利用X射线计算机断层扫描技术对PREP金属粉末内部缺陷的研究

A Study on Internal Defects of PREP Metallic Powders by Using X-ray Computed Tomography.

作者信息

Nie Yan, Tang Junjie, Huang Junfei, Yu Shu, Li Yunping

机构信息

State Key Lab for Powder Metallurgy, Central South University, Changsha 410083, China.

Yuanmeng Precision Technology (Shenzhen) Institute, Shenzhen 518110, China.

出版信息

Materials (Basel). 2021 Mar 3;14(5):1177. doi: 10.3390/ma14051177.

DOI:10.3390/ma14051177

PMID:33802258

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7958947/

Abstract

In this study, the distribution, proportion and characteristics of internal defects in three kinds of powders of Ti-6Al-4V, 316-steel and Co-29Cr-6Mo alloys, produced by the plasma rotating electrode process (PREP) at various rotation speeds, are characterized by using both scanning electron microscopy (SEM) and synchrotron X-ray computed tomography (CT). The results show that in the powder of a given alloy, internal pores are formed more easily in coarse particles than in fine powder during PREP. The proportion of powder with pores can be reduced by appropriately increasing the rotation speed. In addition, the composition of an alloy has a great influence on the defect formation.

摘要

在本研究中，通过扫描电子显微镜（SEM）和同步加速器X射线计算机断层扫描（CT）对采用等离子旋转电极工艺（PREP）在不同转速下生产的Ti-6Al-4V、316钢和Co-29Cr-6Mo合金三种粉末内部缺陷的分布、比例和特征进行了表征。结果表明，在给定合金的粉末中，PREP过程中粗颗粒比细粉末更容易形成内部孔隙。适当提高转速可以降低有孔隙粉末的比例。此外，合金成分对缺陷形成有很大影响。