CN106906337A - A kind of super-high strength steel strength-toughening treatment process - Google Patents
A kind of super-high strength steel strength-toughening treatment process Download PDFInfo
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- CN106906337A CN106906337A CN201710189265.4A CN201710189265A CN106906337A CN 106906337 A CN106906337 A CN 106906337A CN 201710189265 A CN201710189265 A CN 201710189265A CN 106906337 A CN106906337 A CN 106906337A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/185—Hardening; Quenching with or without subsequent tempering from an intercritical temperature
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/04—Hardening by cooling below 0 degrees Celsius
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of ultrafort steel strength-toughening treatment process, including step：Super-high strength steel is heated, and is cooled to room temperature；Critical area quenching, monophase field quenching；Repeat critical area quenching and monophase field quenches n times；Subzero treatment, temper；The present invention has effectively obstruction Crack Extension, is remarkably improved the obdurability of super-high strength steel, meets the demand of premium quality product and chooses different temperatures and ageing, obtains the advantage of suitable combination of strength and toughness.
Description
Technical field
The present invention relates to process for making, more particularly to a kind of ultrafort steel strength-toughening treatment process.
Background technology
AerMet Series Steels are Carpenter technology companys of the U.S. on the basis of Secondery-hardening Ultrahigh Strength Steel AF1410
The Fe-Ni-Co systems unimach developed.Opened to AerMet 340 etc. again by initial AerMet 100 to AerMet 310
Have issued a series of steel grades.The series alloy steel has superhigh intensity and excellent toughness, is provided simultaneously with crack growth rate low, disconnected
Toughness advantage high is split, high stress and heavy shock loads can be born, be widely used in military equipment and aviation field, such as aircraft is big
Beam, undercarriage, engine spindle etc..Unimach is the indispensable structural material of aviation field, today and it is contemplated that
Future all will be a kind of critical material.
As aviation and the development of war industry, particularly Aero-Space component use durability damages tolerance design criterion
Afterwards, requirements at the higher level are proposed to further elevating ultrahigh strength steel obdurability.In the case of AerMet Series Steel components unchangeds, its
Obdurability largely heat-treated technogenic influence.The serial super-high strength steel is due to containing the valuable strategic unit such as a large amount of Co, Ni
Element, it is costly, and how on the basis of manufacturing cost is not improved, by rational Technology for Heating Processing, further to improve
Its obdurability just seems very necessary.Therefore, at present in the urgent need to developing a kind of strength-toughening treatment process of novel super-high strength steel.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of ultrafort steel strength-toughening treatment process, can：
A () structure refinement, obtains " lath martensite+adverse transformation austenite+carbide " line and staff control, effectively hinder Crack Extension, shows
Write the obdurability for improving super-high strength steel；B () obdurability is improved, by introducing cryogenic treatment process, improve toughness and keep high simultaneously
Intensity；C (), according to different occasions to the demand of performance, process controllability enhancing further improves its obdurability, meets high-performance
The demand of product.
In order to achieve the above object, technical scheme provided by the present invention is:
A kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：Super-high strength steel is heated to 1150~1200 DEG C and is diffused treatment, is incubated 18~24 hours, then cooling
The tissue based on martensite is obtained to room temperature；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 680~
740 DEG C of two-phase sections, are incubated 0.5~1 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " mixing immediately afterwards
Tissue；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
850~890 DEG C of monophase field quenchings, are incubated 0.5~1 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 3 n times (n >=0), obtains refining lath martensite tissue；
Step 5：The refinement lath martensite tissue that will be obtained in step 4 is cooled to -196 DEG C, insulation 1~2 through liquid nitrogen
Hour, return warm to room temperature afterwards, obtain uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 carries out 470~550 DEG C
Temper, is incubated 3~5 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
Super-high strength steel in described step one, chemical composition is：Carbon content C=0.25~0.35%, nickel content Ni=
11~12%, cobalt content Co=13~16%, chromium content Cr=2~3%, molybdenum content Mo=1~2%, simultaneously micro- containing other
Secondary element (Mn, Si), balance of iron Fe.
In described step one be cooled to the mode of room temperature for mist is cold and oil cooling in one kind.
Beneficial effects of the present invention：
1st, critical area quenching (heating-up temperature is relatively low, sees Fig. 1 steps [2]) is first carried out, orientation relationship is obtained entirely different
Liang Zhongmashi bluk recombination tissues：" newborn martensite+original martensite "；(heating-up temperature is higher, sees figure to carry out monophase field quenching again
1 step [3]), now, two kinds of different martensites can hinder Austenite Grain Growth, finally give fine microstructures, orientation relationship
Lath martensite, effectively hinder Crack Extension, be remarkably improved the obdurability of super-high strength steel；
2nd, multiple circular treatment (see Fig. 1 dotted line frames) is carried out to step 2 and step 3, lath martensite can be significantly refined
Tissue, further to improve super-high strength steel obdurability, meets the demand of premium quality product；
3rd, the temperature of regulation and control step 6 and time, adverse transformation austenite and carbide precipitate content are controlled,
Different temperatures and ageing are chosen, suitable combination of strength and toughness is obtained, different occasion demands are met.
Brief description of the drawings
Fig. 1 is process schematic representation of the invention.
Specific embodiment
Embodiment 1
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：The super-high strength steels of AerMet 310 are heated to 1150 DEG C and are diffused treatment, are incubated 18 hours, then cooling
The tissue based on martensite is obtained to room temperature；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 680 DEG C two
Phase region, is incubated 0.5 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
850 DEG C of monophase field quenchings, are incubated 0.5 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 30 time (n >=0)；
Step 5：Lath martensite tissue is cooled to -196 DEG C through liquid nitrogen, 1 hour is incubated, is returned warm to room temperature afterwards, obtained
To uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 470 DEG C of tempering
Reason, is incubated 3 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
" tiny lath martensite+converes instruction+a small amount of carbide " line and staff control that obtains in embodiment 1 carries out power
Performance test is learned, yield strength is：2085MPa, power resistance strength are：2380MPa, ballistic work (- 196 DEG C) are：20J.
Embodiment 2
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：Super-high strength steel is heated to 1180 DEG C and is diffused treatment, is incubated 20 hours, is then cooled to room temperature and obtains
Tissue based on martensite；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 700 DEG C two
Phase region, is incubated 45 minutes, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
870 DEG C of monophase field quenchings, are incubated 45 minutes, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 30 time；
Step 5：The lath martensite tissue that will be obtained is cooled to -196 DEG C through liquid nitrogen, is incubated 1.5 hours, rises again afterwards
To room temperature, uniform tiny lath martensite tissue is obtained；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 510 DEG C of tempering
Reason, is incubated 4 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
" tiny lath martensite+converes instruction+a small amount of carbide " line and staff control that obtains to being obtained in embodiment 2 enters
Row Mechanics Performance Testing, yield strength is：2095MPa, power resistance strength are：2410MPa, ballistic work (- 196 DEG C) are：20.5J.
Embodiment 3
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：The super-high strength steels of AerMet 100 are heated to 1200 DEG C and are diffused treatment, are incubated 24 hours, then cooling
The tissue based on martensite is obtained to room temperature；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 740 DEG C two
Phase region, is incubated 1 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
890 DEG C of monophase field quenchings, are incubated 1 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 30 time (n >=0)；
Step 5：Lath martensite tissue is cooled to -196 DEG C through liquid nitrogen, is incubated 2 hours, returns warm to room temperature afterwards, obtains
Uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 550 DEG C of tempering
Reason, is incubated 5 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
The mechanics of " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control to being obtained in embodiment 3
Performance is tested, and yield strength is：2140MPa, power resistance strength are：2460MPa, ballistic work (- 196 DEG C) are：22J.
Embodiment 4
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：The super-high strength steels of AerMet 310 are diffused treatment to 1150 DEG C, are incubated 18 hours, are then cooled to room
Temperature obtains the tissue based on martensite；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 680 DEG C two
Phase region, is incubated 0.5 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
850 DEG C of monophase field quenchings, are incubated 0.5 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 31 time, obtains refining lath martensite tissue；
Step 5：The refinement lath martensite tissue that will be obtained in step 4 is cooled to -196 DEG C through liquid nitrogen, and insulation 1 is small
When, return warm to room temperature afterwards, obtain uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 470 DEG C of tempering
Reason, is incubated 3 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
Mechanical property to embodiment 4 " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control is carried out
Test, yield strength is：2115MPa, power resistance strength are：2420MPa, ballistic work (- 196 DEG C) are：19J.
Embodiment 5
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：The super-high strength steels of AerMet 310 are heated to 1185 DEG C and are diffused treatment, are incubated 22 hours, then cooling
The tissue based on martensite is obtained to room temperature；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 710 DEG C two
Phase region, is incubated 45 minutes, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
870 DEG C of monophase field quenchings, are incubated 45 minutes, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 31 time, obtains refining lath martensite tissue；
Step 5：The refinement lath martensite tissue that will be obtained in step 4 is cooled to -196 DEG C through liquid nitrogen, and insulation 1.5 is small
When, return warm to room temperature afterwards, obtain uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 510 DEG C of tempering
Reason, is incubated 4 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
" tiny lath martensite+converes instruction+a small amount of carbide " line and staff control is obtained to what is obtained in embodiment 5
Mechanical property is tested, and yield strength is：2135MPa, power resistance strength are：2455MPa, ballistic work (- 196 DEG C) are：20J.
Embodiment 6
Reference picture 1, a kind of ultrafort steel strength-toughening treatment process, its step is：
Step one：The super-high strength steels of AerMet 310 are heated to 1200 DEG C and are diffused treatment, are incubated 24 hours, then cooling
The tissue based on martensite is obtained to room temperature；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 740 DEG C two
Phase region, is incubated 1 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：" newborn martensite+original martensite " line and staff control will be obtained in step 2 to be carried out
890 DEG C of monophase field quenchings, are incubated 1 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 31 time, obtains refining lath martensite tissue；
Step 5：The refinement lath martensite tissue that will be obtained in step 4 is cooled to -196 DEG C through liquid nitrogen, and insulation 2 is small
When, return warm to room temperature afterwards, obtain uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 to be carried out at 550 DEG C of tempering
Reason, is incubated 5 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
The mechanical property of " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control is obtained to embodiment 6
Tested, yield strength is：2180MPa, power resistance strength are：2495MPa, ballistic work (- 196 DEG C) are：21J.
Claims (3)
1. a kind of ultrafort steel strength-toughening treatment process, it is characterised in that its step is：
Step one：Super-high strength steel is heated to 1150~1200 DEG C and is diffused treatment, is incubated 18~24 hours, is then cooled to room
Temperature obtains the tissue based on martensite；
Step 2：Critical area quenching：The tissue based on martensite that will be obtained in step one is reheated to 680~740 DEG C
Two-phase section, is incubated 0.5~1 hour, and oil quenching, to room temperature, obtains " newborn martensite+original martensite " line and staff control immediately afterwards；
Step 3：Monophase field quenches：To be obtained in step 2 " newborn martensite+original martensite " line and staff control carry out 850~
890 DEG C of monophase field quenchings, are incubated 0.5~1 hour, and oil quenching obtains lath martensite tissue to room temperature afterwards；
Step 4：Repeat the above steps two and step 3 n times (n >=0), obtains refining lath martensite tissue；
Step 5：Subzero treatment：The refinement lath martensite tissue that will be obtained in step 4 is cooled to -196 DEG C, insulation through liquid nitrogen
1~2 hour, return warm to room temperature afterwards, obtain uniform tiny lath martensite tissue；
Step 6：Temper：Uniform tiny lath martensite tissue will be obtained in step 5 carries out 470~550 DEG C of tempering
Treatment, is incubated 3~5 hours, obtains " tiny lath martensite+converes instruction+a small amount of carbide " line and staff control.
2. a kind of ultrafort steel strength-toughening treatment process according to claim 1, it is characterised in that in described step one
Super-high strength steel, chemical composition is：Carbon content C=0.25~0.35%, nickel content Ni=11~12%, cobalt content Co=13~
16%th, chromium content Cr=2~3%, molybdenum content Mo=1~2%, contain other micro- (Mn, Si), balance of iron simultaneously
Fe。
3. a kind of ultrafort steel strength-toughening treatment process according to claim 1, it is characterised in that in described step one
Be cooled to the mode of room temperature for mist is cold and oil cooling in one kind.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107881308A (en) * | 2017-11-01 | 2018-04-06 | 西南大学 | A kind of cryogenic treatment process of the quenched steel toughness of raising 50CrVA |
| CN109852779A (en) * | 2019-03-04 | 2019-06-07 | 内蒙金属材料研究所 | A kind of heat treatment method of civilian bullet proof steel |
| CN110468263A (en) * | 2019-09-12 | 2019-11-19 | 北京理工大学 | A kind for the treatment of process obtaining the advanced high-strength steel of high-strength and high ductility |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107881308A (en) * | 2017-11-01 | 2018-04-06 | 西南大学 | A kind of cryogenic treatment process of the quenched steel toughness of raising 50CrVA |
| CN107881308B (en) * | 2017-11-01 | 2019-08-16 | 西南大学 | A kind of cryogenic treatment process improving the quenched steel toughness of 50CrVA |
| CN109852779A (en) * | 2019-03-04 | 2019-06-07 | 内蒙金属材料研究所 | A kind of heat treatment method of civilian bullet proof steel |
| CN110468263A (en) * | 2019-09-12 | 2019-11-19 | 北京理工大学 | A kind for the treatment of process obtaining the advanced high-strength steel of high-strength and high ductility |
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| CN106906337B (en) | 2019-01-25 |
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