添加剂制造的marm509的热稳定性

Shreehard Sahu, B. Kumar, S. Sahoo, B. N. Jaya, D. Srinivasan
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摘要

采用激光粉末床熔合(LPBF)工艺研究了具有优异的耐高温氧化和耐热腐蚀性能的Co基高温合金marm509。通过对比铸态(AsP)和热处理态(HT)下的显微组织和力学性能,以及铸态取向(纵向(L)和横向(T))的变化,确定了该合金的工作范围。AsP条件具有明显的细胞微观结构(500-600 nm), 50-60 nm的碳化物颗粒装饰细胞边界。L构筑取向具有较强的织构,晶粒尺寸为8 ~ 35 μm(长轴方向),晶粒长径比为4,而T构筑取向的晶粒尺寸为5 ~ 28 μm,呈等轴双模态。室温力学性能在L和T之间存在差异,其中T的硬度比L高15%,屈服强度(YS)比L高34%,延伸率比L低30%。经过1250℃短循环热处理后,焊缝组织和晶胞边界被破坏,在L(沿长轴25-33 μm)和T (5-42 μm)方向上均有大量晶粒长大,碳化物(250-350 nm)粗化。位错密度显著降低,表明再结晶,基体晶格参数显著下降,表明溶质耗竭有助于碳化物析出生长和富集。L的屈服强度从860mpa下降到740mpa, T的屈服强度从1150mpa下降到840MPa, L的塑性从14%增加到23%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal Stability of Additively Manufactured Mar M 509
Co based superalloy Mar M 509 having excellent high temperature oxidation and hot corrosion resistance is studied via the laser powder bed fusion (LPBF) process. The microstructure and mechanical properties of Mar M 509 in the as-printed (AsP) and heat-treated (HT) condition are compared, as a function of two build orientations (longitudinal (L) and transverse (T)), to establish a working range for application of the alloy. The AsP condition has a distinct cellular microstructure (500–600 nm) with 50–60 nm carbide particles decorating the cell boundaries. The L build orientation displays a strong <001> texture, has columnar grains with a grain size of 8–35 μm (along major axis) and a grain aspect ratio of 4, while the T orientation displays a more equiaxed, but bi-modal microstructure with a grain size of 5–28 μm. The room temperature mechanical properties show variability between L and T with T having 15% higher hardness and 34% higher 0.2% yield strength (YS), 30% lower elongation than L. After a short cycle heat treatment at 1250°C, the weld bead structure and cellular boundaries are broken down and there is substantial grain growth in both L (25–33 μm along major axis) and T orientations (5–42 μm), along with coarsening of carbides (250–350 nm). The dislocation density reduces substantially, indicating recrystallisation, and the lattice parameter of the matrix drops significantly, suggesting solute depletion that contributes to precipitate growth and enrichment of the carbides. There is a drop in the yield strength from 860 MPa to 740 MPa in L and from 1150 MPa to 840MPa in T and an increase in ductility from 14% to 23% in L.
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