122 results about "Misorientation" patented technology

The invention provides a SEM transmission electron Kikuchi diffraction apparatus and an analytical method. The apparatus comprises the following components: an electron beam irradiation unit for irradiating electron beams on a sample; an electron backscatter diffraction detector and a sample stage which are located below the electron beam irradiation unit; wherein the sample stage is configured, so that an inclination angle is formed between the sample which is carried on the sample stage and a horizontal plane; and the detector is provided with a phosphor screen which is configured for acquisition and reception of transmission electron signals which are emitted by the sample. Clear transmission electron Kikuchi diffraction patterns are obtained, in order to realize phase identification and phase proportion calculation of crystal grains of nanometer scale, analysis of nanometer scale texture and misorientation, analysis of crystal grain size and shape, analysis of crystal boundary as well as properties of sub-grain and twin crystal, etc.

The invention provides a method for preparation of a double-phase zirconium alloy EBSD sample by electrolytic polishing. The method adopts the steps of: firstly, utilizing wire-cutting equipment to cut a workpiece according to certain size from a double-phase zirconium alloy material along the directions of length, width and thickness; subjecting the cut workpiece to step-by-step polishing with abrasive paper to remove the oxide skin and polishing the workpiece bright; taking the double-phase zirconium alloy workpiece as the anode to connect a power supply positive electrode; taking a stainless steel sheet or other steel as the cathode to connect a power supply negative electrode, and preparing a sample by electrolytic polishing technology. The preparation method provided by the invention can achieve high diffraction pattern quality in EBSD (electron backscatter diffraction) testing so as to realize reliable characterization of alpha and beta zirconium alloy dual phase microstructure, grain size, microtexture, grain boundary characteristics, misorientation distribution and the like of the two phase of alpha and beta zirconium alloy. The electrolytic polishing liquid provided by the invention has the advantages of wide raw material sources, simple preparation, and low cost, etc. The electrolytic polishing method involved in the invention has the characteristics of simple operation and stable polishing effect, and the polished workpiece has high good flatness and high surface smoothness.

Provided are an abrasion resistant steel plate having excellent low-temperature toughness, and a manufacturing method therefor. The steel plate, which has a Brinell hardness (HBW10/3000) of 361 or more, and a plate thickness of 6-125 mm, contains 50/100 µm2 or more of fine precipitates having a diameter of 50 nm or less in lath-martensite steel that has crystal grains which are surrounded by high angle grain boundaries of a misorientation of 15° or more, and have an average particle size of 20 µm or less. The steel contains, by mass%, C: 0.10% to less than 0.20%, Si: 0.05-0.5%, Mn: 0.5-1.5%, Cr: 0.05-1.20%, Nb: 0.01-0.08%, B: 0.0005-0.003%, Al: 0.01-0.08%, N: 0.0005-0.008%, P: 0.05% or less, S: 0.005% or less, and O: 0.008% or less, moreover contains, as required, one or more rare earth elements from among Mo, V, Ti, Nd, Cu, Ni, W, Ca, and Mg, and satisfies 0.03 ≤ Nb+Ti+Al+V ≤ 0.14, with the remainder being constituted by Fe and unavoidable impurities. The steel is cast, and after rolling, is reheated to the Ac3 transformation point or higher, and successively quenched from the Ar3 transformation point or higher to a temperature of 250°C or less by water cooling. As required, the steel is reheated to 1100°C or more, the rolling reduction of a non-recrystallisation region is 30% or more, and the steel is cooled by water cooling to a temperature of 250°C or less, and reheated at a rate of 1°C/s or more to the Ac3 transformation point or higher.