CN104651589B - Process for hot deformation of fine 316LN austenite stainless steel grains - Google Patents
Process for hot deformation of fine 316LN austenite stainless steel grains Download PDFInfo
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- CN104651589B CN104651589B CN201510061910.5A CN201510061910A CN104651589B CN 104651589 B CN104651589 B CN 104651589B CN 201510061910 A CN201510061910 A CN 201510061910A CN 104651589 B CN104651589 B CN 104651589B
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Abstract
The invention provides a process for hot deformation of refined 316LN austenite stainless steel grains, belonging to the field of heat processing technology. The process for the hot deformation of the fine 316LN austenite stainless steel grains comprises the following steps: carrying out solid solution treatment of 316LN austenite stainless steel; and deforming the material by controlling the deformation speed and the deformation amount under the temperature of 1050-1100 DEG C to obtain homogeneous fine dynamic recrystallized grains according to a dtnamic recrystallization theory. The process for the hot deformation of the fine 316LN austenite stainless steel grains disclosed by the invention is easy to control and achieves the purpose of homogeneous recrystallization of austenite through the control of the deformation temperature, deformation speed and deformation amount; meanwhile, the problem of abnormal growth of grains is solved, the process flow is shortened, and the efficiency fine 316LN grains are greatly improved; and the average grain size of the hot deformed austenite is about 11 mu m, and the grain fineness is equal to or more than Grade 9.5.
Description
Technical field
The invention belongs to heat processing technique field, in particular, provide a kind of refinement 316LN austenite stainless crystalline grain of steel
Thermal deformation technique.
Background technology
Nuclear power is a kind of clean energy resource of technology maturation, and compared with thermoelectricity, nuclear power does not discharge sulfur dioxide, flue dust, nitrogen oxygen
Compound and carbon dioxide.Part coal electricity is substituted with nuclear power, is the effective way of power industry pollutant emission reduction, is also to slow down the earth
The important measures of greenhouse effect.Third generation AP1000 is at present state-of-the-art in the world to build commercial nuclear power plant, Main Coolant pipe
Road is one of seven big key equipments in nuclear island, is referred to as nuclear power station " aorta ".As the manufacture material of main pipeline, 316LN is difficult to understand
Family name's body rustless steel has excellent corrosion-resistant, toughness and mechanical behavior under high temperature.But 316LN austenitic stainless steel column crystal is flourishing,
Coarse grains, can deteriorate the performance of material.Crystal grain thinning can significantly improve the combination property of ferrous materials, plays it bigger
Construction value.Because 316LN austenitic stainless steel belongs to single phase austenite structure, there is no phase transformation it is impossible to change by heat treatment
Its tissue, the difficulty of therefore refinement 316LN austenite stainless crystalline grain of steel is larger.Generally refinement single phase austenite crystalline grain of steel has two kinds
Method：One kind is to add recrystallization annealing using cold deformation, and the method is mainly refined to crystal grain using Static Recrystallization, shortcoming
It is that during low-temperature deformation, material resistance of deformation is larger, easily cause the cracking of single phase austenite steel.Meanwhile, during recrystallization annealing
Material internal-external temperature difference is wayward, leads to recrystallization crystal particle dimension uneven.Furthermore, whole complex technical process, activity time
Long, it is unfavorable for saving；Another kind is to carry out thermal deformation in recrystallization temperature interval, in thermal deformation process occur Recrystallization nucleation and
Nuclei growth.The method is refined to crystal grain using dynamic recrystallization.The stacking fault energy of 316LN austenitic stainless steel is low, and heat becomes
It is susceptible to dynamic recrystallization, the technique of sharp crystal grain thinning in this way is simpler during shape, but due in thermal deformation process
The carrying out that temperature, strain rate, dependent variable recrystallize on MATERIALS ' DYNAMIC affects very big, the easily non-perfect recrystallization of formation after deformation
" necklace structure " or perfect recrystallization after crystal grain grow up caused by coarse grains phenomenon, be difficult to be formed tiny, uniformly point
The grain structure of cloth, there is also many difficult points hence with this method crystal grain thinning.
Do not see at present and refine the patent of the stainless crystalline grain of steel of 316LN and open report using thermal deformation technique, refinement is other
The insulation that the method that the patent of austenite stainless crystalline grain of steel adopts is material through carrying out some time after cold rolling or hot rolling mostly.This
The class technique process time is long.For this reason, studying a kind of thermal deformation technique of refinement 316LN austenite stainless crystalline grain of steel, it is China the
The increased quality of three generations's AP1000 Nuclear power plant main pipeline and mass production provide technical support, are the current technology be badly in need of and solving
One of problem.
Content of the invention
It is an object of the invention to provide a kind of thermal deformation technique of refinement 316LN austenite stainless crystalline grain of steel, by becoming
The control of shape temperature, strain rate and dependent variable, has reached the purpose that austenite uniformly recrystallizes, and solves crystal grain abnormal simultaneously
The problem grown up.The originally thick crystal grain of 316LN austenitic stainless steel is made to become tiny and uniform using this technique.Austenite is put down
All about 11 μm of crystallite dimensions, autstenitic grain size >=9.5 grade.It is an advantage of the invention that controlling simple, process short, can be significantly
Degree improves the efficiency of 316LN crystalline grain of steel refinement.
A kind of thermal deformation technique of refinement 316LN austenite stainless crystalline grain of steel it is characterised in that：
316LN austenitic stainless steel after solution treatment is heated to 1200 DEG C with the speed of 10 DEG C/s, is incubated 60-120
Second.It is cooled to 1050-1100 DEG C with the speed of 5 DEG C/s, with 0.005- after insulation 5-10min after material internal and external temperature is uniform
0.05s-1Strain rate carry out hot compression.The temperature of this process remains constant, and dependent variable reaches taking-up material during 0.7-0.8
Water quenching, can obtain and recrystallize the abundant, austenite structure of fine uniform.
Described solution treatment is that 316LN austenitic stainless steel is placed in 1100-1200 DEG C of resistance furnace, is incubated 0.5-2
Water quenching after hour, obtains even tissue, thick austenite crystal.Described temperature retention time determines according to material thickness, every millimeter
Corresponding 2-3 minute temperature retention time.
The present invention compared with prior art has the advantage that and effect：
1. pass through the control of deformation temperature, strain rate and dependent variable, reach the purpose that austenite uniformly recrystallizes, with
When solve the problems, such as abnormal grain growth.
2. thermal deformation completes the thinning process of crystal grain when completing, and decreases the technological processes such as post bake, shortens
Operation, improves production efficiency.
3. heat distortion temperature is high, reduces the resistance of deformation of austenitic steel, be conducive to the carrying out deforming, it is to avoid material
Cracking.
4. the temperature in austenitic steel recrystallization process remains at 1050-1100 DEG C, it is to avoid because significantly lowering the temperature
With heat up the internal-external temperature difference that causes it is therefore prevented that recrystallized structure uneven.
Brief description
Fig. 1 is the 316LN austenitic stainless steel metallographic structure without micronization processes.Coarse grains and uneven, averagely crystalline substance
About 147 μm of particle size.
Fig. 2 is the metallographic structure in thermal deformation process.
Fig. 3 is metallographic structure when thermal deformation completes.
Specific embodiment
Embodiment 1
The 316LN austenitic stainless steel for 30mm for the thickness is put in 1100 DEG C of resistance furnace, water quenching after being incubated 1 hour,
Obtain even tissue, thick austenite crystal.Then material is cut into the cylindrical specimens of Φ 8mm × 12mm.Sample is put
Enter in Gleeble-1500D thermal simulation experiment machine, 1200 DEG C of insulation 60s are heated to 10 DEG C/s speed, then with 5 DEG C/s cooling rate fall
It is compressed to 0.7 dependent variable with 0.01 strain rate to 1100 DEG C of insulation 5min.Period temperature keeps constant, and deformation finishes
Water quenching afterwards.Metallographic structure in sample thermal deformation process is as shown in Fig. 2 the metallographic structure after the completion of thermal deformation is as shown in Figure 3.Carefully
After change is processed, uniform small grains, about 10.5 μm of average grain size.
Embodiment 2
The 316LN austenitic stainless steel for 50mm for the thickness is put in 1150 DEG C of resistance furnace, water quenching after being incubated 2 hours,
Obtain even tissue, thick austenite crystal.Then material is cut into the cylindrical specimens of Φ 8mm × 12mm.Sample is put
Enter in Gleeble-1500D thermal simulation experiment machine, 1200 DEG C of insulation 90s are heated to 10 DEG C/s speed, then with 5 DEG C/s cooling rate fall
It is compressed to 0.8 dependent variable with 0.03 strain rate to 1080 DEG C of insulation 7min.Period temperature keeps constant, and deformation finishes
Water quenching afterwards.After micronization processes, uniform small grains, about 11.2 μm of average grain size.
Embodiment 3
316LN austenitic stainless steel is put in 1200 DEG C of resistance furnace, water quenching after being incubated 1.5 hours, obtain tissue all
Even, thick austenite crystal.Then material is cut into the cylindrical specimens of Φ 8mm × 12mm.Sample is put into Gleeble-
In 1500D thermal simulation experiment machine, 1200 DEG C of insulation 115s are heated to 10 DEG C/s speed, then are down to 1050 DEG C with 5 DEG C/s cooling rate
Slowly it is compressed to 0.7 dependent variable with 0.008 strain rate after insulation 10min.Period temperature keeps constant, after deformation finishes
Water quenching.After micronization processes, uniform small grains, about 10.7 μm of average grain size.
Claims (1)
1. a kind of thermal deformation technique of refinement 316LN austenite stainless crystalline grain of steel it is characterised in that：
316LN austenitic stainless steel after solution treatment is heated to 1200 DEG C with the speed of 10 DEG C/s, is incubated 90 seconds；In material
It is cooled to 1080 DEG C with the speed of 5 DEG C/s, with 0.03s after insulation 7min after outer temperature is uniform-1Strain rate carry out hot compression；
The temperature of this process remains constant, and dependent variable reaches taking-up material water quenching when 0.8, obtains recrystallization abundant, fine uniform
Austenite structure, grain size >=9.5 grade；
Described solution treatment is that 316LN austenitic stainless steel is placed in 1150 DEG C of resistance furnace, water quenching after being incubated 2 hours, obtains
To even tissue, thick austenite crystal.
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| CN108031779A (en) * | 2017-11-29 | 2018-05-15 | 无锡透平叶片有限公司 | A kind of turbine blade and preparation method thereof |
| CN108193024A (en) * | 2017-12-18 | 2018-06-22 | 南昌大学 | A kind of method for improving 316LN austenitic stainless steel special grain boundary ratios |
| CN108754105A (en) * | 2018-06-25 | 2018-11-06 | 常熟理工学院 | A kind of control method that ER316L austenite stainless steel wire rod σ phases are precipitated |
| CN109735696B (en) * | 2019-01-25 | 2019-10-29 | 无锡市法兰锻造有限公司 | A kind of method of Austenitic stainless steel forging crystal grain refinement |
| CN111944958B (en) * | 2020-07-26 | 2022-09-20 | 杨军 | Preparation method of high-strength block 316L stainless steel |
| CN112375884B (en) * | 2020-11-19 | 2022-09-27 | 河南中原特钢装备制造有限公司 | Forging method for refining steel grains and reducing hydrogen content in steel |
| CN113088819B (en) * | 2021-04-01 | 2021-10-26 | 燕山大学 | Method for improving hot working performance of super austenitic stainless steel |
| CN113584263B (en) * | 2021-07-26 | 2022-06-21 | 安徽工业大学 | Method for eliminating mixed crystals in S31035 high-alloy austenitic heat-resistant steel |
| CN114410934B (en) * | 2022-01-25 | 2023-12-01 | 太原科技大学 | Method for refining coarse columnar crystal structure of electroslag remelting guard ring steel |
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| JPH04276042A (en) * | 1991-02-28 | 1992-10-01 | Hitachi Metals Ltd | Austenitic stainless steel and its production |
| JP2001192730A (en) * | 2000-01-11 | 2001-07-17 | Natl Research Inst For Metals Ministry Of Education Culture Sports Science & Technology | HIGH Cr FERRITIC HEAT RESISTANT STEEL AND ITS HEAT TREATMENT METHOD |
| CN101875069A (en) * | 2009-11-23 | 2010-11-03 | 北京科技大学 | Short-flow production method of high-boron stainless steel plate |
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