激光金属直接成形DZ125L高温合金零件工艺的研究_葛江波.pdfVIP

38 7 Vol. 38, No. 7 2011 7 CHINESE JOURNAL OF LASERS July, 2011 激光金属直接成形DZ125L 高温 合金零件工艺的研究 葛江波 张安峰 李涤尘 朱刚贤 路桥潘 贺 斌 鲁中良 ( , 7 10054) , DZ125L , ( LMDF) , ( Z ) , , , 3 , , , , ; ; DZ 125L ; ; ; T F 124; T N249 A doi: 10. 3788/ CJL20 1138. 0703004 Process Research on DZ125L Superalloy Parts by Laser Metal Direct Forming Ge Jiangbo Zhang Anfeng Li Dichen Zhu Gangxian Lu iaopan He Bin Lu Zhongliang ( Stat K y Labor at ory f or Man uf actu rin g S yst m s En gin ring , Xic an Jiaoton g Univ rsity , Xican , Shaan x i 710054, China ) Abstract In order to obtain smooth surface of thin-walled parts, single-trace cladding experiments are carried out for DZ125L superalloy by laser metal direct forming (LMDF) technology using different combinations of process parameters. Influence ofthe process parameters (such aslaser power, scanning velocity, powder massflow rate and Z-increment ) on height, width, aspect ratio and forming quality of single-trace cladding layer is studied systematically, by which the process parameters are optimized. In order to characterize geometrical features of single-trace cladding layer, a new method of three-dimensional (3D) characterization of energy density is proposed andthe corresponding formulas are derived. From aspect ratio, dilution rate and energy density, the matching relationship between good cladding layer and its process parameters is clarified, which provides the foundations for further research into determining the process parameters according to d