CN106119492B - A kind of hot-working method of fusion reactor commercial scale low activation martensitic steel sheet material - Google Patents

A kind of hot-working method of fusion reactor commercial scale low activation martensitic steel sheet material Download PDF

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CN106119492B
CN106119492B CN201610715359.6A CN201610715359A CN106119492B CN 106119492 B CN106119492 B CN 106119492B CN 201610715359 A CN201610715359 A CN 201610715359A CN 106119492 B CN106119492 B CN 106119492B
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forging
low activation
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sheet material
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CN106119492A (en
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徐刚
吴宜灿
黄群英
王伟
刘少军
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Hefei Institutes of Physical Science of CAS
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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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working

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Abstract

The present invention discloses a kind of hot-working method of fusion reactor commercial scale low activation martensitic steel sheet material, and the ingot casting smelted is heated into 1,180 1280 DEG C first and is diffused annealing, 1150 ± 20 DEG C are cooled to afterwards and is forged.Blank is slowly cooled to less than 100 DEG C after the completion of forging, then carries out 760 ± 10 DEG C/6 20h tempers.Gained blank is rolled after being incubated 80 100min at 1,050 1160 DEG C, and 740 ± 20 DEG C/90 140min tempers are directly carried out after air cooling.Present invention optimizes the forging technology of commercial scale low activation martensitic steel, and the method being combined is handled using Direct Air-Cooled processing and high tempering after hot rolling, the solution hardening handling process of hot rolled plate is eliminated, is saved time and cost, while making material that there is preferable intensity, toughness.

Description

A kind of hot-working method of fusion reactor commercial scale low activation martensitic steel sheet material
Technical field
The present invention relates to a kind of hot-working method of material, belong to metal material and be modified and plastic forming field.
Background technology
The Service Environment of nuclear fusion stack covering is more severe more than nuclear fission, and the structural material of fusion reactor blanket faces high energy Neutron irradiation (14MeV), high temperature, high heat flux (>1MW/m2), complicated machinery load and liquid metal corrosion etc. it is a variety of multiple The synergy in heterocycle border.Low activation ferrite/martensite steel (RAFM steel) is with its higher thermal conductivity, relatively low void swelling Superiority and the more ripe industrial foundation such as corrode with anti-liquid Pb Li, be generally considered the preferred structural wood of fusion reactor Material.Since 2002, the Chinese low anti-neutron irradiation structural steel of activation that Chinese Academy of Sciences's nuclear energy Research on Security Technology is researched and developed CLAM (China Low Activation Martensitic) steel (ZL 200610085908.2) has been carried out more than 100 heats Smelting, carried out the exploration of sublimate smelting process, smelting level has developed to hundreds of feather weight, major design composition content base Originally stably and controllable level has been reached, and has been manufactured that various sheet materials.Although the CLAM processing technologys of hundreds of feather weight are advised to industry Producing for mould (more than 6 tons) CLAM steel boards has certain reference significance, but the large-sized CLAM steel ingot casting of commercial scale In the presence of more serious segregation and the inhomogeneities of structure property, former processing technology is continued to use, the yield strength of material is 460MPa, it is 130J that room temperature impact, which absorbs work(, is unsatisfactory for the use requirement of fusion reactor design.
The content of the invention
The problem of existing for commercial scale large scale low activation martensitic steel plate processing technology, the purpose of the present invention is A kind of fusion reactor commercial scale low activation martensitic steel plate hot rolled plate processing method is provided, by have adjusted blank forging work Skill and sheet material heat processing technique so that the design that each performance of commercial scale large scale low activation martensitic steel plate meets fusion reactor will Ask, also be adapted for the application in fission-type reactor.
Technical scheme is as follows：
A kind of fusion reactor commercial scale low activation martensitic steel hot rolled plate hot-working method, its main component is Cr 8.5~9.5%, W 1.2~1.7%, V 0.15~0.25%, Ta 0.12~0.18%, Mn 0.4~0.5%, C 0.8~ 1.2%, remaining is Fe elements.By this composition proportion, melting is carried out to furnace charge in vaccum sensitive stove:(1) vacuum 0.1- 10Pa applying argon gas are to 0.005-0.08MPA, 1450~1650 DEG C of fusion temperature；(2) material alloying order, melts pure Fe first, Then Cr, W are added, Ta, V is subsequently added into, C, Mn is finally added, while regarding oxygen levels in pure iron, being added before Cr is added A small amount of C carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result augment alloying element；(4) into division Poured into a mould under vacuo after lattice, 1450~1550 DEG C of pouring temperature.The 6 tons of diameter above obtained are the tool after 400-800mm ingot castings Body processing technology is as follows：
(1) blank forging technique：By ingot casting after 1180-1280 DEG C of insulation 25-45h diffusion annealings, it is cooled to 1150 ± 20 DEG C and it is incubated after 1-5h and is forged, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reburn the time >=30min； Blank is slowly cooled to less than 100 DEG C after the completion of forging, then carries out 760 ± 10 DEG C/6-20h tempers, hot rolled plate is obtained The forging blank of material.
(2) rolled after blank being incubated into 80-100min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%, Quenching Treatment is not done after rolled plate air cooling, directly carries out 740 ± 20 DEG C/90-140min tempers, you can obtain Obtain finished product sheet material.
The present invention is suitable to processing of more than the 6 tons thickness in 40-100mm commercial scale low activation martensitic steel hot rolled plates.
Advantage of the invention compared with existing low activation martensitic steel sheet material heat processing technique is：
(1) by it is long when high temperature diffusion annealing, it is ensured that the abundant solid solution of alloying element, be particularly suitable for use in high Ta contents Low activation steel, improves the homogeneity of ingredients of the big ingot casting of commercial scale.
(2) by rolling direct tempering after air cooling, Quenching Treatment link is eliminated, time and cost has been saved.
(3) present invention is by high temperature rolling thermomechanical treatment process, and crystal grain thinning can make the low activation geneva of commercial scale Body steel board has good room temperature strength and toughness and high temperature endurance performance.Its room-temperature mechanical property is：Yield strength Rp0.2 >=530MPa, tensile strength plate Rm>=690MPa, elongation percentage A >=20%, contraction percentage of area Z >=70%；Side knock work(and vertical To ballistic work Akv≥220J.Duration under 550 DEG C, 190MPa stress conditions is more than 2000h, elongation percentage A >=25%, this A little performances are satisfied by the design requirement of fusion reactor, also are adapted for the application in fission-type reactor.
Embodiment
Embodiment 1
A kind of low activation martensitic steel for fusion reactor, its main component is Cr 9%, W 1.5%, V 0.20%, Ta 0.15%, Mn 0.45%, C 1.0%, remaining is Fe elements.By this composition proportion, furnace charge is melted in vaccum sensitive stove Refining:(1) vacuum 0.1-10Pa applying argon gas are to 0.005-0.08MPa, 1450~1650 DEG C of fusion temperature；(2) material alloying is suitable Sequence, melts pure Fe first, then adds Cr, W, is subsequently added into Ta, V, finally adds C, Mn, while regarding oxygen content water in pure iron It is flat, a small amount of C is added before Cr is added and carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result supplement Alloying element；(4) poured into a mould under vacuo after composition is qualified, 1450~1550 DEG C of pouring temperature.Obtain 6 tons of diameter above be 400mm ingot casting
(1) blank forging technique：
1) heat：1180-1280 DEG C of insulation 25h diffusion annealings are carried out to ingot casting, furnace temperature is no more than 600 DEG C when entering stove, applies Row order ladder type heats up, and heating rate is no more than 50 DEG C/h, and diffusion annealing is furnace-cooled to 1150 ± 20 DEG C and is incubated 2h after terminating；
2) forge, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reheating in furnace time >=30min；
3) anneal：Blank is put into unheated annealing furnace after the completion of forging and slowly cools to less than 100 DEG C, at the beginning of annealing furnace Beginning temperature is no more than 200 DEG C；
4) it is tempered：Blank is subjected to heating 760 ± 10 DEG C/8h tempers again, tempering furnace initial temperature is no more than 100 DEG C, heating rate is no more than 120 DEG C/h, and tempering insulation cools to less than 400 DEG C air coolings of coming out of the stove with the furnace after terminating, obtains hot rolled plate The forging blank of material.
(2) sheet material hot-working：
1) hot rolling：Rolled after blank is incubated into 80min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%；
2) it is heat-treated：Quenching Treatment is not done after rolled plate air cooling, 740 ± 20 DEG C/100min tempers are directly carried out, Tempering furnace initial temperature is no more than 100 DEG C, and heating rate is no more than 120 DEG C/h, and air cooling of directly being come out of the stove after tempering can be obtained into Product sheet material.
(3) performance test is carried out to gained steel plate, obtains the room-temperature yield strength R of steel plate diverse locationp0.2It is all higher than 530MPa, elongation percentage A is more than 25%, side knock work(and impact of collision work(AkvIt is above 220J；At 550 DEG C, 190MPa should Duration under the conditions of power is more than 2000h.
Embodiment 2
A kind of low activation martensitic steel for fusion reactor, its main component is Cr 9%, W 1.5%, V 0.20%, Ta 0.15%, Mn 0.45%, C 1.0%, remaining is Fe elements.By this composition proportion, furnace charge is melted in vaccum sensitive stove Refining:(1) vacuum 0.1-10Pa applying argon gas are to 0.005-0.08MPa, 1450~1650 DEG C of fusion temperature；(2) material alloying is suitable Sequence, melts pure Fe first, then adds Cr, W, is subsequently added into Ta, V, finally adds C, Mn, while regarding oxygen content water in pure iron It is flat, a small amount of C is added before Cr is added and carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result supplement Alloying element；(4) poured into a mould under vacuo after composition is qualified, 1450~1550 DEG C of pouring temperature.Obtain 6 tons of diameter above be 600mm ingot casting.
(1) blank forging technique：
1) heat：1180-1280 DEG C of insulation 32h diffusion annealings are carried out to ingot casting, furnace temperature is no more than 600 DEG C when entering stove, applies Row order ladder type heats up, and heating rate is no more than 50 DEG C/h, and diffusion annealing is furnace-cooled to 1150 ± 20 DEG C and is incubated 3h after terminating；
2) forge, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reheating in furnace time >=30min；
3) anneal：Blank is put into unheated annealing furnace after the completion of forging and slowly cools to less than 100 DEG C, at the beginning of annealing furnace Beginning temperature is no more than 200 DEG C；
4) it is tempered：Blank is subjected to heating 760 ± 10 DEG C/12h tempers again, tempering furnace initial temperature is no more than 100 DEG C, heating rate is no more than 120 DEG C/h, and tempering insulation cools to less than 400 DEG C air coolings of coming out of the stove with the furnace after terminating, obtains hot rolled plate The forging blank of material.
(2) sheet material hot-working：
1) hot rolling：Rolled after blank is incubated into 90min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%；
2) it is heat-treated：Quenching Treatment is not done after rolled plate air cooling, 740 ± 20 DEG C/120min tempers are directly carried out, Tempering furnace initial temperature is no more than 100 DEG C, and heating rate is no more than 120 DEG C/h, and air cooling of directly being come out of the stove after tempering can be obtained into Product sheet material.
(3) performance test is carried out to gained steel plate, obtains the room-temperature yield strength R of steel plate diverse locationp0.2It is all higher than 530MPa, elongation percentage A is more than 25%, side knock work(and impact of collision work(AkvIt is above 220J；At 550 DEG C, 190MPa should Duration under the conditions of power is more than 2000h.
Embodiment 3：
A kind of low activation martensitic steel for fusion reactor, its main component is Cr 9%, W 1.5%, V 0.20%, Ta 0.15%, Mn 0.45%, C 1.0%, remaining is Fe elements.By this composition proportion, furnace charge is melted in vaccum sensitive stove Refining:(1) vacuum 0.1-10Pa applying argon gas are to 0.005-0.08MPa, 1450~1650 DEG C of fusion temperature；(2) material alloying is suitable Sequence, melts pure Fe first, then adds Cr, W, is subsequently added into Ta, V, finally adds C, Mn, while regarding oxygen content water in pure iron It is flat, a small amount of C is added before Cr is added and carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result supplement Alloying element；(4) poured into a mould under vacuo after composition is qualified, 1450~1550 DEG C of pouring temperature.Obtain 6 tons of diameter above be 800mm ingot casting
(1) blank forging technique：
1) heat：1180-1280 DEG C of insulation 40h diffusion annealings are carried out to ingot casting, furnace temperature is no more than 600 DEG C when entering stove, applies Row order ladder type heats up, and heating rate is no more than 50 DEG C/h, and diffusion annealing is furnace-cooled to 1150 ± 20 DEG C and is incubated 4.5h after terminating；
2) forge, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reheating in furnace time >=30min；
3) anneal：Blank is put into unheated annealing furnace after the completion of forging and slowly cools to less than 100 DEG C, at the beginning of annealing furnace Beginning temperature is no more than 200 DEG C；
4) it is tempered：Blank is subjected to heating 760 ± 10 DEG C/15h tempers again, tempering furnace initial temperature is no more than 100 DEG C, heating rate is no more than 120 DEG C/h, and tempering insulation cools to less than 400 DEG C air coolings of coming out of the stove with the furnace after terminating, obtains hot rolled plate The forging blank of material.
(2) sheet material hot-working：
1) hot rolling：Rolled after blank is incubated into 100min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%；
2) it is heat-treated：Quenching Treatment is not done after rolled plate air cooling, 740 ± 20 DEG C/130min tempers are directly carried out, Tempering furnace initial temperature is no more than 100 DEG C, and heating rate is no more than 120 DEG C/h, and air cooling of directly being come out of the stove after tempering can be obtained into Product sheet material.
(3) performance test is carried out to gained steel plate, obtains the room-temperature yield strength R of steel plate diverse locationp0.2It is all higher than 530MPa, elongation percentage A is more than 25%, side knock work(and impact of collision work(AkvIt is above 220J；At 550 DEG C, 190MPa should Duration under the conditions of power is more than 2000h.
Embodiment 4：
A kind of low activation martensitic steel for fusion reactor, its main component is Cr 8.8%, W 1.5%, V 0.20%, Ta 0.18%, Mn 0.5%, C 1.0%, remaining is Fe elements.By this composition proportion, furnace charge is melted in vaccum sensitive stove Refining:(1) vacuum 0.1-10Pa applying argon gas are to 0.005-0.08MPa, 1450~1650 DEG C of fusion temperature；(2) material alloying is suitable Sequence, melts pure Fe first, then adds Cr, W, is subsequently added into Ta, V, finally adds C, Mn, while regarding oxygen content water in pure iron It is flat, a small amount of C is added before Cr is added and carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result supplement Alloying element；(4) poured into a mould under vacuo after composition is qualified, 1450~1550 DEG C of pouring temperature.Obtain 6 tons of diameter above be 400mm ingot casting.
(1) blank forging technique：
1) heat：1180-1280 DEG C of insulation 25h diffusion annealings are carried out to ingot casting, furnace temperature is no more than 600 DEG C when entering stove, applies Row order ladder type heats up, and heating rate is no more than 50 DEG C/h, and diffusion annealing is furnace-cooled to 1150 ± 20 DEG C and is incubated 2h after terminating；
2) forge, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reheating in furnace time >=30min；
3) anneal：Blank is put into unheated annealing furnace after the completion of forging and slowly cools to less than 100 DEG C, at the beginning of annealing furnace Beginning temperature is no more than 200 DEG C；
4) it is tempered：Blank is subjected to heating 760 ± 10 DEG C/8h tempers again, tempering furnace initial temperature is no more than 100 DEG C, heating rate is no more than 120 DEG C/h, and tempering insulation cools to less than 400 DEG C air coolings of coming out of the stove with the furnace after terminating, obtains hot rolled plate The forging blank of material.
(2) sheet material hot-working：
1) hot rolling：Rolled after blank is incubated into 80min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%；
2) it is heat-treated：Quenching Treatment is not done after rolled plate air cooling, 740 ± 20 DEG C/100min tempers are directly carried out, Tempering furnace initial temperature is no more than 100 DEG C, and heating rate is no more than 120 DEG C/h, and air cooling of directly being come out of the stove after tempering can be obtained into Product sheet material.
(3) performance test is carried out to gained steel plate, obtains the room-temperature yield strength R of steel plate diverse locationp0.2It is all higher than 550MPa, elongation percentage A is more than 21%, side knock work(and impact of collision work(AkvIt is above 220J；At 550 DEG C, 190MPa should Duration under the conditions of power is more than 2000h.
Embodiment 5：
A kind of low activation martensitic steel for fusion reactor, its main component is Cr 8.8%, W 1.5%, V 0.20%, Ta 0.18%, Mn 0.5%, C 1.0%, remaining is Fe elements.By this composition proportion, furnace charge is melted in vaccum sensitive stove Refining:(1) vacuum 0.1-10Pa applying argon gas are to 0.005-0.08MPa, 1450~1650 DEG C of fusion temperature；(2) material alloying is suitable Sequence, melts pure Fe first, then adds Cr, W, is subsequently added into Ta, V, finally adds C, Mn, while regarding oxygen content water in pure iron It is flat, a small amount of C is added before Cr is added and carries out deoxidation treatment；(3) on-line checking alloy element component and according to test result supplement Alloying element；(4) poured into a mould under vacuo after composition is qualified, 1450~1550 DEG C of pouring temperature.Obtain 6 tons of diameter above be 800mm ingot casting.
(1) blank forging technique：
1) heat：1180-1280 DEG C of insulation 40h diffusion annealings are carried out to ingot casting, furnace temperature is no more than 600 DEG C when entering stove, applies Row order ladder type heats up, and heating rate is no more than 50 DEG C/h, and diffusion annealing is furnace-cooled to 1150 ± 20 DEG C and is incubated 4.5h after terminating；
2) forge, starting forging temperature：≥1050℃；Final forging temperature：>=850 DEG C, reheating in furnace time >=30min；
3) anneal：Blank is put into unheated annealing furnace after the completion of forging and slowly cools to less than 100 DEG C, at the beginning of annealing furnace Beginning temperature is no more than 200 DEG C；
4) it is tempered：Blank is subjected to heating 760 ± 10 DEG C/15h tempers again, tempering furnace initial temperature is no more than 100 DEG C, heating rate is no more than 120 DEG C/h, and tempering insulation cools to less than 400 DEG C air coolings of coming out of the stove with the furnace after terminating, obtains hot rolled plate The forging blank of material.
(2) sheet material hot-working：
1) hot rolling：Rolled after blank is incubated into 100min at 1050-1160 DEG C, finishing temperature >=900 DEG C, deflection >=400%；
2) it is heat-treated：Quenching Treatment is not done after rolled plate air cooling, 740 ± 20 DEG C/130min tempers are directly carried out, Tempering furnace initial temperature is no more than 100 DEG C, and heating rate is no more than 120 DEG C/h, and air cooling of directly being come out of the stove after tempering can be obtained into Product sheet material.
(3) performance test is carried out to gained steel plate, obtains the room-temperature yield strength R of steel plate diverse locationp0.2It is all higher than 540MPa, elongation percentage A is more than 22%, side knock work(and impact of collision work(AkvIt is above 235J；At 550 DEG C, 190MPa should Duration under the conditions of power is more than 2000h.

Claims (3)

1. a kind of fusion reactor hot-working method of commercial scale low activation martensitic steel sheet material, it is characterised in that：To fusion reactor Carried out with commercial scale low activation martensitic steel ingot casting after 1180-1280 DEG C of insulation 25-45h diffusion annealings, it is cooled to 1150 ± 20 DEG C and be incubated after 1-5h and forged, blank is slowly cooled to less than 100 DEG C after the completion of forging, then carry out 760 ± 10 DEG C/ 6-20h tempers, obtain the forging blank of hot rolled plate, are rolled after blank is incubated into 80-100min at 1050-1160 DEG C Quenching Treatment is not done after system, rolled plate air cooling, 740 ± 20 DEG C/90-140min tempers are directly carried out, you can obtain into Product sheet material.
2. a kind of hot-working method of fusion reactor commercial scale low activation martensitic steel sheet material according to claim 1, It is characterized in that：Starting forging temperature >=1050 DEG C of forging, final forging temperature >=850 DEG C, reburn the time >=30min.
3. a kind of hot-working side of fusion reactor commercial scale low activation martensitic steel sheet material according to claim 1 or 2 Method, it is characterised in that：Finishing temperature >=900 DEG C of rolling, deflection >=400%.
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CN113355497B (en) * 2021-06-04 2022-05-31 西安建筑科技大学 Low-activation steel plate and preparation process thereof
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