激光粉末床熔融M2052合金成形特性及组织性能研究  

Research on the Forming Characteristics,Microstructure and Properties of M2052 Alloy via Laser Powder Bed Fusion

作　　者：彭艺杰 周凡 冯恩昊 范伟 冯喆[1,2] 党铭吉 谭华[1,2] 张凤英 林鑫[1,2] PENG Yijie;ZHOU Fan;FENG Enhao;FAN Wei;FENG Zhe;DANG Mingji;TAN Hua;ZHANG Fengying;LIN Xin(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design,Northwestern Polytechnical University,Xi'an 710072,China;School of Material Science and Engineering,Chang'an University,Xi'an 710064,China)

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072 [2]西北工业大学高性能金属增材制造工信部重点实验室,陕西西安710072 [3]长安大学材料科学与工程学院,陕西西安710064

出　　处：《铸造技术》2024年第8期772-782,共11页Foundry Technology

基　　金：国家重点研发计划(2022YFB4600300、2022YFB4600301);西工大特色学科基础研究项目(G2022WD);国家自然科学基金(52175364);凝固技术国家重点实验室自主研究课题(2023-QZ-04)。

摘　　要：M2052合金能够吸收外部振动能量,实现对机械系统减振降噪。利用激光粉末床熔融制备M2052合金有望满足航空航天精密设备的服役需求。本研究系统探究了M2052合金的基础成形工艺特性,揭示其缺陷形成原因,分析其显微组织和物相组成并在此基础上对拉伸性能进行评价。结果表明,激光粉末床熔融M2052合金成形工艺窗口极窄,欠熔合的产生归因于激光输入能量不足,裂纹的产生与不当的工艺参数组合有关。沉积态合金呈现出精细的胞状枝晶微观结构及柱状晶生长趋势,具有明显的[100]晶粒取向,并形成了单一γ-(Mn,Cu)固溶体。室温拉伸的屈服强度为(345±5)MPa、抗拉强度为(404±2)MPa、伸长率为5.21%±0.57%,表现出脆性断裂特征,大量微裂纹和孔洞形成是M2052合金脆性断裂的主要原因。M2052 alloys can absorb external vibrational energy,thereby reducing machine system vibration and noise.The utilization of laser powder bed fusion for the preparation of M2052 alloys holds promise for meeting the service requirements of aerospace precision equipment.The fundamental forming process characteristics of the M2052 alloy were systematically investigated,the factors leading to defect formation were explained,and the microstructure and phase composition of the M2052 alloy were analysed.An evaluation of the tensile properties was then conducted on the basis of these findings.These results indicate that the process window for the laser powder bed fusion of the M2052 alloy is exceedingly narrow.A lack of fusion occurs because of insufficient laser input energy,whereas the occurrence of cracks is attributed to inappropriate parameter combinations.The as-deposited alloy displays fine cellular dendrites,along with a trend of columnar crystal growth,exhibiting a pronounced[100]grain orientation and forming a singleγ-(Mn,Cu)solid solution phase.The yield strength is(345±5)MPa,the ultimate tensile strength is(404±2)MPa,and the elongation is 5.21%±0.57%at room temperature,demonstrating characteristics of brittle fracture.The primary reasons for M2052 alloy brittle fracture are the formation of numerous microcracks and holes.

关 键 词：激光粉末床熔融 Mn-Cu合金 微观组织 力学性能 

分 类 号：TG145[一般工业技术—材料科学与工程]