CN103421940B - A kind ofly a thermal cycling is utilized to carry out modified processing method to AISI4140 and AISI4340 structure iron forging - Google Patents
A kind ofly a thermal cycling is utilized to carry out modified processing method to AISI4140 and AISI4340 structure iron forging Download PDFInfo
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Abstract
The invention belongs to forging shaft manufacturing technology field, carry out modified in particular to utilizing a thermal cycling to large gauge forging, shorten the manufacturing cycle, reduce a kind of processing method of manufacturing cost, a kind ofly a thermal cycling is utilized to carry out modified processing method to large gauge structure iron forging, comprise following step: step one: forging adopts temperature Control Forging, step 2: utilize the heat after forging to carry out forging rear annealing+modifier treatment, the advantage of this invention is the enforcement by the technical program, utilize forging heat, hydrogen annealing and Tempering and Quenching is expanded after carrying out follow-up forging, realize the modifier treatment that a time thermal cycling completes forging, modified mechanical property is carried out suitable after the mechanical property of its modified rear product and roughing.
Description
Technical field
The invention belongs to forging shaft manufacturing technology field, particularly utilize a thermal cycling to carry out modified to large gauge forging, shorten the manufacturing cycle, reduce a kind of processing method of manufacturing cost.
Background technology
Tradition large gauge forging shaft carries out modified manufacturing process route and all adopts forging postheat treatment, carries out modified after roughing again.Not only the manufacturing cycle is long, needs the thermal cycling more than secondary simultaneously, and increase forging surface oxidation decarburizing tendency, manufacturing cost is high.Directly carry out expansion hydrogen annealing+modifier treatment after the present invention forges, adopt a thermal cycling to carry out modified, not only can reduce manufacturing cost, simultaneously energy shortened process, the effect that its mechanical property is modified after can reaching roughing equally.
Summary of the invention
The object of the present invention is to provide and a kind ofly utilize a thermal cycling to carry out modified processing method to large gauge structure iron forging, its forging mechanical property can reach the modified effect of roughing forging equally, can shorten the production cycle simultaneously and reduce manufacturing cost.
The object of the present invention is achieved like this:
Utilize a thermal cycling to carry out a modified processing method to large gauge structure iron forging, comprise following step:
Step one: forging adopts temperature Control Forging
Deflection and the temperature of last moulding process are forged in major control, and control mold temperature at 700 ~ 850 DEG C, deformation amount controlling, 20 ~ 30%, namely carries out temperature Control Forging at the AC3 Near The Critical Point higher than steel recrystallization temperature, to avoid critical strain amount; Simultaneously under the condition of equipment permission, controlling distortion amount is 20 ~ 30%, utilize the technological measures such as dynamic fully recrystallize, low temperature aximal deformation value and the rear rapid cooling of forging, deformation is effectively combined with phase transformation, realize multiple crystal grain thinning and improve tissue, its effect can reach the effect of the rear normalizing of comparative example forging, and low temperature moderate finite deformation amount, makes forging heart portion obtain Effective Compaction simultaneously.
Step 2: utilize the heat after forging to carry out forging rear annealing+modifier treatment
Hydrogen annealing will be expanded after forging and property heat treatment (namely modified) organically combines, realize a thermal cycling and reach traditional forging and adopt secondary thermal cycle to carry out the effect of modifier treatment.400 ~ 650 DEG C are chilled to soon after forging, then near material critical point, (600 ~ 700 DEG C) carry out treating material insulation, after forging process for fuel completes by the gross, cross and be chilled to 300 ~ 400 DEG C, be incubated by 1 ~ 2 hour/100mm, impel heart portion austenite to perlitic transformation, improve the rear grain fineness number of forging further and eliminate thick lamellar pearlite, doing tissue for follow-up quenching and prepare.Thereafter be warming up to modified quenching temperature, carry out modifier treatment; The quenching temperature of modifier treatment adopts 800 ~ 900 DEG C, all, soaking time adopts 0.5 ~ 1.5 hour/100mm, workpiece heart portion is made to reach specified temperature, complete austenitic transformation, the water-cooling pattern of sky-water space is adopted during quench cooled, carry out deep-hardening cooling, replace traditional water quenching and oil-cooling, abundant excavated material potentiality.Interval air cooling-water-cooled three times, air cooling time is≤3min for the first time, and the water-cooled time is 6-20min, second time air cooling time is 4-5min, the water-cooled time is 4-10min, and air cooling time is 5-6min for the third time, and the water-cooled time is 3-5min, the quenching defect caused under can avoiding quenching stress and thermal stress effect like this, can deeply undercooling, abundant excavated material potentiality, carry out high tempering after quenching, make that martensite decomposes, Transformation of Retained Austenite, thus reach and slightly add modified effect.
The advantage of this invention is the enforcement by the technical program, utilize forging heat, expand hydrogen annealing and Tempering and Quenching after carrying out follow-up forging, realize the modifier treatment that a time thermal cycling completes forging, it is suitable to carry out modified mechanical property after the mechanical property of its modified rear product and roughing.
Accompanying drawing explanation
Fig. 1 is the graphic representation expanding hydrogen+modifier treatment after forging.
Fig. 2 is the graphic representation of forging rear annealing.
Fig. 3 is the graphic representation carrying out modifier treatment after expanding hydrogen and roughing after forging.
Embodiment
Embodiment 1
Delivery specification is the AISI4140 forging of Φ 500 × 5800, at last fire of forging, the distortion allowance of reserved 30 ~ 100mm, forging temperature controls to carry out pulling operation at 700 ~ 800 DEG C, obtain desired shape and size, the rear air cooling of forging 450 ~ 550 DEG C to forging surface, right fed to boiler is incubated by 0.6 ~ 1.0h/100mm at 650 ± 50 DEG C, hang lower air cooling after insulation or mist cold, be chilled to 300 ~ 400 DEG C of fed to boiler to be incubated by 0.8 ~ 1.5h/100mm at this temperature, rise to 850 ± 50 DEG C after insulation, press at this temperature
0.6 ~ 1.0h/100mm carries out evenly, being incubated by 0.6 ~ 1.0h/100mm, quenching of coming out of the stove after insulation terminates, and adopts interval air cooling-water-cooling pattern to quench, then at 500 ± 50 DEG C, after being all incubated by 1.5 ~ 2.5h/100mm respectively, and air cooling.
Embodiment 2
Delivery specification is the AISI4340 forging of Φ 400 × 5800, at last fire of forging, the distortion allowance of reserved 60 ~ 120mm, forging temperature controls to carry out pulling operation at 750 ~ 850 DEG C, obtain desired shape and size, the rear air cooling of forging 500 ~ 550 DEG C to forging surface, right fed to boiler is incubated by 0.8 ~ 1.2h/100mm at 650 ± 50 DEG C, hang lower air cooling after insulation or mist cold, be chilled to 300 ~ 400 DEG C of fed to boiler to be incubated by 1.0 ~ 1.5h/100mm at this temperature, 850 ± 50 DEG C are risen to after insulation, 0.8 ~ 1.2h/100mm carries out samming, be incubated by 0.8 ~ 1.2h/100mm, to come out of the stove quenching after insulation terminates, interval air cooling-water-cooling pattern is adopted to quench, then at 550 ± 50 DEG C, after being all incubated by 2.0 ~ 2.5h/100mm respectively, air cooling.
Above-mentioned example is implemented rear mechanics properties testing and be the results are shown in Table 1
Table 1 mechanics properties testing result
From the result of table 1, the present invention forges after a rear employing thermal cycling is directly forged and expands hydrogen+modifier treatment, carry out annealing after final mechanical property and forging, carry out modified contrast after roughing and see, its intensity is suitable, toughness be better than traditional slightly add after carry out modified performance, reduce forging oxidation and decarburization phenomenon that repeatedly thermal cycling causes simultaneously, namely save manufacturing cost, simultaneously shortened process and manufacturing cycle.
Claims (1)
1. utilize a thermal cycling to carry out a modified processing method to AISI4140 and AISI4340 structure iron forging, it is characterized in that: comprise following step:
Step one: forging adopts temperature Control Forging
AISI4140 and AISI4340 structure iron forging process for fuel is controlled to type temperature at 700 ~ 850 DEG C when being shaped, deformation amount controlling is 20 ~ 30%, be conducive to further crystal grain thinning like this, simultaneously the low heart portion that is conducive to of final forging temperature obtains maximum deflection and carries out pulling operation and forging and molding;
Step 2: utilize the heat after forging to carry out forging rear annealing+modifier treatment
400 ~ 650 DEG C are chilled to soon after forging, then near material critical point, be 600 ~ 700 DEG C carry out treating material insulation, after forging process for fuel completes by the gross, cross and be chilled to 300 ~ 400 DEG C, be incubated by 1 ~ 2 hour/100mm, be conducive to like this impelling heart portion austenite to perlitic transformation, the rear grain fineness number of forging can be improved further and eliminate thick lamellar pearlite, do tissue for follow-up quenching to prepare, be then warming up to modified quenching temperature, carry out modifier treatment, the quenching temperature of modifier treatment adopts 800 ~ 900 DEG C, all, soaking time adopts 0.5 ~ 1.5 hour/100mm, workpiece heart portion is made to reach specified temperature, complete austenitic transformation, the water-cooled of sky-water space is adopted to carry out deep-hardening cooling during quench cooled, interval air cooling-water-cooled three times, air cooling time is≤3min for the first time, the water-cooled time is 6-20min, second time air cooling time is 4-5min, the water-cooled time is 4-10min, air cooling time is 5-6min for the third time, the water-cooled time is 3-5min, high tempering is carried out after quenching, martensite is decomposed, Transformation of Retained Austenite.
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Effective date of registration: 20180806 Address after: 459000 531 Industrial Park, Tiger Hill Industrial Cluster, Jiyuan City, Jiaozuo, Henan Patentee after: Henan Zhongyuan special steel equipment manufacturing Co., Ltd. Address before: 459000 Xiao Zhai, Cheng Liu town, Jiyuan, Henan Patentee before: Zhongyuan Special Steel Co., Ltd. |