CN102226228A - Technology for testing pearlite in low carbon steel structure in mesophase spheroidizing annealing - Google Patents
Technology for testing pearlite in low carbon steel structure in mesophase spheroidizing annealing Download PDFInfo
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- CN102226228A CN102226228A CN 201110151537 CN201110151537A CN102226228A CN 102226228 A CN102226228 A CN 102226228A CN 201110151537 CN201110151537 CN 201110151537 CN 201110151537 A CN201110151537 A CN 201110151537A CN 102226228 A CN102226228 A CN 102226228A
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Abstract
The invention discloses a technology for testing a pearlite in a low carbon steel structure in mesophase spheroidizing annealing, wherein, the technology comprises the following stages, a heating stage: heating a sample of the low carbon steel to a test temperature between a complete austenitic temperature Ac3 and a pearlite transition temperature Ac1; an insulation stage: maintaining for a certain insulation time according to the test temperature; a cooling stage: precipitating and depositing a carbide on a fine carbide core through the proper cooling temperature, finally forming carbide particles shaped in a similar to a spherical shape for achieving the effect of spheroidizing pearlite. According to the technical schemes, a plurality of intersect tests for determining process parameters can be avoided, and the frequencies and the time of tests can be also reduced; the structural and mechanical properties can be improved, the production efficiency can be improved as well as energy consumption can be reduced, the technology provided in the invention has high economic values in the production process.
Description
Technical field
The invention belongs to the technical field of Analysis of Metallic Materials and test, relate to the heat treatment technics of improving metal material tissue and performance, more particularly, the present invention relates to the test technology that intermediate phase annealing nodularization middle low carbon steel is organized Medium pearlite.
Background technology
The mechanism of traditional nodularization perlite technology utilization diffusion nodularization changes the perlite form, length consuming time, and the test period is big.
The spheriodizing technique that novel in recent years utilization " divorce eutectoid " mechanism is carried out is the important directions of following nodularization thermal treatment process development, has cycle weak point, the characteristics that energy consumption is little than traditional spheriodizing technique.
The spheriodizing technique that utilizes " divorce eutectoid " mechanism to carry out need have accurate control respectively to processing parameters such as Heating temperature, soaking time, speed of cooling, obtains nodularization effect preferably so that processing parameter combines.Be directed to three processing parameters and carry out a large amount of cross-over experiments with regard to needing like this, finally obtain a proper process program.So, the process program of determining a certain steel grade need expend a large amount of time and a large amount of goods and materials of waste.
Along with the raising of knowwhy and the development of experimental level, have the optimum parameter of definite this spheriodizing technique that increasing method can be easier.
Summary of the invention
The problem that the present invention solves provides the test technology that a kind of intermediate phase annealing nodularization middle low carbon steel is organized Medium pearlite, its objective is and improves its tissue and mechanical property, and reduce the number of times and the time of test.
To achieve these goals, the technical scheme taked of the present invention is:
Intermediate phase annealing nodularization middle low carbon steel provided by the present invention organizes the test technology of Medium pearlite to comprise heating phase, holding stage, cooling stages, and its technology content is:
Heating phase: the sample of middle low carbon steel is heated to complete austenitic temperature Ac
3With perlitic transformation temperature Ac
1Between a test temperature, at this moment the tissue in the sheet perlite dissolving, fracture have taken place;
Holding stage: by continue certain soaking time in described test temperature, make dissolving just, fracture and form inhomogeneous and irregular granular perlite and further dissolve, form the core of tiny carbide;
Cooling stages: by suitable speed of cooling, make carbide separate out and be deposited on the tiny carbide core that final formation is similar to the globular carbide particle, reaches the pearlitic effect of nodularization.
In addition, when can't reach desired spheroidized carbide effect in the continuous refrigerative mode of cooling stages utilization the time, then at the Ar that is cooled to this kind steel grade
1Adding waits thermophase during temperature, carries out the insulation of certain hour, makes carbide fully separate out and is deposited on the tiny carbide core.
More specifically:
1, determining of described Heating temperature:
When described sample is heated to described test temperature, sample is taken out quenching immediately, metallographic preparation is afterwards also carried out structure observation, the distribution of faults situation of mainly observing carbide particle on martensitic matrix; Through said process repeatedly, determine only Heating temperature T according to resulting best relatively tissue.
2, determining of described soaking time:
After having determined best Heating temperature T, formulate several different soaking time under this temperature, when temperature is heated to T, be incubated this several times respectively, take out the metallographic preparation of sample quenching back, carry out structure observation, mainly observe the size and the distribution situation of carbide particle; The carbide size is tiny carbide core, and the distribution disperse is a better tissues; In above-mentioned several different soaking times, determine that according to the tissue of resultant the best only soaking time is H.
3, determining of described speed of cooling:
According to determine best Heating temperature T and only soaking time H, formulating different speed of cooling cools off, and final to be organized as the distribution disperse even, and sizeable carbide particle be that the best is organized; In above-mentioned different speed of cooling, determine only speed of cooling C according to the tissue of resultant the best.
4, determining of isothermal time:
When the speed of cooling of above-mentioned test does not reach described the requirement, then adopt the method for thermophase such as adding in process of cooling, make carbide fully separate out and be deposited on the tiny carbide core; Adopt several different isothermal times to test respectively; In above-mentioned several different isothermal times, determine only isothermal time H1 according to the tissue of resulting the best.
The present invention adopts technique scheme, utilize quenching assay to determine optimum process parameters respectively, comprise Heating temperature, soaking time, speed of cooling and isothermal time, avoid to carry out a large amount of cross matchings, reduced the number of times and the time of test for determining that technology is joined; Middle low carbon steel by using the pearlitic technology of intermediate phase annealing nodularization, is improved its tissue and mechanical property, and the mode of employing " divorce eutectoid " reduces the time of nodularization process; Can enhance productivity simultaneously, reduce the consumption of the energy, in actual production, have the economic worth of clear height.
Embodiment
Below the specific embodiment of the present invention is described in further detail, inventive concept of the present invention, technical scheme is had more complete, accurate and deep understanding to help those skilled in the art.
The present invention is to provide a kind of intermediate phase annealing nodularization middle low carbon steel and organize the test technology of Medium pearlite.In order to solve the problem that exists at the described present known technology of this specification sheets background technology part and to overcome its defective, realize improving tissue and mechanical property, the number of times of minimizing test and the goal of the invention of time of material, the technical scheme that the present invention takes is:
Above-described intermediate phase annealing nodularization middle low carbon steel organizes the test technology of Medium pearlite to comprise heating phase, holding stage, cooling stages, and its technology content is:
Heating phase: the sample of middle low carbon steel is heated to complete austenitic temperature Ac
3With perlitic transformation temperature Ac
1Between a test temperature, at this moment the tissue in the sheet perlite dissolving, fracture have taken place;
Holding stage: by continue certain soaking time in described test temperature, make dissolving just, fracture and form inhomogeneous and irregular granular perlite and further dissolve, form the core of tiny carbide;
Cooling stages: by suitable speed of cooling, make carbide separate out and be deposited on the tiny carbide core that final formation is similar to the globular carbide particle, reaches the pearlitic effect of nodularization.
In addition, when can't reach desired spheroidized carbide effect in the continuous refrigerative mode of cooling stages utilization the time, then at the Ar that is cooled to this kind steel grade
1Adding waits thermophase during temperature, carries out the insulation of certain hour, makes carbide fully separate out and is deposited on the tiny carbide core.
Effect of the present invention is:
Be directed to the effect that middle low carbon steel effectively reaches the nodularization pearlitic structure, improve traditional nodularization, the mode of this process using " divorce eutectoid " reduces the time of nodularization process, reduces the consumption of the energy, thereby has certain economic to be worth.
Utilize quenching assay to determine Heating temperature, soaking time processing parameter respectively, avoid to carry out a large amount of cross matchings, reduced the number of times and the time of test for determining that technology is joined.
Concrete embodiment is:
Above-described heating phase, holding stage, cooling stages, this three phases need specific test to determine Heating temperature, soaking time, these three processing parameters of speed of cooling respectively.
Determining of Heating temperature:
Can pre-determine tissue is heated to complete austenitic temperature (Ac
3) and perlitic transformation temperature (Ac
1) between a certain temperature; When sample is heated to this temperature, sample is taken out quenching immediately, structure observation is carried out in metallographic preparation afterwards, and the distribution of faults situation of mainly observing carbide particle on martensitic matrix is determined best Heating temperature T according to relative better tissues.
Determining of soaking time:
Determined best Heating temperature T according to a last test, several different soaking time of formulation under this temperature, when temperature is heated to T, be incubated this several times respectively, take out the back metallographic preparation of quenching, carry out structure observation, main size and distribution situation of observing carbide particle, the carbide size is tiny carbide core, and the distribution disperse is a better tissues, determines that according to the tissue of the best only soaking time is H.
Determining of speed of cooling:
Determine the Heating temperature T and the only soaking time H of the best according to preceding two stages, formulating different speed of cooling cools off, final to be organized as the distribution disperse even, and sizeable carbide particle be best tissue, according to the definite only speed of cooling C of the best tissue.
Determining of isothermal time:
When the speed of cooling of test does not reach certain requirement, can adopt the method for thermophase such as addings grade in process of cooling, make carbide fully separate out and be deposited on the tiny carbide core.Can adopt several different isothermal times to test equally respectively, determine best isothermal time H1 according to the final situation of organizing.
Above the present invention has been carried out exemplary description; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (6)
1. intermediate phase annealing nodularization middle low carbon steel is organized the test technology of Medium pearlite, and it is characterized in that: described test technology comprises heating phase, holding stage, cooling stages, and its technology content is:
Heating phase: the sample of middle low carbon steel is heated to complete austenitic temperature Ac
3With perlitic transformation temperature Ac
1Between a test temperature, at this moment the tissue in the sheet perlite dissolving, fracture have taken place;
Holding stage: by continue certain soaking time in described test temperature, make dissolving just, fracture and form inhomogeneous and irregular granular perlite and further dissolve, form the core of tiny carbide;
Cooling stages: by suitable speed of cooling, make carbide separate out and be deposited on the tiny carbide core that final formation is similar to the globular carbide particle, reaches the pearlitic effect of nodularization.
2. organize the test technology of Medium pearlite according to the described intermediate phase annealing of claim 1 nodularization middle low carbon steel, it is characterized in that: when can't reach desired spheroidized carbide effect in the continuous refrigerative mode of cooling stages utilization the time, then at the Ar that is cooled to this kind steel grade
1Adding waits thermophase during temperature, carries out the insulation of certain hour, makes carbide fully separate out and is deposited on the tiny carbide core.
3. organize the test technology of Medium pearlite according to the described intermediate phase annealing of claim 1 nodularization middle low carbon steel, it is characterized in that determining of described Heating temperature:
When described sample is heated to described test temperature, sample is taken out quenching immediately, metallographic preparation is afterwards also carried out structure observation, the distribution of faults situation of mainly observing carbide particle on martensitic matrix; Through said process repeatedly, determine only Heating temperature T according to resulting best relatively tissue.
4. organize the test technology of Medium pearlite according to the described intermediate phase annealing of claim 3 nodularization middle low carbon steel, it is characterized in that determining of described soaking time:
After having determined best Heating temperature T, formulate several different soaking time under this temperature, when temperature is heated to T, be incubated this several times respectively, take out the metallographic preparation of sample quenching back, carry out structure observation, mainly observe the size and the distribution situation of carbide particle; The carbide size is tiny carbide core, and the distribution disperse is a better tissues; In above-mentioned several different soaking times, determine that according to the tissue of resultant the best only soaking time is H.
5. organize the test technology of Medium pearlite according to the described intermediate phase annealing of claim 4 nodularization middle low carbon steel, it is characterized in that determining of described speed of cooling:
According to determine best Heating temperature T and only soaking time H, formulating different speed of cooling cools off, and final to be organized as the distribution disperse even, and sizeable carbide particle be that the best is organized; In above-mentioned different speed of cooling, determine only speed of cooling C according to the tissue of resultant the best.
6. organize the test technology of Medium pearlite according to the described intermediate phase annealing of claim 5 nodularization middle low carbon steel, it is characterized in that determining of isothermal time:
When the speed of cooling of above-mentioned test does not reach described the requirement, then adopt the method for thermophase such as adding in process of cooling, make carbide fully separate out and be deposited on the tiny carbide core; Adopt several different isothermal times to test respectively; In above-mentioned several different isothermal times, determine only isothermal time H1 according to the tissue of resulting the best.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614394A (en) * | 2015-01-14 | 2015-05-13 | 福建乾达重型机械有限公司 | Detecting method for carburized layer in 17CrNiMo6 carburizing process |
| CN110079652A (en) * | 2018-01-25 | 2019-08-02 | 丰田自动车株式会社 | Method for manufacturing steel member |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1265427A (en) * | 1999-02-22 | 2000-09-06 | 奥瓦科钢铁股份公司 | Spheroidizing Annealing Method of Hypoeutectoid Low Alloy Steel |
| CN101845540A (en) * | 2009-03-26 | 2010-09-29 | 上海祝桥金属冲压延有限公司 | Ultra-high strength cold-rolled steel strip nodularization annealing process |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1265427A (en) * | 1999-02-22 | 2000-09-06 | 奥瓦科钢铁股份公司 | Spheroidizing Annealing Method of Hypoeutectoid Low Alloy Steel |
| CN101845540A (en) * | 2009-03-26 | 2010-09-29 | 上海祝桥金属冲压延有限公司 | Ultra-high strength cold-rolled steel strip nodularization annealing process |
Non-Patent Citations (1)
| Title |
|---|
| 《安徽工业大学学报》 20110131 金宝安等 "60Si2Mn弹簧钢碳化物快速球化工艺研究" 第16-18、22页 1-6 第28卷, 第1期 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614394A (en) * | 2015-01-14 | 2015-05-13 | 福建乾达重型机械有限公司 | Detecting method for carburized layer in 17CrNiMo6 carburizing process |
| CN110079652A (en) * | 2018-01-25 | 2019-08-02 | 丰田自动车株式会社 | Method for manufacturing steel member |
| CN110079652B (en) * | 2018-01-25 | 2020-09-18 | 丰田自动车株式会社 | Method for producing a steel component |
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