钛铝含量对IN718合金激光增材试样组织性能的影响
Effect of Ti+Al Content on the Microstructure and Properties of Laser Additive Specimens of IN718 Alloy
雷远涛 1伍文星 1阳彤 1申龙章 1陈勇 1朱红梅 1邱长军1
作者信息
- 1. 南华大学超常环境下装备安全服役技术湖南省重点实验室,湖南衡阳 421001
- 折叠
摘要
为提升激光增材IN718合金部件的力学性能和服役温度,按梯度增加Ti+Al含量制备了五种改进型IN718激光增材样品,采用万能实验机、SEM、XRD和JMatpro软件等研究了样品的常温和高温力学性能及组织结构.结果表明,随着Ti+Al含量的增加,γ'相占比逐渐上升,样品室温强度增大而延伸率明显下降.当Ti+Al含量增加到7.6％时,样品中的γ'析出相占比是γ相的5倍,硬度为55.6 HRC,因脆性相的大量析出导致裂纹萌生;经1 100 ℃ × 1 h+850 ℃×8h热处理后的样品在850 ℃时的强度随Ti+Al含量的增加先升高后降低,Ti+Al含量为5.6％时其高温屈服强度和延伸率达到最大值,分别为553 MPa和12％,且各向同性,此时γ'析出相和γ相占比接近,分别为41.5％和39.9％.在后续研究中,可将标准IN718合金中的Ti+Al含量提高到5.6％,恰当利用γ'强化获得优良的高温力学性能和激光增材工艺相容性.
Abstract
To improve the mechanical properties and service temperature of laser additive IN718 alloy com-ponents,five improved IN718 laser additive samples with the gradient increase in Ti+Al content were pre-pared.The mechanical properties at room temperature and high temperature and microstructure of the samples were studied by universal testing machine,SEM,XRD,and JMatpro software.The results indicate that as the Ti+Al content increases,the proportiaon of γ'phase gradually rises,with an increase in room temperature strength and a significant decrease in elongation.When the content of Ti+Al reaches 7.6％,the proportion of γ'precipitated phase is 5 times that of γ phase and the hardness is 55.6 HRC.Then the abundant precipitation of brittle phases results in the initiation of cracks.After undergoing 1 100 ℃×1 h+850 ℃×8 h heat treatment,the high-temperature strength of the samples at 850 ℃ initially increases and then decreases with the increasing Ti+Al content.And when the content of Ti+Al arrives at 5.6％,the high-temperature yield strength and elongation of the samples reach the maximum value of 553 MPa and 12％,respectively,showing consistency in all directions.Meanwhile,the proportions of γ'precipitated phase and γ phase are close(41.5％and 39.9％,respectively).In subsequent research,the Ti+Al content in standard IN718 alloy can be increased to 5.6％,and properly using γ'strengthening can obtain excellent high-temperature mechanical properties and compatibility of laser additive process.
关键词
激光增材制造/IN718合金/Ti+Al含量/力学性能/析出相Key words
laser additive manufacturing/IN718 alloy/Ti+Al content/mechanical property/precipitated phase引用本文复制引用
基金项目
国防科技重点实验室项目(JCKY61420052002)
中央军委装备发展部装备预研基金(61400040204)
国家重点研发计划(2017YFE0301300)
湖南省研究生科研创新项目(223YSC009)
出版年
2024
NETL
NSTL
万方数据