9 results about "Volume Percentage" patented technology

This cold-rolled steel sheet has a predetermined chemical composition, in which a metallographic structure at a ¼ depth position, which is a ¼ thickness position from a surface, contains, by volume percentage, retained austenite: more than 1.0% and less than 10.0%, tempered martensite: 80.0% or more, ferrite and bainite: 0% or more and 15.0% or less in total, and martensite: 0% or more and 3.0% or less, and an average grain size of a first grain counted in a sheet thickness direction from the surface when viewed at a cross section parallel to a rolling direction and parallel to the sheet thickness direction is 20.0 μm or less, and an average grain size of the first grain when the surface is viewed in a plan view is 30.0 μm or less.

The invention provides a method for predicting phase structure transformation of an impeller material, which comprises the following steps of: S1, roughly machining a target workpiece, and cutting a test ring on the target workpiece; s2, performing heat treatment on the target workpiece and the test ring; s3, cutting a first sample on the test ring, applying different loading forces to the first sample for stretching, performing X-ray diffraction detection on the first sample when the different loading forces are applied, and forming a corresponding peak curve; according to the method, the first sample is subjected to performance sample stretching and X-ray diffraction detection, the volume percentage of the phase structure of the target workpiece before and after stretching is tested, the austenite volume structure tissue transformation condition of the impeller in the overspeed process is predicted, and the phase structure of the impeller can be stabilized in advance; and phase structure transformation in the overspeed test process is prevented, and the performance stability and reliability of the target workpiece in actual application are greatly improved.

This invention discloses a method, apparatus, and electronic equipment for calculating the operating point of a slurry circulation pump. The method includes: acquiring the attribute information and operating data of the slurry circulation pump, the first relative density of limestone solids, and the second relative density of the limestone slurry to be transported; calculating the hydraulic performance of the slurry when the slurry circulation pump transports limestone slurry based on the attribute information, operating data, first relative density, and second relative density; acquiring the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry; calculating the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration; and calculating the operating point based on the hydraulic performance of the slurry and pipeline characteristics corresponding to the slurry circulation pump transporting different flow rates of clean water. This invention, through indirect calculation, effectively overcomes the limitation of existing technologies that cannot perform on-site measurements and are difficult to determine the true operating point, providing strong data support for subsequent energy-saving renovations.

A steel sheet has a predetermined chemical composition, when a sheet thickness is denoted by t, a metallographic structure at a t / 4-position, which is a position t / 4 away from a surface, in a cross section in a sheet thickness direction includes, by volume percentage, martensite: 70% or greater and residual austenite: 10% or greater, the maximum grain diameter of the residual austenite is less than 5.0 μm when a Mn concentration is measured at a plurality of measurement points at intervals of 1 μm in a square region with a side length of t / 4 centered at the t / 4-position in the cross section in the sheet thickness direction, a proportion of measurement points at which the Mn concentration is 1.1 times or greater than the average of the Mn concentrations at all of the plurality of measurement points is less than 10.0%, and the tensile strength is 1,470 MPa or greater.

This steel sheet has a specific chemical composition, the tensile strength is 1300 MPa or more, the ratio (R / t) of the limit bend radius to the sheet thickness is less than 3.5, when a depth position of 30 μm from the surface in the sheet thickness direction is defined as a position A and a depth position of ¼ of the sheet thickness from the surface in the sheet thickness direction is defined as a position B, the number density of AlN at the position A is 3000 pieces / mm2 or more and 6000 pieces / mm2 or less, a metallographic structure at the position B includes 90% or more of martensite by volume percentage, and the hardness at the position A is 1.20 times or higher than the hardness at the position B.

This hot-rolled steel sheet has a predetermined chemical composition, the microstructure includes, by volume percentage, 70% or more of martensite, tempered martensite, and bainite in total and 5% to 20% of residual austenite, in a surface layer region that is a range from a surface to a position at 1 / 10 of a sheet thickness, a sum of an average pole density of an orientation group consisting of {211}<111> to {111}<112> and a pole density of a crystal orientation of {110}<001> is 6.0 or less, a concentration of solid solution carbon in the residual austenite is 0.5 mass % or more, and a tensile strength is 980 MPa or more.

This hot-rolled steel sheet has a predetermined chemical composition, and in a case where the thickness is denoted by t, the metallographic structure at a t / 4 position from the surface contains one or both of tempered martensite and lower bainite at a volume percentage of 90% or more, the tensile strength is 980 MPa or more, and the average Ni concentration on the surface is 7.0% or more.

A concrete effective modulus and beam bridge inherent frequency calculation method considering water phase change relates to the field of engineering structure health monitoring, and comprises the following steps: S1, regarding concrete as a multiphase composite material comprising a homogeneous matrix material and various spherical inclusion particles (including air, water or ice); measuring the porosity, the water content and the ice content, and calculating the volume percentage of air, water and ice; s2, calculating the elastic modulus of the base material based on the porosity, and determining the elastic modulus of each inclusion material; s3, calculating the effective modulus of the concrete according to the volume percentages of the air, the water and the ice, the elastic modulus of the base material and the elastic modulus of each inclusion material; s4, calculating the inherent frequency of the bridge according to the effective modulus; s5, calculating the upper limit and the lower limit of the effective modulus; and S6, calculating the upper limit and the lower limit of the inherent frequency of the beam bridge. According to the method, the phase change of water in concrete pores is considered, the effective modulus of the concrete at different temperatures can be calculated, and the inherent frequency and the value limit of the beam bridge can be calculated.

The present application relates to a kind of high-strength, high impact toughness graphene reinforced copper-based composite material and its preparation method, the composite material is obtained by graphene and copper silver alloy composite, composite material contains the discontinuous desolvation organization of volume percentage content 38~86%, discontinuous desolvation organization is mainly composed of sub-micron scale Ag particle and Cu-rich matrix phase, part Ag particle is nanometer scale rod and densely distributed in discontinuous desolvation organization.In room temperature condition, the graphene reinforced copper-based composite material provided by the present application reaches 700~900MPa in tensile strength, elastic modulus is 125~138GPa, conductivity reaches 84~93%IACS, its linear expansion coefficient is 11.0×10 ‑6 ~12.5×10 ‑6 ℃ ‑1 At 20 DEG C, impact toughness is 80~110J·cm ‑2 , and the comprehensive performance is excellent.