李艳丽,魏继业,马亚鑫,等.扫描速度对激光选区熔化成形304L不锈钢板材高温持久性能的影响[J].精密成形工程,2022,14(9):111-118.
LI Yan-li,WEI Ji-ye,MA Ya-xin,et al.Effect of Scanning Speed on High Temperature Durability Performance of 304L Stainless Steel by Selective Laser Melting[J].Journal of Netshape Forming Engineering,2022,14(9):111-118. |
| 扫描速度对激光选区熔化成形304L不锈钢板材高温持久性能的影响 |
| Effect of Scanning Speed on High Temperature Durability Performance of 304L Stainless Steel by Selective Laser Melting |
| |
| DOI：10.3969/j.issn.1674-6457.2022.09.016 |
| 中文关键词: 激光选区熔化 304L不锈钢 微观组织 高温持久性能 |
| 英文关键词: selective laser melting 304L stainless steel microstructure high-temperature durability |
| 基金项目:四川省科技计划重点研发项目(2022YFG0214);四川省市场监督管理局科技计划(SCSJS2022021) |
|
| 摘要点击次数: 1156 |
| 全文下载次数: 415 |
| 中文摘要: |
| 目的 以激光选区熔化(SLM)成形304L不锈钢为对象，研究激光扫描速度对其组织及性能的影响，为优化304L不锈钢成形参数提供试验依据。方法 采用单因素试验研究了扫描速度对304L不锈钢微观组织、孔隙率、相对致密度、硬度、持久寿命等性能的影响，得到了304L不锈钢SLM成形相对最佳工艺参数。结果 当激光功率为300 W、扫描间距为0.1 mm、层厚为0.03 mm时，SLM成形304L不锈钢的最优扫描速度为1 000 mm/s，在此参数下试样持久时间为62.5 h，相对密度为99.5%，室温洛氏硬度为91.3HRB，700 ℃下维氏硬度为126.2HV。结论 在最优成形条件下，显微胞状结构组织均匀致密且气孔较少，熔池边界细小晶粒取向基本随机，熔池内偏大的柱状晶取向沿着<001>方向有一定的择优性，具有弱织构特征;相主要由奥氏体组成，持久断口呈灰黑色，无明显的颈缩现象，断口呈现锯齿状起伏滑移，并伴有明显的撕裂特征，断口为韧性撕裂断口。 |
| 英文摘要: |
| The work aims to study the effect of laser scanning speed on the microstructure and properties of 304L stainless steel formed by laser selective melting (SLM), so as to provide experimental basis for optimizing the forming parameters of 304L stainless steel. The effect of scanning speed on the microstructure, porosity, relative density, hardness, and durability of 304L stainless steel was studied through single-factor experiments, and the optimum forming process parameters of 304L stainless steel was obtained. When the laser power was 300 W, the scanning distance was 0.1 mm, and the layer thickness was 0.03 mm, the optimal scanning speed of SLM forming 304L stainless steel was 1 000 mm/s. Under these parameters, the sample duration was 62.5 h, the relative density was 99.5%, the Rockwell hardness at room temperature was 91.3HRB, and the Vickers hardness at 700 ℃ was 126.2HV. Under the optimal forming conditions, the microscopic cellular structure is uniform and dense with few pores, the orientation of the fine grains at the boundary of the molten pool is basically random, and the orientation of the larger columnar crystals has a certain preference along <001>, with weak texture characteristics. The phase is mainly composed of austenite, the permanent fracture is gray-black without obvious necking and the fracture shows zigzag undulating slip, accompanied by obvious tearing characteristics, which is a ductile tear fracture. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501719号