Nondestructive evaluation method for internal pores of additive manufacturing titanium alloy test bar

The invention relates to a nondestructive evaluation method for internal pores of an additive manufacturing titanium alloy test bar, which comprises the following steps of: performing filtering and noise reduction processing on a reconstructed image through Avizo image processing software, performing interactive threshold segmentation to obtain a test bar contour image, and obtaining a closed internal pore sample grayscale image; carrying out difference operation on the gray level image and the test bar contour image to obtain a gray level image only containing holes; a gray threshold greater than a gray standard deviation of a sample material in an image is set, and gray difference operation is performed on a gray image only containing holes to remove noise, so that a binary image is obtained. According to the method for detecting the internal porosity of the additive manufacturing titanium alloy test bar by using the micro-focus industrial CT, the defect that the internal tiny defects of the additive manufa