摘要
为了实现激光粉末床熔化技术(Laser Powder Bed Fusion,LPBF)成形钨的裂纹抑制,本研究通过添加铼元素和碳元素,成功制备了W-21Re-C合金,并对其成形性、微观组织和力学性能进行了研究。结果发现,LPBF制备W-21Re-C合金的成形窗口较窄,并存在一定数量的孔洞和裂纹缺陷,但相较于纯钨裂纹有所减少。LPBF成形W-21Re-C合金中形成了大量六方W_(2)C亚结构,在快速凝固的作用下,体系中微纳尺度亚结构呈现为枝晶结构和胞状结构。合金中铼元素主要以固溶形式存在于钨基体中,W_(2)C亚结构的枝晶臂间隙和胞壁处也存在一定的铼元素偏聚。在铼对钨基体固溶强化和W_(2)C胞状结构的共同作用下,LPBF成形W-21Re-C合金的显微硬度显著高于良好LPBF成形的纯钨。
For a reduced cracks in laser powder bed fusion(LPBF)fabricated tungsten,the W-21Re-C alloy was prepared by rhenium and carbon alloying in tungsten matrix.The formability,microstructure and mechanical properties of W-21Re-C alloy were studied.The results showed that the LPBF process parameter window of W-21Re-C alloy was narrow,and there were a certain amount of holes and cracks.The cracks were reduced compared with LPBF pure tungsten.The W_(2)C substructures,with hexagonal close-packed structure,were formed in the LPBFed W-21Re-C alloy.Because of the rapid solidification,the substructures were presented as dendrite and cellular structures.Rhenium in the alloy was mainly presented as forming solid solution in the tungsten matrix.Moreover,there was also a certain amount of rhenium between the dendrite arm as well as at the intracellular region of the W_(2)C substructure.Because of the solid solution of rhenium in tungsten and the formation of W_(2)C substructures,the microhardness of LPBFed W-21Re-C alloy was significantly higher than that of LPBFed pure tungsten.
作者
陈金瀚
赵聪聪
刘伟
CHEN Jinhan;ZHAO Congcong;LIU Wei(School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Jihua Laboratory,Foshan 528000,Guangdong,China)
出处
《中国钨业》
CAS
2022年第3期14-23,共10页
China Tungsten Industry
基金
国家自然科学基金(52001135,51971115)
季华实验室青年创新基金(X201101XG200)。
作者简介
陈金瀚(1995-),男,河北沧州人,博士,主要从事金属材料增材制造研究;通讯作者:赵聪聪(1987-),女,吉林白城人,博士,副研究员,主要从事金属材料增材制造研究。
