Carbon nanotube (CNT) reinforced 316L stainless steel composites made by laser powder bed fusion: Microstructure and wear response

被引：39
作者：
Yin, Houshang [1 ]
Yang, Jingfan [1 ]
Zhang, Yuying [2 ]
Crilly, Larkin [3 ]
Jackson, Robert L. [3 ]
Lou, Xiaoyuan [1 ]
机构：
[1] Auburn Univ, Mat Res & Educ Ctr, Dept Mech Engn, Auburn, AL 36849 USA
[2] Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 USA
[3] Auburn Univ, Dept Mech Engn, Auburn, AL 36849 USA
来源：
WEAR | 2022年 / 496卷
关键词：
Laser powder bed fusion additive manufacturing; Austenitic stainless steel; Carbon nanotube; Metal matrix composite; Wear; Friction; Tribology; Hardness; MECHANICAL-PROPERTIES; BEHAVIOR; NANOCOMPOSITES; EVOLUTION; PERFORMANCE; STRENGTH; SIMULATION; PARTICLES; DUCTILITY; FRICTION;
D O I：
10.1016/j.wear.2022.204281
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Carbon nanotube (CNT) reinforced 316L stainless steel (SS) composites were fabricated by laser powder bed fusion (LPBF) additive manufacturing (AM). This study focuses on microstructure evolution, hardness, and wear behavior. The wear behavior for AM 316L SS and 1 wt% CNT/316L SS was studied by a dry sliding test under normal loads of 10, 15, and 25 N. The addition of CNT to 316L SS led to the change of solidification mode from cellular/columnar to dendritic growth, producing grain refinement. Nanoscale dendrites were observed. Although TEM characterization confirmed the existence of CNT in cell interior, most CNT were damaged, resulting in carbon material segregation along cellular/dendritic boundaries. The wear rate was found dramatically decreased due to the improved hardness. Compared to the adhesive and abrasive wear in AM 316L SS, the wear mechanism of CNT/316L composite was adhesion and oxidative wear. Enhanced cellular/dendritic boundary strengthening by carbon segregation was the main strengthening mechanism of CNT/316L composite.
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页数：14
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