Regular Article

Evaluation of maximum non-metallic inclusion sizes in steel by statistics of extreme values method based on Micro-CT imaging

¹ Engineering Research Center of Failure Analysis and Safety Assessment, Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, PR China
² Division of Nuclear Technology and Applications, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, PR China
³ Lille University, Civil Engineering and geo-Environmental Laboratory (ULR 4515 LGCgE), Lille 59000, France
⁴ School of Mechanical & Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, PR China
⁵ Shandong Institute of Mechanical Design and Research, 129 Jiluo Road, Jinan 250031, China

^* e-mail: liulong@ihep.ac.cn
^** e-mail: zm870623@foxmail.com

Received: 20 August 2021
Accepted: 8 February 2022

Abstract

Non-metallic inclusions have become a matter of concern for several properties of steel. The effective evaluation of inclusions in steel would provide critical information to evaluate the steel quality. In this study, an evaluation method based on X-ray Micro-Computed Tomography (Micro-CT) experiments was proposed. First, Micro-CT experiments were carried out to characterize the inclusions. Then, the characterizations of the inclusions were collected based on the 2D slices and their 3D features. The extreme values were evaluated by statistics of extreme values method with these data. The evaluation results were compared with those obtained by international standard ASTM E2283-08. The results demonstrated that the evaluation method based on inclusion sizes collected from 3D inclusion information provided a stable result. It means that the extreme value evaluation method with the 3D data based on Micro-CT was an effective method.