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采用选区激光熔化(SLM)制备了一种高γ′相含量的镍基高温合金，研究了不同温度的亚固溶处理对其微观组织的影响。结果表明：沉积态样品的显微组织为沿沉积方向定向生长的柱状晶，样品中再结晶晶粒比例约为2.47%;随着亚固溶温度的升高，样品内部位错密度逐渐降低，再结晶比例呈上升趋势；时效处理后，组织中粗大的γ′相由筏状向立方状转变；经1240℃亚固溶处理0.5 h后，样品的再结晶占比为3.24%,组织中粗大γ′相阻碍了晶界迁移，有效抑制了再结晶的扩展，使样品保持柱状晶结构；经1250℃亚固溶处理0.5 h后，样品内部位错密度最低，再结晶占比达到42.88%,组织由细小的柱状晶转变为等轴晶。
Abstract：A nickel-based superalloy with high γ′ phase content was prepared by selective laser melting(SLM), and the effect of sub-solvus treatment at different temperatures on its microstructure was studied. The results show that the microstructure of the as-deposited sample consists of columnar grains with directional growth along the deposition direction, and the proportion of recrystallized grains in the samples is about 2.47%. With the increase of sub-solvus temperature, the dislocation density inside the sample gradually decreases, and the recrystallization proportion shows an upward trend. After aging treatment, the coarse γ′ phase in the microstructure transforms from raft shaped to cubic shaped. After sub-solvus treatment at 1240 ℃ for 0.5 h, the proportion of recrystallization in the sample is 3.24%. The coarse γ′ phase in the microstructure hinders the grain boundary migration, and effectively suppressing the expansion of recrystallization and maintaining the columnar grain structure of the sample. After sub-solvus treatment at 1250 ℃ for 0.5 h, the internal dislocation density of the sample is the lowest, the proportion of recrystallization reaches 42.88%, and the microstructure changes from small columnar grains to equiaxed grains.
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基本信息:
DOI：10.13289/j.issn.1009-6264.2024-0297
中图分类号:TG156.94;TG132.3;TG665
引用信息:
[1]梁爽,刘智鑫,周叔恒等.亚固溶处理对一种SLM高温合金微观组织的影响[J].材料热处理学报,2025,46(04):74-80.DOI:10.13289/j.issn.1009-6264.2024-0297.
基金信息:
辽宁省2022年度“兴辽英才计划”战略科技人才项目(XLYC2203187); 辽宁省自然科学基金(2021-YKLH-04); “营口英才计划”青年拔尖人才项目(2021-YLYC)