多次激光冲击Ti-6Al-4V钛合金表面纳米化研究

杨进德; 周王凡; 杨涛; 刘帆帆; 任旭东

doi:doi:10.7510/jgjs.issn.1001-3806.2017.05.027

激光技术, 2017, 41 (5): 754, 网络出版: 2017-09-21

多次激光冲击Ti-6Al-4V钛合金表面纳米化研究

Nanocrystallization of Ti-6Al-4V alloy by multiple laser shock processing

论文大纲

杨进德周王凡杨涛刘帆帆任旭东 ^*

作者单位

江苏大学机械工程学院, 镇江 212013

激光技术纳米晶 Ti-6Al-4V钛合金微观结构硬度 laser technique nanocrystals Ti-6Al-4V titanium alloy microstructure hardness

摘要

为了研究激光冲击Ti-6Al-4V钛合金下的表面纳米化和微观结构的演变特性, 采用短脉冲Nd∶YAG激光器对Ti-6Al-4V钛合金表面分别进行了激光冲击实验, 得到了不同激光冲击次数下钛合金表面的微观组织和相应表面硬度。随着激光冲击次数增加, 晶粒尺寸逐渐减小并形成纳米晶粒; 冲击3次以上时, 纳米晶数量明显增多、尺寸分布更加均匀, 表面出现取向更加随机的等轴纳米晶; 冲击5次后, 随着冲击次数增加, 钛合金表面纳米晶粒尺寸没有出现明显降低的趋势, 始终保持50nm~130nm; 不同冲击次数下纳米层的深度不会明显增加, 纳米层深度约为15μm~20μm; 冲击次数5次以上后, 钛合金表面硬度趋于稳定, 最大值约为525HV~530HV。结果表明, Ti-6Al-4V钛合金表面纳米化程度随着激光冲击次数的增加而提高; 在5次激光冲击后钛合金表面的纳米化程度达到渐饱和状态, 表面具有分布较好的纳米晶和较高的硬度。这表明多次激光冲击钛合金表面可以实现晶粒从微米级向纳米级转化。

Abstract

In order to study the surface nanocrystallization and microstructure evolution of Ti-6Al-4V alloy, the samples of Ti-6Al-4V alloy were peened with different times by using short-pulse Nd∶YAG laser, the corresponding surface microstructure and microhardness were obtained. With the increase of the number of laser impact, the grain size gradually decreased and nanocrystals were formed. After more than three impacts, the number of nanocrystals obviously increased with a more uniform size distribution and the orientation of equiaxed nanocrystals on the surface became more random. After more than 5 times of laser impacts, the nanocrystalline grain size of Ti-6Al-4V titanium alloy did not decrease significantly with the increase of the number of laser impacts, and maintained at 50nm~130nm. The depth of the nanostructure layer was not increased obviously and was about 15μm~20μm. After more than 5 times of laser impacts, the titanium alloy surface hardness tended to be stable, and the maximum hardness was about 525HV~530HV. The results show that the nanocrystallization degree of Ti-6Al-4V titanium alloy improves with the increase of the number of laser impacts. After five impacts, the nanocrystallization of the titanium alloy surface is saturated. The surface has a better nanocrystalline distribution and higher hardness. The study indicates that the surface of titanium alloy through multiple laser impacts can prompt the grain size transformation from micron to nanometer.

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杨进德, 周王凡, 杨涛, 刘帆帆, 任旭东. 多次激光冲击Ti-6Al-4V钛合金表面纳米化研究[J]. 激光技术, 2017, 41(5): 754. YANG Jinde, ZHOU Wangfan, YANG Tao, LIU Fanfan, REN Xudong. Nanocrystallization of Ti-6Al-4V alloy by multiple laser shock processing[J]. Laser Technology, 2017, 41(5): 754.

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