The objects of the investigation are the powder of 12Kh18N10T stainless steel of the 20–63 μm powder and experimental samples formed based on it by selective laser melting (SLM). The powder was fabricated by argon atomization at a temperature of 1640°C and pressure of 27 bar. The particle structure is dendritic–cellular, and the cellular structure prevails with a decrease in the particle size (<35 μm), while the dendritic almost disappears. The characteristic particle size is d₅₀ = 37 μm and d₁₀₀ = 67 μm. The differential distribution is close to the Gaussian form, while asymmetry is associated with the satellite character and the presence of innumerous particles smaller than 20 μm in size. The powder fluidity is 3.27 g/s, while the apparent density is 4.41 g/cm³. The density of the samples of the 12Kh18N10T steel samples grown using a Concept Laser M2 installation under a laser power of 180 W and speed of 700 mm/s is 7.89 g/cm³ on average. Since the density of compact steel is 7.95 g/cm³, the material is rather high-density. The microstructure of the 12Kh18N10T sample is continuous, has no pores and cracks, and comprises the austenite solid solution. The average size of coherent scattering regions in the grain bulk is 19 nm. The arc-shaped interfaces of parallel semicircular tracks are formed due to the crystallization heat removal during the SLM. The elongated crystallites in the tracks are oriented inwards from the arc-shaped interface. The microhardness of the samples in the transverse plane of the metallographic section is higher than the microhardness of the planar plane. Herewith, the microhardness of the samples formed by the SLM method is higher than that of the standard compact alloy. The ultimate strength and relative elongation are 651 MPa and 47%, respectively. An increase in strength is apparently due to refining structural parameters after SLM. The fracture surface of the samples is characteristic of the clearly pronounced viscous type.

中文翻译：

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选择性激光熔炼制备的耐腐蚀钢的组织和性能

研究的对象是20-63μm粉末的12Kh18N10T不锈钢粉末和通过选择性激光熔融（SLM）在其基础上形成的实验样品。通过在1640℃的温度和27巴的压力下的氩气雾化来制造粉末。颗粒结构是树突状细胞，而细胞结构占优势，粒径减小（<35μm），而树突状细胞几乎消失。特征粒径为d ₅₀ = 37μm和d ₁₀₀= 67微米。微分分布接近于高斯形式，而不对称性与卫星特征和尺寸小于20μm的无数粒子的存在有关。粉末流动性为3.27g / s，而表观密度为4.41g / cm ³。使用Concept Laser M2设备在180 W的激光功率和700 mm / s的速度下生长的12Kh18N10T钢样品的样品密度平均为7.89 g / cm ³。由于致密钢的密度为7.95 g / cm ³，该材料是相当高密度的。12Kh18N10T样品的微观结构是连续的，没有孔和裂纹，并且包含奥氏体固溶体。晶粒体积中相干散射区的平均尺寸为19 nm。平行的半圆形轨道的弧形界面是由于SLM期间的结晶散热而形成的。轨道中的细长微晶从弧形界面向内定向。样品在金相横截面的显微硬度高于平面的显微硬度。因此，通过SLM方法形成的样品的显微硬度高于标准致密合金的显微硬度。极限强度和相对伸长率分别为651 MPa和47％。强度增加显然是由于在SLM之后改进了结构参数。样品的断裂表面是明显突出的粘性类型的特征。