东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (10): 104-112.DOI: 10.12068/j.issn.1005-3026.2025.20240013

• 材料与冶金 • 上一篇    

金属熔丝成型17-4PH制品尺寸收缩理论与实验研究

姜世杰1,2, 王菲1, 李曙光1, 许子沼1   

  1. 1.东北大学 机械工程与自动化学院,辽宁 沈阳 110819
    2.辽宁省机械装备动力学可靠性重点实验室,辽宁 沈阳 110819
  • 收稿日期:2024-01-12 出版日期:2025-10-15 发布日期:2026-01-13
  • 作者简介:姜世杰(1985—),男,辽宁营口人,东北大学副教授.
  • 基金资助:
    国家自然科学基金资助项目(52475093);中央高校基本科研业务费专项资金资助项目(N2303019)

Theoretical and Experimental Research on Dimensional Shrinkage of MFFF 17-4PH Products

Shi-jie JIANG1,2, Fei WANG1, Shu-guang LI1, Zi-zhao XU1   

  1. 1.School of Mechanical Engineering & Automation,Northeastern University,Shenyang 110819,China
    2.Key Laboratory of Dynamics Reliability of Mechanical Equipment,Liaoning Province,Shenyang 110819,China. Corresponding author: LI Shu-guang,E-mail: lishuguang334@163. com
  • Received:2024-01-12 Online:2025-10-15 Published:2026-01-13

摘要:

金属熔丝成型(metal fused filament fabrication, MFFF)样件尺寸在脱脂/烧结过程中会明显收缩,影响成型精度和实际应用.为明确收缩机理以提出有效的解决措施,首先建立了烧结样件尺寸收缩率的理论模型,完成尺寸变化过程的理论解析;然后,成型17-4PH不锈钢烧结样件并使用扫描电子显微镜确定其截面的微观结构;对比分析理论与实验结果,验证模型的正确性;最后,分析模型的敏感性,讨论了烧结升温速率、最高温度保持时间、生坯样件表观密度对MFFF样件尺寸收缩率的影响规律.结果表明,样件的尺寸收缩率呈各向异性特点(竖直方向略大于水平方向);生坯样件表观密度对烧结样件尺寸收缩率的影响最为显著,其次是烧结升温速率和最高温度保持时间.

关键词: 金属熔丝成型, 尺寸收缩率, 17-4PH不锈钢, 理论解析, 实验研究

Abstract:

The dimensional shrinkage of the green sample treated by metal fused filament fabrication (MFFF) occurs during debinding/sintering process, affecting the forming accuracy and practical application. In order to clarify the shrinkage mechanism and put forward effective solutions, a theoretical model of the dimensional shrinkage rate of sintered samples was first established, and the dimensional changing process was theoretically analyzed. Then, a sintered sample of 17-4PH stainless steel was formed, and the microstructure of its cross-section was determined using scanning electron microscope (SEM). Through the comparison between the theoretical and experimental results, the correctness of the proposed model was verified. Finally, the sensitivity of the model was analyzed, and the influence of the sintering temperature rise rate, maximum temperature holding time, and apparent density of the green sample on the dimensional shrinkage rate of MFFF samples was discussed. The results show that the dimensional shrinkage rate of the samples is anisotropic (the one in the vertical direction is slightly larger than that in the horizontal direction). The apparent density of the green sample has the most significant effect on the dimensional shrinkage rate of the sintered samples, followed by the sintering temperature rise rate and maximum temperature holding time.

Key words: metal fused filament fabrication(MFFF), dimensional shrinkage rate, 17-4PH stainless steel, theoretical analysis, experimental research

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