Formability, Microstructure and Properties of CxCrNiV Low-Alloy Steel Fabricated by Laser Melting Deposition

In this paper, three CrNiV series low-alloy steel with different C contents were fabricated by laser melting deposition (LMD) technique. Subsequently, the formability, microstructure and properties of LMD CxCrNiV low-alloy steel were evaluated. The results are as follows: with the increase in C content, the formability of low-alloy steel has decreased. All the samples were mainly composed of α-Fe (martensite) phase, and carbides were found to be dispersively distributed in the microstructure. As the C content increased, the martensite lath was remarkably refined, and the average grain size decreased from 2.76 to 2.33 μm. The tensile strength of the deposited samples increased by 21.58%, and the yield strength increased by 44.68%. As the formability of the deposited sample decreased, the elongation decreased by 35.93%. The average microhardness of deposited samples increased by 26.76%. When the content of C is higher, abrasion-resistant framework can be formed between carbides, and the peeling phenomenon during wear will be greatly reduced, the wear resistance is improved by 86.78%.