Defects Suppression and Mechanism in Additive Manufacturing High-volume SiC Reinforced Maraging Steel

doi:10.3901/JME.2021.17.243

Abstract

Abstract: With the increasingly stringent requirements of aerospace and transportation on high-performance materials, high-volume fraction ceramic reinforced metal matrix composites (MMCs) have become a developing trend. Taking the advantages of laser additive manufacturing in-situ processing multi-component materials, 15vol.% SiC ceramic reinforced maraging steel (MS) MMCs are prepared by selective laser melting (SLM). Facing the compatibility and cracking problems raised between SiC and metal matrix, great efforts on the defect's suppression during SLM process are taken from various aspects, including laser remelting, substrate preheating, design of support and build directions; among which substrate preheating suppressed cracking significantly. In addition, the effects of SiC on microstructure, phase structure and transition, and hardness are investigated, which could potentially associate with cracking. The microstructure of MMC is strip and coarse cellular structures, with Si-rich regions. The addition of SiC promotes the transformation of martensite in MS to austenite in MMC, since MMC consists of majority austenite and a small amount of martensite distributed between dendrites. Notably, most of these dendrites are high-angle grain boundaries, indicating that a large number of dislocations are formed in MMC. Furthermore, the high-volume SiC increases the hardness of the MS matrix significantly.

Key words: selective laser melting, maraging steel, metal matrix composite, crack suppression, microstructure

CLC Number:

TG665
TB33

DENG Guowei, TAN Chaolin, WANG Di, YANG Yongqiang. Defects Suppression and Mechanism in Additive Manufacturing High-volume SiC Reinforced Maraging Steel[J]. Journal of Mechanical Engineering, 2021, 57(17): 243-252.

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