Microstructure and properties of ZrO₂-reinforced 24CrNiMoY alloy steel prepared by selective laser melting

ABSTRACT

The process parameters of selective laser melting (SLM) fabricated 24CrNiMoY alloy steel were optimised. Different contents of zirconia powder were added to the 24CrNiMoY alloy steel powder. With the optimum process parameters, the fabricated samples were characterised using various modern analysis methods. The results show that the main phase composition of 24CrNiMoY alloy steel is proecctectoid ferrite (PF) and granular bainite (GB). After the addition of zirconia, Lath bainite (LB) begins to appear, and with the increase of zirconia, the content of LB first increases and then decreases. When the zirconia content is 0.3%, the average micro hardness of the 24CrNiMoY alloy steel reaches the maximum and is 374 HV. In addition, the tensile strength is 811 MPa, the elongation is 6.7%, and the fracture surface shows ductile fracture.

KEYWORDS:

• High-speed train brake disc
• 24CrNiMoY alloy steel
• zirconia
• Bainite
• selective laser melting

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes on contributor

Suiyuan Chen studied materials science at Northeastern University and was awarded his PhD in 2004. Since 2008, he was working as a professor in the School of Materials Science and Engineering. His main research interests are: laser additive manufacturing technology, material surface treatment technology and advanced material preparation techniques.

Additional information

Funding

This work was financially supported by National Key R&D Program of China [2016YFB1100201], Green Manufacturing System Integration Project of the Industry and Information Ministry of China (2017), Project 201710145047 was supported by National Training Program of Innovation and Entrepreneurship for Undergraduates. Research and development plan for the future emerging industries in Shenyang [18-004-2-26].