CN103074574A - Low temperature salt-bath nitridation technology of Ni-based alloy workpiece - Google Patents
Low temperature salt-bath nitridation technology of Ni-based alloy workpiece Download PDFInfo
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- CN103074574A CN103074574A CN2012105398849A CN201210539884A CN103074574A CN 103074574 A CN103074574 A CN 103074574A CN 2012105398849 A CN2012105398849 A CN 2012105398849A CN 201210539884 A CN201210539884 A CN 201210539884A CN 103074574 A CN103074574 A CN 103074574A
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Abstract
The invention relates to a low temperature salt-bath nitridation technology of an Ni-based alloy workpiece. The technology is characterized in that a nitridation salt for salt-bath nitridation is composed of 1-45wt% of KCNO, 1-35wt% of NaCNO, 5-20wt% of K2CO3, 5-15wt% of Na2CO3, 3-10wt% of Li2CO3, 5-25wt% of NaCl, and 5-20wt% of KCl. The low temperature salt-bath nitridation technology of the Ni-based alloy workpiece is characterized in that the technology comprises the steps of (1) cleaning, (2) drying preheating, (3) nitridation, (4) cooling, (5) cleaning and drying, and (6) polishing. The technology enables the hardness, the wear resistance, the fatigue resistance and the corrosion resistance of the Ni-based alloy surface to be obviously improved.
Description
Technical field
The present invention relates to a kind of Ni base alloy workpiece low temperature salt-bath nitriding process.
Background technology
The Salt-bath Nitriding Technology treatment technology is also referred to as the tufftride treatment technology, the activated nitrogen atom that utilizes the decomposition of cyanate radical and produce infiltrates workpiece, form the nitride layer of one deck densification at workpiece surface, thereby improve wear resistance, erosion resistance and the fatigue resistance of Ni base alloy workpiece, so salt-bath nitriding is widely used in the production practice.But less to Ni base alloy workpiece cryogenic nitrogen metallization processes both at home and abroad.
Summary of the invention
The purpose of invention is for a kind of Ni base alloy workpiece nitriding process is provided, can so that after the nitrogenize of a kind of Ni base alloy its wear resistance greatly improve and so that the low temperature nitridation treatment method that solidity to corrosion also improves.
The present invention relates to a kind of Ni base alloy workpiece low temperature salt-bath nitriding process, it is characterized in that being undertaken by following technical process:
Clean: Ni base alloy workpiece is placed in acetone or the alcohol medium, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, to remove the workpiece surface greasy dirt;
Drying and forewarm: the Ni base alloy workpiece that cleans up is dried in dryer, and about 300 ℃, carry out preheating 25 minutes;
Nitrogenize: the nitridation salt of special-purpose Ni base alloy low temperature salt-bath nitrogenize is put into nitriding furnace, and be heated to it at 430 ℃-450 ℃ and melt fused solution, then preheated Ni base alloy workpiece is put into and carried out nitrogenize 120 ~ 1200 minutes, the temperature in the nitriding furnace remains on 430 ~ 450 ℃; The technique of described Ni base alloy low temperature salt-bath nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 1% ~ 45%, and NaCNO 1% ~ 35%, K
2CO
35% ~ 20%, Na
2CO
35% ~ 15%, Li
2CO
33% ~ 10%, La
2(CO
3)
30.1 ~ 5%, Ce
2(CO
3)
30.1 ~ 5%, NaCl 5% ~ 25%, KCl 5% ~ 20%, Na
2SO
40.1% ~ 3%, Na
2S 0.01-0.5%, K
2S 0.01-0.5%;
Cooling: after sample is come out of the stove, at room temperature be cooled to room temperature;
Clean and oven dry: after the cooling, with the salt of clear water flush away workpiece surface, and in dryer, dry with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good;
Polishing: workpiece is polished at the vibrations polishing machine, remove the surface porosity layer.
The present invention adopts a kind of low temperature salt-bath nitriding process of Ni base alloy nitrogenize workpiece, uses specific nitridation salt, can effectively improve hardness, wear resistance, fatigue resistance and the solidity to corrosion on Ni base alloy workpiece surface.
Description of drawings
Fig. 1 be after the Inconel 718 alloy workpiece low temperature nitrogenize the cross section metallograph.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, process program of the present invention is specifically described.
Embodiment 1
Inconel 718 alloy workpieces are placed in the acetone, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, remove the workpiece surface greasy dirt, then with clear water workpiece is cleaned; Workpiece is dried in dryer, be put in interior about 300 ℃ of stove after the oven dry and carried out preheating 25 minutes; Then add the nitridation salt that nitrogenize is used in nitriding furnace, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 30%, NaCNO30%, K
2CO
312%, Na
2CO
310%, Li
2CO
32%, La
2(CO
3)
30. 5%, Ce
2(CO
3)
30. 5%, NaCl 6%, KCl 7%, Na
2SO
41.5%, Na
2S 0.2%, K
2S 0.3%.Nitridation salt is heated to its melting in nitriding furnace liquid, then preheated workpiece put into crucible, and the temperature in the nitriding furnace remains on 450 ℃ of nitrogenize 1200 minutes, during also frequently pass into oxygen; After 1200 minutes, workpiece is taken out, and place air to be cooled to room temperature; Workpiece that then will cooling is in a large amount of cleanings; In dryer, dry polishing with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good.Obtain Inconel 718 microstructure of the alloys under the opticmicroscope.
Claims (4)
1. Ni base alloy workpiece low temperature salt-bath nitriding process is characterized in that being undertaken by following technical process:
Clean: Ni base alloy workpiece is placed in acetone or the alcohol medium, cleaned 15 minutes under 50 ℃ of left and right sides conditions with Ultrasonic Cleaners, to remove the workpiece surface greasy dirt;
Drying and forewarm: the Ni base alloy workpiece that cleans up is dried in dryer, and about 300 ℃, carry out preheating 25 minutes;
Nitrogenize: the nitridation salt of special-purpose Ni base alloy low temperature salt-bath nitrogenize is put into nitriding furnace, and be heated to it at 430 ℃-450 ℃ and melt fused solution, then preheated Ni base alloy workpiece is put into and carried out nitrogenize 120 ~ 1200 minutes, the temperature in the nitriding furnace remains on 430 ~ 450 ℃;
Cooling: after sample is come out of the stove, at room temperature be cooled to room temperature;
Clean and oven dry: after the cooling, with the salt of clear water flush away workpiece surface, and in dryer, dry with 80 ℃ of left and right sides temperature workpiece that nitrogenize is good;
Polishing: workpiece is polished at the vibrations polishing machine, remove the surface porosity layer.
2. by the technique of Ni base alloy low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 1% ~ 45%, and NaCNO 1% ~ 35%, K
2CO
35% ~ 20%, Na
2CO
35% ~ 15%, Li
2CO
33% ~ 10%, La
2(CO
3)
30.1 ~ 5%, Ce
2(CO
3)
30.1 ~ 5%, NaCl 5% ~ 25%, KCl 5% ~ 20%, Na
2SO
40.1% ~ 3%, Na
2S 0.01-0.5%, K
2S 0.01-0.5%.
3. by the technique of Ni base alloy low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the nitridation salt of salt-bath nitriding is grouped into by following one-tenth by weight percentage: KCNO 30%, NaCNO30%, K
2CO
312%, Na
2CO
310%, Li
2CO
32%, La
2(CO
3)
30. 5%, Ce
2(CO
3)
30. 5%, NaCl 6%, KCl 7%, Na
2SO
41.5%, Na
2S 0.2%, K
2S 0.3%.
4. by the technique of Ni base alloy low temperature salt-bath claimed in claim 1 nitrogenize, it is characterized in that the temperature in the salt-bath nitriding Nitrogen During stove remains on 430 ~ 450 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105398849A CN103074574A (en) | 2012-12-14 | 2012-12-14 | Low temperature salt-bath nitridation technology of Ni-based alloy workpiece |
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|---|---|---|---|
| CN2012105398849A CN103074574A (en) | 2012-12-14 | 2012-12-14 | Low temperature salt-bath nitridation technology of Ni-based alloy workpiece |
Publications (1)
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|---|---|
| CN103074574A true CN103074574A (en) | 2013-05-01 |
Family
ID=48151266
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0551702A1 (en) * | 1992-01-14 | 1993-07-21 | Daido Hoxan Inc. | Method of nitriding nickel alloy |
| CN1508282A (en) * | 2002-09-04 | 2004-06-30 | ͬ�Ϳ�ҵ��ʽ���� | Method for producing metal member with intensified corrosion-resisting property by salt-bath nitrizing |
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
| CN102392212A (en) * | 2011-11-15 | 2012-03-28 | 西华大学 | Low-temperature nitriding nitride salt |
-
2012
- 2012-12-14 CN CN2012105398849A patent/CN103074574A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0551702A1 (en) * | 1992-01-14 | 1993-07-21 | Daido Hoxan Inc. | Method of nitriding nickel alloy |
| CN1508282A (en) * | 2002-09-04 | 2004-06-30 | ͬ�Ϳ�ҵ��ʽ���� | Method for producing metal member with intensified corrosion-resisting property by salt-bath nitrizing |
| CN102220553A (en) * | 2011-07-04 | 2011-10-19 | 四川大学 | Nitride salt for low temperature salt bath nitriding of stainless steel |
| CN102392212A (en) * | 2011-11-15 | 2012-03-28 | 西华大学 | Low-temperature nitriding nitride salt |
Non-Patent Citations (1)
| Title |
|---|
| 罗德福 等: "QPQ处理对Inconel718镍基合金结构的影响", 《西华大学学报（自然科学版）》 * |
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Application publication date: 20130501 |