Method for characterizing super large crystal grains of titanium and titanium alloy ingots through anodization

Abstract

The invention provides a method for characterizing super large crystal grains of titanium and titanium alloy. The method comprises the following steps: subjecting titanium and titanium alloy samples to anodization and taking photos of the surfaces of the samples having undergone anodization coloring; as the samples having undergone anodization coloring have a plurality of colors, selecting at least two blocks from each color region as representative samples, and carrying out X-ray diffraction so as to obtain the crystal phase of the representative samples, wherein crystal phases in other regions with the same color as the representative samples are the same as the crystal phases of the corresponding representative samples; and if representative samples in a certain color region are low insurface diffraction spectral line intensity and diffraction cannot be formed, carrying out a supplementary pole diagram experiment to determine the monophase property and orientation of the representative samples in the color region, wherein crystal phases in other regions with the same color as the representative samples have the same monophase property and orientation as the monophase property and orientation of the corresponding representative samples. The method of invention is ingenious in design, can determine the orientation of crystal grains through X-ray diffraction experiment and pole diagram experiments while characterizing surface topography, and can be widely used for characterizing the as-cast structures of super large crystal grains of titanium ingots casted in an EB furnace.

Description

technical field [0001] The invention relates to a method for characterizing grain morphology and orientation, in particular to a method for characterizing super-large grains of as-cast structure of an EB furnace cast titanium ingot. Background technique [0002] Titanium has outstanding characteristics such as low density, high specific strength, low thermal conductivity, good high temperature and low temperature resistance, strong corrosion resistance, and biophilicity. At present, with the increasing use of aerospace, ships, submarines, missiles and other military and high-tech fields, the requirements for use are getting higher and higher, and the quality requirements for processing titanium and titanium alloy ingots are also rising. higher. The Electron Beam Cooling Hearth Furnace (EBCHR) is currently the main method for manufacturing titanium and titanium alloy ingots. Compared with the traditional vacuum consumable melting furnace (VAR), its advantage is that it can r...

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Problems solved by technology

[0003] At present, the most important method for macroscopic metallographic observation of titanium and titanium alloys cast in EB furnaces is to observe directly after corroding the surface with Kroll reagent. This method cannot clearly distinguish the grain boundaries of different grains in many cases, and it is completely impossible to determine the grain boundaries. Orientation of grains cannot provide enough data for short-process processing such as direct cold rolling, such as setting the rolling direction, rolling temperature and other parameters according to the orientation law of the grain group

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