当前位置:主页 > 科技论文 > 铸造论文 >

强流脉冲电子束作用下纯钛的微观组织结构变化及其性能研究

发布时间:2019-03-02 11:35
【摘要】:目的提高纯钛表面的耐腐蚀性能。方法本实验主要分两步进行,首先进行金相样品的制备,然后利用强流脉冲电子束对材料表面进行改性处理,最后利用扫描电镜(SEM)、X射线衍射仪(XRD)、硬度检测,电化学检测等检测手段进行探讨研究。结果扫描电镜分析结果表明,强流脉冲电子束处理后,样品表面出现了熔坑,并且随着脉冲次数的增加,熔坑数量逐渐减少,这主要归因于强流脉冲电子束的净化除杂作用。X射线衍射分析发现,强流脉冲电子束处理后,衍射峰出现了宽化和向高角度偏移现象,主要归因于脉冲处理后合金表面的晶粒细化和表面应力、晶格常数的降低。另外,电化学测试表明,强流脉冲电子束处理后金属表面的耐腐蚀性明显增加,自腐蚀电流密度从强流脉冲电子束处理前的27.3μA/cm~2变化到25次脉冲处理后的6.3μA/cm~2,主要归因于强流脉冲电子束的净化除杂作用以及熔坑等结构缺陷的消失。显微硬度分析发现,经过强流脉冲电子束处理后由于样品表面的残余应力和孪晶等结构缺陷的存在,样品表面硬度明显降低。结论强流脉冲电子束处理后,纯钛的耐腐蚀性能增加,晶粒细化,硬度有所降低。
[Abstract]:Objective to improve the corrosion resistance of pure titanium surface. Methods the experiment was carried out in two steps. Firstly, the metallographic sample was prepared, then the surface of the material was modified by high current pulsed electron beam. Finally, the hardness of the material was measured by (SEM), X-ray diffractometer (XRD),) with scanning electron microscope (SEM). Electrochemical detection and other detection methods were discussed. Results the results of SEM analysis showed that after high current pulsed electron beam treatment, the weld pits appeared on the surface of the samples, and with the increase of pulse times, the number of craters decreased gradually. X-ray diffraction analysis shows that the diffraction peak is broadened and shifted to high angle after high-current pulsed electron beam treatment, and X-ray diffraction analysis shows that the high-current pulsed electron beam can be used to remove the impurity by high-current pulsed electron beam. It is mainly due to the grain refinement and surface stress and the decrease of lattice constant on the surface of the alloy after pulse treatment. In addition, electrochemical tests showed that the corrosion resistance of the metal surface was significantly increased after high current pulsed electron beam treatment, and the self corrosion current density changed from 27.3 渭 A / cm~2 before high current pulsed electron beam treatment to 6.3 渭 A / cm~2, after 25 times pulsed electron beam treatment. It is mainly due to the removal of impurity by high-current pulsed electron beam and the disappearance of structural defects such as melting pits. Microhardness analysis shows that after high current pulsed electron beam treatment, the surface hardness of samples decreases obviously due to the presence of structural defects such as residual stress and twinning on the sample surface. Conclusion after high current pulsed electron beam treatment, the corrosion resistance of pure titanium increases, the grain size is refined and the hardness is decreased.
【作者单位】: 东北大学冶金学院;
【基金】:国家自然科学基金(51671052)~~
【分类号】:TG146.23

【相似文献】

相关期刊论文 前10条

1 史克勤,张路,李忠英;辐射加工用电子束能量的测量[J];计量技术;1994年03期

2 宇野┬,

本文编号:2433009


资料下载
论文发表

本文链接:https://www.wllwen.com/kejilunwen/jiagonggongyi/2433009.html


Copyright(c)文论论文网All Rights Reserved | 网站地图 |

版权申明:资料由用户2fc39***提供,本站仅收录摘要或目录,作者需要删除请E-mail邮箱bigeng88@qq.com