摘要
采用激光熔覆技术,通过层层堆积TC4钛合金粉,对TC4钛合金板表面凹槽进行修复。采用光学显微镜表征了不同激光功率、扫描速度和搭接率下TC4钛合金熔覆件的微观结构。采用夏比冲击试验和数理统计方法,分析了激光熔覆再制造技术对TC4钛合金冲击韧性的影响。采用扫描电镜观测了夏比冲击试样的断口形貌。结果表明:激光修复区组织为粗大原始β晶粒内分布细长的α针及编织状α+β板条组织,呈现典型的魏氏结构;而热影响区主要由等轴的α晶粒和β转变组织组成,属于典型的双态结构。同TC4母材相比,激光熔覆再制造件的夏比冲击功提高了18.97%。
Based on laser cladding technology, the surface groove of TC4 titanium alloy plate was repaired by adding TC4 titanium power layer by layer. The microstructure of TC4 laser cladding samples produced under different laser powers, scanning speeds and overlapping rates was characterized by optical microscopy.The effects of laser cladding remanufaeturing technology on the impact toughness of TC4 titanium were analyzed by Charpy impact test and mathematic statics method. The fracture appearance of Charpy impact samples was observed by scanning electron microscopy. The results indicate that the laser-repaired zone exhibits the typical widmanstatten structure consisting of prior huge columnar 13 grains. There are fine acicular ct and interlaced a＋13 lath structure in the 13 grains. The heat affected zone is composed of equiaxed ct grains and 13 transformed microstrucalre, which belongs to typical two-state structure. Compared with TC4 matrix, the Charpy impact energy of the laser cladding remanufactured sample increases by 18.97%.
作者
葛茂忠
项建云
杨晓红
GE Maozhong XIANG Jianyun YANG Xiaohong(School of Materials Engineering. Jiangsu University of Technology, Changzhou 213001, China Mechanic Department, Changzhou Institute of Light Industry Technology, Changzhou 213164, China)
出处
《热加工工艺》
CSCD
北大核心
2017年第20期178-182,186,共6页
Hot Working Technology
基金
江苏省自然科学基金面上项目(BK20151171)
