CN105032970B - Nickel base alloy extruded bar induction heating method - Google Patents
Nickel base alloy extruded bar induction heating method Download PDFInfo
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- CN105032970B CN105032970B CN201510554221.8A CN201510554221A CN105032970B CN 105032970 B CN105032970 B CN 105032970B CN 201510554221 A CN201510554221 A CN 201510554221A CN 105032970 B CN105032970 B CN 105032970B
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Abstract
The invention relates to a nickel base alloy extruded bar induction heating method. The nickel base alloy extruded bar induction heating method comprises the following steps: the heating time is not shorter than 150 min; and the furnace discharge temperature is within 900-950 DEG C; a blank is fed to an induction heating furnace; the diameter of the blank is not larger than 260 mm; and the length is not larger than 90% of the length of a heating coil of the induction furnace; and the induction heating is controlled by two phases: the first phase: the heating power (KW)=the blank diameter (mm)*K1 (KW/mm); K1=1.1-1.2; the heating time (s)=1/2 blank diameter (mm)*M (s/mm); M=1.4-1.6; and the second phase: the blank is directly heated to the target temperature through induction heating; the heating power (KW)=the blank diameter (mm)*K2 (KW/mm); K2=2.0-2.2; the target temperature is kept; the insulation power is 15-30 KW; and the time is 30-45 s. The method overcomes the phenomenon of nonuniform blank induction heating temperature; and no cracking phenomenon is generated.
Description
Technical field
The invention belongs to nickel-base alloy thermal deformation technical field, and in particular to a kind of nickel-base alloy extruded barses sensing heating
Method.
Background technology
Nickel-base alloy has excellent corrosion-resistant, antioxidation and good mechanical performance, in Aeronautics and Astronautics, the energy and stone
Oily chemical field is widely used, and uses form according to its product, is broadly divided into plate, pipe, rod, line.Nickel-base alloy bar is main
As product raw materials such as rotary shaft class, securing member class, bearing members, relatively stricter, bar master is required to its interior tissue
Using forging and to extrude two ways production.And for hot extrusion bar, as which has excellent surface quality, tiny
The remarkable advantages such as even interior tissue, high yield, by as processing greater degree product raw materials.With high alloy content
Rustless steel is compared, and nickel-base alloy has higher resistance of deformation and relatively low thermal conductivity, using high alloy content rustless steel phase
Same production technology, in actual extrusion process of production, before often there is extruding, the fluctuation of blank induction heating temperature is larger simultaneously
And serious uneven phenomenon（The highest temperature difference is up to 400 DEG C）, even there is " evil mind " phenomenon in blank of coming out of the stove when serious, so as to cause
Extruded barses severe bends (linearity is 0.1 meter per meter), surface fish scale defect, fractography difference are big, extruding is ftractureed, extruding
The phenomenons such as vexed car, cause larger economic loss.
The content of the invention
The present invention is to overcome the shortcomings of existing nickel-base alloy extruded barses induction heating method, there is provided a kind of Ni-based conjunction
Golden extruded barses induction heating method, overcomes that the fluctuation of blank induction heating temperature is larger and serious uneven phenomenon, finally
Obtain high-quality extruded barses.
In nickel base superalloy of the present invention, Ni >=45% in alloy（Mass fraction）.
This nickel-base alloy extruded barses induction heating method include it is following successively the step of：
I blank is heated initially with roller bottom stove, and total time inside furnace is not less than 150min, and tapping temperature is controlled 900
Between～950 DEG C；
II goes out roller bottom stove blank delivers to induction heater using roller-way, it is desirable to which blank diameter≤260mm, length are not more than
The 90% of induction furnace heating coil length；
III solves blank temperature using two-stage control sensing heating+control heat preservation technology scheme controls inaccurate and temperature not
Equal phenomenon；
First stage induction heating power is determined according to blank cross section diameter size,
Heating power（KW）=blank diameter（mm）×K1（KW/mm）,
The numerical value K1=1.1-1.2 of regulationing factor of power K1, i.e. diameter are per 1mm power demands；
Heat time heating time (s)=1/2 blank diameter（mm）× M (s/ mm),
The numerical value M=1.4-1.6 of time adjustment coefficient M, i.e. diameter are per the time needed for 1mm；
Second stage sensing heating makes blank directly rise to target temperature,
Heating power（KW）=blank diameter（mm）× K2 (KW/ mm),
The numerical value K2=2.0-2.2 of regulationing factor of power K2, i.e. diameter are per 1mm power demands；
Reach progress soaking zone after target temperature, soaking zone 15～30KW of setting power, 30～45s of temperature retention time.
First stage sensing heating takes low-power, long-time principle, it is to avoid due to the base that serious " collection skin " effect is caused
Material surface overtemperature and the excessive phenomenon of end face temperature difference.Jing is measured, and after first stage sensing heating is finished, Preform surface temperature is about
Between 1080～1120 DEG C, end face center portion is less than 40 DEG C with edge temperature difference.
Second stage sensing heating makes blank directly rise to target temperature, heating power（KW）=blank diameter（mm）×K2
（KW/mm）（K2=2.0-2.2）, after reaching target temperature, enter soaking zone, soaking zone 15～30KW of setting power, temperature retention time
30～45s, the purpose of soaking zone are in order that blank temperature is more uniform and the radiation loss of compensation blank.Jing is measured, Jing
Come out of the stove after insulation Preform surface temperature and target temperature difference≤20 DEG C, end face center portion and edge temperature difference≤25 DEG C.
Beneficial effects of the present invention
The nickel-base alloy extruded barses induction heating method of the present invention is adopted, the nickel-base alloy extruded barses for obtaining eliminate table
Facial cleft stricture of vagina, extruding bending, its linearity are not more than 0.02 meter per meter, and without cracking phenomena, bar fine microstructures are uniform, stove blank table
Face temperature and target temperature difference≤20 DEG C, end face center portion and edge temperature difference≤25 DEG C, grain size number is poor≤and 2, tissue is
Even, production is stable.
Specific embodiment
Describe the specific embodiment of the present invention in conjunction with the embodiments in detail, but the specific embodiment of the present invention is not limited to
In following embodiments, following embodiments are not limitations of the present invention.
Embodiment 1
The present embodiment is to obtain Inconel625 forging stock material using VIM+ESR footpaths forging process, and the forging blank surface machine of carrying out adds
Process, 222 × 680mm of final blank specification φ.
The percentage by weight of chemical composition is：
C 0.02%, Cr 22%, Ni 64.35%, Mo 9%, Al 0.4%, Nb 4.0%, Ti 0.2%,
Remaining is inevitable impurity.
The present embodiment include it is following successively the step of：
I blank room temperature enters roller bottom stove（Roller bottom stove is circular continuous warming device, is room temperature when entering stove, and then blank is in stove
Interior rolling, is a process for gradually heating up）, time inside furnace 157min goes out 920 DEG C of roller bottom furnace temperature.
II goes out roller bottom stove blank delivers to induction heater using roller-way, it is desirable to blank diameter φ 222mm, length 680mm,
Induction furnace loop length 1000mm；
III adopts two-stage control sensing heating+control heat preservation technology, solves blank temperature control and is forbidden and temperature inequality
Phenomenon.
First stage induction heating power 260KW（The present embodiment takes K1=1.17）, heat time heating time 170s（The present embodiment takes M
=1.53）；
First stage sensing heating takes low-power, long-time principle, it is to avoid due to the base that serious " collection skin " effect is caused
Material surface overtemperature and the excessive phenomenon of end face temperature difference.Jing is measured, and after first stage sensing heating is finished, Preform surface temperature is
Between 1080～1120 DEG C, end face center portion is less than 40 DEG C with edge temperature difference.
Second stage induction heating power 445KW, 1190 DEG C of target temperature, soaking zone power 15KW, temperature retention time 30s.
The purpose of soaking zone is in order that blank temperature is more uniform and the radiation loss of compensation blank.Blank is come out of the stove surface temperature
1196 DEG C, 1187 DEG C of end face center portion temperature, 1194 DEG C of end face edge temperature.Extruded barses specification φ 80mm, it is free of surface defects, curved
The phenomenons such as bent, cracking, even tissue.
In actual production process, first stage and second stage sensing heating are realized in an induction installation,
It is to be provided with two process curves, successively performs.Therefore, after sensing heating is finished in the first stage, it is not thermometric.This enforcement
It is the quick measurement of coming out of the stove temporarily in order to verify the application technique in example.
Embodiment 2
The present embodiment is to obtain C-276 forging stock material using VIM+ESR+footpath forging process, and the forging blank surface machine of carrying out adds place
Reason, 258 × 770mm of final blank specification φ.
The percentage by weight of chemical composition is：
C 0.01%, Cr 16%, Ni 58.96%, Mo 16%, Fe 5%, W 4%,
Remaining is inevitable impurity.
The present embodiment include it is following successively the step of：
I blank room temperature enters roller bottom stove, and time inside furnace 165min goes out 940 DEG C of roller bottom furnace temperature.
II goes out roller bottom stove blank delivers to induction heater using roller-way, it is desirable to blank diameter φ 258mm, length 770mm,
Induction furnace loop length 1000mm；
III adopts two-stage control sensing heating+control heat preservation technology, solves blank temperature control and is forbidden and temperature inequality
Phenomenon.
First stage induction heating power 285KW（The present embodiment takes K1=1.1）, heat time heating time 195s（The present embodiment takes M
=1.51）；
First stage sensing heating takes low-power, long-time principle, it is to avoid due to the base that serious " collection skin " effect is caused
Material surface overtemperature and the excessive phenomenon of end face temperature difference.Jing is measured, and after first stage sensing heating is finished, Preform surface temperature is
Between 1080～1120 DEG C, end face center portion is less than 40 DEG C with edge temperature difference.
Second stage induction heating power 520KW（The present embodiment takes K2=2.0）, 1200 DEG C of target temperature, soaking zone work(
Rate 20KW, temperature retention time 32s.The purpose of soaking zone is in order that blank temperature is more uniform and radiation of compensation blank is damaged
Lose.Blank is come out of the stove 1206 DEG C of surface temperature, 1191 DEG C of end face center portion temperature, 1204 DEG C of end face edge temperature.Extruded barses specification
The phenomenons such as φ 80mm, free of surface defects, bending, cracking, even tissue.
Embodiment 3
The present embodiment is to obtain Inconel718 forging stock material using VIM+ESR+footpath forging process, and forging blank surface carries out machine
Plus process, 218 × 790mm of final blank specification φ.
The percentage by weight of chemical composition is：
C 0.06%, Cr 19%, Ni 50.97%, Mo 3.0%, Al 0.4%, Ti 1.0%, Nb 5.0%,
Fe 20.54%, remaining is inevitable impurity.
The present embodiment include it is following successively the step of：
I blank room temperature enters roller bottom stove, and time inside furnace 180min goes out 900 DEG C of roller bottom furnace temperature.
II goes out roller bottom stove blank delivers to induction heater using roller-way, it is desirable to blank diameter φ 218mm, length 790mm,
Induction furnace loop length 1000mm；
III adopts two-stage control sensing heating+control heat preservation technology, solves blank temperature control and is forbidden and temperature inequality
Phenomenon.
First stage induction heating power 240KW（The present embodiment takes K1=1.1）, heat time heating time 165s（The present embodiment takes M
=1.51）；
First stage sensing heating takes low-power, long-time principle, it is to avoid due to the base that serious " collection skin " effect is caused
Material surface overtemperature and the excessive phenomenon of end face temperature difference.Jing is measured, and after first stage sensing heating is finished, Preform surface temperature is
Between 1080～1120 DEG C, end face center portion is less than 40 DEG C with edge temperature difference.
Second stage induction heating power 440KW（The present embodiment takes K2=2）, 1150 DEG C of target temperature, soaking zone power
15KW, temperature retention time 30s.The purpose of soaking zone is in order that blank temperature is more uniform and the radiation loss of compensation blank.
Blank is come out of the stove 1157 DEG C of surface temperature, 1146 DEG C of end face center portion temperature, 1152 DEG C of end face edge temperature.Extruded barses specification φ
The phenomenons such as 85mm, free of surface defects, bending, cracking, even tissue.
Claims (3)
1. a kind of nickel-base alloy extruded barses induction heating method, it include it is following successively the step of：
I blank is heated initially with roller bottom stove, and total time inside furnace is not less than 150min, tapping temperature control 900～
Between 950 DEG C；
II goes out roller bottom stove blank delivers to induction heater using roller-way, it is desirable to blank diameter≤260mm, and length no more than senses
The 90% of stove heat loop length；
III using two-stage control sensing heating+the solution blank temperature control of control heat preservation technology scheme is forbidden and temperature is uneven existing
As；
First stage induction heating power is determined according to blank cross section diameter size,
Heating power=blank diameter × K1,
The numerical value K1=1.1-1.2 of regulationing factor of power K1；
Heat time heating time=1/2 blank diameter × M,
The numerical value M=1.4-1.6 of time adjustment coefficient M；
Second stage sensing heating makes blank directly rise to target temperature,
Heating power=blank diameter × K2,
The numerical value K2=2.0-2.2 of regulationing factor of power K2；
Wherein the unit of heating power is KW；
The unit of blank diameter is mm；
The unit of regulationing factor of power K1 and K2 is KW/mm：
The unit of heat time heating time is s；
The unit of time adjustment coefficient M is s/mm；
Reach progress soaking zone after target temperature, soaking zone 15～30KW of setting power, 30～45s of temperature retention time.
2. a kind of nickel-base alloy extruded barses induction heating method according to claim 1, is characterized in that：Step III, the
One stage sensing heating is complete to come out of the stove, and Preform surface temperature is that end face center portion is less than with edge temperature difference between 1080～1120 DEG C
40℃。
3., according to a kind of arbitrary described nickel-base alloy extruded barses induction heating method of claim 1 or 2, it is characterized in that：Step
Rapid III, come out of the stove after the insulation of second stage sensing heating, Preform surface temperature and target temperature difference≤20 DEG C, end face center portion and side
Portion temperature difference≤25 DEG C.
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|---|---|---|---|
| CN201510554221.8A CN105032970B (en) | 2015-09-02 | 2015-09-02 | Nickel base alloy extruded bar induction heating method |
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| CN105032970B true CN105032970B (en) | 2017-03-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082936A (en) * | 1975-06-24 | 1978-04-04 | Fuji Electric Co., Ltd. | Device and method for heating die |
| CN101817030B (en) * | 2009-11-23 | 2012-01-25 | 中色科技股份有限公司 | Technical configuration method for major-diameter aluminum-alloy round cast ingot heating facility |
| CN103769427A (en) * | 2014-01-06 | 2014-05-07 | 山西太钢不锈钢股份有限公司 | Extrusion method of niobium tube |
| CN104174683A (en) * | 2014-07-17 | 2014-12-03 | 太原钢铁(集团)有限公司 | Induction heating temperature control method for nickel-base superalloy hot extrusion tubulation |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03266390A (en) * | 1990-03-16 | 1991-11-27 | Sumitomo Metal Ind Ltd | Heating method of billet by inductive heating furnace |
-
2015
- 2015-09-02 CN CN201510554221.8A patent/CN105032970B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082936A (en) * | 1975-06-24 | 1978-04-04 | Fuji Electric Co., Ltd. | Device and method for heating die |
| CN101817030B (en) * | 2009-11-23 | 2012-01-25 | 中色科技股份有限公司 | Technical configuration method for major-diameter aluminum-alloy round cast ingot heating facility |
| CN103769427A (en) * | 2014-01-06 | 2014-05-07 | 山西太钢不锈钢股份有限公司 | Extrusion method of niobium tube |
| CN104174683A (en) * | 2014-07-17 | 2014-12-03 | 太原钢铁(集团)有限公司 | Induction heating temperature control method for nickel-base superalloy hot extrusion tubulation |
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