Affiliation:
1. National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing, Institute of Engineering Technology University of Science and Technology Beijing Beijing 100083 China
2. Shunde Innovation School University of Science and Technology Beijing Foshan 528399 China
3. State Key Laboratory for Powder Metallurgy Central South University Changsha 410083 China
4. School of Physiology, Pharmacology and Neuroscience University of Bristol Bristol BS8 1TD UK
Abstract
Herein, commercially pure titanium parts (CP‐Ti) are fabricated successfully by laser powder bed fusion using cost‐effective ball milling (BM) near‐spherical powder. The hardness, microstructure, wear, and corrosion performances of BM‐Ti parts are investigated systemically. The microstructure of the fabricated BM‐Ti sample consists of α′ phase. Compared with the sample fabricated using gas‐atomized (GA) spherical powder, the BM‐Ti sample exhibits higher hardness (354 HV vs 240 HV) due to grain refinement. Owing to the formation of a denser oxide film and finger gain, BM‐Ti exhibits a higher corrosion resistance than that of GA‐Ti and forged Ti–6Al–4 V alloy. Under the same load, taking 2 N for example, the BM‐Ti sample exhibits a lower wear rate (1.03 × 10−12 m3 N−1 m−1) than that of the GA‐Ti sample (1.75 × 10−12 m3 N−1 m−1), and comparable to the forged Ti–6Al–4 V alloy (0.84 × 10−12 m3 N−1 m−1). The wear mechanism of the BM‐Ti sample and forged Ti–6Al–4 V alloy is abrasive wear accompanied by adhesion, while the mechanism for the GA‐Ti sample is a combination of delamination and adhesion wear. Together, enhanced wear and corrosion performances of CP‐Ti fabricated using low‐cost BM near‐spherical powder widen its applications in the fields of biomedical further.
Funder
National Natural Science Foundation of China
China Postdoctoral Science Foundation
Natural Science Foundation of Beijing Municipality
Subject
Condensed Matter Physics,General Materials Science