激光定向能量沉积15-5PH不锈钢微观组织和性能
Microstructure and Mechanical Properties of Laser-Directed Energy Deposition of 15-5PH Stainless Steel
吴梦园 1杨季鑫 2胡晓圻 2蔡明晖 3农晓东 2王瑞 2毕云杰2
作者信息
- 1. 东北大学材料科学与工程学院,辽宁 沈阳 110819;季华实验室新型增材制造研究院,广东 佛山 528200
- 2. 季华实验室新型增材制造研究院,广东 佛山 528200
- 3. 东北大学材料科学与工程学院,辽宁 沈阳 110819
- 折叠
摘要
采用激光定向能量沉积(L-DED)工艺制备15-5PH马氏体不锈钢,并在不同方向上对其微观组织和性能进行了系统研究.研究结果表明:激光定向能量沉积15-5PH马氏体不锈钢的微观组织由马氏体相和少量奥氏体相组成.成形过程中极快的加热和冷却速率使得沿沉积方向晶粒形貌主要为外延生长的柱状晶;不同区域平行于扫描方向的组织形貌有明显区别,中部区域经历了长时间的热量累积,与顶部和底部相比组织较为粗大.不同成形方向上显微组织的变化导致力学性能呈现各向异性,沿沉积方向和平行于扫描方向的抗拉强度分别为 1000 MPa和 1014 MPa,屈服强度分别为756 MPa和883 MPa,伸长率分别为8.7%和7.4%.
Abstract
This study reports the preparation of 15-5PH martensitic stainless steel via laser-directed energy deposition(L-DED)and systematically analyzes its microstructure and properties in different directions.The research results indicate that the microstructure of 15-5PH martensitic stainless steel fabricated via laser-directed energy deposition is primarily composed of martensitic and a minute amount of austenitic phases.The extremely rapid heating and cooling during the formation process result in columnar grains growing epitaxially along the deposition direction.The microstructures in different regions parallel to the scanning direction differ significantly,with the central region of the sample experiencing prolonged thermal accumulation,thus resulting in coarser microstructures compared with the microstructures in the top and bottom regions.The microstructural variations along different forming directions result in anisotropic mechanical properties,with tensile strengths of 1000 MPa and 1014 MPa,yield strengths of 756 MPa and 883 MPa,and elongations of 8.7%and 7.4%,along the deposition direction and the direction parallel to the scanning direction,respectively.
关键词
激光光学/激光定向能量沉积/15-5PH不锈钢/微观组织演变/力学性能Key words
laser optics/laser-directed energy deposition/15-5PH stainless steel/microstructure evolution/mechanical property引用本文复制引用
出版年
2024
NETL
NSTL
万方数据