摘要
孔隙缺陷对SLM成形件的性能与可靠性有重大影响,现有孔隙演变研究主要从成形过程监测与成形结果分析两方面分离进行。本文提出一种成形过程监测与成形结果检测融合驱动的SLM孔隙随层厚演变研究新方法,获取GH4169合金SLM成形凝固的可见光监测图像与SLM成形件的CT检测图像,选取特定区域孔隙并提取特征参数,表征并分析两种图像中孔隙特征参数随层厚的变化。结果表明,CT图像孔隙特征参数随层厚变化较可见光图像有滞后;孔隙形成的前半部分,第N+1层的成形对第N(或及以下)层孔隙具有缩小作用,后半部分具有扩大作用;第N+1层的成形具有减小第N(或及以下)层孔隙圆度的作用。结论有待进一步验证,但为SLM成形缺陷随层厚演变的研究提供了一种新思路,后续将继续深入研究。
Pore defects have a significant impact on the performance and reliability of SLM(selective laser melting)formed parts.The previous pore evolution research is separately carried out from two aspects:the monitoring of the forming process and the analysis of the forming results.In this paper,a new method for studying the evolution of SLM pores with layer thickness driven by the fusion of forming process monitoring and forming result detection was proposed.By obtaining visible light monitoring images of GH4169 alloy SLM forming solidification and CT detection images of SLM formed parts,specific areas of a pore were selected and the feature parameters were extracted.Then,the changes in pore feature parameters with layer thickness in both images were characterized and analysed.The results show that the variation of pore characteristic parameters in CT images with layer thickness lags behind that in visible light images.In the first half of pore formation,the formation of the N+1 layer has a shrinking effect on the pores of the N(or below)layer,and the latter half has an expanding effect.The formation of the N+1 layer has the effect of reducing the roundness of the pores in the N(or below)layer.Since only specific pores have been studied,the conclusions need to be further verified.But this work provides a new way to study the evolution of SLM forming defects with layer thickness,which will be further studied in the future.
作者
周圣智
涂先猛
计效园
陈嘉龙
杨欢庆
王泽明
彭东剑
李宁
周建新
高亮
ZHOU Shengzhi;TU Xianmeng;JI Xiaoyuan;CHEN Jialong;YANG Huanqing;WANG Zeming;PENG Dongjian;LI Ning;ZHOU Jianxin;GAO Liang(State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Xi'an Space Engine Factory,Xi'an 710100,China;School of Mechanical Science&Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《铸造技术》
CAS
2023年第7期640-648,共9页
Foundry Technology
基金
国家重点研发计划(2020YFB1710100)
KGW资助项目(2019XXX.XX4007Tm)
国家自然科学基金(52275337、51905188、52090042)。
