张津超,石拓,李刚,史建军,朱刚贤,石世宏,傅戈雁.开放环境下激光内送粉熔覆TC4钛合金的氧化行为[J].表面技术,2020,49(2):243-251.
ZHANG Jin-chao,SHI Tuo,LI Gang,SHI Jian-jun,ZHU Gang-xian,SHI Shi-hong,FU Ge-yan.Oxidation of TC4 Titanium Alloy Processed by Laser inside Powder Feeding Technology in Open Environment[J].Surface Technology,2020,49(2):243-251 |
| 开放环境下激光内送粉熔覆TC4钛合金的氧化行为 |
| Oxidation of TC4 Titanium Alloy Processed by Laser inside Powder Feeding Technology in Open Environment |
| 投稿时间：2019-06-13 修订日期：2020-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.02.030 |
| 中文关键词: 激光熔覆 氧化行为 激光内送粉 TC4钛合金 氩气流量 |
| 英文关键词:laser cladding oxidation laser inside powder feeding TC4 alloy argon gas flow |
| 基金项目:国家重点研发计划（2016YFB1100300）；国家自然科学基金（51675359, 61903268）；江苏省自然科学基金（BK20190823）；中国博士后科学基金（2019M661921） |
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| Author | Institution |
| ZHANG Jin-chao | 1.Soochow University, Suzhou 215021, China |
| SHI Tuo | 1.Soochow University, Suzhou 215021, China |
| LI Gang | 1.Soochow University, Suzhou 215021, China |
| SHI Jian-jun | 2.Nanjing Institute of Technology, Nanjing 210000, China |
| ZHU Gang-xian | 1.Soochow University, Suzhou 215021, China |
| SHI Shi-hong | 1.Soochow University, Suzhou 215021, China |
| FU Ge-yan | 1.Soochow University, Suzhou 215021, China |
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| 中文摘要: |
| 目的 研究开放环境下激光熔覆TC4钛合金的氧化行为。方法 采用激光内送粉熔覆技术制备了不同氩气流量下的TC4钛合金熔覆涂层，通过SEM、EDS和XRD分析了不同氩气流量下涂层氧化层的表面和横截面微观形貌、微观组织、元素分布和物相组成，通过维氏硬度计分析涂层的显微硬度。结果 随着氩气流量的减小，涂层表面颜色逐渐变深，由银白色依次变成黄色、蓝色、深灰色。XRD分析表明，颜色的变化与有色氧化物有关，黄色氧化层主要为黄色TiO，蓝色氧化层主要为蓝色Ti2O3，深灰色氧化层主要为白色TiO2，呈现深灰色与厚的氧化层结构有关。无氩气保护下的涂层表面粗糙，氧化层为厚而疏松多孔结构，与涂层存在缝隙；有氩气保护且随着氩气流量的增加，涂层表面变得光滑，氧化层厚度逐渐减小，致密性好，且与涂层结合良好。随着氩气流量的增加，组织由板条状转变成针状，这主要与冷却速率有关。当涂层颜色为蓝色时，涂层硬度变高，说明氧扩散深度大且氧含量多。结论 在不同的氩气流量下，熔覆涂层表面形成多种不同氧化色。蓝色可作为可接受和不可接受氧化程度的临界颜色。 |
| 英文摘要: |
| The work aims to investigate the oxidation of TC4 titanium alloy processed by laser cladding in open environment. TC4 coatings were prepared with the laser inside powder feeding technology in various argon gas flows. The surface and cross-section morphology, microstructure, elements distribution, phase compositions and microhardness of TC4 coatings were analyzed by SEM, EDS, XRD and Vickers Indenter, respectively. With the decrease of argon gas flow, the surface color of coatings evolved from silvery white to yellow, blue and dark grey. From XRD analysis, the color changes were mainly attributed to the colored titanium oxides. Yellow was caused by yellow TiO, blue was associated with blue Ti2O3, dark grey was white Ti2O3 related to thick oxide structure. In the environment without argon flow, the coating surface was rough and the oxide film was thick and porous and had gap with coating. With the increase of argon gas flow, the coating surface became smooth, and the oxide thickness gradually decreased. The density and the adhesion to the coating were good. The microstructure changed from lath-like structure to needle with the increased argon gas flow, which was related to cooling rate. When the coating was blue, the hardness became higher, indicating that the oxygen diffusion depth was large and the oxygen content was high. The cladding coatings appear brilliant color changes in various argon gas flows and the blue can be regarded as critical color between the acceptable and unacceptable oxidation degree of the oxidized titanium alloy. |
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