《一种钛合金中等轴与片层α相复杂粘连组织分割的新方法(英文期刊)》.pdfVIP

Trans. Nonferrous Met. Soc. China 23(2013) 2265−2269 A new method for separating complex touching equiaxed and lamellar alpha phases in microstructure of titanium alloy Zhe JI, He YANG, Hong-wei LI, Xiao-guang FAN State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China Received 21 June 2012; accepted 15 October 2012 Abstract: A new method for separating complex touching equiaxed and lamellar alpha phases in the optical micrograph of titanium alloy was proposed for quantitative characterization. This new method involves three steps. First, concave points of the microstructural feature are identified with a threshold of the concaveness of the corner points which are extracted from the binarized image. Secondly, concave points pairs are selected from the concave points group established by means of marker circle or distance. Third, whether a candidate separation line which connects two concave points within a pair can be accepted or not is determined by the proposed four rules. The obtained results show that this method is effective on separating complex touching microstructural features. Key words: titanium alloy; microstructural feature; separation method features automatically. In the field of image processing, 1 Introduction the threshold of gray value was usually used as an effective parameter for separat