A novel approach to direct preparation of complete lath martensite microstructure in tool steel by selective laser melting

被引：44
作者：
Chen, Hongyu [1 ,2 ]
Gu, Dongdong [1 ,2 ]
Dai, Donghua [1 ,2 ]
Xia, Mujian [1 ,2 ]
Ma, Chenglong [1 ,2 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Yudao St 29, Nanjing 210016, Jiangsu, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Jiangsu Prov Engn Lab Laser Addit Mfg High Perfor, Yudao St 29, Nanjing 210016, Jiangsu, Peoples R China
来源：
MATERIALS LETTERS | 2018年 / 227卷
基金：
中国国家自然科学基金;
关键词：
Selective laser melting (SLM); Phase transformation; Microstructure; Grain boundaries; Microhardness; MECHANICAL-PROPERTIES; MARAGING-STEEL; EVOLUTION;
D O I：
10.1016/j.matlet.2018.05.042
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A direct preparation of complete lath martensite microstructure (transformation rate delta > 99%) in tool steel was successfully realized using selective laser melting (SLM) in conjunction with laser remelting (LR) technique. Ultrafine lath martensite with a high percentage of low-angle grain boundaries (LAGBs) (46.12%) was formed. This unique microstructure contributed to the prominent effect of dislocation rearrangement and entanglement within the substructure of martensite, leading to a significant improvement of mechanical properties. An ultrahigh microhardness of similar to 765.1 HV0.3 was obtained, which is much higher than the previously reported values of as-built SLM hardened steel such as H13 and maraging steel. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：128 / 131
页数：4
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