中国激光, 2017, 44 (2): 0202007, 网络出版: 2017-02-22
选区激光熔化Hastelloy-X合金组织演变及拉伸性能 下载: 584次
Microstructural Evolution and Tensile Property of Hastelloy-X Alloys Produced by Selective Laser Melting
激光技术 选区激光熔化 哈氏合金 微观组织 拉伸性能 laser technique selective laser melting Hastelloy-X alloy microstructure tensile property
摘要
采用选区激光熔化技术加工哈氏合金试样并进行后处理,分别分析了沉积态、热处理态、热处理+热等静压态试样的宏观/微观组织特征,并测试了室温/高温拉伸性能。结果表明,沉积态试样横向/纵向均出现微裂纹,但未出现析出物。热处理后,横向组织为等轴晶,纵向组织为交错分布的细柱状晶和粗柱状晶,这些晶粒内部存在两种形态差异显著的析出物。热等静压处理后,晶粒显著长大,析出物分布均匀化,试样的室温拉伸性能达到锻件标准;相比于纵向拉伸性能,横向拉伸性能具有高强度低塑性的特征。
Abstract
Hastelloy-X specimens are processed and post-processed by the selective laser melting technique, the macro-/micro-structural characteristics of as-deposited, heat-treated and heat-plus-heat-isostatic-pressure-treated specimens are analyzed, and the tensile property at room/high temperature is tested, respectively. The results indicate that the micro-cracks appear at both horizontal and vertical directions of as-deposited specimens, but no precipitates occur. After heat treatments, the transverse microstructures become equiaxed grains, while the longitudinal microstructures are interleaved fine or coarse columnar grains, and within these grains, there exist two kinds of precipitates with quite different morphologies. After the hot-isostatic-pressure treatment, the grains grow up significantly, the distribution of the precipitates are homogenously distributed, and the tensile property at room temperature reaches the forging standard. The transverse tensile property is characterized by high strength and low plasticity compared to the longitudinal one.
侯慧鹏, 梁永朝, 何艳丽, 李雅莉, 雷力明. 选区激光熔化Hastelloy-X合金组织演变及拉伸性能[J]. 中国激光, 2017, 44(2): 0202007. Hou Huipeng, Liang Yongchao, He Yanli, Li Yali, Lei Liming. Microstructural Evolution and Tensile Property of Hastelloy-X Alloys Produced by Selective Laser Melting[J]. Chinese Journal of Lasers, 2017, 44(2): 0202007.