CN101942632A - Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel - Google Patents
Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel Download PDFInfo
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- CN101942632A CN101942632A CN 201010290331 CN201010290331A CN101942632A CN 101942632 A CN101942632 A CN 101942632A CN 201010290331 CN201010290331 CN 201010290331 CN 201010290331 A CN201010290331 A CN 201010290331A CN 101942632 A CN101942632 A CN 101942632A
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- 238000005121 nitriding Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910001240 Maraging steel Inorganic materials 0.000 title abstract 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 16
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000006004 Quartz sand Substances 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 20
- 230000032683 aging Effects 0.000 claims description 18
- 238000005516 engineering process Methods 0.000 claims description 18
- 229910000734 martensite Inorganic materials 0.000 claims description 18
- 238000010494 dissociation reaction Methods 0.000 claims description 10
- 230000005593 dissociations Effects 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 2
- 239000007858 starting material Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 10
- 238000002156 mixing Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000004519 grease Substances 0.000 abstract 1
- 238000012423 maintenance Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 abstract 1
- 238000005488 sandblasting Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 11
- 238000012360 testing method Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000007669 thermal treatment Methods 0.000 description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000754 Wrought iron Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Abstract
The invention discloses a gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel, which comprises the procedures of: carrying out the solution treatment on raw materials and processing parts into the finished size; laying ammonium chloride and quartz sand through drying and uniformly blending at the bottom of a nitriding tank; eliminating grease dirt and drying 00Ni18Co8Mo5AlTi steel parts; carrying out the sand blasting processing on the parts before the nitriding processing; introducing ammonia and discharging air in the tank after enchasing and sealing the parts, carrying out the nitriding processing by a two-stage method during temperature rise along with a furnace when the resolution ratio of the ammonia in the tank is zero; switching off a power supply of a heating furnace and continuously supplying the gas to maintain the positive pressure in the nitriding tank when the nitriding processing and temperature maintenance are finished; removing the nitriding tank from the heating furnace and cooling in the air when the temperature is reduced to be below 300 DEG C along with the furnace; and stopping supplying the gas and taking out the nitriding parts when the temperature of the nitriding tank is reduced to be below 150 DEG C. The invention can ensure that the distortion of the size and the shape of the nitriding parts is less; the heart has good strength, plasticity and toughness; and the abrasive resistance and the fatigue resistance on the surface of the nitriding parts can be remarkably enhanced.
Description
Technical field
The present invention relates to a kind of nitriding heat treatment process of high strength martensitic aging steel, particularly the gas nitriding technology of 00Ni18Co8Mo5AlTi material.
Background technology
Nitriding thermal treatment is that active nitrogen-atoms is infiltrated piece surface, forms the extremely hard alloy nitride of one deck, to improve hardness, wear resistance and the erosion resistance on top layer.The processing method of nitriding mainly comprises gas nitriding, liquid nitriding and ionitriding etc., and wherein gas nitriding is occupied an leading position.Nitriding is handled and is carried out under 460～650 ℃ usually, and its biggest advantage is to ooze the back part to distort little.At present, the steel grade of nitriding processing mainly comprises structural alloy steel and various stainless steel.
00Ni18Co8Mo5AlTi is a kind of high strength martensitic aging steel, and it has good mechanical property, and after the solution treatment, its microstructure is Ultra-low carbon, nickelic single-phase martensite; After the ageing treatment, separate out in the intermetallic compound of martensitic range precipitation, refinement and disperse, material is strengthened, its intensity, plasticity and toughness good match are mainly used in essential industry fields such as aerospace, petrochemical complex and nuclear power.Blemish in an otherwise perfect thing be that the same with other high-strength steels, the fatigue strength of this material is on the low side.In recent years, the research that is intended to improve surperficial fatigue resistance concentrates on mainly that shot blasting on surface is handled and aspect such as surface modification thermal treatment.Wherein, nitriding is handled and is undoubtedly a kind of selection preferably, but because the surface of this material has one deck to hinder the passive film that activated nitrogen atom infiltrates, adopts the nitriding method of routine, can't form effective nitrided case, the gas nitriding technology that is used for the 00Ni18Co8Mo5AlTi material still belongs to blank.
Summary of the invention
In order to adopt surface modification thermal treatment to improve the surperficial fatigue resistance of high strength martensitic aging steel, the gas nitriding technology that the purpose of this invention is to provide a kind of 00Ni 18Co8Mo5AlTi high strength martensitic aging steel, adopt this gas nitriding technology, the distortion of nitriding accessory size and shape is little, heart portion has good intensity, plasticity and toughness, and significantly improves the wear resistance and the fatigue resistance on surface.
The objective of the invention is to be achieved through the following technical solutions:
A kind of gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel is characterized in that this technology follows these steps to carry out:
1) starting material are carried out solution treatment, then with part processing to final dimension;
2) at the bottom of the nitriding case, spread drying and ammonium chloride that mixes and quartz sand;
3) the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt and drying up;
4) part before the nitriding being carried out blast handles;
5) the logical ammonia in part vanning sealing back is caught up with air in the most case, when the ammonia dissociation rate in the case is " zero ", heats up with stove, carries out the two-phase method nitriding and handles;
6) nitriding insulation at the end disconnects the process furnace power supply, continues air feed and keeps malleation in the nitriding case, and when being cooled to below 300 ℃ with the stove cooling, the nitriding case is shifted out process furnace, cools off in air; When the temperature for the treatment of the nitriding case is reduced to below 150 ℃, stop air feed and take out the nitriding part.
Step 2 of the present invention) in, the ratio of ammonium chloride and quartz sand can be 1: 5, and ammonium chloride placement amount is calculated by the long-pending 100～150g/m3 of nitriding casing.In the step 3), the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt with gasoline and acetone and dry up.In the step 4), control air pressure is not more than 0.15MPa, the part before using 200～250 purpose emergies to nitriding carries out blast and handles, part behind the blast should be cased immediately and forbid and directly be touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
Need before the nitriding of the present invention carry out solution treatment to material in advance, then with part processing to final dimension, adopt common chamber type electric resistance furnace as heating installation, (480～510 ℃) carry out the two-phase method nitriding and handle in the aging temp interval.
Carrying out the two-phase method nitriding by following processing parameter handles:
(1) holding temperature: 500 ± 5 ℃, be incubated 3～4.5 hours, ammonia dissociation rate: 20～30%
(2) holding temperature: 505 ± 5 ℃, be incubated 45～75 hours, ammonia dissociation rate: 65～85%.
In the nitriding process, the unimpeded of intake and exhaust pipeline be should remain, temperature, gaseous tension and an ammonia dissociation rate measured every 30 minutes.
Nitriding insulation of the present invention at the end behind the disconnection process furnace power supply, continues logical ammonia or feeds nitrogen atmosphere in the case is replaced, and keeps malleation in the nitriding case, to prevent the part oxidation.
Because the 00Ni18Co8Mo5AlTi material easily forms fine and close passive film under normal conditions, hinders the infiltration of activated nitrogen atom.The present invention takes before nitriding part to be carried out the method that blast is handled, adds ammonium chloride in nitriding process, urges the effect of oozing to promote surface active and to reach.
Adopt the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel of the present invention, the distortion of nitriding accessory size and shape is little, and heart portion has good intensity, plasticity and toughness, and significantly improves the wear resistance and the fatigue resistance on surface.Nitrided case depth is 0.08～0.20mm, and layer surface hardness is not less than 700HV, and centre hardness is 49～52HRC, and its performance satisfies the demand of some Aeronautics and Astronautics with high strength driving shaft and gear.
Embodiment
A kind of gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel of the present invention is that the gear of 00Ni18Co8Mo5AlTi carries out nitriding and handles to material, and during production, by every batch of 20 gears, 3 totally batches are carried out nitriding respectively and handle:
1, get the rod iron that same buying batch, material are 00Ni18Co8Mo5AlTi (φ 35mm * 200mm), carry out solution treatment:
Heating installation: chamber type electric resistance furnace Heating temperature: 820 ± 10 ℃
Soaking time: 70～90 minutes types of cooling: air cooling
2, with all Gear Processing to final dimension, other learnt from else's experience material of solid solution, every lots processed is used for 2 of the thermal treatment test specimens of stove nitriding, test specimen is of a size of: φ 32mm * φ 15mm * 10mm (external diameter * internal diameter * highly).
3, be ready to heating installation and nitriding case, nitriding process furnace (chamber type electric resistance furnace) should be equipped with temperature and regulate registering instrument and warning device automatically, and instrument, instrument and thermopair should be at accreditation in the phases.Before the nitriding, reply nitriding process furnace, nitriding case and intake and exhaust pipeline are cleared up, and get rid of dirt and lime-ash.
4, get a cleaning, exsiccant nitriding case for every batch, the quartz sand that the chemical pure anhydrous ammonium chloride of 10g and 50g drying are handled carries out thorough mixing, and is layered on nitriding case bottom equably.
5, successively clean greasy dirt and dry up with every batch gear with stove nitriding test specimen with gasoline and acetone, control air pressure is not more than 0.15MPa, uses 200～250 purpose emergies that it is carried out the blast processing, part behind the blast and test specimen should be cased immediately and forbid and directly be touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
6, part vanning sealing back feeds ammonia, when the ammonia dissociation rate in the case is measured as " zero ", the nitriding case is packed into heat up with stove in the process furnace, and the gear of each batch carries out two-phase method nitriding processing by the processing parameter of table 1:
Each batch of table 1 Nitriding on Gear treatment process parameter
7, in the nitriding process, the ammonium chloride of use stops up gas exhaust duct, so answer the unimpeded of running check gas exhaust duct easily through heating, when decomposition is discharged by exhaust passage, being attached on the tube wall because pipe temperature reduces generation chemical reaction formation powder in the nitriding case.In addition, did the inspection of a project such as temperature, gaseous tension and ammonia dissociation rate every 30 minutes, and carry out associated note.
8, nitriding insulation at the end disconnects the process furnace power supply, continues logical ammonia keeping malleation in the nitriding case, and with stove cooling cooling.When under protection of ammonia, being cooled to below 300 ℃, the nitriding case is shifted out process furnace, in air, cool off (continue keep malleation in the case this moment, to prevent the part oxidation).When the temperature for the treatment of the nitriding case is reduced to below 150 ℃, stop for ammonia and take out nitriding gear and test specimen.
So far, the gas nitriding that the 00Ni18Co8Mo5AlTi gear is carried out disposes, and tests with the stove test specimen after to nitriding, produces a desired effect, and the assay of each batch gear is as shown in table 2:
Each batch of table 2 Nitriding on Gear result
The present invention only need adopt common chamber type electric resistance furnace as heating installation, and practicality is good, processing method is simple, is easy to promote, and goes for other high strength martensitic aging steels.During application, can select different processing parameters, satisfy corresponding heat treatment technics requirement according to concrete material.
Claims (7)
1. the gas nitriding technology of a 00Ni18Co8Mo5AlTi high strength martensitic aging steel is characterized in that this technology follows these steps to carry out:
1) starting material are carried out solution treatment, then with part processing to final dimension;
2) at the bottom of the nitriding case, spread drying and ammonium chloride that mixes and quartz sand;
3) the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt and drying up;
4) part before the nitriding being carried out blast handles;
5) the logical ammonia in part vanning sealing back is caught up with air in the most case, when the ammonia dissociation rate in the case is " zero ", heats up with stove, carries out the two-phase method nitriding and handles;
6) nitriding insulation at the end disconnects the process furnace power supply, continues air feed and keeps malleation in the nitriding case, and when being cooled to below 300 ℃ with the stove cooling, the nitriding case is shifted out process furnace, cools off in air; When the temperature for the treatment of the nitriding case is reduced to below 150 ℃, stop air feed and take out the nitriding part.
2. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that: step 2) in, the ratio of ammonium chloride and quartz sand is 1: 5, ammonium chloride placement amount is by the long-pending 100～150g/m of nitriding casing
3Calculate.
3. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that; In the step 3), the 00Ni18Co8Mo5AlTi steel components is cleaned greasy dirt with gasoline and acetone and dry up.
4. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1, it is characterized in that: in the step 4), control air pressure is not more than 0.15MPa, the part before using 200～250 purpose emergies to nitriding carries out blast and handles, part behind the blast should be cased immediately and forbid and directly be touched with hand, and the timed interval of blast and vanning must not be above 1 hour.
5. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that: in the step 5), carry out the two-phase method nitriding by following processing parameter and handle:
(1) holding temperature: 500 ± 5 ℃, be incubated 3～4.5 hours, ammonia dissociation rate: 20～30%
(2) holding temperature: 505 ± 5 ℃, be incubated 45～75 hours, ammonia dissociation rate: 65～85%.
6. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1, it is characterized in that: in the step 5), in the nitriding process, remain the unimpeded of intake and exhaust pipeline, measured temperature, gaseous tension and an ammonia dissociation rate every 30 minutes.
7. the gas nitriding technology of 00Ni18Co8Mo5AlTi high strength martensitic aging steel according to claim 1 is characterized in that: in the step 6), continue logical ammonia or feed nitrogen atmosphere in the case is replaced, to keep malleation in the nitriding case.
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| CN2010102903315A CN101942632B (en) | 2010-09-21 | 2010-09-21 | Gas nitriding process of 00Ni18Co8Mo5AlTi high-strength maraging steel |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517541A (en) * | 2011-12-19 | 2012-06-27 | 台州市百达热处理有限公司 | Gas nitriding treatment method of 11Cr17 stainless steel slip sheet |
| CN103774086A (en) * | 2014-01-16 | 2014-05-07 | 燕山大学 | Two-section rapid gas nitriding method for middle-carbon and low-carbon alloy structural steel |
| CN104250720A (en) * | 2014-09-15 | 2014-12-31 | 哈尔滨汽轮机厂有限责任公司 | Method for shortening gas nitriding process time of structural alloy steel |
| CN108747233A (en) * | 2018-05-04 | 2018-11-06 | 宁波市鄞州兴韩机械实业有限公司 | A kind of processing technology of mechanical main shaft |
| CN109182696A (en) * | 2018-11-21 | 2019-01-11 | 中国航发哈尔滨东安发动机有限公司 | A kind of three generations's carburizing Steel material nitrided surface method of modifying |
| CN109338280A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | Nitriding method after a kind of three generations's carburizing steel carburizing |
| CN109778108A (en) * | 2019-01-31 | 2019-05-21 | 中国航发动力股份有限公司 | A kind of Fe-Ni-Cr system high temperature alloy nitriding method |
| CN111500969A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Nitriding treatment system and nitriding treatment method for oil-stain-resistant stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108747233A (en) * | 2018-05-04 | 2018-11-06 | 宁波市鄞州兴韩机械实业有限公司 | A kind of processing technology of mechanical main shaft |
| CN108747233B (en) * | 2018-05-04 | 2019-11-08 | 宁波市鄞州兴韩机械实业有限公司 | A kind of processing technology of mechanical main shaft |
| CN109182696A (en) * | 2018-11-21 | 2019-01-11 | 中国航发哈尔滨东安发动机有限公司 | A kind of three generations's carburizing Steel material nitrided surface method of modifying |
| CN109338280A (en) * | 2018-11-21 | 2019-02-15 | 中国航发哈尔滨东安发动机有限公司 | Nitriding method after a kind of three generations's carburizing steel carburizing |
| CN109778108A (en) * | 2019-01-31 | 2019-05-21 | 中国航发动力股份有限公司 | A kind of Fe-Ni-Cr system high temperature alloy nitriding method |
| CN111500969A (en) * | 2020-04-30 | 2020-08-07 | 海门金锋盛厨房设备有限公司 | Nitriding treatment system and nitriding treatment method for oil-stain-resistant stainless steel |
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