Abstract

This article discusses adjustment of processing modes of selective laser melting of powdered 03Kh16N15M3 steel allowing fabrication of lattice structures with steady parameters. On the basis of statistical analysis of sizes of cells, ribs, and nodes in cross section parallel to the growth direction of lattice structures of two sizes of ribs and voids (400 × 1000 and 300 × 600 μm), the process variables providing fabrication of items with the most stable sizes along the height of the structure have been determined. The sizes of the main elements of the lattice structure have been determined using a scanning electron microscope; the crystallographic texture and material structure have been determined using X-ray structural analysis. It has been determined that increase in laser power leads to increase in distortions in crystalline structure and decrease in the lattice constant of the material of lattice structures. The highest distortions of the structure have been detected in ribs of lattice structures as well as in items with smaller sizes of ribs and voids. The material of the considered lattice structures is characterized by axial texture, for which crystallographic axes <100> are oriented parallel to the growth direction. The degree of manifestation of the axial texture component depends on the laser power used for growing of lattice structures. The samples obtained by minimum radiation power are characterized by a scattered axial texture, which is dictated by an increase in the number of chaotically oriented grains with a simultaneous decrease in the bulk of strictly oriented columnar crystals, located mainly in the vicinity of the axis of the ribs of the lattice structure. The texture sharpness in lattice samples with voids of small size is higher than that in samples with voids of large size.

中文翻译：

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03Kh16N15M3粉末钢的选择性激光熔化制备晶格结构的规律

摘要

本文讨论了对粉末状03Kh16N15M3钢进行选择性激光熔化的加工模式的调整，以制造具有稳定参数的晶格结构。在对平行于两种大小的肋骨和空隙（400×1000和300×600μm）的晶格结构生长方向的横截面的单元，肋骨和节的大小进行统计分析的基础上，工艺变量提供了制造确定了沿结构高度尺寸最稳定的项目。晶格结构主要元素的尺寸已经使用扫描电子显微镜确定；晶体结构和材料结构已通过X射线结构分析确定。已经确定，激光功率的增加导致晶体结构的畸变增加并且晶格结构的材料的晶格常数降低。在格子结构的肋骨以及肋骨和空隙的尺寸较小的项目中，已检测到结构的最高变形。所考虑的晶格结构的材料的特征在于轴向织构，对于该织构，结晶学轴<100>定向为平行于生长方向。轴向纹理分量的表现程度取决于用于生长晶格结构的激光功率。通过最小辐射功率获得的样品具有分散的轴向纹理，这是由于取向晶粒的数量增加而严格取向的柱状晶体的体积同时减少，主要位于晶格结构的肋轴附近。具有小尺寸空隙的晶格样品中的纹理清晰度高于具有大尺寸空隙的晶格样品中的纹理清晰度。