Additive manufacturing product and method of producing same

An additive manufacturing product comprising a steel matrix and ceramic particles dispersed in the steel matrix, wherein

• the steel matrix comprises a chemical composition containing, in mass %,
• C:
• 0.030% or more and 0.800% or less,
• Si:
• 0.01% or more and 2.50% or less,
• Mn:
• 0.10% or more and 8.00% or less,
• P:
• 0.100% or less,
• S:
• 0.0200% or less,
• A1:
• 0.100% or less,
• N:
• 0.1000% or less, and
• O:
• 0.5000% or less,
• with the balance being Fe and inevitable impurity,
• and a steel microstructure wherein
• area fraction of pores is 0.50% or less,
• area fraction of martensite in a region excluding pores is 90% or more,
• average aspect ratio of prior austenite grains is 1.5 or more, and
• LHA/L, high-angle grain boundary length LHA divided by grain boundary length L with a misorientation angle of 20° or more and 50° or less, is 2.0 or more, and
• melting point of the ceramic particles is 2000° C. or more.