33results about How to "Simple heat treatment method" patented technology

The invention discloses a heat treatment method for inhibiting recrystallization of a 3D printed or welded single crystal superalloy, and belongs to the field of additive manufacturing and metal heattreatment. The method comprises the following steps of removing residual alloy powder and an impurity crystal layer on the surface of the 3D printed or welded single crystal superalloy, performing stress relief annealing on the 3D printed or welded single crystal superalloy to release internal residual stress on the premise of no recrystallization, performing standard heat treatment on the 3D printed or welded single crystal superalloy subjected to stress relief annealing after heat preservation for a necessary period of time at a necessary temperature, so that the strengthening gamma' phase of the 3D printed or welded single crystal superalloy grows to a predetermined size and is orderly arranged. The method can be use for improving the structure and performance of the 3D printed or welded single crystal superalloy, and subsequent heat treatment of the 3D printed or welded single crystal superalloy can be developed based on the method.

The invention discloses a post-weld heat treatment method for Q345R steel plates for hot roll pressure container barrels. The post-weld heat treatment method comprises the processes of steel plate heating, heat preservation and cooling. According to the post-weld heat treatment method, the post-weld heat treatment heating speed, the heat preservation time, the cooling speed and other processes arecontrolled, the good mechanical property of the steel plates is guaranteed, the interior microstructure coarsening and unevenness caused by hot roll of the Q345R (HIC) steel plates for the hot roll pressure container barrels are avoided, the internal defects are eliminated, and the mechanical property and the decay resistance of the steel plates and the welding heat effect zones are guaranteed. The treated steel plates are well matched with the 1 / 2 position of welding seams in the plate thickness direction in obdurability, the surface hardness is low, the mechanical property of the steel plates is stable, sulfuretted hydrogen corrosion resistance is good, and the post-weld heat treatment method is suitable for post-weld heat treatment production and checking of same-like steel plates withthe thicknesses ranging from 110 mm to 160 mm. The heat treatment method is simple and practical, and is suitable for volume production in plants.

The invention discloses a thermal treatment method for improving mechanical property of a titanium alloy strip, which comprises the following steps of: 1, a first stage of thermal treatment: performing the first stage of thermal treatment on the treated titanium alloy strip by adopting a vacuum thermal treatment furnace, wherein the heating temperature is 780 to 820 DEG C, the heat preservation time is 10 to 20 minutes and the cooling mode is vacuum gas quenching; and a second stage of thermal treatment: performing the second stage of thermal treatment on the treated titanium alloy strip after the first stage of thermal treatment by adopting the vacuum thermal treatment furnace, wherein the heating temperature is 460 to 540 DEG C, the heat preservation time is 6 to 10 hours and the cooling mode is vacuum furnace cooling. The method has the advantages of reasonable design, simple thermal treatment, simple and convenient operation and good thermal treatment effect; the mechanical property of the treated titanium alloy strip is greatly improved; and the method fully meets the technical requirements of the TB2 titanium alloy strip for aviation and spaceflight for high strength, high toughness, high modulus and the like.

The invention discloses a heat treatment method of a non-ferrous metal hot roll, and relates to the technical field of metal processing. The method comprises the following steps: 1) preheating: the roll is placed in a high-temperature furnace for preheating treatment after being demolded and cleaned; 2) secondary normalization; 3) quenching: double-frequency induction quenching is performed on the working surface of the roll, and the cooling mode is a combination of oil cooling and air cooling; 4) tempering; 5) annealing. The heat treatment method of the non-ferrous metal hot roll is simple and feasible; the treated non-ferrous metal hot roll is high in strength and good in thermal cracking resistance and electrochemical corrosion resistance, and has excellent accident resistance, fatigue resistance and abrasion resistance, thereby meeting operating requirements of practical production and application; the service life of the non-ferrous metal hot roll is effectively prolonged, and production efficiency and economic benefits are increased.

The invention relates to a method for acquiring a tri-modal microstructure in a near-alpha titanium alloy. Near-beta temperature heat treatment is carried out to change the sample microstructure into alpha-equiaxial+martensite; two-phase region temperature heat treatment is carried out to change the sample microstructure into alpha-equiaxial+alpha sliver+beta-rotation; and aging treatment is carried out to obtain the titanium alloy with tri-modal microstructure. The invention does not need near-beta thermal deformation, does not generate deformation temperature rise effect, can easily control the temperature, and does not need to carry out special pretreatment on the equiaxial-structure near-alpha titanium alloy to acquire the duplex microstructure. The invention is simple and easy to implement, has wide application range, and is suitable for heat treatment on near-alpha titanium alloy parts manufactured by rolling, extrusion, machining and other formation methods to acquire the tri-modal microstructure. Especially for the titanium alloy complex components, partial complex components or large-size components, after processing the near net shape of the component, the method can be utilized to acquire the tri-modal microstructure.

The invention discloses a method for obtaining a tri-state tissue from a titanium alloy, and is characterized in that through thermal treatment at near beta temperature, a test sample tissue is changed to an alpha isometric+martensite; through temperature solution in a two-phase region, the test sample tissue is changed to an alpha isometric+alpha silver+martensite; and the titanium alloy with the tri-state tissue is obtained through annealing. According to the invention, near beta thermal deformation is not required, a deformation temperature rise effect cannot be generated, the temperature is easy to control, and an initial isometric tissue of the titanium alloy can become a duplex tissue without special pretreatment. The method, provided by the invention, is simple and easy, and wide in application range, and can be applied to thermal treatment of titanium alloy parts, which are produced by methods, such as rolling, extrusion, machining and the like, so that the tri-state tissue is obtained. In particular for complicated titanium components, locally complicated components or large components, after a near clean form of the components is obtained through machining, the tri-state tissue is obtained through the method provided by the invention.

The invention discloses a heat treatment method for inhibiting recrystallization of a 3D printed or welded single crystal superalloy, and belongs to the field of additive manufacturing and metal heattreatment. The method comprises the following steps of removing residual alloy powder and an impurity crystal layer on the surface of the 3D printed or welded single crystal superalloy, performing stress relief annealing on the 3D printed or welded single crystal superalloy to release internal residual stress on the premise of no recrystallization, performing standard heat treatment on the 3D printed or welded single crystal superalloy subjected to stress relief annealing after heat preservation for a necessary period of time at a necessary temperature, so that the strengthening gamma' phase of the 3D printed or welded single crystal superalloy grows to a predetermined size and is orderly arranged. The method can be use for improving the structure and performance of the 3D printed or welded single crystal superalloy, and subsequent heat treatment of the 3D printed or welded single crystal superalloy can be developed based on the method.

The invention relates to the technical field of heat treatment of castings and forgings, in particular to 35CrMnSi steel, and a heat treatment method for eliminating second-class temper brittleness and improving toughness of the 35CrMnSi steel, which is suitable for quenching and tempering. The heat treatment method comprises a series of steps of quenching, tempering, heating, preserving heat and cooling, and integrates physical and chemical treatment technologies and the like, so that insufficient and incomplete basic structural transformation of the 35CrMnSi steel is avoided, the second-class temper brittleness is eliminated, and the toughness of a product is improved; the heat treatment method has the advantages as follows: by the heat treatment method, the quality of the product can be improved, the defective rate can be reduced, production resources can be saved, the production cost of an enterprise can be reduced, the second-class temper brittleness of the 35CrMnSi steel can be eliminated and the toughness of the 35CrMnSi steel can be improved.

The invention relates to a heat treatment method for additive manufacturing monocrystal nickel-base superalloy. The heat treatment method includes the steps that to-be-processed additive manufacturingmonocrystal nickel-base superalloy is subjected to solid solution heat treatment, aging heat treatment and cooling in a heat treatment furnace, slicing and sample preparation are carried out on the processed additive manufacturing monocrystal nickel-base superalloy, combined with microstructure characterization and crystal orientation analysis, and the effect of the heat treatment method is judged according to the size of gamma<'> phase and whether recrystallization occurs in a heat-affected zone and a epitaxial growth zone or not. According to the heat treatment method for the additive manufacturing monocrystal nickel-base superalloy, the gamma<'> phase is dissolved, re-precipitated, and grown up in the subsequent aging process by applying appropriate heat energy to the additive manufacturing monocrystal nickel-base superalloy, thus the gamma<'> phase with uniform size distribution and regular shape is obtained, and the purposes of microstructure improvement and alloy property optimization are achieved.

The invention discloses an sp2 hybrid carbon material doped with single dispersed metal atom and a preparation method of the sp2 hybrid carbon material, and relates to an sp2 hybrid carbon material and the preparation method thereof. The invention aims to solve the problems of high preparation cost of metal doped carbon material and uncontrollable metal introduction site. According to the sp2 hybrid carbon material doped with the single dispersed metal atom, a part of metal element is bonded with N atom evenly through a coordinate bond and doped in a sp2 hybrid carbon framework, and the other part is evenly distributed in the sp2 hybrid carbon material doped by the single dispersed metal atom. The preparation method includes steps of firstly, mixing and acquiring a nitrogen source / carbon source fluid mixture; secondly, freeze-drying and acquiring a nitrogen source / carbon source solid mixture; thirdly, sintering to obtain the sp2 hybrid carbon material doped with the single dispersed metal atom. The invention is mainly used for preparing the sp2 hybrid carbon material doped with the single dispersed metal atom.

The invention provides a method of acquiring a tri-modal microstructure in a near-alpha titanium alloy through furnace cooling. According to the method, near-beta temperature heat-insulating water cooling and two-phase region temperature heat-insulating furnace cooling and air cooling are carried out so as to obtain the near-alpha titanium alloy with the tri-modal microstructure; 10 to 20% of an equiaxial primary alpha phase can be retained in a titanium alloy microstructure through the near-beta temperature heat-insulating water cooling, with the balance being martensite; and a tri-modal microstructure titanium alloy consisting of equiaxial alpha, sliver alpha and a beta transformation microstructure is finally formed through the two-phase region temperature heat-insulating furnace cooling and air cooling. The method provided in the invention needs no near-beta thermal deformation and does not generate non-uniform deformation heat effects, temperature can be easily controlled, and special pretreatment does not need to be carried out on the equiaxed-structure near-alpha titanium alloy so as to acquire a duplex microstructure. The thickness value of secondary flake alpha in the invention is in a great adjustable range; the method is simple and easy to implement, has a wide application scope and is applicable to heat treatment of near-alpha titanium alloy parts manufactured by using methods like rolling, extrusion and machining molding.

The invention discloses a method for obtaining a tri-modal microstructure in dual-phase titanium alloy through furnace cooling. The method comprises the following steps of: carrying out heat insulation water cooling at near beta temperature; carrying out heat insulation furnace cooling in a common two-phase region and carrying out heat insulation air cooling in a two-phase region at lower temperature. 10-20% of primary equiaxial alpha phases are remained in a titanium alloy microstructure through carrying out heat insulation water cooling at near beta temperature, and the rests are martensites. A test sample microstructure is changed into alpha equal axle, alpha thick silvers and beta residues through carrying out heat insulation furnace cooling in the common two-phase region. The titanium alloy with the tri-modal microstructure is obtained through carrying out heat insulation air cooling in the two-phase region at lower temperature. The method is free of near beta thermal deformation, deformation and nonuniform thermal effect and easy for temperature control, and a dual-modal microstructure can be obtained without carrying out special pretreatment on a primary equiaxial microstructure of the titanium alloy. The method is simple, convenient, feasible and wide in application rang and can be widely used for thermal treatment of titanium alloy parts manufactured by using methods such as rolling, squeezing, machining, forming and the like so as to obtain the tri-modal microstructure.

The invention relates to a metal super-hydrophobic surface and a preparation method thereof. The preparation method comprises following two steps: firstly, electroplating method is adopted, traditional Watts electroplate liquid is taken as a base electroplate liquid, conductive metal base materials such as stainless steel, copper, aluminium alloy, and magnesium aluminum alloy, are taken as a negative electrode, and copper sheets are taken as a positive electrode so as to prepare a nickel coating layer; and secondly, an obtained electroplated surface and an ethanol solution containing fluorosilane are delivered into a heating furnace for heat treatment, and an obtained sample is subjected to washing and blow drying so as to obtain the surface with super-hydrophobicity on metal workpieces. The preparation method of the metal super-hydrophobic surface is simple; cost is low; and the preparation method is convenient for industrialized application. Contact angle of the obtained metal super-hydrophobic surface is more than 155 DEG, and rolling angel is less than 10 DEG; the metal super-hydrophobic surface possesses excellent super hydrophobicity, self-cleaning performance, wear resistance, and corrosion resistance; the preparation method is suitable for obtaining the metal super-hydrophobic surfaces with super hydrophobicity, self-cleaning performance, wear resistance, and corrosion resistance on the surfaces of a plurality of metal base materials with complex shapes and large area.