CN101538642A - Method for improving the performance of austenitic stainless steel - Google Patents
Method for improving the performance of austenitic stainless steel Download PDFInfo
- Publication number
- CN101538642A CN101538642A CN200910138584A CN200910138584A CN101538642A CN 101538642 A CN101538642 A CN 101538642A CN 200910138584 A CN200910138584 A CN 200910138584A CN 200910138584 A CN200910138584 A CN 200910138584A CN 101538642 A CN101538642 A CN 101538642A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- austenitic stainless
- heat treatment
- remelting
- performance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for improving the performance of austenitic stainless steel, which comprises a remelting treatment process and a heat treatment process; and the method is characterized by utilizing a laser processing technology combined with heat treatment to control the grain boundary character distribution of the austenitic stainless steel and preparing a corrosion resistance surface layer on the austenitic stainless steel surface, thus improving the intergranular corrosion resistance of the austenitic stainless steel. The method leads the corrosion resistance of the austenitic stainless steel surface layer to be significantly improved, simultaneously causes the heat treatment time to be significantly reduced, greatly reduces energy consumption, and is convenient to be popularized and applied.
Description
Technical field:
The present invention relates to a kind of method that improves performance of austenitic stainless steel, especially relate to and a kind ofly can control the austenite grain boundary characteristic distribution, improve austenitic stainless steel intergranular corrosion resistance performance, a kind of method that improves performance of austenitic stainless steel of the austenitic stainless steel member being carried out the original position reparation.
Background technology:
Causing a low principal element of austenitic stainless steel intergranular corrosion resistance performance is very easily sensitization of austenitic stainless steel.And sensitization will cause the appearance of material intergranular corrosion and intergranular stress corrosion, finally cause the inefficacy of member.Crystal boundary has significant effects as one of polycrystalline material important constitutional features to the performance of material.Discover that many phenomenons (crystal boundary spreads, separates out, corrodes) are closely related with the structure of crystal boundary.Low energy CSL crystal boundary (particularly
) manifested slippage, fracture, corrosion and stress corrosion cracking, sensitization and solute segregation (balance and non-equilibrium) had strong inhibitory effects, that have or even immune fully.Low energy CSL crystal boundary ubiquity in polycrystalline material, the preparation process of its frequency of occurrences and material (for example: casting, distortion, recrystallize and thermal treatment) is closely related.And free crystal boundary
Owing to have high energy and high movability, often become the passage of the core and the crack propagation of crack growth, thereby cause the appearance of intergranular corrosion crackle and intergranular stress corrosion crack.The Bian Zhongxiong professor has proposed " crystal boundary design and control " in 1984 notion is crossed by material system of northeastern Japan university.By to the design of crystal boundary type and the control of distribution, come performance to material, for example intensity, toughness and corrosion resistance nature are optimized and improve.Canadian subsequently material supply section scholar deduces this notion and is " crystal boundary engineering ".So-called crystal boundary engineering (Grain BoundaryEngineering) is exactly by certain hot machining process, come the crystal boundary distribution characteristics of control material, particularly improve the ratio of special grain boundary, and make the free crystal boundary of successive disperseization, thereby reach the purpose of control and optimization material property.What nearly all now investigator adopted all is the hot machining process of prestrain-thermal treatment or prestrain-recrystallize, and stress all is to introduce by cold rolling mode.On the one hand this method only is applicable to flat part, and for the reparation of irregularly shaped and component and inapplicable.In addition, this method often need be heat-treated (greater than 72 hours) for a long time under higher temperature, greatly increased energy consumption.
Summary of the invention:
The object of the present invention is to provide a kind of cost low, utilize the laser surface remelting technology to regulate and control the crystal boundary characteristic distribution of austenitic stainless steel in conjunction with high-temperature heat treatment, the corrosion resistance nature on austenitic stainless steel top layer is improved, the austenitic stainless steel member is carried out the original position reparation, a kind of method that improves performance of austenitic stainless steel that heat treatment time is significantly shortened.
Purpose of the present invention is implemented by following technical scheme: a kind of novel method that improves performance of austenitic stainless steel, and it includes following steps: (1) remelting treatment process and (2) heat treatment step; Wherein
(1) remelting treatment process: under protection of inert gas, utilize laser apparatus that the austenitic stainless steel that has cleaned is carried out surface remelting and handle;
(2) heat treatment step: with the thermal treatment temp of the described austenitic stainless steel of laser beam surface remelting is 920-960 ℃, and heat treatment time is 20-40 hour, takes out shrend, promptly.
The invention has the advantages that: the present invention is the crystal boundary characteristic distribution of utilizing the laser processing technology linkage heat to handle to control austenitic stainless steel, on the anti-corrosion top layer of austenitic stainless steel surface preparation, thereby the intergranular corrosion resistance ability this method that improves austenitic stainless steel makes the corrosion resistance nature on austenitic stainless steel top layer obtain significant raising, heat treatment time is significantly shortened, greatly reduced energy consumption, easy to utilize.
Specific embodiments:
Embodiment 1: a kind of novel method that improves performance of austenitic stainless steel, and it includes following steps: (1) remelting treatment process; (2) heat treatment step; Wherein
(1) remelting treatment process: (a) stainless steel plate that 10mm is thick is cut into the fritter of 15 * 40mm, and with sand papering to 600#, use acetone and each 10min of ethanol ultrasonic cleaning sample subsequently.(b) the stainless steel plate sample of handling well is placed the laser processing worktable, adjust laser output power, sweep velocity and spot size, under argon shield, sample is carried out surface remelting and handle.Laser melting process parameter can be in following scope: laser beam flying speed 5-50mm/s, output rating 700-1500W, spot diameter 3mm-4mm, shielding gas argon flow amount 15L/min, overlapping rate 30%-40%.Laser melting process parameter only need guarantee the remelting of stainless steel plate specimen surface is got final product.
(2) heat treatment step: the stainless steel plate sample of laser beam surface remelting 947 ℃ of thermal treatments of carrying out 28 hours, is taken out shrend, promptly.
Embodiment 2: a kind of novel method that improves performance of austenitic stainless steel, and it includes following steps: (1) remelting treatment process and (2) heat treatment step; Wherein
(1) remelting treatment process: (a) stainless steel plate that 10mm is thick is cut into the fritter of 15 * 40mm, and with sand papering to 600#, use acetone and each 10min of ethanol ultrasonic cleaning sample subsequently.(b) the stainless steel plate sample of handling well is placed the laser processing worktable, adjust laser output power, sweep velocity and spot size, under argon shield, sample is carried out surface remelting and handle.Laser melting process parameter can be in following scope: laser beam flying speed 5-50mm/s, output rating 700-1500W, spot diameter 3mm-4mm, shielding gas argon flow amount 15L/min, overlapping rate 30%-40%.Laser melting process parameter only needs the remelting of stainless steel plate specimen surface is got final product.
(2) heat treatment step; The stainless steel plate sample of laser beam surface remelting 920 ℃ of thermal treatments of carrying out 40 hours, is taken out shrend, promptly.
Embodiment 3: a kind of novel method that improves performance of austenitic stainless steel, and it includes following steps: (1) remelting treatment process and (2) heat treatment step; Wherein
(1) remelting treatment process: (a) stainless steel plate that 10mm is thick is cut into the fritter of 15 * 40mm, and with sand papering to 600#, use acetone and each 10min of ethanol ultrasonic cleaning sample subsequently.(b) the stainless steel plate sample of handling well is placed the laser processing worktable, adjust laser output power, sweep velocity and spot size, under argon shield, sample is carried out surface remelting and handle.Laser melting process parameter can be in following scope: laser beam flying speed 5-50mm/s, output rating 700-1500W, spot diameter 3mm-4mm, shielding gas argon flow amount 15L/min, overlapping rate 30%-40%.Laser melting process parameter only need guarantee the remelting of stainless steel plate specimen surface is got final product.
(2) heat treatment step; The stainless steel plate sample of laser beam surface remelting 960 ℃ of thermal treatments of carrying out 20 hours, is taken out shrend, promptly.
Embodiment 4:
Further specify the optimization effect of erosion resistance of the present invention and crystal boundary characteristic distribution below by above embodiment 1-3 and Comparative Examples.
The high performance austenitic stainless steel of embodiment 1-3 gained is done corrosion experiment, thereby further obtain reactivate current ratio and corrosion speed.
Concrete experiment is as follows:
In 0.5M H2SO4+0.01M KSCN solution embodiment 1-3 gained material is carried out electrochemical corrosion experimental under the normal temperature, the reactivate current ratio changed with sensitizing temperature and time, listed in table 1 at the reactivate current ratio that 650 ℃ of sensitizations recorded in 2 hours.
After 2 hours, the corrosion speed that records after corrosion in 72 hours in boiling sulfuric acid-copperas solution is listed in table 1 to embodiment 1-3 gained material 650 ℃ of sensitizations.
Comparative Examples: for the difference on comparison process material and starting materials tissue and the performance, get one of starting materials 1050 ℃ of solution treatment 30 minutes, subsequently 650 ℃ of sensitizations 2 hours, in 0.5M H2SO4+0.01M KSCN solution, carry out electrochemical corrosion experimental at normal temperatures then to handling material, carry out chemical corrosion in 72 hours experiment in boiling sulfuric acid-copperas solution, test result is listed in table 1.
In above embodiment 1-3 and Comparative Examples, represent the optimization effect of material crystal boundary characteristic distribution with special grain boundary percentage ratio (%), being worth high more explanation crystal boundary, to optimize effect good more; With reactivate current ratio (%) and corrosion speed (gm
-2H
-1) represent the erosion resistance of material respectively, the reactivate current ratio is low more, and the corrosion speed value is more little, and the erosion resistance of illustrative material is good more.The ratio of special grain boundary (∑≤29) in the processing layer is reached more than 83%.Can find that under identical sensitization condition, the corrosion resistance nature of grain boundary structure optimization sample is greatly improved than the corrosion resistance nature of starting materials.
Table 1 test result
Claims (1)
1, a kind of novel method that improves performance of austenitic stainless steel, it is characterized in that: it includes following steps:
(1) remelting treatment process; (2) heat treatment step; Wherein
(1) remelting treatment process: under protection of inert gas, utilize laser apparatus that the austenitic stainless steel that has cleaned is carried out surface remelting and handle;
(2) heat treatment step: with the thermal treatment temp of the described austenitic stainless steel of laser beam surface remelting is 920-960 ℃, and heat treatment time is 20-40 hour, takes out shrend promptly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910138584A CN101538642A (en) | 2009-05-08 | 2009-05-08 | Method for improving the performance of austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910138584A CN101538642A (en) | 2009-05-08 | 2009-05-08 | Method for improving the performance of austenitic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101538642A true CN101538642A (en) | 2009-09-23 |
Family
ID=41122027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910138584A Pending CN101538642A (en) | 2009-05-08 | 2009-05-08 | Method for improving the performance of austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101538642A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384926A (en) * | 2018-03-15 | 2018-08-10 | 温州市赢创新材料技术有限公司 | A kind of local laser process of surface treatment of austenitic stainless steel |
| CN108754386A (en) * | 2018-07-27 | 2018-11-06 | 北方工业大学 | Thermal shock resistant MCrAlY coating and preparation method thereof |
-
2009
- 2009-05-08 CN CN200910138584A patent/CN101538642A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384926A (en) * | 2018-03-15 | 2018-08-10 | 温州市赢创新材料技术有限公司 | A kind of local laser process of surface treatment of austenitic stainless steel |
| CN108384926B (en) * | 2018-03-15 | 2019-11-12 | 温州市赢创新材料技术有限公司 | A kind of local laser process of surface treatment of austenitic stainless steel |
| CN108754386A (en) * | 2018-07-27 | 2018-11-06 | 北方工业大学 | Thermal shock resistant MCrAlY coating and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110551955B (en) | Method for reducing internal residual stress of GH4169 alloy large-size disc forging | |
| Janschek | Wrought TiAl blades | |
| CN101294264A (en) | Process for manufacturing type alpha+beta titanium alloy rod bar for rotor impeller vane | |
| CN111218631B (en) | Method for preparing high-strength-and-toughness TC21 titanium alloy gradient structure | |
| US10107112B2 (en) | Method for producing forged components from a TiAl alloy and component produced thereby | |
| EP2423340A1 (en) | Process and system for fabricating gamma tial turbine engine components | |
| CN107649682A (en) | The method of ultrasonic impact and sensing heating refining laser increasing material manufacturing titanium alloy crystal grain | |
| CN105177262A (en) | Method for increasing proportion of special grain boundaries in precipitation strengthened austenitic heat-resistance steel | |
| CN103333997A (en) | Annealing heat treatment method of H13 die steel | |
| CN102965479B (en) | Method for quickly preparing high-corrosion-resistance austenitic stainless steel surface layer | |
| CN106435332A (en) | Manufacturing method for 40CrNiMoA medium-carbon alloy steel wind power main shaft of low wind speed wind power unit | |
| CN101538642A (en) | Method for improving the performance of austenitic stainless steel | |
| CN103215415B (en) | Method for quickly improving corrosion resistance of material surface in situ | |
| CN116117163A (en) | Method for regulating alloy grain boundary structure by ultrasonic micro-forging auxiliary laser selective melting | |
| CN103056627A (en) | Forming method of high-precision closed blisk | |
| CN106435405A (en) | 42CrMo4 wind power main shaft after-forging heat treatment method of low-wind-speed wind turbine generator | |
| CN102031344A (en) | Method for controlling grain boundary characteristics of austenitic stainless steel | |
| CN112756769B (en) | Titanium alloy friction welding joint optimization method based on thermal coupling condition | |
| CN102605153A (en) | Method for preparing high-silicon electric steel band material through rolling at medium and low temperature | |
| CN103097555A (en) | Martensitic stainless steel machineability optimization | |
| CN103045830A (en) | Surface shot blasting process for improving high temperature steam oxidization resistance of high-chromium austenite steel | |
| CN108754371B (en) | Preparation method of refined α -close high-temperature titanium alloy grains | |
| CN106086734A (en) | The forging method of 2618A aluminum alloy impeller forging | |
| CN102560043A (en) | Heat treatment process for large 35CrMo steel axis forgings | |
| CN114381678B (en) | GH5188 high-temperature alloy material, and heat treatment method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20090923 |