汽轮机304L空心静叶片3D打印研制  

Study on 3D Printing of 304L Hollow Stationary Blades in Steam Turbine

作　　者：梅林波 王煜 张红梅 MEI Linbo;WANG Yu;ZHANG Hongmei(Shanghai Electric Power Station Equipment Co.,Ltd.Turbine Plant,Shanghai 200240,China)

机构地区：[1]上海电气电站设备有限公司汽轮机厂,上海200240

出　　处：《热力透平》2021年第2期126-130,共5页Thermal Turbine

摘　　要：采用激光选区熔化(SLM)技术制备了304L不锈钢空心静叶片。通过化学成分分析、拉伸试验、金相观察、致密度测试、PT检验等方法,对3D打印空心静叶片和随炉试棒进行评估。结果表明:4个打印区域随炉试棒的化学成分均满足304L材料的技术要求。随炉试棒沉积方向的屈服强度低于水平方向,表现出明显的各向异性。4个打印区域随炉试棒的金相组织观察到少量的细小未熔合缺陷。打印的空心静叶片和随炉试棒的致密度均在98%以上。对空心静叶片进行PT检验,在叶片内弧面和外弧面均未发现明显缺陷。研制的136支3D打印304L空心静叶片,其各项指标均能够满足相关技术要求,已成功应用于垃圾焚烧发电机组,获得了良好的经济与社会效益。The hollow stationary blades of 304L stainless steel were prepared by selective laser melting(SLM)technology.Through different methods such as chemical composition analysis,tensile test,metallographic observation,density test and PT inspection,the 3D printing hollow stationary blades and test bars were evaluated.The results showed that the chemical composition of the test bars in 4 printed areas could meet the technical requirements of 304L material.The yield strength of the test bar in the direction of deposition was lower than that of the horizontal direction,which showed obvious anisotropy.A few small-size unfused defects were observed in the metallographic structure of the test bars in 4 printed areas.The density of the test bars and the printed hollow stationary blade was above 98%.The PT inspection of the printed hollow stationary blades showed that there was no obvious defect on the inner and outer arc surfaces of the blade.The developed 1363D printed 304L hollow stationary blades can meet the relevant technical requirements and have been successfully applied to waste incineration power generation units,with satisfying economic and social benefits being obtained.

关 键 词：3D打印 激光选区熔化 304L 空心静叶片 

分 类 号：TK266[动力工程及工程热物理—动力机械及工程]