热等静压处理对SLM成形AlSi10Mg疲劳性能影响
Influence of Hot Isostatic Pressing on the Fatigue Properties of AlSi10Mg Fabricated by Selective Laser Melting
张英伟 1高郑宇 1潘明旭 2董建舟 3王志国 2赵宇辉2
作者信息
- 1. 航空工业沈阳飞机工业(集团)有限公司,辽宁沈阳 110850
- 2. 中国科学院沈阳自动化研究所,辽宁沈阳 110016;中国科学院机器人与智能制造创新研究院,辽宁沈阳 110169
- 3. 中国科学院沈阳自动化研究所,辽宁沈阳 110016;沈阳航空航天大学机电工程学院,辽宁沈阳 110135
- 折叠
摘要
针对激光选区熔化(selective laser melting,SLM)成形AlSi10Mg合金疲劳寿命分散、疲劳性能存在显著各向异性等问题,对比分析了 SLM成形态及HIP处理态试样的S-N曲线及微观组织差异性.结果分析表明,由于成形方向造成SLM成形件内部缺陷分布呈现一定方向性,在相同应力水平下,SLM成形AlSi10Mg在X(Y)方向的疲劳寿命优于Z向;相同寿命条件下,X(Y)取样方向的疲劳强度比Z取样方向的疲劳强度高28％～49％.在490 ℃热等静压处理后,X(Y)、Z两个方向的疲劳寿命差异较SLM态明显减小.同时由于热等静压过程中,SLM沉积态组织中网状分布的枝晶发生了组织粗化和Si相粗化,导致HIP处理后疲劳强度尤其是在高应力水平下出现下降.
Abstract
This study addresses the issue of dispersed fatigue outcomes and anisotropic behavior in fatigue specimens produced by selective laser melting(SLM).The fatigue life(S-N)curves and microstructures of AlSi10Mg alloy,fabricated via SLM and subsequently subjected to Hot Isostatic Pressing(HIP)treatment,were compared and analyzed.The results showed that the fatigue life in X(Y)direction of AlSi10Mg is better than that in Z direction,because of the difference in the distribution di-rection of defects,attributed to the directional distribution of defects influenced by the SLM forming process.The fatigue strength in the X(Y)direction is 28％to 49％greater than in the Z direction under equivalent fatigue life conditions.After hot isostatic pressing treatment at 490 ℃,the difference of fatigue life in two directions is obviously decreased compared to the SLM specimens,which was due to the large size defects was closed after hot isostatic pressing treatment.Moreover,the micro structure coarsening and Si phase coarsening during hot isostatic pressing process led to the decrease of fatigue strength,espe-cially for fatigue tests at high stress level.
关键词
热等静压/激光选区熔化/铝合金/疲劳性能Key words
hot isostatic pressing/selective laser melting/aluminum/fatigue properties引用本文复制引用
基金项目
国家自然科学基金(52105415)
中国科学院青年促进会会员(2022200)
广东省基础与应用基础研究基金(2020B1515120027)
揭榜挂帅项目(2022JH1/10800048)
2023年数字辽宁智造强省(智造强省方向)专项(辽工信投资[2023]171号)
出版年
2024
NETL
NSTL
万方数据