添加式制造的 IN738LC 镍基超级合金中的裂纹抑制和结晶纹理控制

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-13 DOI:10.1016/j.jmrt.2024.09.101
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引用次数: 0

摘要

由于杂散等轴晶粒的形成及其对开裂的高敏感性,定向凝固镍基超合金的快速成型制造仍然是一项重大挑战,尤其是对于高容量γ´型镍基超合金而言。本研究提出了一种基于温度场管理的新策略,以防止 IN738LC 超合金在激光粉末床熔化 (LPBF) 过程中出现热裂纹并控制结晶纹理。研究了激光参数和基底预热对 IN738LC 超合金裂纹密度、熔池形态和纹理的影响。使用离散元素模型(DEM)和流体体积法(VOF)模拟了熔池的流体动力学和热行为。确定了实现无缺陷 IN738LC 样品的加工窗口,并发现该窗口受基底预热的影响很大。基底预热温度为 350 °C,扩大了加工窗口,体积能量密度从未预热时的 42.9 至 62.5 J/mm³ 增加到 40-75 J/mm³。由于降低了温度梯度和冷却速度,减少了开裂的可能性,从而扩大了加工窗口。在 LPBF 加工的 IN738LC 超耐热合金中,成功实现了一种独特的结晶层状微结构 (CLM),包括沿构建方向的一个 <110>取向的主层和一个 <100>取向的子层。从熔池内的温度梯度和凝固速率两个方面讨论了获得这种 CLM 的凝固条件。这项工作为制备具有特定纹理的无裂纹γ´-Ni 基超合金提供了新的见解和方法,有利于改善高温性能。
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Crack inhibition and crystallographic texture control in an additively manufactured IN738LC Ni-based superalloy

The additive manufacturing of directionally solidified Ni-based superalloys remains a significant challenge due to the formation of stray equiaxed grains and their high susceptibility to cracking, particularly for high-volume γ´-type Ni-based superalloys. In this study, a novel strategy based on temperature field management was proposed to prevent hot cracking and control crystallographic texture during laser powder bed fusion (LPBF) of IN738LC superalloy. The influence of laser parameters and substrate preheating on crack density, melt pool morphology, and texture of IN738LC superalloy was investigated. The fluid dynamics and thermal behavior of melt pool was simulated using the discrete element model (DEM) and volume of fluid (VOF) method. The processing window for achieving defect-free IN738LC samples was established and was found to be highly affected by substrate preheating. Substrate preheating at 350 °C resulted in expanded processing window, with the volume energy density ranging from 42.9 to 62.5 J/mm³ without substrate preheating to 40–75 J/mm³. The enlarged processing window was achieved by reducing cracking susceptibility due to the reduced temperature gradient and cooling rate. A unique crystallographic lamellar microstructure (CLM), comprising a <110>-oriented major layer and <100>-oriented sub-layer along the building direction, was successfully achieved in the LPBF-processed IN738LC superalloy. The solidification conditions for obtaining such a CLM were discussed on the aspects of temperature gradient and solidification rate within the melt pool. This work provides new insights and methods for preparing crack-free γ´-Ni-based superalloys with specific textures, which is favorable for improving the high-temperature properties.

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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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