CN102021300A - Grain refinement heat treatment process of large impeller material forging - Google Patents
Grain refinement heat treatment process of large impeller material forging Download PDFInfo
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- CN102021300A CN102021300A CN2010105755207A CN201010575520A CN102021300A CN 102021300 A CN102021300 A CN 102021300A CN 2010105755207 A CN2010105755207 A CN 2010105755207A CN 201010575520 A CN201010575520 A CN 201010575520A CN 102021300 A CN102021300 A CN 102021300A
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Abstract
The invention discloses a grain refinement heat treatment process of a large impeller material forging, wherein after high-temperature complete austenitizing, cores are repeatedly strengthened, nuclei are formed again by multiple austenitizing, and grains are finally refined under the condition of meeting requirements for mechanical performance. The invention has the advantages that furnace cooling and austenite decomposition are sufficient after high-temperature complete austenitizing; 790 DEG C nucleation is increased by repeatedly strengthening the cores and forming the nuclei again through multiple austenitizing; the steps of transformation and nucleation in two phase zones and core strengthening are carried out; and based on the arrangement and preparation above, the new grain boundary formed as cooled air is quickly heated to 850 DEG C is obviously refined, and the grains are finally refined under the condition of meeting requirements for the mechanical performance.
Description
Technical field
The present invention relates to a kind of thermal treatment process, specifically a kind of grain refining thermal treatment process of large-scale impeller material forging belongs to field of machining.
Background technology
Metal heat treatmet is metal works to be placed on be heated to suitable temperature in certain medium, and keep certain hour in this temperature after, again with the friction-motion speed cooling, controls a kind of technology of its performance by changing metal material surface or inner weave construction.
Metal heat treatmet is one of important process in the machinofacture, compare with other complete processings, thermal treatment does not generally change the shape and the whole chemical ingredients of workpiece, but by changing the microstructure of workpiece inside, or the chemical ingredients of change workpiece surface, give or improve the use properties of workpiece, be characterized in improving the inner quality of workpiece, and this generally not to be naked eyes can see.
The steel ingot of forging heavy forging is big, and the crystallisation process cooling is slow, and thick as-cast structure and segregation are serious; Be out of shape little and skewness; The thick characteristics such as inhomogeneous of austenite crystal make heavy froging crystal grain be more difficult to get refinement.
Large-scale impeller forging, the material of its use have the serious genetic predisposition of organizing, and this forging is because shape is special, often last fiery deflection is less, terminal temperature is undesirable, and it is thick and very inhomogeneous to forge the inner crystal grain in back, solves by the thermal treatment of routine is very difficult.Though mechanical property reaches requirement; but often forging organizes unfavorable factors such as genetic predisposition is serious, last fiery deflection is less, terminal temperature is undesirable; can't solve by existing technology; existing technology can not increase particle, reinforcing core; its single austenitizing; can't resolve the thick inhomogeneous of crystal grain, usually also can follow the anisotropy that presents tissue.
Summary of the invention
In order to address the above problem, the present invention has designed a kind of grain refining thermal treatment process at large-scale impeller material forging, by after the high temperature complete austenitizing, and reinforcing core, austenitizing forming core again repeatedly repeatedly, satisfying under the prerequisite of mechanical property, finally making crystal grain obtain refinement.
Technical scheme of the present invention is: the grain refining thermal treatment process of large-scale impeller material forging may further comprise the steps:
(1) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 980 ± 10 ℃ by≤80 ℃/hour speed, samming, the insulation 8 hours after stove be chilled to＜300;
(2) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 790 ± 10 ℃, samming, insulation water-cooled after 12 hours by≤60 ℃/hour speed;
(3) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming, the insulation 14 hours after stove cold;
(4) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 850 ± 10 ℃, samming, insulation oil cooling after 8 hours by≤80 ℃/hour speed;
(5) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming, the insulation 8 hours after stove cold.
The invention has the advantages that: after passing through the high temperature complete austenitizing, stove is cold fully, and austenite decomposes fully; Reinforcing core, austenitizing forming core have again repeatedly increased by 790 ℃ of forming cores repeatedly; And in the transformation of two-phase region upper edge, forming core, the step of reinforcing core; Prepare based on above tissue, the new crystal boundary that rises to 850 ℃ of formation behind the air cooling is rapidly finally satisfying obvious refinement under the prerequisite of mechanical property, makes crystal grain obtain refinement.
Description of drawings
Fig. 1 is the process flow steps 1 of the embodiment of the invention and 2 synoptic diagram;
Fig. 2 is process flow steps 3 synoptic diagram of the embodiment of the invention;
Fig. 3 is the process flow steps 4 of the embodiment of the invention and 5 synoptic diagram.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
Use the equipment situation as follows in this technological process:
(1) forging heat tracing: 800KW bench vehicle type electrical resistance furnace;
(2) forging lifting: main driving of colluding carrying 32T;
(3) forging cooling: volume is 132 tons a synthetic quenching liquid bath.
As shown in Figure 1-Figure 3, the impeller material thermal treatment process may further comprise the steps:
(1) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 980 ± 10 ℃ by≤80 ℃/hour speed, samming, the insulation 8 hours after stove be chilled to＜300 ℃;
(2) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 790 ± 10 ℃, samming, insulation water-cooled after 12 hours by≤60 ℃/hour speed;
(3) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming, the insulation 14 hours after stove cold;
(4) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 850 ± 10 ℃, samming, insulation oil cooling after 8 hours by≤80 ℃/hour speed;
(5) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming, the insulation 8 hours after stove cold.
A collection of 30Cr2Ni4MoV, 34CrNi3Mo impeller have been carried out long refinement, modified thermal treatment of cycle, after passing through the high temperature complete austenitizing, reinforcing core, austenitizing forming core are again repeatedly satisfying under the prerequisite of mechanical property repeatedly, finally make crystal grain obtain refinement, observe metallographic, from original thick, inhomogeneous state, be improved to about present grain fineness number level Four, crystal boundary is obvious than before, crystal grain is evenly distributed, and proves that this technology is effective.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. the grain refining thermal treatment process of large-scale impeller material forging is characterized in that may further comprise the steps:
(1) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 980 ± 10 ℃ by≤80 ℃/hour speed, samming, the insulation 8 hours after stove be chilled to＜300 ℃;
(2) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 790 ± 10 ℃, samming, insulation water-cooled after 12 hours by≤60 ℃/hour speed;
(3) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming+insulation after 14 hours stove cold;
(4) be warming up to 650 ℃ by power, be incubated after 3 hours, be warming up to 850 ± 10 ℃, samming, insulation oil cooling after 8 hours by≤80 ℃/hour speed;
(5) be warming up to 350 ℃ by power, be incubated after 3 hours, be warming up to 670 ± 10 ℃ by≤60 ℃/hour speed, samming, the insulation 8 hours after stove cold.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105755207A CN102021300A (en) | 2010-12-07 | 2010-12-07 | Grain refinement heat treatment process of large impeller material forging |
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| CN2010105755207A CN102021300A (en) | 2010-12-07 | 2010-12-07 | Grain refinement heat treatment process of large impeller material forging |
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| CN102021300A true CN102021300A (en) | 2011-04-20 |
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| CN2010105755207A Pending CN102021300A (en) | 2010-12-07 | 2010-12-07 | Grain refinement heat treatment process of large impeller material forging |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644647A (en) * | 2012-04-23 | 2012-08-22 | 徐尚仁 | Martensite stainless steel anti-theft screw manufactured by quenching hardness-increasing and brittle non-increasing process |
| CN102649993A (en) * | 2012-04-25 | 2012-08-29 | 中国科学院金属研究所 | Method for thinning crystalline grain of large low alloy cast |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128532A (en) * | 1979-03-26 | 1980-10-04 | Kawasaki Steel Corp | Heat treatment for austenite uniform grain refining in low-carbon ni-cr-mo steel |
| WO2001029272A1 (en) * | 1999-10-19 | 2001-04-26 | Aspector Oy | Method of producing ultra-fine grain structure for unalloyed or low-alloyed steel |
| CN1587422A (en) * | 2004-07-14 | 2005-03-02 | 钢铁研究总院 | High strength austenite steel crystal fining method and miter angle extruding deforming mould |
| CN1940094A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Method for refining normal carbon-structural crystal grain |
| CN101165195A (en) * | 2006-10-19 | 2008-04-23 | 中国科学院金属研究所 | Method for thinning steel microscopic structure of crank axle for vessel |
-
2010
- 2010-12-07 CN CN2010105755207A patent/CN102021300A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55128532A (en) * | 1979-03-26 | 1980-10-04 | Kawasaki Steel Corp | Heat treatment for austenite uniform grain refining in low-carbon ni-cr-mo steel |
| WO2001029272A1 (en) * | 1999-10-19 | 2001-04-26 | Aspector Oy | Method of producing ultra-fine grain structure for unalloyed or low-alloyed steel |
| CN1587422A (en) * | 2004-07-14 | 2005-03-02 | 钢铁研究总院 | High strength austenite steel crystal fining method and miter angle extruding deforming mould |
| CN1940094A (en) * | 2005-09-29 | 2007-04-04 | 宝山钢铁股份有限公司 | Method for refining normal carbon-structural crystal grain |
| CN101165195A (en) * | 2006-10-19 | 2008-04-23 | 中国科学院金属研究所 | Method for thinning steel microscopic structure of crank axle for vessel |
Non-Patent Citations (2)
| Title |
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| 张明等: "45#钢拖轮轴调质工艺的优化", 《大型铸锻件》 * |
| 黄斌等: "40Cr钢晶粒超细化工艺研究", 《热处理》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644647A (en) * | 2012-04-23 | 2012-08-22 | 徐尚仁 | Martensite stainless steel anti-theft screw manufactured by quenching hardness-increasing and brittle non-increasing process |
| CN102649993A (en) * | 2012-04-25 | 2012-08-29 | 中国科学院金属研究所 | Method for thinning crystalline grain of large low alloy cast |
| CN102649993B (en) * | 2012-04-25 | 2014-04-23 | 中国科学院金属研究所 | Method for thinning crystalline grain of large low alloy cast |
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Application publication date: 20110420 |