The invention relates to a metallographical corrodent and application of the metallographical corrodent in displaying carbide and grain boundaries in rolled steel and belongs to the technical field of chemical etching of metal materials. The metallographical corrodent is prepared from picric acid, a surfactant A, a surfactant B and the following raw materials, by volume, 3-5 parts of acetic anhydride, 60-75 parts of methyl alcohol and 20-40 parts of water, wherein 0.2-0.4 g of the picric acid is correspondingly adopted for each 1 ml of the methyl alcohol; the surfactant A is sodium dodecyl benzene sulfonate; the surfactant B is at least one of fatty alcohol-polyoxyethylene ether sodium sulfate, dodecyl alcohol amide and nonylphenol polyoxyethylene ether; and the mass ratio of the picric acid to the surfactant A to the surfactant B is (1-8): (3-6): (0.2-0.5). By means of the metallographical corrodent, rapid, clear and true displaying of the carbide and the grain boundaries in the rolled steel can be achieved.

Metallographical corrodent and application of metallographical corrodent in displaying carbide and grain boundaries in rolled steel

The invention relates to an SAE6150 spring steel wire rod austenite grain size detection method which includes the steps: (1) sample heat treatment; (2) sample preparation; (3) sample grinding; (4) corrosion reagent preparation; (5) etching; (6) grain size grading. The method solves the problems that when the SAE6150 spring steel wire rod austenite grain size is detected by an existing technical scheme, the grain size cannot be effectively graded as an austenite grain boundary cannot be clearly displayed. The SAE6150 austenite grain size is comprehensively and clearly displayed, and the SAE6150 spring steel wire rod austenite grain size is accurately evaluated.

SAE6150 spring steel wire rod austenite grain size detection method

The invention relates to a low-excitation structural material based on multi-factor coupling and a design method thereof and belongs to the technical field of metal materials. The structural materialhas the low-excitation performance, radiation resistance, high temperature resistance and corrosion resistance at the same time and meets the requirements, in a severe and complex service environment,of a fusion reactor or other fast neutron reactors. According to the design method, low-excitation elements and content control ranges of the low-excitation elements are screened out through a methodcombining nuclear design optimization and calculation conducted through a radiation safety evaluation software system, namely SuperMC; the obtained result is precise and reliable; and experiment costis lowered, and experimental time is shortened. By means of the method, materials of different constituents can be designed according to the different requirements of the specific service environmentfor performance of the low-excitation structural material; cost waste caused by the dish-frying type material design method is avoided; time and cost are saved; and the design method is free and flexible.

Low-excitation structural material based on multi-factor coupling and design method thereof

The invention discloses a normalizing method for achieving low-activation ferrite/martensite steel structure refinement. The normalizing method comprises the following steps of 1 first-stage heat treatment, specifically, low-activation ferrite/martensite steel (RAFM steel) is preheated to 250-260 DEG C and then heated to 900-950 DEG C at the speed of 50-60 DEG C/s, heat preservation is conducted for 1-2 s, and then air cooling is conducted till the temperature is lowered to 20-25 DEG C; and 2 second-stage heat treatment, specifically, the low-activation ferrite/martensite steel (RAFM steel) isheated to 900-1,100 DEG C at the temperature rising speed of 50-55 DEG C/s, heat preservation is conducted for 1-2 s, and then air cooling is conducted till the temperature is lowered to 20-25 DEG C.After the normalizing method is used, original austenite grains and carbides in a low-activation ferrite/martensite steel structure are refined, and especially large-particle M23C6 carbides are obviously decreased.

Normalizing method for achieving low-activation ferrite/martensite steel structure refinement

The invention discloses low-activation ferrite steel and a preparation method thereof. The low-activation ferrite steel comprises, by mass percent, 0.04-0.07% of C, 8.5-9.5% of Cr, 0.5-1.5% of W, 0.15-0.25% of V, 0.1-0.2% of Si, 0.3-0.6% of Mn, 0.16-0.28% of Ti and the balance Fe. The method comprises the steps that an alloy material comprising C, Cr, W, V, Si, Mn, Ti and Fe by mass percent is prepared; the alloy material is subjected to austenitizing; the austenitized alloy material is subjected to isothermal ferrite phase change; and after isothermal ferrite phase change is completed, cooling is conducted. The low-activation ferrite steel of the invention has god structure stability and high-temperature creep resistance and is expected to meet the design requirement for the next generation of fusion experimental reactor structural material serving at the high temperature and high irradiation strength, the preparation method of the low-activation ferrite steel is simple in technology,and the operability is high.

Interphase precipitation strengthened low-activation ferrite steel and preparation method thereof

The invention discloses a corrosive and application thereof in low-activation ferrite heat resistant steel treatment. The corrosive is composed of water, picric acid, sodium dodecyl sulfate and fatty alcohol ether sodium sulfate, the water serves as a solvent, the picric acid serves as an oxidizing agent, and the sodium dodecyl sulfate and the fatty alcohol ether sodium sulfate serve as surface active agents. When the corrosive is used, the prepared corrosive is heated till the temperature is 60-70 DEG C through a heat-collecting type constant-temperature heating magnetic force stirrer, and the polished low-activation ferrite heat resistant steel samples for nuclear power is placed into the corrosive and then taken out after heat preservation is conducted for 2-4 min. According to the corrosive, the prior austenite crystal boundary of the low-activation ferrite heat resistant steel samples for nuclear power can be clearly displayed, grain size rating can be conducted under 500 times, and the effect is good.

Corrosive and application thereof in low-activation ferrite heat resistant steel treatment

The invention discloses a delta-ferrite content control method of low-activity ferrite heat resistant steel for nuclear power A low-activity ferrite heat resistant steel sample for nuclear power is heated to reach a normalization temperature of 1000-1100 DEG C for insulation 200-800 s, and then, is cooled in air; and the delta-ferrite content in a matrix structure is controlled through reasonably controlling the normalization temperature and time of the low-activity ferrite heat resistant steel for nuclear power After treatment by the method, the delta-ferrite content in the low-activity ferrite heat resistant steel matrix structure for nuclear power is obviously reduced

Delta-ferrite content control method of low-activity ferrite heat resistant steel for nuclear power

The invention relates to a method for in-situ preparation of nano magnesium aluminum spinel reinforced iron-based alloy at low temperature. The method comprises the following steps: premixing MgO and Al2O3 with iron-based powder, carrying out mechanical alloying in a ball-milling tank in a high-purity argon environment, and carrying out ball-milling to obtain mixed powder; placing the powder in a mixed solution of CCl4 and CH2I2, stirring, taking supernviaould like liquid after the mixed powder settles and graphite floats up, cleaning and removing the graphite which is not dissolved in a matrix by using alcohol, then placing washed substances in a tube furnace, and drying the substances under high-purity argon flow; and carrying out hot pressed sintering on the powder obtained by drying treatment at the temperature of 900-1,100 DEG C and under the intensity of pressure of 100-200 MPa to obtain the nano MgAl2O4 reinforced iron-based alloy material. MgAl2O4 has the characteristics of high melting point at the temperature of 2,135 DEG C, low thermal expansion, high hardness, excellent anti-radiation properties and the like, and meets requirements of the iron-based high-temperature alloy to a reinforced phase.

Method for in-situ preparation of nano magnesium aluminum spinel reinforced iron-based alloy at low temperature

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Papers

Corrosive and application thereof in low-activation ferrite heat resistant steel treatment

Delta-ferrite content control method of low-activity ferrite heat resistant steel for nuclear power

Method for in-situ preparation of nano magnesium aluminum spinel reinforced iron-based alloy at low temperature