Author(s)

Lianyun Xi，Suiyuan Chen, Jing Liang, Tong Cui, Changsheng Liu

Corresponding Author

Lianyun Xi

Abstract

Based on the characteristics of metallurgical non-equilibrium solidification behavior during laser additive manufacturing alloy steel, the basic theory of thermodynamics of martensitic transformation precipitating in the process of selective laser melting deposition of alloy steel were introduced, then binary, ternary and multicomponent alloy steel systems thermodynamic evolution process were revealed. Combined with selective laser melting deposited 24CrNiMo alloy steel experiment, laser additive manufacturing 24CrNiMo alloy steel CCT curve and the thermodynamic data-martensite transformation starting temperature were simulated. Simulated by using simulation software and calculated with empirical formula the temperature of martensitic transformation starting point are 366.6℃ and 361.102℃ respectively. It is expected that these studies can provide theoretical reference for laser additive manufacturing brake disc of High-speed rail.

Keywords

laser additive manufacturing, empirical formula, 24CrNiMo alloy steel, thermodynamic of martensitic transformation.