| 引用本文: | 郭宇豪,赵学平,白朴存,曹宇,侯小虎,刘飞.固溶处理对选区激光熔化Inconel718合金组织与硬度的影响∗[J].中国表面工程,2021,34(2):114~121 |
| Guo Yuhao,Zhao Xueping,Bai Pucun,Cao Yu,Hou Xiaohu,Liu Fei.Effects of Solution Treatment on Microstructure and Hardness of Inconel 718 Alloy Fabricated by Selective Laser Melting[J].China Surface Engineering,2021,34(2):114~121 |
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| 摘要: |
| 利用选区激光熔化技术制备 Inconel 718 合金,对其在不同温度、时间和冷却条件下进行热处理。 采用扫描电子显微镜、 电子背散射衍射仪和显微硬度计研究不同热处理工艺条件下 Inconel 718 合金的微观组织与硬度。 结果表明:当热处理温度为 1 080 ℃时,沉积态合金中的束状亚结构消失、第二相含量减少,随着保温时间的延长,晶粒开始由非均匀柱状晶转变为再结晶晶粒,残余应力集中区和小角度晶界逐渐减少,并且形成<111>60°退火孪晶,硬度从 292 HV 降低至 253 HV;当热处理温度为 1 130 ℃时,沉积态合金中的非平衡组织全部发生再结晶,残余应力集中区基本消失,晶粒内部出现均匀的退火孪晶,硬度保持在 220 HV 左右;对于 1 080 ℃ / 60 min 热处理试样,随炉冷却方式的硬度高达 431 HV,其较高的硬度主要与随炉冷却形成大量的亚结构和析出相有关。 |
| 关键词: 选区激光熔化 Inconel 718 合金 再结晶 残余应力 硬度 |
| DOI：10.11933/j.issn.1007-9289.20210127001 |
| 分类号:TG132;TG156 |
| 基金项目:国家自然科学基金(11672140, 11762014)、内蒙古自治区科技重大专项(ZDZX2018031)和内蒙古自治区科技计划(201803005)资助项目 |
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| Effects of Solution Treatment on Microstructure and Hardness of Inconel 718 Alloy Fabricated by Selective Laser Melting |
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Guo Yuhao, Zhao Xueping, Bai Pucun, Cao Yu, Hou Xiaohu, Liu Fei
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College of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051 , China
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| Abstract: |
| Inconel 718 alloy was prepared by selective laser melting technique and then processed under different temperature, time and cooling conditions. The microstructure and hardness of Inconel 718 alloy under different heat treatment conditions were investigated by scanning electron microscope, electron backscattering diffractometer and microhardness tester. The results show that when the heat treatment temperature is 1 080 ℃ , the bundle substructure in the deposited alloy disappears and the content of the second phase de- creases. With the increase of the heat treatment time, the grains start to change from non-uniform columnar grains to recrystallized grains, the residual stress concentration areas and small-angle grain boundaries gradually decrease, and <111>60° annealing twins are formed, the hardness decreases from 292 HV to 253 HV. When the heat treatment temperature is 1 130 ℃ , all the non-equilibrium structures in the deposited alloy recrystallize, the residual stress concentration area almost disappears, the uniform annealing twins ap- peared in the grains, and the hardness remained at about 220 HV. The hardness of sample heat treated at 1 080 ℃ / 60 min is as high as 431 HV, and the higher hardness is mainly related to the formation of a large number of substructures and precipitates with furnace cooling. |
| Key words: selective laser melting Inconel 718 alloy recrystallization residual stress hardness |
