Intelligent Manufacturing Technology

Corrosion Behavior of the S136 Mold Steel Fabricated by Selective Laser Melting

  • Shi-Feng Wen ,
  • Xian-Tai Ji ,
  • Yan Zhou ,
  • Chang-Jun Han ,
  • Qing-Song Wei ,
  • Yu-Sheng Shi
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  • 1. State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

收稿日期: 2017-11-13

  网络出版日期: 2019-07-23

基金资助

Supported by National Natural Science Foundation of China (Grant No. 51605176), National Hitech R&D Program of China (863 Program, Grant No. 2015AA042501), Hubei Provincial Natural Science Foundation of China (Grant No. 2018CFB502), Guangdong Provincial Technology Major Project of China (Grant No. 2017B090911007), State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (Grant No. P2019006), and Engineering Research Center of RockSoil Drilling & Excavation and Protection, Ministry of Education (Grant No. 201804)

Corrosion Behavior of the S136 Mold Steel Fabricated by Selective Laser Melting

  • Shi-Feng Wen ,
  • Xian-Tai Ji ,
  • Yan Zhou ,
  • Chang-Jun Han ,
  • Qing-Song Wei ,
  • Yu-Sheng Shi
Expand
  • 1. State Key Laboratory of Materials Processing and Die & Mold Technology, School of Materials Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

Received date: 2017-11-13

  Online published: 2019-07-23

Supported by

Supported by National Natural Science Foundation of China (Grant No. 51605176), National Hitech R&D Program of China (863 Program, Grant No. 2015AA042501), Hubei Provincial Natural Science Foundation of China (Grant No. 2018CFB502), Guangdong Provincial Technology Major Project of China (Grant No. 2017B090911007), State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology (Grant No. P2019006), and Engineering Research Center of RockSoil Drilling & Excavation and Protection, Ministry of Education (Grant No. 201804)

摘要

The selective laser melting (SLM) method has a great potential for fabricating injection mold with complex structure. However, the microstructure and performance of the SLM molds show significantly different from those manufactured by traditional technologies. In this study, the microstructure, hardness and especially corrosion behavior of the samples fabricated by SLM and casting were investigated. The XRD results exhibit that the γ-Fe phase is only obtained in the SLM parts, and the α-Fe peak slightly moves to low diffraction angle compared with casting counterparts. Due to the rapid cooling rate, the SLM samples have fine cellular microstructures while the casting ones have coarse grains with obvious elements segregation. Besides, the SLM samples show anisotropy, hardness of side view and top view are 48.73 and 50.31 HRC respectively, which are 20% higher than that of casting ones. Corrosion results show that the SLM samples have the better anti-corrosion resistance (in a 6% FeCl3 solution for 48 h) but the deeper corrosion pits than casting ones. Finally, the performance of the SLM molds could meet the requirement of injecting production. Moreover, the molds especially present a significant decrease (20%) of cooling time and increases of cooling uniformity due to the customized conformal cooling channels.

本文引用格式

Shi-Feng Wen , Xian-Tai Ji , Yan Zhou , Chang-Jun Han , Qing-Song Wei , Yu-Sheng Shi . Corrosion Behavior of the S136 Mold Steel Fabricated by Selective Laser Melting[J]. Chinese Journal of Mechanical Engineering, 2018 , 31(6) : 108 -108 . DOI: 10.1186/s10033-018-0312-8

Abstract

The selective laser melting (SLM) method has a great potential for fabricating injection mold with complex structure. However, the microstructure and performance of the SLM molds show significantly different from those manufactured by traditional technologies. In this study, the microstructure, hardness and especially corrosion behavior of the samples fabricated by SLM and casting were investigated. The XRD results exhibit that the γ-Fe phase is only obtained in the SLM parts, and the α-Fe peak slightly moves to low diffraction angle compared with casting counterparts. Due to the rapid cooling rate, the SLM samples have fine cellular microstructures while the casting ones have coarse grains with obvious elements segregation. Besides, the SLM samples show anisotropy, hardness of side view and top view are 48.73 and 50.31 HRC respectively, which are 20% higher than that of casting ones. Corrosion results show that the SLM samples have the better anti-corrosion resistance (in a 6% FeCl3 solution for 48 h) but the deeper corrosion pits than casting ones. Finally, the performance of the SLM molds could meet the requirement of injecting production. Moreover, the molds especially present a significant decrease (20%) of cooling time and increases of cooling uniformity due to the customized conformal cooling channels.

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