Ultra-high strength and high toughness maraging steel with superfine substructure and preparation method thereof |
| CN113930597A (en) * | 2021-10-15 | 2022-01-14 | 常州大学 | Preparation process of 22MnB5 steel ultrafine grain microstructure |
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| Publication number | Publication date |
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| CN101560592B (en) | 2010-12-22 |
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