航空学报 > 2023, Vol. 44 Issue (19): 428332-428332   doi: 10.7527/S1000-6893.2023.28332

激光选区熔化成形GH5188合金微观组织及性能

赵楠1, 李多生1(), 叶寅1, 刘奋成2, 江五贵2   

  1. 1.南昌航空大学 材料科学与工程学院,南昌  330063
    2.南昌航空大学 航空与制造工程学院,南昌  330063
  • 收稿日期:2022-11-29 修回日期:2022-12-19 接受日期:2023-03-07 出版日期:2023-10-15 发布日期:2023-03-17
  • 通讯作者: 李多生 E-mail:ldscad@163.com
  • 基金资助:
    国家自然科学基金(51562027);江西省重点研发计划重点项目(20201BBE51001);江西省省级优势科技创新重点团队项目(20181BCB24007);江苏省重点研发计划(产业前瞻与关键核心技术)(BE2021055)

Microstructure and properties of GH5188 alloy fabricated by selective laser melting

Nan ZHAO1, Duosheng LI1(), Yin YE1, Fencheng LIU2, Wugui JIANG2   

  1. 1.School of Material Science and Engineering,Nanchang Hongkong University,Nanchang  330063,China
    2.School of Aeronautical and Manufacturing Engineering,Nanchang Hongkong University,Nanchang  330063,China
  • Received:2022-11-29 Revised:2022-12-19 Accepted:2023-03-07 Online:2023-10-15 Published:2023-03-17
  • Contact: Duosheng LI E-mail:ldscad@163.com
  • Supported by:
    National Natural Science Foundation of China(51562027);Key Research and Development Program of Jiangxi Province(20201BBE51001);Provincial Superior Science and Technology Innovation Key Team of Jiangxi Province(20181BCB24007);Key Research and Development Program of Jiangsu Province (Industrial Foresight and Key Core Technologies)(BE2021055)

摘要:

采用激光选区熔化(SLM)工艺成形GH5188合金,研究激光功率、扫描速度、扫描间距和层间转角等制备参数对成形质量的影响,并进行了力学性能和微观组织分析。结果表明:激光功率为200 W、扫描速度为800 mm/s、扫描间距为0.08 mm、层间转角为45°时成形试样内部组织均匀性优于表面、顶面质量优于侧面。基体组织形貌受熔池熔道影响,细晶分布在熔道边缘,晶粒内存在细小亚晶(粒径为1~2 μm)和长条状析出碳化物M23C6/M6C(长约50 nm、宽约10 nm),碳化物颗粒弥散分布于基体中,亚晶阻碍位错运动及碳化物对位错具有钉扎作用,强化了GH5188合金的力学性能。该工艺参数下试样致密度可达98.75%,硬度达296.71 HV,抗拉强度为1 048.38 MPa,硬度和抗拉性能大于热轧板,延伸率为11.7%,低于热轧板,SLM成形的GH5188合金呈现较好的力学性能。

关键词: GH5188高温合金, SLM, 成形质量, 力学性能, 微观组织

Abstract:

The effects of laser power, scanning speed, scanning distance and interlayer angle on the forming quality of GH5188 alloy were investigated by Selective Laser Melting (SLM) process. The microstructure and mechanical properties were analyzed. The results show that when the laser power is 300 W, the scanning speed is 800 mm/s, the scanning spacing is 0.08 mm, and the print direction angle between layers is 45°, the internal microstructure of the formed sample is better than the surface, and the quality of the top surface is better than that of the side surface. The microstructure of the alloy is affected by the weld channel and molten pool, and the fine crystals are distributed on the edge of the weld channel. There are fine subcrystals (diameter is 1–2 μm) and long strip precipitation carbide M23C6/M6C (about 50 nm long and 10 nm wide) in the grains, and the carbide particles are uniformly dispersed in the matrix. The movement of dislocation was hindered by the subcrystals, and the carbides have pinning effect on dislocation, strengthening the mechanical properties of GH5188 alloy. Under the process parameters, the density of GH5188 alloy increased to 98.75%, the hardness is 296.71 HV, and the tensile strength is 1 048.38 MPa. The hardness and tensile properties of the sample are higher than that of the hot rolled plate, and the elongation is 11.7%, which is lower than that of the hot rolled plate. GH5188 alloy fabricated by SLM has good mechanical properties.

Key words: GH5188 superalloy, SLM, quality, mechanical properties, microstructure

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