CN108103284B - Method for improving structure of nitride layer of 1Cr13 steel film-making cover-closing part - Google Patents
Method for improving structure of nitride layer of 1Cr13 steel film-making cover-closing part Download PDFInfo
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- CN108103284B CN108103284B CN201711209853.6A CN201711209853A CN108103284B CN 108103284 B CN108103284 B CN 108103284B CN 201711209853 A CN201711209853 A CN 201711209853A CN 108103284 B CN108103284 B CN 108103284B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/08—Extraction of nitrogen
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/773—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention aims to provide a method for improving the nitride layer structure of a 1Cr13 steel film-making covered part, which is characterized by comprising the following steps of checking ①, checking the process of an incoming piece, vacuum nitrogen removing ②, and vacuumizing the vacuum chamber to 6.7 x 10 before heating‑2Pa, heating and heat-insulating for a certain time, wherein the pressure in the vacuum chamber is not more than 6.7 multiplied by 10 in the heating and heat-insulating process‑2Pa, filling argon after heat preservation, cooling to below 80 ℃, discharging, ③ checking, checking the texture and hardness of the infiltrated layer, decomposing the original net-shaped or vein-shaped nitride in the nitride layer under the premise of not reducing the mechanical property of the material, diffusing nitrogen elements to the direction of the matrix, achieving the purpose of reducing the net-shaped or vein-shaped nitride in the infiltrated layer of the part, and the hardness of the part after nitrogen removal meets the requirement that HR15N is more than or equal to 88, which can be used as a remedy measure after the defect occurs.
Description
Technical Field
The invention belongs to the technical field of heat treatment, and particularly provides a process method for reducing 1Cr13 steel film cover part nitride layer net-shaped or vein-shaped nitride.
Background
The 1Cr13 martensite-ferrite stainless steel can obtain better strength and toughness matching after quenching and tempering and nitriding treatment, can also obviously improve the working surface hardness, the wear resistance, the fatigue strength and the thermal stability, and is generally used as a nitriding part. However, due to factors such as process, equipment or operation, reticular or vein-like nitrides appear in the infiltrated layer, so that the nitrided part is high in brittleness, and the infiltrated layer structure does not meet the rating standard or the inspection requirement.
At present, the prior art only can improve the nitride of a structural steel nitride layer in a net or pulse shape, and can not effectively improve the nitride shape and distribution. For 1Cr13 stainless steel, the chromium element content is high, and the movement or diffusion capability of nitrogen element is weak in the nitrogen-removing process, so the improvement of the nitride layer structure of 1Cr13 stainless steel parts becomes a technical problem.
Disclosure of Invention
On the premise of not reducing the mechanical property of the material, the invention adopts a proper vacuum denitrogenation heat treatment process to decompose the original net-shaped or vein-shaped nitride in the nitride layer and diffuse nitrogen elements to the direction of a matrix, thereby achieving the purpose of reducing the net-shaped or vein-shaped nitride in the permeation layer of the part, and the hardness of the part after denitrogenation meets the requirement that HR15N is more than or equal to 88, and the invention can be used as a remedy after the defect occurs.
The invention can obviously reduce the net-shaped or vein-shaped nitride in the nitriding layer of the 1Cr13 stainless steel film-making cover-closing part and reduce the brittleness of the part, and the specific technical scheme is as follows:
a method for improving the structure of a nitride layer of a 1Cr13 steel film-making cover part is characterized by comprising the following steps:
① inspecting, namely, inspecting the process of the incoming piece;
② vacuum denitrogenation by heating and pumping the pressure in the vacuum chamber to 6.7X 10-2Pa, heating and heat-insulating for a certain time, wherein the pressure in the vacuum chamber is not more than 6.7 multiplied by 10 in the heating and heat-insulating process-2Pa, filling argon after heat preservation, cooling to below 80 ℃, and discharging;
③ inspection, checking the infiltrated tissue and hardness.
The invention relates to a method for improving the structure of a nitride layer of a 1Cr13 steel film-making cover-closing part, which is characterized by comprising the following steps: the 1Cr13 steel film-making cover-closing part is made of 1Cr13 martensite-ferrite stainless steel, and comprises the following chemical components in percentage by weight: 0.08-0.15% of C, 12.00-14.00% of Cr, less than or equal to 0.60% of Mn, less than or equal to 0.60% of Si, less than or equal to 0.60% of Ni, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance of Fe.
In step ②, the denitrogenation treatment is kept at 580-620 ℃ for 5-8 h and at 590 ℃ for 6h, and the research result shows that, unlike the nitriding structure of the structural steel part, the nitride can be effectively decomposed only by heating the 1Cr13 steel part to a certain high temperature and keeping the temperature for a sufficient time, so the heating temperature and the keeping time become the key points of the denitrogenation treatment.
In the step ②, argon is filled at 0.2-0.4 MPa (most preferably 0.3MPa) after the heat preservation is finished.
The method adopts proper vacuum nitrogen-removing technological parameters, can effectively reduce the net-shaped or vein-shaped nitride in the nitride layer of the 1Cr13 stainless steel film-making cover-closing part, is effective for parts with larger machining allowance, and is also suitable for parts with small machining allowance or parts with inconvenient mechanical machining on the surface. According to the heat treatment system, the nitride is easily decomposed, the surface nitrogen concentration is reduced, nitrogen is diffused inwards, the hardness gradient of a diffusion layer of the part is gradually reduced, the brittleness of the part is improved, and surface oxidation decarburization is prevented. The nitrogen removing temperature is lower than the tempering temperature of the part, and the performance of the matrix is not influenced. The method has simple process and easy operation, and can be used as a remedial measure after the defects appear.
Drawings
FIG. 1 shows the appearance of a nitrided infiltrated layer (picric acid corrosion) of a 1Cr13 stainless steel film-made cover-closed part;
FIG. 2 shows the morphology of a nitrided layer after nitrogen stripping at 590 ℃/6h (picric acid corrosion);
FIG. 3 shows the depth contrast of the nitrided layer before and after nitrogen stripping at 590 ℃/6h, with the left being before nitrogen stripping and the right being after nitrogen stripping.
Detailed Description
The 1Cr13 steel film cover closing part in the embodiment of the invention is made of 1Cr13 martensite-ferrite stainless steel, and comprises the following chemical components in percentage by weight: 0.08-0.15% of C, 12.00-14.00% of Cr, less than or equal to 0.60% of Mn, less than or equal to 0.60% of Si, less than or equal to 0.60% of Ni, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance of Fe. And (4) carrying out structural performance analysis and test by using equipment such as a metallographic microscope, a microhardness meter and the like. In order to avoid oxidation and decarburization of the permeated layer, a vacuum furnace is selected as test equipment.
Examples
A method for improving the structure of a nitride layer of a 1Cr13 stainless steel film-making covered part comprises the following steps:
① inspection, the procedure of the incoming sample is inspected, the surface of the sample should be clean, and no excess is left.
② vacuum denitrogenation: before heating, the pressure in the vacuum chamber is pumped to 6.7 multiplied by 10-2Pa, heating and maintaining for a certain time (see table 1), wherein the pressure in the vacuum chamber is not more than 6.7 × 10 during the heating and maintaining process-2Pa, filling argon gas at 0.3MPa after heat preservation, cooling to below 80 ℃, and discharging.
③, checking, namely checking the nitrided layer structure and hardness, wherein the hardness HR15N of the nitrided surface is more than or equal to 88, and the nitrided layer structure is superior to semi-continuous fine-mesh nitride.
And (3) observing tissues: and observing the permeable layer structure of the sample by using a metallographic microscope.
Testing the hardness gradient of the infiltrated layer: the hardness gradient of the infiltrated layer was tested using a microhardness tester.
TABLE 1 hardness of nitrided layer
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (3)
1. The method for improving the structure of the nitride layer of the 1Cr13 steel film-making cover part is characterized in that the 1Cr13 steel film-making cover part is made of 1Cr13 martensite-ferrite stainless steel, and the chemical components and the weight percentage are as follows: 0.08-0.15% of C, 12.00-14.00% of Cr, less than or equal to 0.60% of Mn, less than or equal to 0.60% of Si, less than or equal to 0.60% of Ni, less than or equal to 0.03% of S, less than or equal to 0.03% of P, and the balance of Fe, and is characterized by comprising the following steps:
① inspecting, namely, inspecting the process of the incoming piece;
② vacuum denitrogenation by heating and pumping the pressure in the vacuum chamber to 6.7X 10-2Pa, maintaining at 580 deg.C of ~ 620 deg.C for 5h ~ 8h, and maintaining the pressure in the vacuum chamber at 6.7 × 10-2Pa, filling argon gas at 0.2-0.4 MPa after heat preservation is finished, cooling to below 80 ℃, and discharging;
③ inspection, checking the infiltrated tissue and hardness.
2. The method for improving the structure of the nitride layer of a 1Cr13 steel film-made covering part according to claim 1, wherein in step ②, the nitrogen-removing treatment is performed at 590 ℃ for 6 h.
3. The method for improving the structure of the nitride layer of a 1Cr13 steel film-made cover closing part according to claim 1, wherein in step ②, argon is filled at 0.3MPa after the heat preservation is finished.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215670A (en) * | 2007-01-04 | 2008-07-09 | 江苏省交通工程有限公司 | Ship lock mushroom head, mushroom head cap and processing method thereof |
| CN101890622A (en) * | 2010-08-18 | 2010-11-24 | 重庆长征重工有限责任公司 | Method for manufacturing hammer lever of electrohydraulic hammer |
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- 2017-11-28 CN CN201711209853.6A patent/CN108103284B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215670A (en) * | 2007-01-04 | 2008-07-09 | 江苏省交通工程有限公司 | Ship lock mushroom head, mushroom head cap and processing method thereof |
| CN101890622A (en) * | 2010-08-18 | 2010-11-24 | 重庆长征重工有限责任公司 | Method for manufacturing hammer lever of electrohydraulic hammer |
Non-Patent Citations (1)
| Title |
|---|
| 渗氮层中"白层"的真空处理消除工艺;苏怡兴;《材料工程》;19970430(第4期);第23-24页 * |
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