摘要
采用光纤激光对GH3536进行了激光选区熔化(SLM)3D打印,对4 mm厚轧制固溶态GH3128(R-GH3128)平板进行了对接焊接研究。利用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射(EBSD)、X射线能谱分析仪(EDS)、显微硬度仪及拉伸试验机对焊缝成形、显微组织、显微硬度、接头强度及断口形貌进行了分析。结果表明,3D-GH3536/R-GH3128的焊缝组织主要为柱状晶和等轴晶,焊缝内直径小于50μm的晶粒数量占比为62.2%。显微硬度测试结果表明,焊缝的平均显微硬度值为286 HV。拉伸试验结果表明,接头上下部分的抗拉强度基本一致,约为3D-GH3536母材的93%,断裂方式为韧性断裂。
Objective GH3536 is a nickel-base superalloy with outstanding oxidation resistance. It has good metallurgical properties and forming ability. For the 3D printing process superalloy, it has become the preferred material of choice. Rolled solid solution GH3128(R-GH3128) has the benefits of strong corrosion resistance, oxidation resistance, and high fatigue strength. The two materials are extensively employed in the manufacture of high-temperature parts in the aerospace field. 3D printing can rapidly and accurately prepare complex geometric structures, which are challenging to achieve by traditional forging, casting, and other approaches. However, because of the travel limitations of printing equipment, the size of parts manufactured using the 3D printing process is restricted, which is challenging to meet the demands of largesize precision components manufacturing in the aerospace field. Laser welding technology has the benefits of small heat input, and adjustable beam transformation and being implemented in the atmospheric environment. It has developed into a crucial superalloy connection technology. In this study, the butt welding process test is conducted, the impact of fiber laser welding parameters on the weld morphology is investigated, and the structure and properties of the 3D-GH3536/RGH3128 joint are examined.Methods The welding equipment uses a fiber laser, with a wavelength of 1060--1070 nm and a transmission fiber core diameter of 200 μm. The collimator’s focal length is 200 mm, the focusing lens’ focal length is 300 mm, and the focal spot diameter is 0.3 mm. The test materials are 3D printed GH3536 and rolled solid solution GH3128 flat plates, and the specification of the butt sample is 60 mm×40 mm×4 mm. In the welding process, the laser beam is incident perpendicular to the plate surface, and the focus is on the plate’s upper surface. The argon lateral protection is used. The circular nozzle’s inner diameter is 10 mm, the gas flow is 10 L/min, the included angle between the protective gas n
作者
程智伟
祁百鑫
张桐
袁振飞
杜欣
武强
肖荣诗
Cheng Zhiwei;Qi Baixin;Zhang Tong;Yuan Zhenfei;Du Xin;Wu Qiang;Xiao Rongshi(Intelligent Photonic Manufacturing Research Center,Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2022年第22期150-158,共9页
Chinese Journal of Lasers
基金
国家自然科学基金面上项目(51775009)。
