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Electron-beam additive manufacturing of high-nitrogen steel: Microstructure and tensile properties

机译：高氮钢的电子束添加剂制造：微观结构和拉伸性能

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High nitrogen steel billets were successfully produced using electron-beam additive manufacturing technique with a Fe-20.7Cr-22.2Mn-0.3Ni-0.6Si-0.15C-0.53 N (wt. %) steel rods as a raw material. Additively manufactured steel possesses a dual-phase structure with a 40% of ferrite phase. An increase in volume content of ferrite and dendritic morphology of the microstructure is associated with the significant decrease in manganese concentration in the melt from 22.2 to 10.8 wt°/o during additive manufacturing process and change in solidification mode. A preferential formation of austenitic dendrites with high nitrogen content (about 0.9 wt% of nitrogen) during early stages of solidification process leads to a depletion of the melt by N, Mn, Cr and further formation of interstitial-free ferrite in interdendritic regions. The inhomogeneity in phase composition assists lower strain hardening and ductility in the additively manufactured high-nitrogen steel in comparison with conventionally produced material at the preservation of high values of the yield strength. In tension of additively produced high nitrogen steel, plastic deformation develops in both phases but more intensive deformation, strain localization and nucleation of microcracks occur in ferrite. Fracture of additively manufactured steel develops mainly in transgranular regime with ductile fracture of ferritic regions and brittle fracture of austenitic dendrites due to high nitrogen content in γ-phase.
机译：使用电子束添加剂制造技术成功地生产高氮钢坯，用FE-20.7CR-22.2MN-0.3NI-0.6SI-0.15C-0.53N（WT.％）钢棒作为原料。橡皮制造的钢具有双相结构，具有40％的铁氧体相。微结构的铁素体和树突形态的体积含量的增加与熔体中锰浓度的显着降低在添加剂制造过程中从22.2-10.8wt°/ o的锰浓度和凝固模式变化的变化相关。在凝固过程的早期阶段期间，在凝固过程中具有高氮含量（约0.9wt％的氮气）的优先形成导致N，Mn，Cr的熔体耗尽，进一步形成间霉菌区内的间隙铁氧体。相对于常规生产的材料在保存屈服强度的高值下，相位组合物中的不均匀性有助于较低制造的高氮钢中的降低应变硬化和延展性。在加薄的高氮钢的张力中，塑性变形在两相中发生，但在铁素体中发生更加强烈的变形，应变局部化和微裂纹的成核。薄型制造钢的骨折主要以γ相的高氮含量为具有铁纹状区域的跨骨状区域和奥氏体树突的脆性断裂。

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