Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting
AISI 420 martensitic stainless steel with excellent corrosion resistance is an ideal choice for plastic injection molds. However, injection molds are easy to fail in high–intensity and high-pressure environments. Therefore, it's necessary to improve their hardness and tensile strength to prolon...
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doaj-64a337be399849e38453b9e225a050dd2020-11-25T00:58:14ZengElsevierMaterials & Design0264-12752020-02-01187Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser meltingYunfei Liu0Mingkai Tang1Qi Hu2Yuanjie Zhang3Lichao Zhang4State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaCorresponding author.; State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaAISI 420 martensitic stainless steel with excellent corrosion resistance is an ideal choice for plastic injection molds. However, injection molds are easy to fail in high–intensity and high-pressure environments. Therefore, it's necessary to improve their hardness and tensile strength to prolong the service life of injection molds. In this work, Selective laser melting (SLM), an additive manufacturing technology was utilized to process 5 wt% TiC/AISI 420 composites. The influence of volumetric energy density (η) on relative density, constitutional phases, microstructure and mechanical properties were investigated. The results indicated that insufficient energy input could cause defects such as pores and crack in the parts, while a part with near-full density could be fabricated if the applied η was properly settled. The ring-like structure that was comprised of thin “metal-ceramic” interface along the grain boundary was distributed more uniform with the increase of applied η. The SLM-processed sample showed a best mechanical properties at highly applied η (320 W, 850 mm/s, η = 85.6 J/mm3). It had an elevated micro-hardness (592.2 ± 53.6 Hv), an enhanced tensile strength (1452.5 MPa) and an improved elongation (8.65%), which was higher than that of the cast AISI 420 stainless steel. The research would provide theoretical support for the application of SLM-processed AISI420 stainless steel composites. Keywords: Selective laser melting, TiC/AISI420 composites, Densification, Microstructure, Mechanical propertieshttp://www.sciencedirect.com/science/article/pii/S0264127519308196 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yunfei Liu Mingkai Tang Qi Hu Yuanjie Zhang Lichao Zhang |
spellingShingle |
Yunfei Liu Mingkai Tang Qi Hu Yuanjie Zhang Lichao Zhang Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting Materials & Design |
author_facet |
Yunfei Liu Mingkai Tang Qi Hu Yuanjie Zhang Lichao Zhang |
author_sort |
Yunfei Liu |
title |
Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting |
title_short |
Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting |
title_full |
Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting |
title_fullStr |
Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting |
title_full_unstemmed |
Densification behavior, microstructural evolution, and mechanical properties of TiC/AISI420 stainless steel composites fabricated by selective laser melting |
title_sort |
densification behavior, microstructural evolution, and mechanical properties of tic/aisi420 stainless steel composites fabricated by selective laser melting |
publisher |
Elsevier |
series |
Materials & Design |
issn |
0264-1275 |
publishDate |
2020-02-01 |
description |
AISI 420 martensitic stainless steel with excellent corrosion resistance is an ideal choice for plastic injection molds. However, injection molds are easy to fail in high–intensity and high-pressure environments. Therefore, it's necessary to improve their hardness and tensile strength to prolong the service life of injection molds. In this work, Selective laser melting (SLM), an additive manufacturing technology was utilized to process 5 wt% TiC/AISI 420 composites. The influence of volumetric energy density (η) on relative density, constitutional phases, microstructure and mechanical properties were investigated. The results indicated that insufficient energy input could cause defects such as pores and crack in the parts, while a part with near-full density could be fabricated if the applied η was properly settled. The ring-like structure that was comprised of thin “metal-ceramic” interface along the grain boundary was distributed more uniform with the increase of applied η. The SLM-processed sample showed a best mechanical properties at highly applied η (320 W, 850 mm/s, η = 85.6 J/mm3). It had an elevated micro-hardness (592.2 ± 53.6 Hv), an enhanced tensile strength (1452.5 MPa) and an improved elongation (8.65%), which was higher than that of the cast AISI 420 stainless steel. The research would provide theoretical support for the application of SLM-processed AISI420 stainless steel composites. Keywords: Selective laser melting, TiC/AISI420 composites, Densification, Microstructure, Mechanical properties |
url |
http://www.sciencedirect.com/science/article/pii/S0264127519308196 |
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