TiAl合金的激光气相氮化  

Laser Gaseous Nitriding of TiAl Alloy

作　　者：汪洪海[1,2] 郑启光[1,2] 辜建辉 王涛[1,2] 何秀丽 王华明[1,2] 

机构地区：[1]华中理工大学激光技术国家重点实验室 [2]北京航空航天大学

出　　处：《中国激光》1998年第10期955-960,共6页Chinese Journal of Lasers

摘　　要：使用激光气相合金化方法，氮气气氛下在铝钛合金表面进行氮化处理。结果发现：氮化层由ＴｉＮ和ＴｉＡｌ相构成，ＴｉＮ以枝晶形式在氮化层均匀分布。材料横截面显微硬度连续变化。氮化程度随作用时间的增加而增加，辐照的激光能量密度越高，氮化层的厚度越大。当激光功率密度、扫描速度、氮气喷射压强分别为３．３５×１０５Ｗ·ｃｍ－２，３００ｍｍ·ｍｉｎ－１，０．３５ＭＰａ时，表面显微硬度为ＨＶ７００，氮化层的厚度达到２００μｍ。比较表明，相同条件时，铝钛合金的氮化程度和氮化层厚度均小于金属钛。The surface of TiAl alloy is nitrided by CO 2 laser gaseous alloying with nitrogen. The experimental result shows that the nitrided layer consists of TiN and TiAl phases. Dendrite TiN distributes in the nitrided zone homogeneously. The cross section micro hardness of the material changes continuously. The nitriding level increased with the reaction time increasing. The higher laser energy density, the deeper nitrided layers. The depth of the nitrided layer and the surface micro hardness are 200 μm and HV700 as laser power density of 3.35×10 5 W·cm -2 , scanning velocity of 300 mm·min -1 , and nitrogen pressure of 0.35 MPa are used. Under the same experimental conditions, the nitriding level and the depth of the nitrided zone of TiAl alloy are lower than those of titanium.

关 键 词：激光气相合金化 铝钛合金 氮化钛 

分 类 号：TG174.445[金属学及工艺—金属表面处理] TG146.2[金属学及工艺—金属学]