CN102978359B - Variable-temperature circular treatment method of ultrafine C250 maraging steel grains - Google Patents
Variable-temperature circular treatment method of ultrafine C250 maraging steel grains Download PDFInfo
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- CN102978359B CN102978359B CN201210561345.5A CN201210561345A CN102978359B CN 102978359 B CN102978359 B CN 102978359B CN 201210561345 A CN201210561345 A CN 201210561345A CN 102978359 B CN102978359 B CN 102978359B
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Abstract
The invention discloses a variable-temperature circular treatment method of ultrafine C250 maraging steel grains, which comprises the following steps: heating C250 maraging steel to 700-780 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing primary circular treatment; and heating the material subjected to primary circular treatment to 900-960 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing secondary circular treatment. The variable-temperature circular treatment twice simultaneously implements refinement and homogenization of the C250 maraging steel grains. By utilizing the characteristic of phase-change cold hardening recrystallization in the reverse change process from martensitic structure to austenite by heating, the variable-temperature circular treatment twice effectively and sufficiently refines and homogenizes the austenite grains without plastic deformation. The invention can effectively enhance the toughness and fatigue life of the part.
Description
Technical field
The present invention relates to technical field of metal heat treatment, especially a kind of temperature varied cyclical treatment process of super-refinement C250 martensitic aging crystalline grain of steel.
Background technology
Along with China's machinery industry, the particularly fast development of Aeronautics and Astronautics cause, has had higher requirement to high-strength material.C250 maraging steel, due to the combination of strength and toughness of its excellence, receives the very big attention of various countries material supplier author, has vast potential for future development, it is further developed, development and application is imperative.Wherein grain refining intensificatiom is the Main Means improving martensitic aging hardness of steel, plasticity and toughness.The means of tradition crystal grain thinning mainly contain solution treatment crystal grain thinning and deformation process crystal grain thinning etc., and deformation process technique easily produces texture, makes its performance have directivity, affects the application of material on high-tech product; And simple solution treatment grain refinement effect is limited, be difficult to the requirement meeting Technology for Modern Equipment.Therefore, the effect of existing C250 maraging steel crystal grain thinning treatment process or not ideal enough.
Summary of the invention
The object of the invention is: the temperature varied cyclical treatment process that a kind of super-refinement C250 martensitic aging crystalline grain of steel is provided, it is by controlling heat treatment process parameter, reach the effect of better crystal grain thinning, the production of C250 maraging steel heat treated article can be widely used in, to overcome the deficiencies in the prior art.
The present invention is achieved in that the temperature varied cyclical treatment process of super-refinement C250 martensitic aging crystalline grain of steel, and C250 maraging steel is heated to 700 ~ 780 DEG C, and is incubated 1 ~ 10 minute, and then cold quenching is to room temperature, realizes first time circular treatment; To pass through the heating materials of first time circular treatment to 900 ~ 960 DEG C, and be incubated 1 ~ 10 minute, then cold quenching is to room temperature, realizes second time circular treatment; By above twice temperature varied cyclical process, achieve refinement and the homogenizing of C250 martensitic aging crystalline grain of steel simultaneously.
Owing to have employed technique scheme, compared with prior art, present invention utilizes martensitic stucture in heating to the feature undergoing phase transition cold working hardening recrystallize during austenite reverted austenite, by twice temperature varied cyclical process, when without the need to viscous deformation, effectively make the abundant refinement of austenite crystal and homogenizing.Autstenitic grain size after tradition deformation process is 3 ~ 4 grades, and the autstenitic grain size after temperature varied cyclical process of the present invention then can reach 8 ~ 9 grades.The advantage that part grain-size after the present invention not only has process is tiny, there will not be mixed crystal phenomenon, and the present invention also has and effectively can improve the obdurability of part and the advantage of fatigue lifetime.The inventive method is simple, and result of use is good.
Accompanying drawing explanation
Fig. 1 is the structure figure adopting the present invention to carry out the C250 maraging steel processed;
Fig. 2 is the structure figure of the C250 maraging steel adopting traditional deformation process.
Embodiment
Embodiments of the invention 1: the temperature varied cyclical treatment process of super-refinement C250 martensitic aging crystalline grain of steel, C250 maraging steel is heated to 750 DEG C, and is incubated 5 minutes, then cold quenching is to room temperature, realizes first time circular treatment; To pass through the heating materials of first time circular treatment to 930 DEG C, and be incubated 5 minutes, then cold quenching is to room temperature, realizes second time circular treatment; By above twice temperature varied cyclical process, achieve refinement and the homogenizing of C250 martensitic aging crystalline grain of steel simultaneously.
Embodiments of the invention 2: the temperature varied cyclical treatment process of super-refinement C250 martensitic aging crystalline grain of steel, C250 maraging steel is heated to 700 DEG C, and is incubated 10 minutes, then cold quenching is to room temperature, realizes first time circular treatment; To pass through the heating materials of first time circular treatment to 960 DEG C, and be incubated 1 minute, then cold quenching is to room temperature, realizes second time circular treatment; By above twice temperature varied cyclical process, achieve refinement and the homogenizing of C250 martensitic aging crystalline grain of steel simultaneously.
Embodiments of the invention 3: the temperature varied cyclical treatment process of super-refinement C250 martensitic aging crystalline grain of steel, C250 maraging steel is heated to 780 DEG C, and is incubated 1 minute, then cold quenching is to room temperature, realizes first time circular treatment; To pass through the heating materials of first time circular treatment to 900 DEG C, and be incubated 10 minutes, then cold quenching is to room temperature, realizes second time circular treatment; By above twice temperature varied cyclical process, achieve refinement and the homogenizing of C250 martensitic aging crystalline grain of steel simultaneously.
In order to verify experiment effect of the present invention further; the structure adopting the present invention to carry out the C250 maraging steel of C250 maraging steel and the traditional deformation process processed is compared; the present invention is adopted to carry out the structure of the C250 maraging steel processed as shown in Figure 1; the structure of the C250 maraging steel of tradition deformation process as shown in Figure 2; compare can learn according to Fig. 1 and Fig. 2; the crystal grain adopting the present invention to carry out the C250 maraging steel processed obtains significant refinement, and homogeneity is better.
Claims (1)
1. a temperature varied cyclical treatment process for super-refinement C250 martensitic aging crystalline grain of steel, it is characterized in that: C250 maraging steel is heated to 700 ~ 780 DEG C, and be incubated 1 ~ 10 minute, then cold quenching is to room temperature, realizes first time circular treatment; To pass through the heating materials of first time circular treatment to 900 ~ 960 DEG C, and be incubated 1 ~ 10 minute, then cold quenching is to room temperature, realizes second time circular treatment; By above twice temperature varied cyclical process, achieve refinement and the homogenizing of C250 martensitic aging crystalline grain of steel simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210561345.5A CN102978359B (en) | 2012-12-21 | 2012-12-21 | Variable-temperature circular treatment method of ultrafine C250 maraging steel grains |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201210561345.5A CN102978359B (en) | 2012-12-21 | 2012-12-21 | Variable-temperature circular treatment method of ultrafine C250 maraging steel grains |
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| Publication Number | Publication Date |
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| CN102978359A CN102978359A (en) | 2013-03-20 |
| CN102978359B true CN102978359B (en) | 2015-01-14 |
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| CN201210561345.5A Expired - Fee Related CN102978359B (en) | 2012-12-21 | 2012-12-21 | Variable-temperature circular treatment method of ultrafine C250 maraging steel grains |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104611526A (en) * | 2015-02-06 | 2015-05-13 | 桂林理工大学 | Heating method for refining 50# steel austenite crystal |
| CN105838862A (en) * | 2016-05-26 | 2016-08-10 | 中国科学院金属研究所 | Method for refining grains of maraging stainless steel by cyclic phase transformation |
| CN110358894A (en) * | 2019-08-22 | 2019-10-22 | 中钢集团郑州金属制品研究院有限公司 | A kind of spring steel wire crystal grain refinement heat treatment process |
| CN113151645B (en) * | 2021-04-14 | 2022-07-15 | 鞍钢集团北京研究院有限公司 | High-ductility maraging steel with excellent fatigue resistance and preparation method thereof |
| CN113755677A (en) * | 2021-08-30 | 2021-12-07 | 中国科学院金属研究所 | Ultra-high strength and high toughness maraging steel with superfine substructure and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3642595A (en) * | 1969-09-23 | 1972-02-15 | Us Air Force | Thermal grain refinement of maraging steel |
| SU578744A1 (en) * | 1975-04-14 | 1978-06-15 | Ордена Ленина Предприятие П/Я Р-6209 | Method of heat treatment of maraging steels |
| SU1022996A1 (en) * | 1980-04-17 | 1983-06-15 | Институт Механики Ан Усср | Method of heat treatment of maraging steel welded joints |
| CN101560592B (en) * | 2008-04-16 | 2010-12-22 | 中国科学院金属研究所 | Circulating phase-transition crystal grain thinning technology of micro-boron cobalt-free maraging steel |
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