CN110699619A - Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material - Google Patents
Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material Download PDFInfo
- Publication number
- CN110699619A CN110699619A CN201911098308.3A CN201911098308A CN110699619A CN 110699619 A CN110699619 A CN 110699619A CN 201911098308 A CN201911098308 A CN 201911098308A CN 110699619 A CN110699619 A CN 110699619A
- Authority
- CN
- China
- Prior art keywords
- silicon alloy
- hypereutectic aluminum
- cryogenic treatment
- alloy piston
- piston material
- 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.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention relates to a cryogenic treatment process of a hypereutectic aluminum-silicon alloy piston material, belonging to the technical field of heat treatment of hypereutectic aluminum-silicon alloy piston materials. The invention utilizes the mode of combining long-time cryogenic treatment and short-time cryogenic treatment to treat the hypereutectic aluminum-silicon alloy piston material. The invention has the following advantages: the strength and the hardness of the hypereutectic aluminum-silicon alloy can be effectively improved, and the eutectic silicon structure is refined; the treatment process provided by the invention is economical and convenient and has high treatment efficiency.
Description
Technical Field
The invention relates to the technical field of heat treatment of a hypereutectic aluminum-silicon alloy piston material, in particular to a cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material.
Background
Hypoeutectic and eutectic silicon-aluminum alloys are widely used in the production of pistons for automobiles and motorcycles. However, the fatal problems of hypoeutectic and eutectic silicon-aluminum alloy in practical application are that the size stability of a piston is poor, the anti-seizure load capacity is poor, and the irreversible expansion of the volume is generated at high temperature so as to cause the phenomenon of 'cylinder seizure', so that an engine cannot normally work. On the basis of eutectic aluminum-silicon alloy, the high-silicon hypereutectic aluminum-silicon alloy is obtained by increasing the Si content, the high-temperature mechanical property, the wear resistance, the dimensional stability and the seizure resistance of the hypereutectic aluminum-silicon alloy are greatly improved, but the requirement of stable work of a piston cannot be met.
According to the cryogenic treatment process provided by the invention, the strength and hardness of the material are effectively improved by carrying out cryogenic treatment on the hypereutectic aluminum-silicon alloy piston material for multiple times.
Disclosure of Invention
The invention provides a cryogenic treatment process of a hypereutectic aluminum-silicon alloy piston material, which can effectively improve the strength and hardness of the material, aiming at solving the technical problem that the existing hypereutectic aluminum-silicon alloy piston material cannot meet the requirement of stable operation of a piston.
The invention is realized by the following technical scheme: a cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material is characterized by comprising the following steps:
step 1: placing the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device at the temperature of-120 ℃ to-110 ℃ for slow cooling for 20min to 30 min;
step 2: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen to carry out cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-196 ℃ to-160 ℃, and the cooling time is 30 min;
and step 3: directly taking out the hypereutectic aluminum-silicon alloy piston material from liquid nitrogen, placing the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device with the initial temperature of-120 to-110 ℃, slowly heating to 25 ℃, wherein the heating speed is 3 ℃/min to 4.5 ℃/min; then standing for 20 min-30 min at 25 ℃;
and 4, step 4: repeating the step 1 to the step 3 for one time;
and 5: repeating the step 1 once;
step 6: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen to carry out cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-196 ℃ to-160 ℃, and the cooling time is 12 hours;
and 7: repeating the step 3;
and 8: and (3) placing the workpiece in a muffle furnace with the set control temperature of 200 ℃ for tempering for 1h to eliminate stress, and then air-cooling to room temperature.
The material treated by the process is hypereutectic aluminum-silicon alloy.
The cryogenic treatment equipment used in the step 2 and the step 6 in the process is an upper opening type vacuum heat insulation container with a volume of 30 liters, the heat insulation mode is a high-vacuum multi-layer multi-screen heat insulation mode, and liquid nitrogen is located in the cryogenic treatment equipment.
The muffle furnace used in the step 8 is a program-controlled heating muffle furnace, the control precision is +/-1 ℃, and the rated maximum heating temperature is 1600 ℃.
The temperature range of the programmable temperature control device used in the steps 1 and 3 is-130 ℃ to 150 ℃, the maximum temperature rise speed is 5 ℃/min, the maximum temperature reduction speed is 3 ℃/min, and the temperature control precision is +/-1 ℃.
Compared with the prior art, the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material has the following beneficial effects:
1. the method can effectively improve the strength and the hardness of the hypereutectic aluminum alloy and refine the eutectic silicon structure.
2. The treatment process provided by the invention is economical and convenient and has high treatment efficiency.
Drawings
FIG. 1 shows the tensile condition of a sample treated by the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material and an untreated sample.
FIG. 2 is a 500 times enlarged gold phase diagram of a sample treated by the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material and an untreated sample.
FIG. 3 is a 5000 times magnified gold phase diagram of a sample treated by the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material and an untreated sample.
FIG. 4 shows the hardness of a sample treated by the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material and the hardness of an untreated sample.
FIG. 5 is a flow chart of a cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material of the present invention.
Detailed Description
The technical scheme of the cryogenic treatment process of the hypereutectic aluminum-silicon alloy piston material is further described below by combining the attached drawings.
In order to compare the effects of the process recorded by the invention, different samples are made of hypereutectic aluminum-silicon alloy piston materials of the same batch, and the samples are divided into two groups, one group is an experimental group, and the other group is a control group, wherein the experimental group is treated according to the cryogenic treatment process of the invention, and the control group is not treated; the samples were prepared and labeled as follows: two groups of tensile samples, two groups of metallographic samples and two groups of hardness samples are taken from the same batch of cast finished products, the tensile samples are processed into phi 5mm multiplied by 50mm standard tensile test bars, each group comprises three tensile test bars, the experimental groups are respectively numbered as Ta1, Ta2 and Ta3, and the comparison groups are respectively numbered as Tb1, Tb2 and Tb 3; processing a metallographic experiment into cylinders with the diameter of 18mm multiplied by 30mm, wherein each group is provided with one sample, the number of the sample in the experimental group is Ja, and the number of the sample in the control group is Jb; the hardness test pieces were processed into a cylindrical shape of 18mm in diameter by 30mm in diameter, one for each group, and the test piece was numbered BYa for the experimental group and BYb for the control group.
Example 1: a cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material is characterized by comprising the following steps:
step 1: slowly cooling the hypereutectic aluminum-silicon alloy piston material for 30min in a programmable temperature control device with the temperature of-120 ℃;
step 2: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen for cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-160 ℃, and the cooling time is 30 min;
and step 3: directly taking out the hypereutectic aluminum-silicon alloy piston material from liquid nitrogen, placing the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device with the initial temperature of-120-DEG C, slowly heating to 25 ℃, and heating at the speed of 3 ℃/min; standing at 25 deg.C for 30 min;
and 4, step 4: repeating the step 1 to the step 3 for one time;
and 5: repeating the step 1 once;
step 6: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen for cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-160 ℃, and the cooling time is 12 hours;
and 7: repeating the step 3;
and 8: and (3) placing the workpiece in a muffle furnace with the set control temperature of 200 ℃ for tempering for 1h to eliminate stress, and then air-cooling to room temperature.
The material treated by the process is hypereutectic aluminum-silicon alloy.
The cryogenic treatment equipment used in the step 2 and the step 6 in the process is an upper opening type vacuum heat insulation container with a volume of 30 liters, the heat insulation mode is a high-vacuum multi-layer multi-screen heat insulation mode, and liquid nitrogen is located in the cryogenic treatment equipment.
The muffle furnace used in the step 8 is a program-controlled heating muffle furnace, the control precision is +/-1 ℃, and the rated maximum heating temperature is 1600 ℃.
The temperature range of the programmable temperature control device used in the steps 1 and 3 is-130 ℃ to 150 ℃, the maximum temperature rise speed is 5 ℃/min, the maximum temperature reduction speed is 3 ℃/min, and the temperature control precision is +/-1 ℃.
The material of the experimental group was treated according to the process of example 1, the material of the control group was not treated at all, and then the mechanical parameters and the metallographic phase of the material of the experimental group and the control group were measured respectively, wherein in the tensile test, three samples of the same group were measured respectively, and then the average value was taken.
FIG. 1 shows the tensile conditions of the experimental group material and the comparative group material, and it can be seen from the drawing that the strength of the hypereutectic aluminum-silicon alloy piston material is improved to a certain extent after the cryogenic treatment by the process provided by the invention.
Fig. 2 shows the metallographic phase of the experimental group material and the comparative group material amplified by 500 times, wherein the metallographic phase of the comparative group material is on the left side, and the metallographic phase of the experimental group material is on the right side.
FIG. 3 shows the metallographic phase of the experimental group material and the comparative group material amplified by 5000 times, wherein the metallographic phase of the comparative group material is on the left side, and the metallographic phase of the experimental group material is on the right side, and it can be seen from the metallographic phase that after the cryogenic treatment by the process provided by the invention, the micro precipitated particles inside the hypereutectic aluminum-silicon alloy piston material structure are obviously increased, and the size of the dendrite is crushed from about 10 μm to about 5 μm.
FIG. 4 shows the hardness of the experimental material and the comparative material, and it can be seen that the hardness of the hypereutectic Al-Si alloy piston material is improved to a certain extent after the cryogenic treatment by the process provided by the invention.
Claims (5)
1. A cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material is characterized by comprising the following steps:
step 1: placing the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device at the temperature of-120 ℃ to-110 ℃ for slow cooling for 20min to 30 min;
step 2: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen to carry out cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-196 ℃ to-160 ℃, and the cooling time is 30 min;
and step 3: directly taking out the hypereutectic aluminum-silicon alloy piston material from liquid nitrogen, placing the hypereutectic aluminum-silicon alloy piston material in a programmable temperature control device with the initial temperature of-120 to-110 ℃, slowly heating to 25 ℃, wherein the heating speed is 3 ℃/min to 4.5 ℃/min; then standing for 20 min-30 min at 25 ℃;
and 4, step 4: repeating the step 1 to the step 3 for one time;
and 5: repeating the step 1 once;
step 6: placing the hypereutectic aluminum-silicon alloy piston material into liquid nitrogen to carry out cryogenic treatment by a liquid method, wherein the temperature of the liquid nitrogen is-196 ℃ to-160 ℃, and the cooling time is 12 hours;
and 7: repeating the step 3;
and 8: and (3) placing the workpiece in a muffle furnace with the set control temperature of 200 ℃ for tempering for 1h to eliminate stress, and then air-cooling to room temperature.
2. The cryogenic treatment process for a hypereutectic aluminum-silicon alloy piston material according to claim 1, characterized in that the material treated by the process is a hypereutectic aluminum-silicon alloy.
3. The cryogenic treatment process for the hypereutectic aluminum-silicon alloy piston material, according to claim 2, characterized in that the cryogenic treatment equipment used in the steps 2 and 6 in the process is an upper-opening vacuum heat-insulating container with a volume of 30 liters, the heat insulation mode is a high-vacuum multi-layer multi-screen heat insulation mode, and liquid nitrogen is located in the cryogenic treatment equipment.
4. The cryogenic treatment process for the hypereutectic aluminum-silicon alloy piston material according to claim 3, wherein the muffle furnace used in the step 8 is a program-controlled heating muffle furnace, the control precision is +/-1 ℃, and the rated maximum heating temperature is 1600 ℃.
5. The cryogenic treatment process for the hypereutectic aluminum-silicon alloy piston material according to claim 4, wherein the temperature range of the programmable temperature control device used in the steps 1 and 3 is-130 ℃ to 150 ℃, the maximum temperature rise speed is 5 ℃/min, the maximum temperature drop speed is 3 ℃/min, and the temperature control precision is +/-1 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911098308.3A CN110699619B (en) | 2019-11-12 | 2019-11-12 | Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911098308.3A CN110699619B (en) | 2019-11-12 | 2019-11-12 | Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110699619A true CN110699619A (en) | 2020-01-17 |
| CN110699619B CN110699619B (en) | 2021-11-19 |
Family
ID=69205764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911098308.3A Active CN110699619B (en) | 2019-11-12 | 2019-11-12 | Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110699619B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120388A (en) * | 1994-10-26 | 1996-05-14 | Mitsubishi Alum Co Ltd | Aluminum alloy hollow shape excellent in bendability and production of the shape |
| US20080196801A1 (en) * | 2005-09-07 | 2008-08-21 | The Regents Of The University Of California | Preparation of nanostructured materials having improved ductility |
| CN102978486A (en) * | 2012-11-13 | 2013-03-20 | 安徽春辉仪表线缆集团有限公司 | Aluminum alloy casting forming method for valve clack of sluice valve |
| CN103060583A (en) * | 2012-12-14 | 2013-04-24 | 安徽润鑫泰达智能系统工程有限公司 | Method for refining hypo eutectic aluminum-silicon alloy structure |
| CN103469128A (en) * | 2013-09-29 | 2013-12-25 | 常州市润源经编机械有限公司 | Treating method for improving strength and toughness of aluminum alloy materials |
| CN103498117A (en) * | 2013-09-29 | 2014-01-08 | 三明学院 | Subzero treatment method for cast aluminium alloy piston component |
| CN103525997A (en) * | 2013-09-29 | 2014-01-22 | 三明学院 | High-speed steel cryogenic treatment process |
| CN106498245A (en) * | 2016-10-09 | 2017-03-15 | 江苏大学 | A kind of high-strength cast aluminum-silicon alloy of subzero treatment reinforcing and its preparation technology |
| CN107245677A (en) * | 2017-07-05 | 2017-10-13 | 合肥思博特软件开发有限公司 | A kind of counter body of use carbon fiber aluminum alloy composite materials |
| CN109652623A (en) * | 2018-12-20 | 2019-04-19 | 南京理工大学 | The high all cyclic cryogenic treatment technique of metal and automation deep cooling processing system |
-
2019
- 2019-11-12 CN CN201911098308.3A patent/CN110699619B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08120388A (en) * | 1994-10-26 | 1996-05-14 | Mitsubishi Alum Co Ltd | Aluminum alloy hollow shape excellent in bendability and production of the shape |
| US20080196801A1 (en) * | 2005-09-07 | 2008-08-21 | The Regents Of The University Of California | Preparation of nanostructured materials having improved ductility |
| CN102978486A (en) * | 2012-11-13 | 2013-03-20 | 安徽春辉仪表线缆集团有限公司 | Aluminum alloy casting forming method for valve clack of sluice valve |
| CN103060583A (en) * | 2012-12-14 | 2013-04-24 | 安徽润鑫泰达智能系统工程有限公司 | Method for refining hypo eutectic aluminum-silicon alloy structure |
| CN103469128A (en) * | 2013-09-29 | 2013-12-25 | 常州市润源经编机械有限公司 | Treating method for improving strength and toughness of aluminum alloy materials |
| CN103498117A (en) * | 2013-09-29 | 2014-01-08 | 三明学院 | Subzero treatment method for cast aluminium alloy piston component |
| CN103525997A (en) * | 2013-09-29 | 2014-01-22 | 三明学院 | High-speed steel cryogenic treatment process |
| CN106498245A (en) * | 2016-10-09 | 2017-03-15 | 江苏大学 | A kind of high-strength cast aluminum-silicon alloy of subzero treatment reinforcing and its preparation technology |
| CN107245677A (en) * | 2017-07-05 | 2017-10-13 | 合肥思博特软件开发有限公司 | A kind of counter body of use carbon fiber aluminum alloy composite materials |
| CN109652623A (en) * | 2018-12-20 | 2019-04-19 | 南京理工大学 | The high all cyclic cryogenic treatment technique of metal and automation deep cooling processing system |
Non-Patent Citations (2)
| Title |
|---|
| 晋芳伟等: "高速钢深冷处理技术的研究现状及应用展望", 《热加工工艺》 * |
| 田振乾等: "深冷处理铝硅合金的微观组织与力学性能", 《金属热处理》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110699619B (en) | 2021-11-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2640695C2 (en) | Nickel-cobalt alloy | |
| CN106636740B (en) | The method that TiAl alloy sheet material is prepared without jacket | |
| CN106555076A (en) | A kind of resistance to 650 DEG C of high-temperature titanium alloy materials and preparation method thereof | |
| CN103388095B (en) | Mg-Gd-Y-Zr series magnesium alloy and the heat treatment method of large-scaled complex castings thereof | |
| CN104561857A (en) | Aluminum alloy two-stage aging heat treatment process | |
| Jiang et al. | Microstructure and mechanical properties of AZ61 magnesium alloy parts achieved by thixo-extruding semisolid billets prepared by new SIMA | |
| CN115537613A (en) | New energy automobile motor shell aluminum alloy and forming method thereof | |
| Qiu et al. | Optimizing the hot-forging process parameters for connecting rods made of PM titanium alloy | |
| CN110699619B (en) | Cryogenic treatment process for hypereutectic aluminum-silicon alloy piston material | |
| CN113843387B (en) | High-strength heat-resistant magnesium alloy large forging and preparation method thereof | |
| CN103225028A (en) | Al-Er-Zr-Si heat-resistant aluminum alloy and its heat treatment technology | |
| CN109371341B (en) | Processing method for improving toughness and dimensional stability of whisker reinforced aluminum matrix composite forging stock | |
| CN105220096B (en) | A kind of multistep cycle heat treatment method improving conventional cast γ TiAl alloy mechanical property | |
| CN115418513B (en) | High-strength heat-resistant cast aluminum-silicon alloy and heat treatment method thereof | |
| DONG et al. | Effect of alloying on high temperature fatigue performance of ZL114A (Al–7Si) alloy | |
| CN107876725B (en) | Preparation method of magnesium alloy steering wheel framework | |
| WO2020052129A1 (en) | Rare-earth aluminum alloy material having high ductility and high strength and preparation method therefor | |
| CN108588502A (en) | A kind of preparation method of aluminium alloy extrusions | |
| Cui et al. | Development of low‐melting‐point filler materials for laser beam brazing of aluminum alloys: Entwicklung von Lötdrähten mit niedriger Schmelztemperatur für das Laserstrahllöten von Aluminium | |
| CN115138800A (en) | Forging method for obtaining TC2 titanium alloy small forging with high impact toughness | |
| Wang et al. | Effect of heat treatment on mechanical properties of thixoformed 7A09 aluminum alloy | |
| Eylon et al. | Titanium net-shape technologies | |
| RU2595079C1 (en) | METHOD OF HIGH-TEMPERATURE THERMOMECHANICAL PROCESSING OF SEMIS FROM (α+β) TITANIUM ALLOYS | |
| RU2606685C1 (en) | METHOD FOR THERMOMECHANICAL TREATMENT OF CAST (γ+α2)-INTERMETALLIC ALLOYS BASED ON TITANIUM ALUMINIDE γ-TiAl | |
| Min et al. | Technology of alloy VZh175 preparation for GTE disks from conditioned waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |