CN113684428B - Heat treatment method for enhancing impact energy of ultrahigh-strength steel - Google Patents
Heat treatment method for enhancing impact energy of ultrahigh-strength steel Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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Abstract
A heat treatment method for improving the impact energy of in-situ nano-particle reinforced ultrahigh-strength steel belongs to the field of metal materials and comprises the following steps of 1, placing a hot-rolled steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 800-900 ℃ for 10-40 minutes, taking out the steel plate, and cooling to room temperature by water. 2. And (3) placing the steel plate in a heat treatment furnace for heat preservation, keeping the temperature for 1-3 hours at the furnace temperature of 350-600 ℃, and taking out the steel plate oil for cooling to room temperature. 3. And (3) placing the steel plate in a heat treatment furnace for heat preservation, wherein the furnace temperature is 200-300 ℃, preserving the heat for 1-3 hours, taking out the steel plate and air-cooling to room temperature. Aiming at the in-situ nano-particle reinforced ultrahigh-strength steel, the invention invents a new heat treatment method on the basis of not changing alloy components and a smelting process, and improves the impact energy of the in-situ nano-particle reinforced ultrahigh-strength steel compared with the traditional heat treatment method of quenching and tempering.
Description
The technical field is as follows:
the invention relates to a heat treatment method for improving the impact energy of in-situ nano-particle reinforced ultrahigh-strength steel for ocean engineering. In particular to a method for carrying out three-stage heat treatment on hot-rolled in-situ nanoparticle reinforced ultrahigh-strength steel so as to further improve the impact energy of the steel.
Background
In recent years, with the increasing development of marine resources at home and abroad, higher and higher requirements are being made on the strength, low-temperature impact performance and the like of steel for marine engineering. The traditional preparation idea of the steel for ocean engineering mainly adopts high-carbon high-alloy and quenching and tempering treatment, and the technical route can basically meet the requirements of the steel for ocean engineering, but has the problems of poor weldability and the like. Meanwhile, the front heat and the back heat during welding also increase the process and the cost.
In order to solve the problems, high-toughness easy-welding nano Cu-rich phase strengthened HSLA steel is developed in the United states. The alloy is greatly reduced in carbon and alloy, the Cu nanophase precipitated in the aging process is utilized to play a role in precipitation strengthening, the strength loss caused by the reduction of the carbon content is made up, and meanwhile, the ductility and toughness of the alloy are not greatly lost. However, the Cu nano-reinforced steel has the problems of poor thermal stability and the like, and research on the influence of aging temperature on the structure and performance of HSLA high-strength hull steel by a rowed soldier and the like [ rowed soldier, populif, suavigation, diesel front. the material heat treatment bulletin, 2011, 32(6) ] shows that with the increase of the aging temperature, the precipitation of Cu is obviously increased in an underaging state, the form of Cu is changed from a spherical shape to a short rod shape or a rod shape, the Cu and the matrix lose a coherent relationship, and the performance of a steel plate is deteriorated.
Wangyantong et al [ Wangyantong, Tanghao, Chengxian, New construction ] A method for preparing in-situ nanoparticle reinforced Q195 steel: china, 201310409451.6.2016-04-27.] preparing Q195 steel by in-situ nanoparticle strengthening, adding Fe-Ti alloy wires during smelting and casting, applying pressure in a container to form a pressure field, and applying centrifugal force or electromagnetic stirring in the melt to form a nano-strengthened steel alloy. Through detecting that a large amount of nano second phases which are dispersed and distributed are precipitated in situ in the structure, compared with the original Q195 steel, the strength of the nano reinforced steel plate is greatly improved, and the plasticity and toughness of the nano reinforced steel plate are not greatly lost. Chen Hua et al [ Xiaohua Chen, Lili Qiu, Hao Tang, Xiang Luo, Longfei Zuo, Zidong Wang. Effect of nanoparticles for formed in liquid crystal microstructure and mechanical property of high strength h steel, Journal of Materials Processing Technology,2015] studied in detail the difference in mechanical properties between A steel smelted in the conventional manner under the same composition and B steel fed with titanium wires to form in-situ nanophase during smelting, and found that the yield strength of B steel can reach 940MPa without much loss of ductility and toughness. The in-situ nanophase plays a role in refining crystal grains and refining impurities as heterogeneous nucleation cores in the solidification process, and the performance of the steel plate is greatly improved. Wang Zidong et al [ Wang Zidong, Shirongjian, Pangxinlu, Qiaolijie, Chengxianghua, Wang Lei ] a high strength and toughness steel and its preparation method: china, 201810891265.3.2018-12-14, invents a high strength and toughness steel and a preparation method thereof, wherein the high strength and toughness steel comprises the following chemical components in percentage by weight: c: 0.01-0.1 wt.%, Si ≤ 0.15 wt.%, Mn: 1.0-2.0 wt.%, P.ltoreq.0.02 wt.%, S.ltoreq.0.005 wt.%, Ni: 4.0-5.0 wt.%, Cr: 0.2-1.0 wt.%, Mo: 0.4-1.0 wt.%, V: 0.02-0.08 wt.%, Nb: 0.02-0.10 wt.%, Al: 0.02-0.1 wt.%, Ti: 0.005-0.05 wt.%, and the balance Fe. Feeding fine alloy twisted wires in a melt in a regional micro-supply mode to form in-situ nano particles, and improving the strength of the steel without damaging the ductility and toughness of the steel.
In addition to the development of new steel grades, the improvement of the heat treatment process also becomes a method for improving the toughness of the steel plate. China 201210491088.3.2012-11-27 discloses a heat treatment method for improving the toughness of a steel plate, wherein the toughness of the steel plate is improved after the steel plate is subjected to heat treatment through the steps of preheating, high-temperature quenching, heat preservation, furnace cooling and air cooling to room temperature. CN 103667614A (China, 201310653998.02013-12-09) discloses a heat treatment method for improving the toughness of a steel plate, wherein the steel plate is preheated, quenched at high temperature, and subjected to heat treatment by simultaneously placing quenching oil and the steel plate in air for cooling, carrying out heat preservation in multiple steps and carrying out furnace cooling, so that the toughness is improved. CN 107868865A (Sun Chao. Heat treatment method for improving toughness of steel plate) China, 201710996039.72017-10-23, invented a heat treatment method for improving toughness of steel plate, after forging the steel plate is heat treated by two steps of preheating-solution treatment-cooling, the toughness is improved.
Disclosure of Invention
The invention aims to provide a heat treatment method for improving the impact energy of in-situ nanoparticle reinforced ultrahigh-strength steel for ocean engineering.
The alloy chemical components (mass percent) of the in-situ nanoparticle reinforced ultrahigh-strength steel are as follows: c: 0.06-0.09%, Si: 0-0.1%, Mn: 0-0.15%, Ni: 9.0-11.0%, Cr: 1.5-2.0%, Mo: 0.8-1.0%, V: 0.03-0.04%, Ti: 0.006-0.010%, Al: 0.06-0.08%, Nb: 0.06-0.08%, Co: 7.0 to 8.0 percent.
A heat treatment method for improving the impact energy of in-situ nanoparticle reinforced ultrahigh-strength steel for ocean engineering is characterized in that raw materials are prepared into an in-situ nanoparticle reinforced ultrahigh-strength steel plate after smelting and rolling, and heat treatment is carried out on the steel plate according to a proper size, and the specific process comprises the following steps:
(1) placing the hot-rolled steel plate in a heat treatment furnace for heat preservation, wherein the furnace temperature is 800-900 ℃, the heat preservation time is 10-40 minutes, and taking out the steel plate to cool to room temperature;
(2) placing the steel plate in a heat treatment furnace for heat preservation, keeping the temperature for 1-3 hours at the furnace temperature of 350-600 ℃, and taking out the steel plate oil for cooling to room temperature;
(3) and (3) placing the steel plate in a heat treatment furnace for heat preservation, wherein the furnace temperature is 200-300 ℃, preserving the heat for 1-3 hours, taking out the steel plate and air-cooling to room temperature.
The first heat treatment process of the present invention is quenching. Compared with the heat treatment process of air cooling after tempering, the oil cooling improves the cooling speed, reduces the retention time of the steel in a high-temperature area, is beneficial to refining carbide and nitride particles on one hand, and can inhibit the temper brittleness to a certain extent on the other hand, thereby improving the impact energy of the steel. After quenching, the impact toughness of the steel does not decrease or increase monotonically with increasing tempering temperature, but two saddles may appear. This phenomenon of deterioration in toughness during tempering is called temper embrittlement. In 1948, McLean proposed a balanced segregation theory, which indicates that segregation of elements such as antimony and phosphorus weakens grain boundaries, and the fracture strength of the grain boundaries is reduced. The segregation of impurity atoms in the grain boundaries is due to the ability to reduce distortion energy (compared to the distribution of impurity atoms within the grains), i.e., the segregation of impurities in the grain boundaries is a spontaneous process of transition to an equilibrium state. Therefore, the cooling rate after tempering has a great influence on brittleness. The rapid cooling after the high-temperature tempering can inhibit the temper brittleness to a certain extent, thereby improving the impact energy of the steel. The third step of the process is low-temperature tempering, and the residual stress of the material is eliminated.
The invention has the advantages that:
aiming at the in-situ nano-particle reinforced ultrahigh-strength steel, the novel heat treatment method is invented on the basis of not changing alloy components and a smelting process, and compared with the traditional heat treatment process of quenching and tempering, the impact energy of the steel plate is improved.
The specific implementation mode is as follows:
the invention is described in detail below by means of exemplary embodiments. It is pointed out that the person skilled in the art will readily understand that the following examples are given by way of illustration only and are not intended to limit the invention in any way.
Example 1:
(1) the alloy comprises the following chemical components in percentage by mass: c: 0.09%, Si: 0.1%, Mn: 0.15%, Ni: 10.8%, Cr: 1.7%, Mo: 0.9%, V: 0.04%, Ti: 0.010%, Al: 0.06%, Nb: 0.07%, Co: 7.0 percent;
(2) smelting and rolling the raw materials to prepare an in-situ nanoparticle reinforced ultrahigh-strength steel plate with the thickness of 11mm, and respectively carrying out heat treatment on the steel plates A, B with the same size;
(3) the heat treatment process of the steel plate A comprises the following steps: placing the steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 840 ℃ for 30 minutes, taking out the steel plate, and cooling the steel plate to room temperature; placing the steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 550 ℃ for 2 hours, taking out the steel plate and air-cooling to room temperature;
(4) the heat treatment process of the steel plate B comprises the following steps: placing the steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 840 ℃ for 30 minutes, taking out the steel plate, and cooling the steel plate to room temperature; placing the steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 550 ℃ for 2 hours, taking out the steel plate, and cooling the steel plate to room temperature; and (3) placing the steel plate in a heat treatment furnace for heat preservation, keeping the furnace temperature at 250 ℃ for 2 hours, taking out the steel plate, and air-cooling to room temperature.
(5) The room temperature tensile test and the-20 ℃ impact test are respectively carried out on the steel plate A, B after the heat treatment, the results show that the strength difference between the steel plate and the steel plate is several to more than ten MPa, the-20 ℃ impact power of the steel plate B is improved by 17J compared with that of the steel plate A, and the results are shown in Table 1:
TABLE 1
Claims (1)
1. The heat treatment method for the impact energy of the in-situ nanoparticle reinforced ultrahigh-strength steel is characterized in that the steel is the in-situ nanoparticle reinforced ultrahigh-strength steel, and the alloy comprises the following chemical components in percentage by mass: c: 0.06-0.09%, Si: 0-0.1%, Mn: 0-0.15%, Ni: 9.0-11.0%, Cr: 1.5-2.0%, Mo: 0.8-1.0%, V: 0.03-0.04%, Ti: 0.006-0.010%, Al: 0.06-0.08%, Nb: 0.06-0.08%, Co: 7.0-8.0%, and specifically comprises the following steps:
(1) placing the hot-rolled steel plate in a heat treatment furnace for heat preservation, wherein the furnace temperature is 800-900 ℃, the heat preservation time is 10-40 minutes, and taking out the steel plate to cool to room temperature;
(2) placing the steel plate in a heat treatment furnace for heat preservation, keeping the temperature for 1-3 hours at the furnace temperature of 350-600 ℃, and taking out the steel plate oil for cooling to room temperature;
(3) and (3) placing the steel plate in a heat treatment furnace for heat preservation, wherein the furnace temperature is 200-300 ℃, preserving the heat for 1-3 hours, taking out the steel plate and air-cooling to room temperature.
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